CN107131978B - Calibration device and calibration method for commercial circulating heat pump water heater testing device - Google Patents
Calibration device and calibration method for commercial circulating heat pump water heater testing device Download PDFInfo
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- CN107131978B CN107131978B CN201710442681.0A CN201710442681A CN107131978B CN 107131978 B CN107131978 B CN 107131978B CN 201710442681 A CN201710442681 A CN 201710442681A CN 107131978 B CN107131978 B CN 107131978B
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Abstract
The invention relates to a calibration device and a calibration method of a commercial circulating heat pump water heater testing device, wherein the calibration device comprises: the device comprises a calibration water tank, heating equipment, a temperature acquisition module, a power test module and a control module; the calibration method comprises the following steps: firstly, obtaining the heat leakage coefficient of the calibration device and the heating efficiency of the heating equipment, then connecting the calibration device to the testing device instead of the tested machine, testing at the preset environment temperature and the circulating water flow of the water pump of the preset testing device to obtain the heating quantity of the calibration device, and further obtaining the heat leakage quantity of the testing device. Compared with the prior art, the calibration device provided by the invention has the beneficial effects that: 1) The heat leakage quantity of the calibration device can be tested; 2) An actual working condition operation curve can be fitted; 3) The heating power can be adjusted; the calibration method can accurately and dynamically calibrate the heat leakage quantity of the existing test method/test device, so that a laboratory can accurately test the heating quantity of the heat pump.
Description
Technical Field
The invention relates to a calibration device and a calibration method of a commercial circulating heat pump water heater testing device, which are mainly used for calibrating the commercial circulating heat pump water heater testing device and belong to the technical field of air conditioners and heat pumps.
Background
A heat pump water heater is similar to an air conditioner except that the heat transfer medium is water and absorbs heat from a condenser of the refrigeration system to obtain hot water. The test principle of the heat pump water heater is that the heating quantity of the heat pump water heater is calculated by testing the heating water quantity and the heating time of the heat pump water heater to be tested. Heat pump water heaters are divided into four categories: primary heating, commercial cycle heating, domestic cycle heating, and domestic static heating. The current test method of the commercial circulating heat pump water heater specified in the standard GB/T21362-2008 is to simulate a user water tank by using a standard water tank, connect the standard water tank with a tested machine through a pipeline and a water pump, test the average temperature of 8 platinum resistors arranged in the standard water tank as the test water temperature, and because the temperature is not measured at an inlet and an outlet of the tested machine, the standard requires that the heat leakage and the heat accumulation of the water tank are added on the basis of the measured heating capacity to be used as the final heating capacity of the commercial circulating heat pump water heater. Therefore, in order to obtain the heating capacity of the heat pump water heater more accurately, a calibration device (also called a checking device and a checking device) is required to calibrate the testing device to obtain the heat leakage capacity of the testing device.
The principle of a calibration method of a commercial circulating heat pump water heater testing device specified in the current standard GB/T21362-2008 is shown in figure 1, in order to check the heat leakage of the testing device, a calibration device 12 is used for replacing a tested machine to be connected into a pipeline for testing, 8 is a water pump, 10 is a standard water tank, and 13 is a thermometer; the calibration device is connected with a standard water tank and a water pump through pipelines. The calibration device 1 may be an electric heater or other heat exchange device, as specified by the above standard.
The existing calibration device is composed of an electric heater with heat preservation, and the principle is that the calibration device is used for testing instead of a tested machine, namely, a heat pump water heater generates heat, the heater of the calibration device also generates heat, and the generated heat can be used for heating water; the calibration device is connected with the testing device instead of the tested machine, the heating capacity of the calibration device is tested by the testing device, the input power of the heater of the calibration device is compared with the heating capacity tested by the testing device, and the difference between the input power and the heating capacity is the heat leakage capacity of the testing device obtained by calibration. Then testing the performance of the commercial circulating heat pump water heater according to the testing method specified in the current standard GB/T21362-2008, and applying the following formula to obtain the heat leakage quantity (namely Q in the formula) of the testing device by the calibration l ) And inputting the obtained product into a formula to obtain the final heating quantity.
Q h ＝C×G×(t 2 -t 1 )/(3600×H×1000)+Q s +Q l
Wherein:
Q h -heat pump water heater heating capacity, unit: kW;
c-specific heat of water at average temperature, unit: j/(kg. DEG C);
g-mass of heated water, unit: kg;
t 1 -initial water temperature, unit: the temperature is lower than the temperature;
t 2 final water stop temperature, unit: the temperature is lower than the temperature;
h—heating time, time from test start time to test end time, unit: h, performing H;
Q s -heat storage of standard water tanks and pipes, unit: kW;
Q l -leakage of heat from standard tanks and pipes, unit: kW.
The power of the existing calibration device is not adjustable, the calibration device does not have the self heat leakage calibration function, the self heat leakage is uncertain, the heating efficiency of the self heating device is unknown, and therefore the test value is inaccurate. In addition, the current calibration device is simpler, and only the heat leakage quantity of the testing device at the current ambient temperature can be calibrated. In the actual testing process, the capability of the tested machine is changed, so that when the tested machines with different capabilities are tested, the calibration result of the constant-power calibration device has deviation.
The self heat leakage of the calibration device and the heating efficiency of the heater are unknown, and parameters such as working condition, water flow and the like in the test are different from those in the calibration, so that the calibration value is inconsistent with the actual heat leakage.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide a calibration device of a commercial circulating heat pump water heater testing device, which can accurately and dynamically calibrate the heat leakage quantity of the existing testing method/testing device, thereby enabling a laboratory to accurately test the heating quantity of a heat pump.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a calibration device for a commercial cycle heat pump water heater testing device, comprising: the device comprises a calibration water tank, heating equipment, a temperature acquisition module, a power test module and a control module, wherein,
the calibration water tank comprises an insulating box body and a plurality of water temperature measuring elements, wherein the insulating box body is used for containing water, and the water temperature measuring elements are used for measuring the water temperature in the insulating box body;
the heating device is used for heating water contained in the heat-insulating box body, and a heating piece of the heating device is arranged inside the heat-insulating box body;
the temperature acquisition module is respectively connected with the control module, the water temperature measuring element and the environment temperature measuring element, and is used for acquiring the temperature measured by the water temperature measuring element and the temperature measured by the environment temperature measuring element in real time and transmitting data to the control module; the environment temperature measuring element is used for measuring the environment temperature;
The power testing module is respectively connected with the control module and the heating equipment, and is used for testing the actual power of the heating equipment in real time and transmitting data to the control module;
the control module is used for acquiring the heat leakage coefficient K of the calibration device before calibrating the testing device leak And heating efficiency eta of the heating equipment, and acquiring heating quantity Q of the calibration device when calibrating the testing device 0 And according to the acquired heat leakage coefficient K of the calibration device leak Heating efficiency eta of the heating equipment and heating quantity Q of the calibration device 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 。
In the calibration device, as a preferred embodiment, the heat leakage Q of the test device 1 ＝P Input device ×η-Q leak -Q 0 -Q s ；
Wherein: p (P) Input device Taking the rated heating capacity of the commercial circulating heat pump water heater as a set value of work for the heating equipment, wherein the average value of the power of the heating equipment is kW in the period from the test starting time to the test ending time during calibration;
Q leak for the purpose of calibrating the instantaneous heat leakage quantity Q in the period from the test starting time to the test ending time leaki Is in kW;
Q 0 The unit of the heating capacity of the calibration device is kW;
Q s and the heat storage capacity of the testing device is shown as kW.
