CN103267362A - Constant temperature flow control method for heat pump water heater and double-system unit using same - Google Patents
Constant temperature flow control method for heat pump water heater and double-system unit using same Download PDFInfo
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Abstract
The invention discloses a constant temperature flow control method for a heat pump water heater and a double-system unit using the same, relates to a fluid heater utilizing a heat pump and a control method thereof, and particularly relates to a constant temperature flow control method for the heat pump water heater and a double-system primary heating type heat pump water heater unit using the method. The double-system primary heating type hot pump water heater unit comprises a heat pump system A, a heat pump system B, a water supply heating system C and a constant temperature flow control device, wherein PID regulation on water flow is performed according to outlet water temperature; an outlet water temperature set value is set as a target value, and the opening of a constant temperature flow valve is controlled according to a checking value of the outlet water temperature so as to adjust the water flow; when the temperature of a water box is low, a constant temperature water pump and a compressor are started, and the unit operates at constant temperature; when inlet water temperature is too high, a bypass-valve is opened; and one system in a double-system generates a fault and stops operation, the outlet water set temperature is down-adjusted, the water flow of a heat pump unit is guaranteed, and the condensation effect and heating capacity and energy efficiency of the unit are improved, so that the other system without the fault is safely and stably operated in an efficient manner.
Description
Technical field
The present invention relates to a kind of fluid heater and control method thereof of utilizing heat pump, relate in particular to a heated type heat-pump hot-water of the dual system unit of a kind of constant temperature flow control methods for heat pump water-heating machine and this method of use.
Background technology
The high speed of the non-renewable and global reserves of " the fossil class energy " such as current coal, oil, natural gases reduces; brought global energy shortage; add going from bad to worse of ball ecological environment; make preserve the ecological environment, accelerate development and utilize regenerative resource, become human urgent and difficult task.Air-source heat pump hot water as energy-conserving and environment-protective has also obtained extensive approval, and the fine market prospects of energy-conserving product heat wetting system to tradition and also produced revolutionary alternative trend.The air source heat pump hot water product mainly contains heated type, circulation heated type, static heated type, heated type heat pump water-heating machine because install simple, the little engineering cost of engineering water lines caliber is low, cold water does not advance heat storage water tank and hot water is stable etc., and plurality of advantages is able to large-scale popularization.Chinese invention patent " a kind of plural serial stage waterway single heating type heat pump water heating machine " (Chinese invention patent ZL200710143443.6, Granted publication CN100501267C) a kind of plural serial stage waterway single heating type heat pump water heating machine is disclosed, formed by at least two relatively independent heat pumps and plural serial stage water system, in whole level (namely highest) heat pump, add condensed fluid cold-producing medium heat regenerator; Wherein: the water inlet of hot water unit is connected to the water inlet of this cold-producing medium heat regenerator, the delivery port of this cold-producing medium heat regenerator is connected to the condenser water inlet of first order heat pump, the condenser delivery port of first order heat pump is connected to the condenser water inlet of second level heat pump, by that analogy, until the whole condenser delivery port of level heat pump; The fluorine side-entrance of this cold-producing medium heat regenerator inserts the liquid refrigerant of the condenser discharge of level heat pump eventually, and the fluorine side outlet of this cold-producing medium heat regenerator is connected to the throttling arrangement import of level heat pump eventually.Chinese invention patent " heated type heat pump water-heating machine of a kind of ratio adjustment type " (Chinese invention patent ZL201110096160.7, publication number CN102162681A) heated type heat pump water-heating machine of a kind of ratio adjustment type is disclosed, heat storage water tank links to each other with the dual system condenser by pipeline, the dual system condenser is provided with two cover heatings, be respectively heating one and heating two, the top outlet of heating one links to each other by two-way electromagnetic valve with the lower part outlet of heating two, the lower part outlet of heating one links to each other with the top outlet of heating two, and the top outlet of heating two forms a loop by the lower part outlet of three-way magnetic valve and heating two; Heat storage water tank is provided with a water intaking valve, and water intaking valve links to each other with heat storage water tank by threeway ratio temperature control valve (TCV), is provided with water pump between threeway ratio temperature control valve (TCV) and three-way magnetic valve.This invention is by the environment-identification temperature, and the water system water route and connect the serial connection form that changes into, the discharge of two heatings doubles, and increases condensation effect, improves heating capacity and the efficiency of source pump, simultaneously unit can stablize again, the operation of safety.
But under numerous influence factors such as a refrigeration system damage or one of them leaving water temperature damage, the control logic existence of existing system is difficult to realize long-term safety, problem stable, that efficiently move in start, defrost, low ambient temperature, dual system.
