CN112781233A - Control method and system for space energy heat pump water heater - Google Patents
Control method and system for space energy heat pump water heater Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 40
- 238000001704 evaporation Methods 0.000 claims abstract description 21
- 230000008020 evaporation Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims 1
- 238000013021 overheating Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a control method and a system of a space energy heat pump water heater, wherein the space energy heat pump water heater comprises a main pipeline connected between an outlet of a condenser and an inlet of an evaporator and an auxiliary pipeline connected between an outlet of the condenser and an outlet of the evaporator, a main throttling element is arranged in the main pipeline, and an auxiliary throttling element is arranged in the auxiliary pipeline, and the control method comprises the following steps: detecting the opening degree of a main throttling element, and acquiring the suction superheat degree delta Ts and the exhaust superheat degree delta Tp of the compressor when the opening degree of the main throttling element is maximum; and when the suction superheat degree delta Ts is larger than or equal to T11 and the exhaust superheat degree delta Tp is larger than or equal to T12, the auxiliary throttling element is opened. According to the method, when evaporation overheating occurs, the auxiliary pipeline is controlled to be opened, one path of refrigerant is subjected to throttling cooling through the auxiliary pipeline, the other path of refrigerant is evaporated through the evaporator, the evaporation overheating refrigerant and the low-temperature refrigerant after the auxiliary pipeline is throttled are mixed and sucked into the compressor, so that the suction temperature is reduced, the exhaust of the compressor is reduced, and the unit is more reliable in operation.
Description
Technical Field
The invention belongs to the technical field of heat pumps, and particularly relates to a control method and a control system of a space energy heat pump water heater.
Background
A heat pump water heater or an air conditioning system is provided with a fan device, and the evaporator evaporation effect is controlled by downshifting or decelerating the fan or even controlling the start and stop of the fan, so that the evaporation superheat degree is controlled in a reasonable range, and the excessive exhaust is prevented.
At present, some space energy (solar energy and air energy) heat pump water heaters omit a fan, can save cost, and mainly carry out heat exchange by coating a coating for absorbing sunlight on fins and naturally convecting with air through finned tubes.
Under the condition of strong illumination or high ambient temperature with high outdoor wind speed, the heat exchange of the evaporator is too sufficient, the condition of evaporation overheating occurs, the suction temperature of the compressor is high, the exhaust temperature is high and reaches a protection temperature value, and the exhaust overheating fault is reported.
Disclosure of Invention
The invention provides a control method of a space energy heat pump water heater, which aims at solving the problems that in the prior art, the air flow rate cannot be controlled by the evaporator of the space energy heat pump water heater through heat exchange by natural air flow, and the damage or frequent failure reporting is easily caused by overhigh exhaust temperature of a compressor due to evaporation and overheating.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a control method of a space energy heat pump water heater comprises a main pipeline connected between an outlet of a condenser and an inlet of an evaporator and an auxiliary pipeline connected between an outlet of the condenser and an outlet of the evaporator, wherein a main throttling element is arranged in the main pipeline, and an auxiliary throttling element is arranged in the auxiliary pipeline, and the control method comprises the following steps:
detecting the opening degree of a main throttling element, and acquiring the suction superheat degree delta Ts and the exhaust superheat degree delta Tp of the compressor when the opening degree of the main throttling element is maximum;
when the suction superheat degree delta Ts is more than or equal to T11 and the exhaust superheat degree delta Tp is more than or equal to T12, opening the auxiliary throttling element, wherein T11 is more than or equal to 4 ℃ and less than or equal to 10 ℃; t12 is more than or equal to 30 ℃ and less than or equal to 38 ℃.
Further, after the opening of the secondary throttling element, the method comprises the following steps:
when the exhaust superheat degree delta Tp is larger than or equal to T12, adjusting the opening of the auxiliary throttling element by adopting the exhaust superheat degree;
when the exhaust superheat degree delta Tp is less than T12, the auxiliary throttling element keeps the existing opening degree, and the opening degree of the main throttling element is adjusted by adopting the suction superheat degree.