In the calibration device, as a preferred embodiment, the heating element is an electric heater, and the heating apparatus further includes: a power adjustment control device; the electric heaters are multiple groups of electric heaters with adjustable input power; the power regulation control device is connected with the control module and the electric heater and is used for regulating the total input power of the electric heater according to the instruction of the control module until the total input power reaches the set value of the electric heater. More preferably, the heating apparatus further comprises: the on-off devices are connected with the control module and the electric heater and are used for controlling the on-off of the electric heater according to the instruction of the control module so as to control the number of groups of the electric heater.
In the calibration device, as a preferred embodiment, the number of the on-off devices is identical to the number of the groups of the electric heaters, and each on-off device correspondingly controls whether one group of the electric heaters is connected for heating.
In the calibration device, as a preferred embodiment, the heating element is an electric heater, and the heating apparatus further includes: the on-off devices are connected with the control module and the electric heaters and are used for switching on one or more groups of electric heaters according to instructions of the control module so that the total input power of the electric heaters reaches a set value of the electric heater operation.
In the calibration device, as a preferred embodiment, the control module further fits a relationship curve between the heat leakage amount of the testing device and the environmental temperature and the circulating water flow according to recorded heat leakage amount data of the testing device corresponding to different circulating water flows at the same environmental temperature and circulating water flows at different environmental temperatures; and acquiring the heat leakage quantity of the testing device corresponding to the current ambient temperature and circulating water flow according to the current ambient temperature and circulating water flow and the relation curve.
The second object of the present invention is to provide a calibration method for a commercial circulating heat pump water heater testing device, adopting the calibration device, the steps of the calibration method include:
the step before calibration is carried out, the heat leakage coefficient K of the calibration device is obtained leak Obtaining the heating effect of the heating equipment of the calibration deviceThe rate eta, the calibration device is used for calibrating the commercial circulating heat pump water heater testing device;
the method comprises the steps of calibrating, namely connecting the calibrating device to the commercial circulating heat pump water heater testing device instead of the commercial circulating heat pump water heater, testing the heating capacity of the calibrating device under the conditions of preset environment temperature and preset circulating water flow of a water pump of the commercial circulating heat pump water heater testing device, and acquiring the heating capacity of the calibrating device according to a third formula, wherein the third formula is Q 0 ＝C×G×(t 2 -t 1 ) /(3600×h×1000), where: q (Q) 0 The unit is kW for calibrating the heating capacity of the device; c is the specific heat of water at an average temperature, in J/(kg. Deg.C), which is the average temperature of the initial water temperature and the final water temperature; g is the mass of the heated water in kg; t is t 1 The initial water temperature is given in degrees celsius; t is t 2 To terminate water temperature, the unit is °c; h is heating time, and the unit is H from the test starting time to the test ending time; and according to the obtained heat leakage coefficient K of the calibration device leak Heating efficiency eta of heating equipment and heating quantity Q of calibration device 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 The heat leakage quantity Q of the testing device 1 Input power P of =calibration device Input device Heat leakage Q of x heating efficiency eta-calibration device leak Heating quantity Q of calibration device 0 Heat storage quantity Q of test device s 。
In the calibration method, as a preferred embodiment, the heating element of the heating device is an electric heater, and in the step before calibration, the heat leakage coefficient of the calibration device is tested by adopting a 24-hour inherent energy consumption method; obtaining the heat leakage coefficient of the calibration device according to a first formula, wherein the first formula is as follows: k (K) leak ＝E/[S 1 ·(T-T am )]Wherein K is leak The heat leakage coefficient is as follows: W/K; e is the power consumption in the run time period, in units of: wh; s is S 1 To test the operation of the calibration device when the heat leakage coefficient is tested by adopting a 24-hour inherent energy consumption methodTime, unit: h, performing H; t is the average water temperature of a calibration water tank of the calibration device in the running time period, and the unit is: the temperature is lower than the temperature; t (T) am Unit for average ambient temperature for the run time period: DEG C.
In the calibration method, as a preferred embodiment, in the step before calibration, water with a set initial temperature of an actual volume is injected into a calibration water tank of the calibration device, and an electric heater of the calibration device is used for heating the water to enable the water temperature to rise to a set end temperature, and the electric heater stops working; obtaining the heating efficiency of the electric heater of the calibration device according to a second formula, wherein the second formula is eta=V/(theta) A -θ B )/(E 2 X 860) x 100%; wherein η is heating efficiency in units of: 100%; v is the actual volume of a calibration water tank of the calibration device, and the unit is: l is; θ A The unit is the measured value of the water temperature when the electric heater stops working: the temperature is lower than the temperature; θ B The unit is the measured value of the water temperature when the electric heater starts to work: the temperature is lower than the temperature; e (E) 2 The power consumption for heating water from a set initial temperature to a set end temperature is in kw·h.
Compared with the prior art, the invention has the beneficial effects that:
(1) The heat leakage quantity of the calibration device can be tested. At present, no standard is provided for testing and determining the heat leakage of the calibration device, but the heater has certain heat loss, the heat insulation material also has certain heat leakage, and if the calibration device cannot be calibrated automatically, the measured heat leakage result is inaccurate. According to the method for testing the thermal efficiency of the electric water heater, the temperature measuring points are arranged in the calibration device, so that the thermal efficiency of the heater can be automatically tested, and meanwhile, the heat leakage of the calibration device can be automatically calculated according to the water temperature in the calibration device and the external environment temperature.
(2) An actual operating mode operating curve can be fitted. The heat leakage quantity of the heat pump water heater testing device is different along with different environmental temperatures and different flow rates. In the laboratory for testing the heat pump water heater, nearly half of the laboratories have water tanks which are placed outdoors, namely, the environment temperature changes at any time. If the verification is only performed at a specific ambient temperature to obtain the device leakage heat, the verification value will be inaccurate when the ambient temperature changes. As are other operating parameters. The calibration device can automatically fit a curve according to the test data, and can automatically calculate the heat leakage quantity of the heat pump water heater test device under the current working condition according to the tested actual working condition in actual operation in future.