Summary of the invention
The objective of the invention is to provide a kind of constant temperature flow control methods for a heated type heat-pump hot-water of dual system unit, solve the technical problem of using computer program to realize the constant temperature Flow-rate adjustment of a heated type heat-pump hot-water of dual system unit.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
A kind of heat pump water-heating machine constant temperature flow control methods is used for a heated type heat-pump hot-water of monolithic processor controlled dual system unit, it is characterized in that may further comprise the steps:
S100) read out coolant-temperature gage setting value Tws and water temperature return difference setting value Twd;
S160) detect the temperature of each temperature-sensing element in real time by the temperature signal collection processing module; Detect the on off state of each switching signal in real time by the switching signal acquisition processing module;
S180) prescribe a time limit when the heat storage water tank water level is lower than under the water level, according to the startup sequential requirement of source pump, open entering water electromagnetic valve, make the constant temperature flow valve be opened to initial opening, unit starting once heats operational mode;
S200) prescribe a time limit when water level is lower than under the water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once heat operational mode: call constant temperature flow valve pid algorithm, Tws is desired value with the leaving water temperature setting value, according to leaving water temperature detected value Tw control constant temperature flow valve aperture, regulate discharge, leaving water temperature Tw and leaving water temperature setting value Tws is consistent;
S380) when the water level of storage tank reached designated water level, unit was out of service;
S400) when water tank temperature Ts reduces because of heat radiation, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature Ts is lower than leaving water temperature setting value Tw-water temperature return difference setting value Twd, open constant temperature water pump, compressor, unit carries out temperature-constant operation, and after water tank temperature Ts reached leaving water temperature setting value Tws, unit withdrawed from the temperature-constant operation pattern;
S500) too high when inflow temperature, when leaving water temperature Tw exceeds the adjustable range of constant temperature flow valve, open by-passing valve; After leaving water temperature is reduced in the adjustable range of constant temperature flow valve, close by-passing valve.
A kind of preferable technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention is characterized in that the described constant temperature flow valve of step S300 pid algorithm may further comprise the steps:
S320) according to leaving water temperature Tw and delivery temperature Tp, determine delivery temperature correction value Δ Tp according to following condition:
If Tp＞Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp＜Tw+20, Δ Tp=-3;
S340) according to formula
△T=(Tw-Tws)+ΔTp；
Ks=S*△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is the leaving water temperature detected value, and Tws is the leaving water temperature setting value, and Tp is delivery temperature, and Δ Tp is the delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is the governing speed coefficient, S=10～20.
A kind of better technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention, it is characterized in that step S340 is according to the difference between leaving water temperature Tw and the leaving water temperature setting value Tws, change the governing speed of constant temperature flow valve, wherein, the governing speed coefficient S is determined according to following condition:
When 5＜△ T, S=20;
When-5≤△ T≤5, S=10;
When △ T＜-5, S=20.
A kind of optimized technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention is characterized in that also comprising the constant temperature mode of priority and once heats running priority model selection step:
S200) if select the temperature-constant operation mode of priority, then no matter the water level of water tank sets value Tws-water temperature return difference Twd as long as water tank temperature Ts is lower than leaving water temperature, unit changes the temperature-constant operation pattern immediately over to;
S220) if select once to heat the running priority pattern, no matter then how many water tank temperature Ts is, as long as water level is lower than the water level lower limit, unit changes over to immediately and once heats operational mode.
A kind of improved technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention is characterized in that also comprising the thermostatically controlled step of low ambient temperature:
S120) when environment temperature Th is lower than-5 ℃, leaving water temperature is set value Tws be adjusted into 40 ℃; Select the temperature-constant operation mode of priority, guarantee that water tank temperature Ts reaches design temperature.
The another kind of improved technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention is characterized in that also comprising dual system resultant fault state control step:
S140) judge the running status of heat pump A and heat pump B, when having a system fault that compressor can not open to occur in the dual system, leaving water temperature is set value Tws be adjusted into 40 ℃.
A kind of further improved technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention is characterized in that also comprising the process of defrost running status control, and described defrost running status control procedure may further comprise the steps:
S600) each system at a heated type heat-pump hot-water of dual system unit arranges two fin temperature sensors respectively, and the detected temperatures mean value of two fin temperature sensors of foundation is determined the defrost startup and withdrawed from temperature as fin temperature T c; When open circuit or short trouble appear in a fin temperature sensor, use the temperature of another fin temperature sensor detection as fin temperature T c, determine the defrost startup and withdraw from temperature;
S620) defrost entry condition:
When environment temperature Th＞15 ℃, unit does not enter defrost;
When 7 ℃＜environment temperature Th≤15 ℃,
During water tank temperature Ts＞45 ℃, unit does not enter defrost;
During water tank temperature Ts≤45 ℃, move after 90 minutes, reach 5 minutes if fin temperature T c continues to be lower than 0 ℃, then unit enters defrost;
When-2 ℃＜environment temperature Th≤7 ℃, move after 40 minutes, if continuing to be lower than-4 ℃, fin temperature T c reaches 5 minutes, then unit enters defrost;
When environment temperature Th≤-2 ℃, move after 30 minutes, if continuing to be lower than Th-3 ℃, fin temperature T c reaches 5 minutes, then unit enters defrost;
If environment temperature Th＜-2 ℃ and continue 120 minutes, unit does not also reach except the defrost entry condition, and then unit forces to enter defrost;
S640) defrost exit criteria:
When within 3 minutes defrost time, if fin temperature T c reaches 6 ℃, then withdraw from defrost;
When the defrost time is after 3 minutes, if fin temperature T c reaches 12 ℃, then withdraw from defrost;
Reach 10 minutes when the defrost time, then compulsory withdrawal defrost.