Further, the method for adjusting the opening degree of the auxiliary throttling element comprises the following steps:
calculating a target opening P of the secondary restriction elementi+1；
Wherein, Pi+1= Pi+ΔP；
ΔP=ΔTp-ΔT；
PiIs the current opening degree of the auxiliary throttling element;
Δ T is the target exhaust superheat.
Further, the method for determining the target exhaust superheat degree Δ T comprises the following steps:
when the refrigerant is R134 a: Δ T =20 ℃;
when the refrigerant is R22: Δ T =25 ℃;
when the refrigerant is R410A: Δ T =28 ℃.
Further, the method for calculating the exhaust superheat degree delta Tp of the compressor comprises the following steps:
detecting a compressor discharge temperature T5;
the detection temperature T6;
detecting an ambient temperature T7;
ΔTp= T5-[(a1×T7+a2)×T6+a3×T7+a4]；
wherein a1, a2, a3 and a4 are constant coefficients.
Further, the method for adjusting the opening degree of the main throttling element comprises the following steps:
detecting the suction temperature T3 of the compressor;
detecting the evaporation temperature T4;
adjusting the main throttling element to a target opening Xi + 1;
Xi+1=Xi+ΔX；
ΔX=(T3-T4)-Δt；
wherein Xi is the current opening degree of the main throttling element;
Δ t is the target suction superheat.
Further, the method for determining the target degree of superheat Δ t of intake air is as follows:
detecting a compressor discharge temperature T5;
Δ T = T1 when T5 > b 1;
when b1 is more than or equal to T5 > b2, delta T = T2;
when b2 is more than or equal to T5 > b3, delta T = T3;
when b3 is more than or equal to T5 > b4, delta T = T4;
when b4 is more than or equal to T5, delta T = T5;
wherein, the temperature is more than or equal to 100 ℃ and more than b1, b2, b3, b4 and more than 30 ℃, t1 is more than 0 and more than t2 and more than t3 and more than t4 and more than t 5.
The invention also provides a space energy heat pump water heater control system which comprises an evaporator, a compressor, a condenser and a water tank, wherein the control system executes control according to any one of the control methods.
Furthermore, the main throttling element and the auxiliary throttling element are electronic expansion valves with adjustable opening degrees respectively.
Further, the control system further includes:
an evaporation temperature sensor for detecting an evaporator temperature;
a suction temperature sensor for detecting a compressor suction temperature;
an exhaust temperature sensor for detecting a compressor exhaust temperature;
a tank temperature sensor for detecting a temperature of water in the tank.
Compared with the prior art, the invention has the advantages and positive effects that: through setting up the auxiliary line of connection between the export of condenser and the export of evaporimeter, when appearing evaporating overheat, the auxiliary line is opened, and the refrigerant is the throttle cooling through the auxiliary line all the way, and another way is through the evaporimeter evaporation, and the evaporating overheat refrigerant mixes with the low temperature refrigerant of auxiliary line throttle back and gathers and inhales the compressor to reduce the temperature of breathing in and then reduce the compressor and exhaust, make the unit operation more reliable.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a space energy heat pump water heater control system according to the present invention;
FIG. 2 is a flow chart of an embodiment of a method for controlling a space energy heat pump water heater provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Example one
The embodiment provides a control method of a space energy heat pump water heater, which can utilize solar energy and air energy to produce hot water, and as shown in fig. 1, the control method comprises a compressor 11, a condenser 12 and an evaporator 13, a main pipeline 14 is connected between an outlet of the condenser 11 and an inlet of the evaporator 13, an auxiliary pipeline 15 is connected between an outlet of the condenser 11 and an outlet of the evaporator 13, a main throttling element 16 is arranged in the main pipeline 14, and an auxiliary throttling element 17 is arranged in the auxiliary pipeline 15, as shown in fig. 2, the control method of the space energy heat pump water heater of the embodiment comprises the following steps:
detecting the opening degree of the main throttling element 16, and acquiring the suction superheat degree delta Ts and the exhaust superheat degree delta Tp of the compressor 11 when the opening degree of the main throttling element 16 is maximum;
when the heat pump system operates, a high-temperature and high-pressure refrigerant discharged by a compressor 11 enters a condenser 12, heat is released in the condenser 11 to heat water in a water tank, a low-temperature refrigerant is throttled and depressurized by a main throttling element 16 of a main pipeline 14, and then enters an evaporator 13 to absorb heat again to form a gaseous refrigerant to circulate to the compressor 11, when the outdoor solar radiation intensity is stronger, the air temperature is higher, or the wind speed is higher, the heat exchange efficiency of the evaporator 13 is high, the evaporation overheating occurs, the pressure of the refrigerant going out from the evaporator 13 is higher, after the refrigerant enters the compressor 11, the exhaust pressure of the compressor 11 is too high, the shutdown or frequent alarm is caused, and the like, the current main adjusting mode is that more refrigerants enter the evaporator 13 to exchange heat by increasing the opening degree of the main throttling element 16 to reduce the pressure of the evaporator 13, but the opening degree of the main throttling element 16 cannot be increased infinitely, thus, when it is detected that the opening of the primary throttling element 16 has reached a maximum, this indicates that the ability of the system to automatically adjust has reached a limit. If further regulation of the depressurization is required, additional measures must be taken.