(3) The heating power is adjustable. The power of the heating equipment of the current calibration device is fixed and not adjustable, but the capacity of the tested heat pump water heater is changed, and when the power of the calibration device is not matched with the capacity of the tested heat pump water heater, the test result is inaccurate. The heating power of the heating equipment of the calibration device is adjustable, and the accuracy of the test result is improved.
Drawings
FIG. 1 is a schematic diagram of a calibration method of a heat pump water heater test device specified in GB/T21362-2008;
FIG. 2 is a schematic diagram of a calibration device of a commercial circulating heat pump water heater testing device in a preferred embodiment of the invention;
FIG. 3 is an operational curve fitting the actual conditions of a preferred embodiment of the present invention.
The device comprises a 1-calibration water tank, a 2-water temperature measuring element, a 3-electric heater, a 4-power adjusting and controlling device, a 5-temperature collecting module, a 6-on-off device, a 7-control module, an 8-water pump, a 9-environment temperature measuring element, a 10-standard water tank, an 11-power testing module, a 12-calibration device and a 13-thermometer.
Detailed Description
The technical scheme of the invention is further described in detail below by examples with reference to the accompanying drawings.
The invention provides a calibration device of a commercial circulating heat pump water heater testing device, referring to fig. 2, the calibration device 12 comprises: the water tank 1, the heating device, the temperature acquisition module 5, the power test module 11 and the control module 7 are calibrated, and the above components are described one by one. For convenience of description, the commercial circulating heat pump water heater testing device will be referred to as testing device in short, and the commercial circulating heat pump water heater will be referred to as tested machine in short.
The calibration water tank 1 includes: an insulated box body and a plurality of water temperature measuring elements 2. The heat insulation box body is used for containing water and is used as a place for heating the water. The water temperature measuring element 2 is used for measuring the water temperature in the heat insulation box body, and can be a common element such as platinum resistor. In order to more accurately measure the water temperature in the insulation box, the water temperature measuring elements 2 should be arranged as uniformly as possible inside the insulation box. In the embodiment of the invention, the platinum resistors are uniformly arranged along the height h of the heat insulation box, specifically, the platinum resistors are arranged along three horizontal planes of 1/4h, 1/2h and 3/4h of the heat insulation box, 4 platinum resistors are uniformly arranged in the inner part of each horizontal plane, and the average value of the temperatures measured by the 12 platinum resistors is the water temperature.
The heating element of the heating device is arranged inside the heat insulation box body and is used for heating water contained in the heat insulation box body, and can be used for heating static water, such as quantitative water contained in the heat insulation box body, and can also be used for heating flowing water, such as flowing water, entering the heat insulation box body, and being discharged from the heat insulation box body after being heated. The heating means preferably comprises an electric heater 3 which employs a direct heating means, and in other embodiments the heating means may comprise a heat exchange means which employs an indirect heating means.
The temperature acquisition module 5 is respectively connected with the control module 7, the water temperature measuring element 2 and the environment temperature measuring element 9, and is used for acquiring the temperature measured by the water temperature measuring element 2 and the temperature measured by the environment temperature measuring element 9 in real time and transmitting data to the control module 7. The ambient temperature measuring element 9 is used for measuring the ambient temperature.
The power test module 11 is connected to the control module 7 and the heating device (e.g. specifically connectable to a power supply of the electric heater 3 RST, see fig. 2), respectively, for testing the actual power of the heating device in real time and transmitting data to the control module 7.
The control module 7 is used for acquiring the heat leakage coefficient K of the calibration device before calibrating the testing device leak And heating efficiency eta of the heating equipment, and acquiring heating quantity Q of the calibration device when the test device is calibrated 0 And according to the obtained markLeakage coefficient K of the fixing device leak Heating efficiency eta of heating equipment and heating quantity Q of calibration device 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 . Specifically, the heat leakage quantity Q of the test device 1 Input power P of =calibration device Input device Heat leakage Q of x heating efficiency eta-calibration device leak Heating quantity Q of calibration device 0 Heat storage quantity Q of test device s Wherein, the input power P of the calibration device Input device The device is characterized in that the heating equipment takes the rated heating capacity of a tested machine as a set value for the operation of the heating equipment of a calibration device, and the average value of the power of the heating equipment is obtained in the period from the test starting time a to the test ending time b during calibration; heat leakage Q of calibration device leak Instantaneous heat leak Q in a period equal to the calibration time from the test start time a to the test end time b leaki Is the integrated value of (i.e. Q) leak ＝∫ b a Q leaki d i H, instantaneous leakage Q leaki Equal to the ambient temperature T acquired in real time during calibration ami And calibrating the water temperature T in the water tank i Is the difference between the heat leak coefficients K leak Product of (i.e. Q) leaki ＝K leak ×(T i -T ami ) The test starting time a is the time when the water inlet temperature of the calibration device measured during calibration is the set initial temperature, and the test ending time b is the time when the water outlet temperature of the calibration device measured during calibration is the set ending temperature. Heating quantity Q of calibration device 0 ＝C×G×(t 2 -t 1 ) /(3600×h×1000), where: q (Q) 0 The unit is kW; c is the specific heat of water at an average temperature, in J/(kg. Deg.C), which is the average of the measured initial water temperature and the measured end water temperature; g is the mass of the heated water in kg; t is t 1 The initial water temperature, namely the water temperature measured at the beginning of the test, is given in units of ℃; t is t 2 The unit is the final water stop temperature, namely the water temperature measured at the end time of the test; h is heating time, namely time from the test starting time to the test ending time, and the unit is H; in particular, the meaning of the parameters in the formula can be found in the standard GB/T21362-2Related description of the calculation formula of the heating capacity of the machine set in 008 heat pump water heater for commercial or industrial use and the like. Heat storage quantity Q of test device s The aforementioned criteria can also be referred to for acquisition of (c).
When the heat leakage quantity of the testing device is obtained, the heat leakage quantity of the calibration device and the heating efficiency of the heating equipment are fully considered, and the situation that the obtained heat leakage quantity result of the testing device is inaccurate due to certain heat loss and heat leakage loss of the heating equipment is avoided, so that the heat leakage quantity of the testing device can be accurately tested, and the total heating quantity of a tested machine can be accurately tested.
The acquisition of the heat leakage coefficient and the heating efficiency of the calibration device will be described below by taking the example in which the heating device includes an electric heater. The heat leakage coefficient and heating efficiency of other heat exchange equipment can be found in the specifications of relevant industry standards.
Can be tested by adopting a 24-hour inherent energy consumption method before calibration to obtain the heat leakage coefficient K of the calibration device leak . Specifically, the heat leakage coefficient of the calibration device is obtained according to a first formula, wherein the first formula is K leak ＝E/[S 1 ·(T-T am )]Wherein K is leak The heat leakage coefficient is W/K; e is the power consumption of the operation time period, and the unit is Wh; s is S 1 The unit of the operation time is h when the heat leakage coefficient of the calibration device is tested by adopting a 24-hour inherent energy consumption method; t is the average water temperature of a calibration water tank of the calibration device in the running time period, and the unit is the temperature; t (T) am The average ambient temperature in degrees celsius for the run time period.