Another object of the present invention is that an a kind of heated type heat-pump hot-water of dual system unit that uses above-mentioned heat pump water-heating machine constant temperature flow control methods will be provided, and solves that unit is efficient under various operating modes, the problem of safety, stable operation.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
An a kind of heated type heat-pump hot-water of dual system unit that uses above-mentioned heat pump water-heating machine constant temperature flow control methods comprises heat pump A, heat pump B, water supply heating system C and constant temperature volume control device; Heat pump A and heat pump B comprise one group of compressor respectively, cross valve, and expansion valve, the air source heat pump that finned heat exchanger and gas-liquid separator connect to form is characterized in that:
Described water supply heating system comprises double-tube heat exchanger, entering water electromagnetic valve, constant temperature flow valve and constant temperature water pump; The running water entrance is connected to the cold water inlet of described double-tube heat exchanger successively by described entering water electromagnetic valve and constant temperature flow valve; Heat storage water tank is connected to the thermostatted water entrance of described double-tube heat exchanger by the constant temperature water inlet, and the thermostatted water outlet of described double-tube heat exchanger is connected to described heat storage water tank by the constant-temperature effluent mouth again, constitutes the thermostatted water closed circuit; Two ends at described constant temperature flow valve are connected in parallel to by-passing valve;
Described constant temperature volume control device comprises the Single-chip Controlling unit, one group of temperature-sensing element, one group of switching signal element and control signal output driver element;
Described temperature-sensing element comprises the exhaust gas temperature sensor be used to the delivery temperature Tp that obtains compressor, be used for obtaining the water tank temperature sensor of water tank temperature Ts, leaving water temperature sensor for the leaving water temperature Tw that obtains double-tube heat exchanger, for the fin temperature sensor of the fin temperature T c that obtains finned heat exchanger, and the environment temperature sensor that is used for obtaining environment temperature Th;
Described switching signal element comprises the cistern water level switch for detection of heat storage water tank water level upper and lower bound;
Source pump and ambient temperature signal are gathered by described temperature-sensing element in described Single-chip Controlling unit, gather the switching value status signal of described source pump by described switching signal element; Produce the control signal of entering water electromagnetic valve and compressor, according to delivery temperature Tp, leaving water temperature Tw and leaving water temperature setting value Tws, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve aperture control signal, according to water tank temperature Ts and leaving water temperature setting value Tws, produce the control signal of constant temperature water pump, produce the control signal of by-passing valve according to leaving water temperature Tw;
Described Single-chip Controlling unit is connected to compressor, entering water electromagnetic valve, constant temperature flow valve, by-passing valve and the constant temperature water pump of a heated type heat-pump hot-water of dual system unit by described control signal output driver element.
A kind of preferable technical scheme of a heated type heat-pump hot-water of dual system of the present invention unit, it is characterized in that described switching signal element also comprises low tension switch, high-voltage switch gear, hydraulic pressure switch, pressure differential detection valve, and heat pump A fault-signal and heat pump B fault-signal; Each switching value status signal of described switching signal element is gathered in described Single-chip Controlling unit, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, be used for adjusting the initial opening setting value of described constant temperature flow valve.
A kind of better technical scheme of a heated type heat-pump hot-water of dual system of the present invention unit, it is characterized in that on the finned heat exchanger of described heat pump A at a heated type heat-pump hot-water of dual system unit and heat pump B two fin temperature sensors being set respectively; Described Single-chip Controlling unit obtains the detected temperatures of two fin temperature sensors, with its mean value as fin temperature T c; If when open circuit or short trouble appear in a fin temperature sensor, then use the temperature of another fin temperature sensor detection as fin temperature T c; And according to environment temperature Th, water tank temperature Ts and fin temperature T c, sequential according to defrost requires to produce the defrosting control signal, via described control signal output driver element, be connected to the cross valve of heat-pump hot-water unit, control the source pump startup or withdraw from the defrost running status.
The invention has the beneficial effects as follows:
1, heat pump water-heating machine constant temperature flow control methods of the present invention and use the dual system unit of this method, by monolithic processor controlled constant temperature flow valve is set, carrying out discharge PID according to leaving water temperature regulates, adjustable range is wide, control is accurate, less scaling and obstruction, by obfuscation identification, intelligent control, guarantee under different operating modes can both cause the demand the rapidly hot water of temperature of source pump, when security of system is stable, have higher efficiency and heating capacity.
2, a heated type heat-pump hot-water of dual system of the present invention unit adopts the method for computer program control, its constant temperature flow valve pid algorithm can be according to the difference between leaving water temperature and the design temperature, change the governing speed of constant temperature flow valve, reach and reach the water outlet design temperature fast, can guarantee that again system and leaving water temperature are stable; Its defrost control method can guarantee that source pump can reasonably enter and withdraw from defrost, and defrost thoroughly, efficiently.