When the opening degree of the main throttling element 16 reaches the maximum, two conditions occur, one is that the pressure of the refrigerant can be reduced to a safe range, and at the moment, no further auxiliary pressure reduction measures need to be taken. And the other is that the pressure still exceeds a safe range, and an auxiliary pressure reduction measure needs to be further taken.
When the suction superheat degree delta Ts is more than or equal to T11 and the exhaust superheat degree delta Tp is more than or equal to T12, the auxiliary throttling element 17 is opened, wherein T11 is more than or equal to 4 ℃ and less than or equal to 10 ℃; t12 is more than or equal to 30 ℃ and less than or equal to 38 ℃.
In the scheme, the suction superheat degree delta Ts and the exhaust superheat degree delta Tp of the compressor 11 are calculated, when the suction superheat degree delta Ts and the exhaust superheat degree delta Tp exceed a safety set value, the temperature needs to be further reduced, the auxiliary throttling element 17 is opened, one path of low-temperature refrigerant from the condenser 12 enters the auxiliary pipeline 15, the low-temperature refrigerant is throttled and depressurized by the auxiliary throttling element 17 and then mixed with high-temperature refrigerant from the evaporator 13, the temperature and the pressure of the mixed refrigerant are reduced, and the mixed refrigerant returns to the compressor 11.
According to the control method of the space energy heat pump water heater, the auxiliary pipeline 15 connected between the outlet of the condenser 12 and the outlet of the evaporator 13 is arranged, when evaporation overheating occurs, the auxiliary pipeline 15 is opened, one path of refrigerant is throttled and cooled through the auxiliary pipeline 15, the other path of refrigerant is evaporated through the evaporator 13, the evaporation overheating refrigerant and the low-temperature refrigerant after the auxiliary pipeline 15 is throttled are mixed and sucked into the compressor 11 in a gathering mode, accordingly, the air suction temperature is reduced, the exhaust of the compressor is reduced, and the unit operation is more reliable.
The auxiliary throttling element 17 plays a role in controlling the bypass and throttling of the auxiliary pipeline 15, the flow rate of a refrigerant in the auxiliary pipeline 15 is controlled, the throttling caliber of the auxiliary throttling element is smaller than that of the main throttling element 16, the model selection specification is below 1kW, and no refrigerant flows in the auxiliary pipeline 15 when the opening degree of the valve is adjusted to 0 step. The primary throttling element 16 and the secondary throttling element 17 may be implemented as electronic expansion valves.
The space energy heat pump water heater in this embodiment should also have an intake air temperature sensor 18, an exhaust air temperature sensor 19, a tank temperature sensor 20, an evaporation temperature sensor 21, and an ambient temperature sensor 22, the intake air temperature sensor 18 being fixed on the intake pipe of the compressor 11 for detecting the compressor intake air temperature T3. The evaporation temperature sensor 21 is fixed to the capillary tube for liquid separation of the evaporator 13 or to a U-shaped tube of the evaporator 13, and the temperature thereof is close to the temperature corresponding to the evaporation pressure of the evaporator 13, so that the detected temperature is equivalent to the evaporation temperature T4. The discharge temperature sensor 19 is fixed to a discharge pipe of the compressor 11 and detects a compressor discharge temperature T5. The tank temperature sensor 20 is fixed in the water tank 23 for detecting the temperature of water in the water tank 23, i.e., a tank temperature T6. The ambient temperature sensor 22 is fixed to the windward side finned tube of the evaporator 13 by a bracket (not shown) without contacting the finned tube.