When the test is carried out, water is filled into the calibration water tank 1, stop valves of an inlet and an outlet of the calibration water tank 1 are closed, the water temperature is heated from a set initial temperature to a set end temperature under the preset environmental temperature condition, such as constant environmental temperature of 20 ℃, the water temperature is kept within an error range, and the running time S from a certain breaking point to a certain breaking point after 24 hours of running is recorded 1 Power consumption E, average water temperature T, average ambient temperature T am . The "off-point" means that the electric heater stops heating after the water temperature reaches the set temperature (off-temperature), whereAnd in the following examples, the initial temperature is set to 15 ℃, the end temperature is set to 55 ℃, the error range is + -1 ℃ for the example, the off temperature is 56 ℃, and the on temperature is 54 ℃. When the water temperature is higher than the cut-off temperature, the electric heater can stop working (heating), the water temperature is reduced, and after the water temperature is reduced to a certain temperature (namely the cut-in temperature), the electric heater can work again to enable the water temperature to rise, and the cycle is performed. The electric heater works or not through the control module 7, and the running time S 1 Tested and calculated by the control module 7; the measurement of the water temperature is measured by the water temperature measuring element 2 to realize the measurement of the average water temperature in the running time, the measurement of the ambient temperature is measured by the ambient temperature measuring element 9 to realize the measurement of the average ambient temperature in the running time, and the measured data are transmitted to the control module 7; the power consumption E of the electric heater in the operation time period is measured by the power test module 11 and transmitted to the control module 7; finally, the control module 7 processes the data and calculates the leakage heat coefficient K of the calibration device 12 leak . The preset environmental temperature, the set initial temperature and the set end temperature of the water temperature mentioned in the 24h inherent energy consumption method should be consistent with the environmental temperature, the set initial temperature and the set end temperature of the water temperature at the time of the standard, namely the environmental temperature (for example, 20 ℃) mentioned in the method should be consistent with the environmental temperature value (for example, 20 ℃) at the time of the standard, the set initial temperature (for example, 15 ℃) should be consistent with the set initial temperature value (for example, 15 ℃) at the time of the standard, and the set end temperature and the water temperature (for example, 55 ℃) should be consistent with the set end temperature value (for example, 55 ℃) at the time of the standard.
In order to obtain the heating efficiency eta of the electric heater, water with the set initial temperature of the actual volume is injected into the calibration water tank 1 of the calibration device before calibration, the electric heater is used for heating the water, so that the water temperature is increased to the set end temperature, and the electric heater stops working; obtaining the heating efficiency of the electric heater according to a second formula, wherein the second formula is eta=V/(theta) A -θ B )/(E 2 X 860) x 100%; wherein eta is heating efficiency, and the unit is 100%; v is the actual volume of a calibration water tank of the calibration device, and the unit is L; θ A The measured value of the water temperature when the electric heater stops working is the set knotThe average water temperature of the calibration water tank when the electric heater stops heating for the first time after the temperature of the beam (or called as the disconnection temperature) is measured in the unit of DEG C; θ B The measured value of the water temperature when the electric heater starts to work, namely the average water temperature of the calibration water tank 1 before the electric heater 3 heats, is given in the unit of DEG C; e (E) 2 The power consumption of primary heating required for heating water from the set initial temperature to the set end temperature, that is, the power consumption of heating of the electric heater in the period from when the electric heater 3 starts to heat to when the electric heater 3 stops heating for the first time, is expressed in kw·h.
Note that, the primary heating power consumption E in the second formula 2 The former is the power consumption for determining the heating of the water in the water tank 1 by the electric heater 3 from the set initial temperature to the set end temperature (i.e., the off temperature), unlike the power consumption E during the operation time in the first equation, and the latter is the power consumption that needs to be input in order to maintain the temperature after the water in the water tank 1 has reached the set end temperature.
The heating quantity Q of the calibration device is as follows 0 The acquisition process of (2) is described in detail.
In the calibration process, the calibration device 12 is connected to the testing device instead of the tested machine (namely the commercial circulating heat pump water heater), namely the position of the tested machine in the testing device is replaced by the calibration water tank 1 and the electric heater, and the medium water is heated by the electric heater 3 instead of the tested machine. The environmental temperature is regulated and controlled to the preset environmental temperature, quantitative constant-temperature water is injected into the testing device, and then the calibration device 12, the water pump 8 of the testing device and the like are started to start running. The control module 7 controls the output power of the electric heater 3 by taking the rated heating capacity of the tested machine as the set value of the electric heater 3. Under the operation of the electric heater 3, the water temperature gradually rises, the water temperature is taken from the average temperature of 8 platinum resistors of the standard water tank 10, the time when the water temperature reaches a certain value (such as 15 ℃) is recorded as the test start time, and the time when the water temperature reaches another value (such as 55 ℃) is recorded as the test end time. The water temperature at the beginning of the test (i.e. the initial temperature is set) and the water temperature at the end of the test (the end temperature is set) can be set according to the relevant regulations in the national standard GB/T21362-2008, such as for a common heat pump water heater The temperature is 15 ℃, and the set ending temperature is 55 ℃; for the low-temperature heat pump water heater, the initial temperature is set to 9 ℃, and the end temperature is set to 55 ℃. According to the national standard GB/T21362-2008, the heating quantity Q of the calibration device 12 is calculated by a third formula 0 ，Q 0 ＝C×G×(t 2 -t 1 ) /(3600×h×1000), where: q (Q) 0 The unit is kW for the heating capacity of the calibration device 12; c is the specific heat of water at an average temperature, in J/(kg. Deg.C), which is the average temperature of the initial water temperature and the final water temperature; g is the mass of the heated water in kg; t is t 1 The initial water temperature is given in degrees celsius; t is t 2 For ending the water temperature, the unit is °c; h is the heating time, and the unit is H from the start time to the end time of the test. The quantification (i.e., water injection amount) of the constant temperature water can be calculated by the following formula: according to formula q v ＝0.86×Q n And/5, calculating circulating water flow of the water pump 8, wherein: q v Is the circulating water flow, and the unit is m 3 /h；Q n The nominal heating capacity (i.e., the rated heating capacity, i.e., the set point at which the heating equipment of the calibration device 12 operates) for a commercial circulating heat pump water heater is in kW. And then according to the formula: water injection quantity=q n The water injection amount of the test device was calculated by x 1000 x 3600/(c× (55-15)), where: c is the specific heat of water, the unit is J/(kg. DEG C), 55 is the set end temperature value, and 15 is the set initial temperature value.
In the process of obtaining the heat leakage Q of the testing device l Then, the total heating quantity Q of the tested machine can be calculated h The specific formula is as follows: q (Q) h ＝Q 0 +Q s +Q l ＝C×G×(t 2 -t 1 )/(3600×H×1000)+Q s +Q l； Q in the formula 0 The heating quantity of the tested machine is the heating quantity generated by the medium water heated by the tested machine in the testing device.