3, heat pump water-heating machine constant temperature flow control methods of the present invention and use the dual system unit of this method, different initial openings controls in the time of can realizing the changing environment temperature, when guaranteeing the unit start, initial opening is near the aperture of actual demand; Occur easily when solving low ambient temperature that condensation effect is bad, heating capacity is low, can heterodyne, the problem of the easy superpressure ratio of compressor, at present access the water design temperature by low ambient temperature, improve the condensation effect of source pump, improve heating capacity and the efficiency of source pump, can guarantee not superpressure ratio operation of compressor again.Simultaneously, by temperature-constant operation, guarantee that water tank temperature reaches design temperature.
4, heat pump water-heating machine constant temperature flow control methods of the present invention and use the dual system unit of this method, by the fault that occurs is carried out the synthesization analyzing and processing, a system in dual system breaks down when out of service, by downward modulation water outlet design temperature, guarantee the discharge of source pump, improve heating capacity and the efficiency of condensation effect and unit, thus guarantee another system that does not have fault can be safely, stable, efficiently move.
Description of drawings
Fig. 1 is to use the structural representation of a heated type heat-pump hot-water of dual system of the present invention unit;
Fig. 2 is the theory diagram of Single-chip Controlling unit of the constant temperature flow regulator of constant temperature flow valve;
Fig. 3 is the external interface circuit figure of Single-chip Controlling unit and control signal output driver element;
Fig. 4 is the constant temperature flow control methods flow chart of a heated type heat-pump hot-water of dual system unit;
Fig. 5 is the defrost control flow chart of the constant temperature flow control methods of a heated type heat-pump hot-water of dual system unit.
The label of each parts among the above figure: 1-compressor, 2-cross valve, 3-expansion valve, the 4-finned heat exchanger, 5-gas-liquid separator, 6-low tension switch, the 7-high-voltage switch gear, 8-hydraulic pressure switch, 9-pressure differential detection valve, the 10-double-tube heat exchanger, the 11-entering water electromagnetic valve, 12-constant temperature flow valve, 13-by-passing valve, 14-constant temperature water pump, 15-running water entrance, 16-constant temperature water inlet, 17-constant-temperature effluent mouth, 20-Single-chip Controlling unit, 21-temperature signal collection processing module, 22-switching signal acquisition processing module, 23-entering water electromagnetic valve control module, 24-source pump control module, 25-constant temperature flow valve aperture setting module, 26-constant temperature flow valve pid stream amount adjustment module, 27-constant temperature pump control module, the 28-bypass valve control module, 29-defrost mode control module, 30-control signal output driver element, A-heat pump A, B-heat pump B, C-water supply heating system.
The specific embodiment
In order to understand technique scheme of the present invention better, describe in detail further below in conjunction with drawings and Examples.
Fig. 1 is to use an embodiment of a heated type heat-pump hot-water of the dual system unit of constant temperature flow regulator of the present invention, and a heated type heat-pump hot-water of described dual system unit comprises heat pump A, heat pump B and water supply heating system C; Heat pump A and heat pump B comprise one group of compressor 1 respectively, cross valve 2, expansion valve 3, the air source heat pump that finned heat exchanger 4 and gas-liquid separator 5 connect to form; Water supply heating system C comprises double-tube heat exchanger 10, entering water electromagnetic valve 11, constant temperature flow valve 12 and constant temperature water pump 14; Running water entrance 15 is connected to the cold water inlet of double-tube heat exchanger 10 successively by entering water electromagnetic valve 11 and constant temperature flow valve 12; The heat storage water tank (not shown) is connected to the thermostatted water entrance of double-tube heat exchanger 10 by constant temperature water inlet 16, and the thermostatted water outlet of double-tube heat exchanger 10 is connected to heat storage water tank by constant-temperature effluent mouth 17 again, constitutes the thermostatted water closed circuit; Be connected in parallel to by-passing valve 13 at the two ends of constant temperature flow valve 12.
Fig. 2 and Fig. 3 have showed an embodiment of the constant temperature flow regulator of a heated type heat-pump hot-water of dual system of the present invention unit, comprise 20, the one groups of temperature-sensing elements in Single-chip Controlling unit, one group of switching signal element and control signal output driver element 30;
Described temperature-sensing element comprises exhaust gas temperature sensor, is used for obtaining the delivery temperature Tp of compressor 1; The water tank temperature sensor is used for obtaining water tank temperature Ts; The leaving water temperature sensor is for the leaving water temperature Tw that obtains double-tube heat exchanger 10; The fin temperature sensor, for the fin temperature T c that obtains finned heat exchanger 4, and environment temperature sensor, be used for obtaining environment temperature Th;
Described switching signal element comprises the cistern water level switch for detection of heat storage water tank water level upper and lower bound, is used for the pressure switch signal of source pump overvoltage or under-voltage protection, and the control panel switch that is used for the control unit operation; Fig. 1 and Fig. 2 omitted temperature-sensing element and part switching signal element and and control module between line;
Single-chip Controlling unit 20 is connected to the compressor 1 of a heated type heat-pump hot-water of dual system unit, entering water electromagnetic valve 11, constant temperature flow valve 12, by-passing valve 13 and constant temperature water pump 14 by control signal output driver element 30;
An embodiment of Single-chip Controlling unit 20 comprises as shown in Figure 2:
Temperature signal collection processing module 21 is used for gathering source pump and environment temperature by described temperature-sensing element;
Switching signal acquisition processing module 22 is used for the switching value status signal by described switching signal element collection source pump;
Entering water electromagnetic valve control module 23 and source pump control module 24, be connected to the output of switching signal acquisition processing module 22, according to heat storage water tank water level upper and lower bound signal, according to the startup sequential requirement of source pump, produce the control signal of entering water electromagnetic valve 11 and compressor 1;
Constant temperature flow valve aperture setting module 25 and constant temperature flow valve pid stream amount adjustment module 26, be connected to the output of temperature signal collection processing module 21, according to delivery temperature Tp, leaving water temperature Tw and leaving water temperature setting value Tws, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve aperture control signal;
Constant temperature pump control module 27 is connected to the output of temperature signal collection processing module 21, according to water tank temperature Ts and leaving water temperature setting value Tws, produces the control signal of constant temperature water pump 14;
Bypass valve control module 28 is connected to the output of temperature signal collection processing module 21, produces the control signal of by-passing valve 13 according to leaving water temperature Tw.