After the auxiliary throttling element 17 is opened, it comprises:
when the exhaust superheat degree delta Tp is larger than or equal to T12, the exhaust superheat degree is adopted to adjust the opening degree of the auxiliary throttling element 17, and meanwhile, the maximum opening degree of the main throttling element 16 is kept.
When the exhaust superheat degree delta Tp is less than T12, the auxiliary throttling element 17 keeps the prior opening degree, and the opening degree of the main throttling element 16 is adjusted by adopting the suction superheat degree. T12 is safe exhaust superheat value, and is related to refrigerant type, and has T12 value of 15 deg.C for R134a refrigerant, T12 value of 18 deg.C for R22 refrigerant, and T12 value of 20 deg.C for R410A refrigerant
The method for adjusting the opening degree of the auxiliary throttling element 17 comprises the following steps:
calculating a target opening P of the secondary restriction elementi+1；
Wherein, Pi+1= Pi+ΔP；
ΔP=ΔTp-ΔT；
PiIs the current opening degree of the auxiliary throttling element;
Δ T is the target exhaust superheat.
The method for determining the target exhaust superheat degree delta T comprises the following steps:
when the refrigerant is R134 a: Δ T =20 ℃;
when the refrigerant is R22: Δ T =25 ℃;
when the refrigerant is R410A: Δ T =28 ℃.
The method for calculating the exhaust superheat degree delta Tp of the compressor comprises the following steps:
detecting a compressor discharge temperature T5;
the detection temperature T6;
detecting an ambient temperature T7;
ΔTp= T5-[(a1×T7+a2)×T6+a3×T7+a4]；
wherein a1, a2, a3 and a4 are constant coefficients.
Since the condensing temperature sensor is difficult to arrange on the condenser (because: the temperature sensor is difficult to be fixedly fitted to the tank coil, the condenser is in the tank foamed layer, and the condensing temperature sensor is difficult to be replaced for after-sales repair due to malfunction), the tank-side condensing temperature Tc is obtained empirically as Δ Tp = T5-Tc.
Tc = (0.0011 × T7+0.87) × T6+0.05 × T7+13.4 was measured through a laboratory.
The adjustment frequency of the auxiliary throttling element 17 can be set as desired, for example, the adjustment frequency can be set to 60 s.
The method for adjusting the opening degree of the main throttling element 16 comprises the following steps:
detecting the suction temperature T3 of the compressor;
detecting the evaporation temperature T4;
adjusting the main throttling element to a target opening Xi + 1;
Xi+1=Xi+ΔX；
ΔX=(T3-T4)-Δt；
wherein Xi is the current opening degree of the main throttling element;
Δ t is the target suction superheat.
The method for determining the target degree of superheat delta t of inspiration comprises the following steps:
detecting a compressor discharge temperature T5;
Δ T = T1 when T5 > b 1;
when b1 is more than or equal to T5 > b2, delta T = T2;
when b2 is more than or equal to T5 > b3, delta T = T3;
when b3 is more than or equal to T5 > b4, delta T = T4;
when b4 is more than or equal to T5, delta T = T5;
wherein, the temperature is more than or equal to 100 ℃ and more than b1, b2, b3, b4 and more than 30 ℃, t1 is more than 0 and more than t2 and more than t3 and more than t4 and more than t 5.
In order to prevent the compressor 11 from being damaged by liquid refrigerant caused by liquid impact when entering the compressor from the main pipeline 14 and the auxiliary pipeline 15, a vapor-liquid separator 24 is preferably further disposed at the front end of the air inlet of the compressor 11 for separating the refrigerant in vapor-liquid two-phase state to protect the compressor.