Because the heat leakage of the testing device is not calibrated by the calibration device before each heating capacity testing test is carried out in actual operation, when the calibration device is not used for calibration and the testing conditions (the ambient temperature and the circulating water flow during the heating capacity testing test) are different from the testing conditions during the calibration, the control module 7 of the calibration device 12 has the function of fitting the running curve in order to accurately obtain the heat leakage of the test, and can fit the relation curve between the heat leakage of the testing device and the ambient temperature and the circulating water flow according to the test data recorded for many times before, and the control module 7 can automatically calculate the heat leakage of the testing device according to the current ambient temperature and the circulating water flow in actual application. Fitting the curve can be performed by using a multi-element equation and the like. Specifically, the control module 7 obtains the heat leakage of a group of test devices under one test condition, when the test conditions are N, obtains the heat leakage of N groups of test devices under N test conditions, and a certain test condition refers to different circulating water flow conditions under a certain environmental temperature, and different circulating water flows correspond to the heat leakage of different test devices, so that the heat leakage of a group of test devices under a certain test condition is formed, namely, the heat leakage of a test device is obtained under a certain environmental temperature and a certain circulating water flow, and different circulating water flows are converted, so that the heat leakage of a group of test devices under a certain environmental temperature is obtained. The test conditions differ from each other in that the ambient temperature is 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ respectively, N is a natural number, N is 2 or more, preferably 6 or more.
When the environmental temperature T is to be subjected to heating capacity test am When the measured water flow is consistent with a certain environmental temperature in N recorded test conditions, fitting the data of different circulating water flows at the environmental temperature to obtain a curve, and obtaining the heat leakage quantity of the test device to be subjected to the heating quantity test, wherein the ordinate is the heat leakage quantity of the test device, the abscissa is the circulating water flow, the curve fitted by the different circulating water flows at the certain environmental temperature is a straight line, and the circulating water flow is 10m at the environmental temperature of 20 DEG C 3 Under the condition of/h, the heat leakage quantity of the testing device is checked to be 3.5kW.
When the environment temperature T of the heating capacity test is to be carried out am When the environmental temperature is inconsistent with the environmental temperature in the recorded N test conditions, selecting two test conditions closest to the environmental temperature, and marking the two test conditions as the upper environmental temperatureT am1 (which is greater than the ambient temperature at which the heating amount test is to be performed) and a lower ambient temperature T am2 (which is less than the ambient temperature at which the heating capacity test is to be performed) is determined by equation Q l ＝(Q l1 -Q l2 )×(T am -T am2 )/(T am1 -T am2 )+Q l2 The temperature of the computing environment is T am And a circulating water flow rate of q 1 Under the condition, the heat leakage quantity, Q of the testing device l1 Indicating an ambient temperature T am1 And a circulating water flow rate of q 1 Under the condition, the heat leakage quantity, Q of the testing device l2 Indicating an ambient temperature T am2 And a circulating water flow rate of q 1 The heat leak quantity of the test device under the condition. Since the circulating water flow is related to the nominal heating capacity of the commercial circulating heat pump water heater, and the set value of the operation of the heating device (namely the input heating power) is also related to the nominal heating capacity of the commercial circulating heat pump water heater, the input heating power of the heating device can be changed to correspond to the nominal heating capacity of different commercial circulating heat pump water heaters, and then different circulating water flows can be obtained.
In order to vary the heating power input to the heating device to correspond to different circulating water flows, the heating device preferably comprises an electric heater 3 and a power adjustment control 4. The input power of the electric heaters 3 is adjustable, and the number of the electric heaters is multiple groups of electric heaters, such as 2-5 groups; in the embodiment of the invention, the electric heaters 3 are heating pipes, and 5 groups are provided. The power regulation control device 4 is connected with the control module 7 and the electric heater 3, and is used for regulating the input power of the electric heater 3 according to the instruction of the control module 7 until the set value of the electric heater 3 is reached. In other embodiments, the heating device may include multiple sets of electric heaters of different fixed power values.
Preferably, in order to more precisely control the input power of the electric heater, the heating apparatus further includes: the number of the on-off devices 6 is preferably consistent with the number of the groups of the electric heaters 3, and each on-off device 6 controls whether a group of the electric heaters 3 corresponding to the on-off device is connected for heating or not.
Specifically, the on-off device 6 switches on one or more groups of electric heaters 3 according to the instruction sent by the control module 7, if the number of the electric heaters is 5 groups, the input power of each group is 20kW, the total input power is 100kW, the set heating amount is 30kW, the control module 7 sends an instruction to the on-off device to instruct a certain two groups of electric heaters to work, and at the moment, the on-off device controls the two groups of electric heaters to switch on and the rest to switch off; after the two sets of heaters are put into operation, since the number of sets of heaters reaches 30kW and the total sets of heaters are put into operation is 40kW, the control module 7 controls the power adjustment control device 4 according to the proper output proportion to which the 40kW should be adjusted, that is, the power adjustment control device 4 adjusts the output proportion of the electric heater 3 to be consistent with the set value after receiving the number of sets of the electric heater 3 to be operated. In practice, the minimum adjustment ratio (i.e., the minimum adjustment capability) that the power adjustment control device 4 can achieve is fixed; for example, if the on-off device 6 is not used, the input power of the electric heater (e.g., 100 kW) can be adjusted only by the power adjustment control device 4, and if it is desired to adjust to 20kW, the minimum adjustment capability of the power adjustment control device 4 is 1%, i.e., the minimum adjustable is ±1kW, the deviation is (1/20) ×% =5%; whereas if the on-off means 6 is employed, the group of electric heaters corresponding thereto may be heaters (e.g., 30 kW) of smaller rated power, which are turned on and adjusted to the target input power of 20kW by the power adjustment control means 4, and the minimum adjustment capacity of the power adjustment control means 4 is 1%, the minimum adjustable is ±0.3kW, and the deviation is only (0.3/20) ×% = 1.5%, so that it is said that the input power of the electric heater 3 is more precisely controlled by the on-off means 6.
In another embodiment provided by the invention, the power adjustment control device 4 is not used, but only the on-off device 6 is adopted, namely, the heating equipment comprises the electric heater 3 and the on-off device 6, the on-off device 6 is connected with the control module 7 and the electric heater 3, and is used for switching on one or more groups of electric heaters according to the instruction of the control module 7 so as to enable the total power of the electric heater to be close to a set value.