According to the embodiment of Fig. 1 to a heated type heat-pump hot-water of dual system of the present invention unit shown in Figure 3, described switching signal element also comprises low tension switch 6, high-voltage switch gear 7, hydraulic pressure switch 8, pressure differential detection valve 9, and heat pump A fault-signal and heat pump B fault-signal; Single-chip Controlling unit 20 is by switching signal acquisition processing module 22, gather each switching value status signal of described switching signal element, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, send constant temperature flow valve aperture setting module 25 to.
According to another embodiment of a heated type heat-pump hot-water of dual system of the present invention unit, on the finned heat exchanger 4 of the heat pump A of a heated type heat-pump hot-water of dual system unit and heat pump B, two fin temperature sensors are set respectively; Single-chip Controlling unit 20 also comprises defrost control module 29; Temperature signal collection processing module 21 is obtained the detected temperatures of two fin temperature sensors, with its mean value as fin temperature T c; If when open circuit or short trouble appear in a fin temperature sensor, then use the temperature of another fin temperature sensor detection as fin temperature T c; Defrost control module 29 is connected to the output of temperature signal collection processing module 21, according to environment temperature Th, water tank temperature Ts and fin temperature T c, sequential according to defrost requires to produce the defrosting control signal, via control signal output driver element 30, be connected to the cross valve 2 of heat-pump hot-water unit, control the source pump startup or withdraw from the defrost running status.
An embodiment according to a heated type heat-pump hot-water of dual system of the present invention unit, Single-chip Controlling unit 20 and control signal output driver element 30 are assembled in the housing of control device, constitute an independently heated type heat-pump hot-water of dual system unit constant temperature flow regulator, configuration has the Man Machine Interface 40 of keyboard display floater on the described housing, setting and the monitoring of heat-pump hot-water unit carried out in Single-chip Controlling unit 20 by Man Machine Interface 40, for example, by keyboard input leaving water temperature setting value Tws, show water temperature and operating states of the units by display floater.
Another embodiment according to a heated type heat-pump hot-water of dual system of the present invention unit, described Single-chip Controlling unit 20 also comprises the control bus interface module, for example, Modbus protocol bus interface module, the constant temperature flow regulator is by the control bus interface module, be connected to the master control system of a heated type heat-pump hot-water of dual system unit, realize centralized Control and remote monitoring function, for example, set out coolant-temperature gage setting value Tws by remote monitoring terminal, show water temperature and operating states of the units.
Fig. 4 is the flow chart of heat pump water-heating machine constant temperature flow control methods of the present invention, the flow chart of present embodiment has only comprised the basic step that realizes the constant temperature flow rate adjusting method, has omitted the required well-known routines steps of process such as microsystem computer software and hardware power-up initializing that those skilled in the art were familiar with.
Use Single-chip Controlling of the present invention shown in Figure 4 realizes that the embodiment of the method for constant temperature Flow-rate adjustment may further comprise the steps:
S100) read out coolant-temperature gage setting value Tws and water temperature return difference setting value Twd;
S120) when environment temperature Th is lower than-5 ℃, leaving water temperature is set value Tws be adjusted into 40 ℃; Select the temperature-constant operation mode of priority, guarantee that water tank temperature Ts reaches design temperature; The present invention is by when low ambient temperature, downward modulation leaving water temperature setting value Tws, improve the condensation effect of source pump, improve heating capacity and the efficiency of source pump, occur easily when solving low ambient temperature that condensation effect is bad, heating capacity is low, can heterodyne, the problem of the easy superpressure ratio of compressor.Simultaneously, by the temperature-constant operation pattern, guarantee that water tank temperature reaches the leaving water temperature setting value.Thereby the heating effect of the system of assurance.
S140) judge the running status of heat pump A and heat pump B, when having a system fault that compressor can not open to occur in the dual system, leaving water temperature is set value Tws be adjusted into 40 ℃; The present invention gathers each switching value status signal of dual system source pump by the switching signal acquisition processing module, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, then according to the fault that occurs is carried out the comprehensive analysis processing result, at present access coolant-temperature gage setting value Tws by breaking down at triangular web, guarantee the discharge of source pump, improve heating capacity and the efficiency of condensation effect and unit, thus guarantee another system that does not have fault can be safely, stable, efficiently move.
S160) detect the temperature of each temperature-sensing element in real time by the temperature signal collection processing module; Detect the on off state of each switching signal in real time by the switching signal acquisition processing module;
S180) prescribe a time limit when the heat storage water tank water level is lower than under the water level, according to the startup sequential requirement of source pump, open entering water electromagnetic valve, make the constant temperature flow valve be opened to initial opening, unit starting once heats operational mode.Source pump starts an embodiment of the control sequential that once heats operational mode: entering water electromagnetic valve is opened, and delays time 3 seconds, and the constant temperature flow valve is opened to initial opening, and rear fan, compressor were opened in 10 seconds, and constant temperature flow valve initial opening remains unchanged in 60 seconds.
S200) prescribe a time limit when water level is lower than under the water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once heat operational mode: call constant temperature flow valve pid algorithm, Tws is desired value with the leaving water temperature setting value, according to leaving water temperature detected value Tw control constant temperature flow valve aperture, regulate discharge, leaving water temperature Tw and leaving water temperature setting value Tws is consistent;
S380) when the water level of storage tank reached designated water level, unit was out of service;
S400) when water tank temperature Ts reduces because of heat radiation, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature Ts is lower than leaving water temperature setting value Tw-water temperature return difference setting value Twd, open constant temperature water pump, compressor, unit carries out temperature-constant operation, after water tank temperature Ts reaches leaving water temperature setting value Tws, unit withdraws from the temperature-constant operation pattern, turns to step S380;
S500) too high when inflow temperature, when leaving water temperature Tw exceeds the adjustable range of constant temperature flow valve, open by-passing valve; After leaving water temperature is reduced in the adjustable range of constant temperature flow valve, close by-passing valve.According to embodiments of the invention shown in Figure 4, the preferred adjustable range of constant temperature flow valve is 65 ℃≤Tw≤55 ℃, that is to say, when leaving water temperature Tw surpasses 65 ℃, open by-passing valve, increase the unit flow of inlet water, thereby reduce leaving water temperature Tw, improve the efficiency of source pump, when leaving water temperature Tw is reduced to 55 ℃, close by-passing valve.
According to the embodiment of heat pump water-heating machine constant temperature flow control methods shown in Figure 4, the described constant temperature flow valve of step S300 pid algorithm may further comprise the steps:
S320) according to leaving water temperature Tw and delivery temperature Tp, determine delivery temperature correction value Δ Tp according to following condition:
If Tp＞Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp＜Tw+20, Δ Tp=-3;
S340) according to formula
△T=(Tw-Tws)+ΔTp；
Ks=S*△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is the leaving water temperature detected value, and Tws is the leaving water temperature setting value, and Tp is delivery temperature, and Δ Tp is the delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is the governing speed coefficient, S=10～20.
Step S340 changes the governing speed of constant temperature flow valve according to the difference between leaving water temperature Tw and the leaving water temperature setting value Tws, and wherein, the governing speed coefficient S is determined according to following condition:
When 5＜△ T, S=20;
When-5≤△ T≤5, S=10;
When △ T＜-5, S=20.
In heat pump water-heating machine constant temperature flow control methods provided by the invention shown in Figure 4, also comprise the constant temperature mode of priority and once heat running priority model selection step:
S200) if select the temperature-constant operation mode of priority, then no matter the water level of water tank sets value Tws-water temperature return difference Twd as long as water tank temperature Ts is lower than leaving water temperature, unit changes the temperature-constant operation pattern immediately over to;
S220) if select once to heat the running priority pattern, no matter then how many water tank temperature Ts is, as long as water level is lower than the water level lower limit, unit changes over to immediately and once heats operational mode.
Another embodiment according to heat pump water-heating machine constant temperature flow control methods of the present invention, the process that also comprises the defrost running status control that produces the defrost clock signal, guaranteeing that dual system heat-pump hot-water unit can reasonably start and withdraws from the defrost running status, and defrost thoroughly, efficient.Defrost running status control procedure may further comprise the steps as shown in Figure 5:
S600) each system at a heated type heat-pump hot-water of dual system unit arranges two fin temperature sensors respectively, and the detected temperatures mean value of two fin temperature sensors of foundation is determined the defrost startup and withdrawed from temperature as fin temperature T c; When open circuit or short trouble appear in a fin temperature sensor, use the temperature of another fin temperature sensor detection as fin temperature T c, determine the defrost startup and withdraw from temperature;
S620) defrost entry condition:
When environment temperature Th＞15 ℃, unit does not enter defrost;
When 7 ℃＜environment temperature Th≤15 ℃,
During water tank temperature Ts＞45 ℃, unit does not enter defrost;
During water tank temperature Ts≤45 ℃, move after 90 minutes, reach 5 minutes if fin temperature T c continues to be lower than 0 ℃, then unit enters defrost;
When-2 ℃＜environment temperature Th≤7 ℃, move after 40 minutes, if continuing to be lower than-4 ℃, fin temperature T c reaches 5 minutes, then unit enters defrost;
When environment temperature Th≤-2 ℃, move after 30 minutes, if continuing to be lower than Th-3 ℃, fin temperature T c reaches 5 minutes, then unit enters defrost;
If environment temperature Th＜-2 ℃ and continue 120 minutes, unit does not also reach except the defrost entry condition, and then unit forces to enter defrost.