The embodiment of the invention also provides a calibration method of the commercial circulating heat pump water heater testing device, and the calibration device is adopted. The method comprises the following specific steps:
the step before calibration, the heat leakage coefficient K of the calibration device is obtained leak The heating efficiency eta of heating equipment of a calibration device is obtained, and the calibration device is used for calibrating a commercial circulating heat pump water heater testing device;
the calibration method comprises the steps of connecting a calibration device to a commercial circulating heat pump water heater testing device instead of the commercial circulating heat pump water heater, testing the heating capacity of the calibration device under the preset environment temperature and the circulating water flow of a water pump of the commercial circulating heat pump water heater testing device, and then obtaining the heating capacity of the calibration device according to a third formula, wherein the third formula is Q 0 ＝C×G×(t 2 -t 1 ) /(3600×h×1000); and according to the obtained heat leakage coefficient K of the calibration device leak Heating efficiency eta of heating equipment and heating quantity Q of calibration device 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 Heat leakage Q of test device 1 Input power P of =calibration device Input device Heat leakage Q of x heating efficiency eta-calibration device leak Heating quantity Q of calibration device 0 Heat storage quantity Q of test device s 。
In the step before calibration, the calibration device is heated by an electric heater, and the heat leakage coefficient of the calibration device is tested by adopting a 24-hour inherent energy consumption method; obtaining the heat leakage coefficient of the calibration device according to a first formula, wherein the first formula is as follows: k (K) leak ＝E/[S 1 ·(T-T am )]Wherein K is leak The heat leakage coefficient is as follows: W/K; e is the power consumption in the run time period, in units of: wh; s is S 1 The unit is the running time when the heat leakage coefficient of the calibration device is tested by adopting a 24-hour inherent energy consumption method: h, performing H; t is the average water temperature of a calibration water tank of the calibration device in the running time period, and the unit is: the temperature is lower than the temperature; t (T) am Unit for average ambient temperature for the run time period: DEG C.
In the step before calibration, water with the set initial temperature of the actual volume is injected into a calibration water tank of the calibration device, and the water is heated by an electric heater of the calibration device to increase the water temperature toSetting an ending temperature, and stopping the electric heater; the heating efficiency of the heater of the calibration device is obtained according to a second formula, wherein the second formula is eta=V/(theta) A -θ B )/(E 2 X 860) x 100%; wherein η is heating efficiency in units of: 100%; v is the actual volume of a calibration water tank of the calibration device, and the unit is: l is; θ A The measured value of the water temperature when the electric heater stops working is given by the following units: the temperature is lower than the temperature; θ B The measured value of the water temperature when the electric heater starts to work is given by the following units: the temperature is lower than the temperature; e (E) 2 The power consumption for heating water from a set initial temperature to a set end temperature is in kw·h.
Example 1
In this embodiment, the electric heater 3 of the calibration device 12 is composed of 5 groups of 20kW heating pipes, each group of heating pipes being connected to UT550 (i.e. power adjustment control device 4) and solid state relay SSR (i.e. on-off device 6). If the rated heating capacity of the to-be-calibrated tested machine is 55kW, the software of the control system 7 automatically calculates the heater assembly required to be put into according to the required heat, in the embodiment, 3 groups of heating pipes are required to be switched on, 2 groups of heating pipes are required to be switched off, the UT550 automatically adjusts the output proportion of the 3 groups of heating pipes, and the minimum resolution can reach 1%, so that the input of the electric heater 3 can be accurately controlled to be 55kW.
And 4 platinum resistors are uniformly arranged in each horizontal plane along the three horizontal planes of 1/4h, 1/2h and 3/4h of the height h of the calibration water tank 1, and 12 platinum resistors are used for testing the temperature of the calibration device 12, namely the water temperature in the calibration water tank 1. The temperature acquisition module 5 acquires the temperatures of 12 platinum resistors in the calibration water tank 1 in real time.
First, the heat leak coefficient of the calibration device 12 itself is calibrated before formally starting the calibration test.
The calibration water tank 1 is filled with water, the stop valves of the inlet and the outlet of the calibration water tank 1 are closed, the water temperature (average value measured by 12 platinum resistances) is heated from 15 ℃ to 55 ℃ under the condition of constant 20 ℃, the temperature is kept at 55+/-1 ℃, and when the temperature is lower than 54 ℃, the software of the control system 7 controls the electric heater 3 (namely the heating pipe) to work until the temperature reaches 56 ℃. The power meter (i.e. the power test module 11) is connected with the heating pipe (i.e. the electric heatingThe heater 3) and a control module 7, the power meter tests the power of the heating pipe in real time and transmits data to the control module 7. The control module 7 records the time from when the electric heater with the temperature higher than 56 ℃ stops working to when the electric heater with the temperature higher than 56 ℃ stops working after 24 hours, namely the operation time S 1 (measurement of S in this example) 1 =24.5 h) and the cumulative power consumption E (e=35.6 kWh measured in this example), the average water temperature T (average of water temperatures in this period, t=55.6 ℃ measured in this example), and the average ambient temperature T am (average value of ambient temperature in this period, T is measured in this example) am Heat leak coefficient k=20.15℃) leak Calculated by the following formula (i.e., the first formula). In this embodiment, the leakage heat coefficient is 41W/K.
K leak ＝E/[S 1 ·(T-T am )]
Wherein:
K leak -heat leakage coefficient, unit: W/K;
e-power consumption in run time, collected and tested by the power meter, units: wh;
S 1 run time, unit of software testing and calculation by the control module 7: h, performing H;
t-average water temperature in the running time, i.e. the average of the water temperature actually measured when off and the water temperature actually measured when on, measured by the water temperature measuring element 2 of the calibration device 12, units: the temperature is lower than the temperature;
T am average ambient temperature during run time, measured by the ambient temperature measuring element 9, unit: DEG C.
And (two) the heating efficiency of the electric heater 3 was tested.
In the present embodiment, the actual volume V of the calibration water tank 1 is 600L, the initial water temperature θ B 15.0 ℃ and average water temperature theta at turn-off A 55.5 ℃ and power consumption E 2 Is 27.9 kW.h. The heating efficiency η of the electric heater calculated according to the following equation (i.e., the second equation) is 98%.
η＝V/(θ A -θ B )/(E 2 ×860)×100％
Wherein:
η -energy efficiency, 100%;
v-calibrating the actual volume of a water tank of the device, L;
θ A the average water temperature at the time of disconnection, that is, the average water temperature at the time of the first stop of heating of the heater after the set temperature (i.e., the disconnection temperature of 56 ℃) is reached, measured by the water temperature measuring element 2 of the calibration device 12;
θ B the average water temperature before power-on, namely the average water temperature of the calibration water tank before heating by the heater, is measured by the water temperature measuring element 2 of the calibration device 12;
E 2 And the power consumption of primary heating, namely the power consumption of heating of the electric heater from the start of heating of the electric heater to the first stop of heating of the electric heater, is collected and tested by a power meter, and is kW.h.
And thirdly, starting to formally perform a calibration test of the commercial circulating heating type heat pump water heater testing device.
The calibration device 12 is connected to the test device as shown in fig. 2 instead of the machine under test. The circulating water flow rate of the water pump 8 was calculated according to the following, and the circulating water flow rate in this example was calculated to be 9.46m 3 /h。
q v ＝0.86×Q n /5
Wherein:
q v -circulating water flow, unit: m is m 3 /h；
Q n -nominal heating capacity of the heat pump water heater, unit: kW.
The water injection amount of the test device is calculated according to the following formula, and the water injection amount in the standard water tank 10 is 1184kg.
Water injection quantity=q n ×1000×3600/(C×(55-15))
Wherein: c-specific heat of water at average temperature, unit: j/(kg. DEG C.).
1184kg of constant temperature water is firstly injected into the system, the temperature of the water is lower than 15 ℃ (the temperature of the water is 10 ℃ in the embodiment), and then the calibration device 12, the water pump 8 of the test system and the like are started to operate. Electric heater 3 in calibration device 12The water temperature gradually rises, the water temperature is taken from the average temperature of 8 platinum resistors of the standard water tank 10, the time when the water temperature reaches 15 ℃ is recorded as the test start time, and the time when the water temperature reaches 55 ℃ is recorded as the test end time. According to the standard GB/T21362-2008, the heating value Q of the calibration device 12 is calculated by the following formula (i.e. the third formula) 0 ：
Q 0 ＝C×G×(t 2 -t 1 )/(3600×H×1000)
Wherein:
Q 0 -the heating capacity of the calibration device 12, unit: kW;
c-specific heat of water at average temperature, unit: j/(kg. DEG C), the average temperature means the average temperature of the initial water temperature and the final water temperature;
g-mass of heated water, unit: kg;
t 1 -initial water temperature, unit: the temperature is lower than the temperature;
t 2 final water stop temperature, unit: the temperature is lower than the temperature;
h—heating time, time from test start time to test end time, unit: h.
through testing, the initial water temperature t 1 Is 15.03 ℃, and the water temperature t is stopped 2 55.12 ℃ and heating time H of 1.18H; substituting the above values and C=4.18X100J/(kg·deg.C) into the above values to obtain the heating quantity Q of the calibration device 0 ＝C×1184×(55.12-15.03)/(3600×1.18×1000)＝46.71kW。
From the beginning of the test to the end of the test, the average power (i.e. the actual input power of the heating device) P of the calibration device 12 is tested and recorded according to the power meter of the calibration device 12 Input device Is 52.3kW. According to the previous calculation (see the (first) part above), the heat leakage coefficient of the calibration device 12 is 41W/K, the software in the control module 7 of the calibration device 12 can automatically calculate the temperature difference between the water temperature of the calibration water tank 1 and the ambient temperature at each acquisition time in the period from the test start time to the test end time, further calculate the instantaneous heat leakage of the calibration device 12, and obtain the final heat leakage amount to be 615W through integration. According to The previous calculation (see section (second) above) gives a heating efficiency of 98% for the heating tube. In addition, the heat storage quantity Q of the test device (comprising a standard water tank and a pipeline) is calculated s Is 0.62kW. The heat leakage Q of the test device can be calculated according to the following formula 1 。
Heat leakage Q of test device 1 = (input power P of electric heater Input device Heat leakage Q of x heating efficiency eta-calibration device leak ) Heating quantity Q of calibration device 0 Heat storage quantity Q of test device s
Specifically, the heat leakage amount of the test device in this embodiment= (52.3×0.98-0.615) -46.71-0.62= 3.309kW.
The calibration result of the calibration device was 3.309kW for the heat leak of this test device.
And fourthly, formally performing a heating capacity test of the commercial circulating heating type heat pump water heater.
The test was performed as described in the above section (III), except that the calibration device was replaced with the machine to be tested. The measured heating capacity of the heat pump water heater is 46.44KW. The calibrated heating capacity of the heat pump water heater, namely the total heating capacity of the heat pump water heater
Q h ＝46.44+Q s +Q l ＝46.44+0.62+3.309＝50.37kW。
If the heating efficiency of the heater and the heat leakage of the calibration device are not considered according to the conventional calibration device, the deviation from the actual situation exists.
Example 2
Considering that the environment temperature and the circulating water quantity of the test can change according to different test items, and the environment temperature and the circulating water quantity have influence on the calibration result of the calibration device, when the calibration device provided by the invention is used for calibrating, under different test conditions (namely, under the conditions that the environment temperature is 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃ and 30 ℃ respectively during the calibration test), different power gears (corresponding to the tested machines with different rated heating capacities) are selected for testing, and different water flows (corresponding to the different circulating water quantities of the circulating water pump) are regulated, so that an operation curve for fitting actual working conditions is obtained, as shown in fig. 3. In the actual test, the leakage heat of the test device can be interpolated by using the curve shown in fig. 3 according to the flow of the tested heat pump water heater during operation and the environment temperature of the standard water tank.
The leakage heat of different water flows at the specified ambient temperature (such as 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃ and 30 ℃ in the embodiment) can be obtained by checking the curve: the abscissa is water flow, one point of the abscissa is selected according to the water flow during testing, and then the intersection point of the curve under the corresponding environment temperature is obtained, and the ordinate of the intersection point is the water flow and the heat leakage quantity under the environment temperature, such as 10m 3 The heat leakage of the water flow rate/h at the ambient temperature of 20 ℃ is checked to be 3.5kW.
If tested at non-specified ambient temperatures, e.g. water flow of 10m 3 /h, ambient temperature T am Heat leak quantity Q of 17 DEG C l Interpolation calculation can be performed, namely, the interpolation calculation is obtained according to a searching curve: the water flow is 10m 3 /h, ambient temperature T am2 Is heat leakage Q at 15 DEG C l2 Is 3kW, water flow is 10m 3 /h, ambient temperature T am1 Heat leakage Q at 20 DEG C l1 Is 3.5kW, then both are interpolated as follows:
Q l ＝(Q l1 -Q l2 )×(T am -T am2 )/(T am1 -T am2 )+Q l2
＝(3.5-3)×(17-15)/(20-15)+3
＝3.2kW
the above example is only one embodiment of the present invention, which is described in detail and is not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (10)
1. A calibration device for a commercial circulating heat pump water heater testing device, the calibration device comprising: the device comprises a calibration water tank, heating equipment, a temperature acquisition module, a power test module and a control module, wherein,
the calibration water tank comprises an insulating box body and a plurality of water temperature measuring elements, wherein the insulating box body is used for containing water, and the water temperature measuring elements are used for measuring the water temperature in the insulating box body;
the heating device is used for heating water contained in the heat-insulating box body, and a heating piece of the heating device is arranged inside the heat-insulating box body;
the temperature acquisition module is respectively connected with the control module, the water temperature measuring element and the environment temperature measuring element, and is used for acquiring the temperature measured by the water temperature measuring element and the temperature measured by the environment temperature measuring element in real time and transmitting data to the control module; the environment temperature measuring element is used for measuring the environment temperature;
the power testing module is respectively connected with the control module and the heating equipment, and is used for testing the actual power of the heating equipment in real time and transmitting data to the control module;
the control module is used for acquiring the heat leakage coefficient K of the calibration device before calibrating the testing device leak And heating efficiency eta of the heating equipment, and acquiring heating quantity Q of the calibration device when calibrating the testing device 0 And according to the acquired heat leakage coefficient K of the calibration device leak Heating efficiency eta of the heating equipment and heating quantity Q of the calibration device 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 。
2. The calibration device according to claim 1, wherein the test device has a heat leak Q 1 ＝P Input device ×η-Q leak -Q 0 -Q s ；
Wherein: p (P) Input device Taking the rated heating capacity of the commercial circulating heat pump water heater as a set value of work for the heating equipment, wherein the average value of the power of the heating equipment is kW in the period from the test starting time to the test ending time during calibration;
Q leak for the purpose of calibrating the instantaneous heat leakage quantity Q in the period from the test starting time to the test ending time leaki Is in kW;
Q 0 the unit of the heating capacity of the calibration device is kW;
Q s and the heat storage capacity of the testing device is shown as kW.