S640) defrost exit criteria:
When within 3 minutes defrost time, if fin temperature T c reaches 6 ℃, then withdraw from defrost;
When the defrost time is after 3 minutes, if fin temperature T c reaches 12 ℃, then withdraw from defrost;
Reach 10 minutes when the defrost time, then compulsory withdrawal defrost.
Those of ordinary skill in the art will be appreciated that; above embodiment illustrates technical scheme of the present invention; and be not to be used as limitation of the invention; any variation, modification of the above embodiment being done based on connotation of the present invention all will drop in the protection domain of claim of the present invention.
Claims (10)
1. a heat pump water-heating machine constant temperature flow control methods is used for a heated type heat-pump hot-water of monolithic processor controlled dual system unit, it is characterized in that may further comprise the steps:
S100) read out coolant-temperature gage setting value and water temperature return difference setting value;
S160) detect the temperature of each temperature-sensing element in real time by the temperature signal collection processing module; Detect the on off state of each switching signal in real time by the switching signal acquisition processing module;
S180) prescribe a time limit when the heat storage water tank water level is lower than under the water level, according to the startup sequential requirement of source pump, open entering water electromagnetic valve, make the constant temperature flow valve be opened to initial opening, unit starting once heats operational mode;
S200) prescribe a time limit when water level is lower than under the water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once heat operational mode: calling constant temperature flow valve pid algorithm, is desired value with the leaving water temperature setting value, according to leaving water temperature detected value control constant temperature flow valve aperture, regulates discharge, and leaving water temperature and leaving water temperature setting value is consistent;
S380) when the water level of storage tank reached designated water level, unit was out of service;
S400) when water tank temperature reduces because of heat radiation, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature is lower than leaving water temperature setting value-water temperature return difference setting value, open constant temperature water pump, compressor, unit carries out temperature-constant operation, and after water tank temperature reached the leaving water temperature setting value, unit withdrawed from the temperature-constant operation pattern;
S500) too high when inflow temperature, when leaving water temperature exceeds the adjustable range of constant temperature flow valve, open by-passing valve; After leaving water temperature is reduced in the adjustable range of constant temperature flow valve, close by-passing valve.
2. heat pump water-heating machine constant temperature flow control methods according to claim 1 is characterized in that the described constant temperature flow valve of step S300 pid algorithm may further comprise the steps:
S320) according to leaving water temperature and delivery temperature, determine the delivery temperature correction value according to following condition:
If Tp＞Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp＜Tw+20, Δ Tp=-3;
S340) according to formula
△T=(Tw-Tws)+ΔTp；
Ks=S*△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is the leaving water temperature detected value, and Tws is the leaving water temperature setting value, and Tp is delivery temperature, and Δ Tp is the delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is the governing speed coefficient, S=10～20.
3. heat pump water-heating machine constant temperature flow control methods according to claim 2, it is characterized in that step S340 is according to the difference between leaving water temperature and the leaving water temperature setting value, change the governing speed of constant temperature flow valve, wherein, the governing speed coefficient S is determined according to following condition:
When 5＜△ T, S=20;
When-5≤△ T≤5, S=10;
When △ T＜-5, S=20.
4. according to claim 1,2 or 3 described heat pump water-heating machine constant temperature flow control methods, it is characterized in that also comprising the constant temperature mode of priority and once heat running priority model selection step:
S200) if select the temperature-constant operation mode of priority, then no matter the water level of water tank needs only water tank temperature and is lower than leaving water temperature setting value-water temperature return difference, unit changes the temperature-constant operation pattern immediately over to;
S220) if select once to heat the running priority pattern, no matter then how many water tank temperatures is, as long as water level is lower than the water level lower limit, unit changes over to immediately and once heats operational mode.
5. according to claim 1,2 or 3 described heat pump water-heating machine constant temperature flow control methods, it is characterized in that also comprising the thermostatically controlled step of low ambient temperature:
S120) when environment temperature is lower than-5 ℃, the leaving water temperature setting value is adjusted into 40 ℃; Select the temperature-constant operation mode of priority, guarantee that water tank temperature reaches design temperature.
6. according to claim 1,2 or 3 described heat pump water-heating machine constant temperature flow control methods, it is characterized in that also comprising dual system resultant fault state control step:
S140) judge the running status of heat pump A and heat pump B, when having a system fault that compressor can not open to occur in the dual system, the leaving water temperature setting value is adjusted into 40 ℃.
7. according to claim 1,2 or 3 described heat pump water-heating machine constant temperature flow control methods, it is characterized in that also comprising the process of defrost running status control, described defrost running status control procedure may further comprise the steps:
S600) each system at a heated type heat-pump hot-water of dual system unit arranges two fin temperature sensors respectively, and the detected temperatures mean value of two fin temperature sensors of foundation is determined the defrost startup and withdrawed from temperature as the fin temperature; When open circuit or short trouble appear in a fin temperature sensor, use the temperature of another fin temperature sensor detection as the fin temperature, determine the defrost startup and withdraw from temperature;
S620) defrost entry condition:
When environment temperature＞15 ℃, unit does not enter defrost;
When 7 ℃＜environment temperature≤15 ℃,
During water tank temperature＞45 ℃, unit does not enter defrost;
During water tank temperature≤45 ℃, move after 90 minutes, reach 5 minutes if the fin temperature continues to be lower than 0 ℃, then unit enters defrost;
When-2 ℃＜environment temperature≤7 ℃, move after 40 minutes, if continuing to be lower than-4 ℃, the fin temperature reaches 5 minutes, then unit enters defrost;
When environment temperature≤-2 ℃, move after 30 minutes, if continuing to be lower than environment temperature-3, fin temperature T c ℃ reaches 5 minutes, then unit enters defrost;
If environment temperature＜-2 ℃ and continue 120 minutes, unit does not also reach except the defrost entry condition, and then unit forces to enter defrost;
S640) defrost exit criteria:
When within 3 minutes defrost time, if the fin temperature reaches 6 ℃, then withdraw from defrost;
When the defrost time is after 3 minutes, if the fin temperature reaches 12 ℃, then withdraw from defrost;
Reach 10 minutes when the defrost time, then compulsory withdrawal defrost.
8. a heated type heat-pump hot-water of the dual system unit of the heat pump water-heating machine constant temperature flow control methods of arbitrary claim of a right to use requirement 1 to 7 comprises heat pump A, heat pump B, water supply heating system C and constant temperature volume control device; Heat pump A and heat pump B comprise one group of compressor respectively, cross valve, and expansion valve, the air source heat pump that finned heat exchanger and gas-liquid separator connect to form is characterized in that:
Described water supply heating system comprises double-tube heat exchanger, entering water electromagnetic valve, constant temperature flow valve and constant temperature water pump; The running water entrance is connected to the cold water inlet of described double-tube heat exchanger successively by described entering water electromagnetic valve and constant temperature flow valve; Heat storage water tank is connected to the thermostatted water entrance of described double-tube heat exchanger by the constant temperature water inlet, and the thermostatted water outlet of described double-tube heat exchanger is connected to described heat storage water tank by the constant-temperature effluent mouth again, constitutes the thermostatted water closed circuit; Two ends at described constant temperature flow valve are connected in parallel to by-passing valve;
Described constant temperature volume control device comprises the Single-chip Controlling unit, one group of temperature-sensing element, one group of switching signal element and control signal output driver element;
Described temperature-sensing element comprises the exhaust gas temperature sensor be used to the delivery temperature of obtaining compressor, be used for obtaining the water tank temperature sensor of water tank temperature, leaving water temperature sensor for the leaving water temperature that obtains double-tube heat exchanger, for the fin temperature sensor of the fin temperature of obtaining finned heat exchanger, and the environment temperature sensor that is used for obtaining environment temperature;
Described switching signal element comprises the cistern water level switch for detection of heat storage water tank water level upper and lower bound;
Source pump and ambient temperature signal are gathered by described temperature-sensing element in described Single-chip Controlling unit, gather the switching value status signal of described source pump by described switching signal element; Produce the control signal of entering water electromagnetic valve and compressor, according to delivery temperature, leaving water temperature and leaving water temperature setting value, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve aperture control signal, according to water tank temperature and leaving water temperature setting value, produce the control signal of constant temperature water pump, produce the control signal of by-passing valve according to leaving water temperature;
Described Single-chip Controlling unit is connected to compressor, entering water electromagnetic valve, constant temperature flow valve, by-passing valve and the constant temperature water pump of a heated type heat-pump hot-water of dual system unit by described control signal output driver element.
9. a heated type heat-pump hot-water of dual system according to claim 8 unit, it is characterized in that described switching signal element also comprises low tension switch, high-voltage switch gear, hydraulic pressure switch, pressure differential detection valve, and heat pump A fault-signal and heat pump B fault-signal; Each switching value status signal of described switching signal element is gathered in described Single-chip Controlling unit, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, be used for adjusting the initial opening setting value of described constant temperature flow valve.
10. a heated type heat-pump hot-water of dual system according to claim 8 unit, it is characterized in that on the finned heat exchanger of described heat pump A at a heated type heat-pump hot-water of dual system unit and heat pump B two fin temperature sensors being set respectively; Described Single-chip Controlling unit obtains the detected temperatures of two fin temperature sensors, with its mean value as the fin temperature; If when open circuit or short trouble appear in a fin temperature sensor, then use the temperature of another fin temperature sensor detection as the fin temperature; And according to environment temperature, water tank temperature and fin temperature, sequential according to defrost requires to produce the defrosting control signal, via described control signal output driver element, be connected to the cross valve of heat-pump hot-water unit, control the source pump startup or withdraw from the defrost running status.
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