3. The calibration device according to claim 1 or 2, wherein the heating element is an electric heater, the heating apparatus further comprising: a power adjustment control device; the electric heaters are multiple groups of electric heaters with adjustable input power; the power regulation control device is connected with the control module and the electric heater and is used for regulating the total input power of the electric heater according to the instruction of the control module until the total input power reaches the set value of the electric heater.
4. A calibration device according to claim 3, wherein the heating apparatus further comprises: the on-off devices are connected with the control module and the electric heater and are used for controlling the on-off of the electric heater according to the instruction of the control module so as to control the number of groups of the electric heater.
5. The calibration device of claim 4, wherein the number of on-off devices corresponds to the number of groups of electric heaters, each on-off device correspondingly controlling whether a group of electric heaters is on for heating.
6. The calibration device according to claim 1 or 2, wherein the heating element is an electric heater, the heating apparatus further comprising: the on-off devices are connected with the control module and the electric heaters and are used for switching on one or more groups of electric heaters according to instructions of the control module so that the total input power of the electric heaters reaches a set value of the electric heater operation.
7. The calibration device according to claim 1, wherein the control module is further configured to fit a relationship curve between the heat leak capacity of the test device and the ambient temperature and the circulating water flow according to the recorded heat leak capacity data of the test device corresponding to different circulating water flows at the same ambient temperature and circulating water flows at different ambient temperatures; and acquiring the heat leakage quantity of the testing device corresponding to the current ambient temperature and circulating water flow according to the current ambient temperature and circulating water flow and the relation curve.
8. A method for calibrating a commercial circulating heat pump water heater testing device, characterized in that the calibrating device of claim 1 is adopted, and the steps of the calibrating method comprise:
the step before calibration is carried out, the heat leakage coefficient K of the calibration device is obtained leak The heating efficiency eta of the heating equipment of the calibration device is obtained, and the calibration device is used for calibrating the commercial circulating heat pump water heater testing device;
the method comprises the steps of calibrating, namely connecting the calibrating device to the commercial circulating heat pump water heater testing device instead of the commercial circulating heat pump water heater, testing the heating capacity of the calibrating device under the conditions of preset environment temperature and preset circulating water flow of a water pump of the commercial circulating heat pump water heater testing device, and acquiring the heating capacity of the calibrating device according to a third formula, wherein the third formula is Q 0 ＝C×G×(t 2 -t 1 ) /(3600×h×1000), where: q (Q) 0 The unit is kW for calibrating the heating capacity of the device; c is the specific heat of water at an average temperature, in J/(kg. Deg.C), which is the average temperature of the initial water temperature and the final water temperature; g is the mass of the heated water in kg; t is t 1 The initial water temperature is given in degrees celsius; t is t 2 To terminate water temperature, the unit is °c; h is heating time, and the unit is H from the test starting time to the test ending time; and according to the obtained heat leakage coefficient K of the calibration device leak Heating efficiency eta of heating equipment and heating of calibration deviceQuantity Q 0 And heat storage quantity Q of test device s Obtaining the heat leakage Q of the testing device 1 The heat leakage quantity Q of the testing device 1 Input power P of =calibration device Input device Heat leakage Q of x heating efficiency eta-calibration device leak Heating quantity Q of calibration device 0 Heat storage quantity Q of test device s 。
9. The calibration method according to claim 8, wherein the heating element of the heating device is an electric heater, and the heat leakage coefficient of the calibration device is tested by adopting a 24-hour inherent energy consumption method in the pre-calibration step; obtaining the heat leakage coefficient of the calibration device according to a first formula, wherein the first formula is as follows: k (K) leak ＝E/[S 1 ·(T-T am )]Wherein K is leak The heat leakage coefficient is as follows: W/K; e is the power consumption in the run time period, in units of: wh; s is S 1 In order to test the operation time of the heat leakage coefficient of the calibration device by adopting a 24-hour inherent energy consumption method, the unit is as follows: h, performing H; t is the average water temperature of a calibration water tank of the calibration device in the running time period, and the unit is: the temperature is lower than the temperature; t (T) am Unit for average ambient temperature for the run time period: DEG C.
10. The calibration method according to claim 9, wherein in the pre-calibration step, water of a set initial temperature of an actual volume is injected into a calibration water tank of the calibration device, the water is heated by an electric heater of the calibration device, the water temperature is raised to a set end temperature, and the electric heater stops working; obtaining the heating efficiency of the electric heater of the calibration device according to a second formula, wherein the second formula is eta=V/(theta) A -θ B )/(E 2 X 860) x 100%; wherein η is heating efficiency in units of: 100%; v is the actual volume of a calibration water tank of the calibration device, and the unit is: l is; θ A The unit is the measured value of the water temperature when the electric heater stops working: the temperature is lower than the temperature; θ B The unit is the measured value of the water temperature when the electric heater starts to work: the temperature is lower than the temperature; e (E) 2 To set the initial temperature of the waterThe power consumption for heating to a set end temperature is in kW.h.
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| CN106768495A (en) * | 2017-01-04 | 2017-05-31 | 中标能效科技（青岛）有限公司 | A kind of commercial circulation heat pump water heater performance testing device and method of testing |
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| CN202041227U (en) * | 2010-12-29 | 2011-11-16 | 宁波奥克斯空调有限公司 | Performance detection system based on drainage method of air source heat pump water heater |
| US8353625B1 (en) * | 2011-10-03 | 2013-01-15 | Hsi Fire & Safety Group, Llc | Heat detector tester |
| CN105768894A (en) * | 2016-01-29 | 2016-07-20 | 佛山市顺德区美的饮水机制造有限公司 | Hot water production equipment as well as outlet water temperature calibration method and device thereof |
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