Example two
In this embodiment, a control system of a space energy heat pump water heater is provided, as shown in fig. 1, and includes a compressor 11, a condenser 12, and an evaporator 13, where a main pipe 14 is connected between an outlet of the condenser 11 and an inlet of the evaporator 13, an auxiliary pipe 15 is connected between an outlet of the condenser 11 and an outlet of the evaporator 13, the main pipe 14 is provided with a main throttling element 16, and the auxiliary pipe 15 is provided with an auxiliary throttling element 17.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A control method of a space energy heat pump water heater is characterized in that the space energy heat pump water heater comprises a main pipeline connected between an outlet of a condenser and an inlet of an evaporator and an auxiliary pipeline connected between an outlet of the condenser and an outlet of the evaporator, a main throttling element is arranged in the main pipeline, an auxiliary throttling element is arranged in the auxiliary pipeline, and the control method comprises the following steps:
detecting the opening degree of a main throttling element, and acquiring the suction superheat degree delta Ts and the exhaust superheat degree delta Tp of the compressor when the opening degree of the main throttling element is maximum;
when the suction superheat degree delta Ts is more than or equal to T11 and the exhaust superheat degree delta Tp is more than or equal to T12, opening the auxiliary throttling element, wherein T11 is more than or equal to 4 ℃ and less than or equal to 10 ℃; t12 is more than or equal to 30 ℃ and less than or equal to 38 ℃.
2. A method according to claim 1 wherein the step of activating the secondary throttling element comprises:
when the exhaust superheat degree delta Tp is larger than or equal to T12, adjusting the opening of the auxiliary throttling element by adopting the exhaust superheat degree;
when the exhaust superheat degree delta Tp is less than T12, the auxiliary throttling element keeps the existing opening degree, and the opening degree of the main throttling element is adjusted by adopting the suction superheat degree.
3. A space energy heat pump water heater control method according to claim 2, wherein the opening degree adjusting method of the auxiliary throttling element is as follows:
calculating a target opening P of the secondary restriction elementi+1；
Wherein, Pi+1= Pi+ΔP；
ΔP=ΔTp-ΔT；
PiIs the current opening degree of the auxiliary throttling element;
Δ T is the target exhaust superheat.
4. A space energy heat pump water heater control method according to claim 3 wherein the target exhaust superheat Δ T is determined by:
when the refrigerant is R134 a: Δ T =20 ℃;
when the refrigerant is R22: Δ T =25 ℃;
when the refrigerant is R410A: Δ T =28 ℃.
5. A space energy heat pump water heater control method according to any one of claims 1-3 wherein the compressor discharge superheat degree Δ Tp is calculated by:
detecting a compressor discharge temperature T5;
the detection temperature T6;
detecting an ambient temperature T7;
ΔTp= T5-[(a1×T7+a2)×T6+a3×T7+a4]；
wherein a1, a2, a3 and a4 are constant coefficients.
6. A space energy heat pump water heater control method according to claim 5, characterized in that the method for adjusting the opening degree of the main throttling element is as follows:
detecting the suction temperature T3 of the compressor;
detecting the evaporation temperature T4;
adjusting the main throttling element to a target opening Xi + 1;
Xi+1=Xi+ΔX；
ΔX=(T3-T4)-Δt；
wherein Xi is the current opening degree of the main throttling element;
Δ t is the target suction superheat.
7. A space energy heat pump water heater control method according to claim 6,
the method for determining the target degree of superheat delta t of inspiration comprises the following steps:
detecting a compressor discharge temperature T5;
Δ T = T1 when T5 > b 1;
when b1 is more than or equal to T5 > b2, delta T = T2;
when b2 is more than or equal to T5 > b3, delta T = T3;
when b3 is more than or equal to T5 > b4, delta T = T4;
when b4 is more than or equal to T5, delta T = T5;
wherein, the temperature is more than or equal to 100 ℃ and more than b1, b2, b3, b4 and more than 30 ℃, t1 is more than 0 and more than t2 and more than t3 and more than t4 and more than t 5.
8. A space energy heat pump water heater control system comprising an evaporator, a compressor, a condenser and a water tank, wherein the control system performs control according to the control method of any one of claims 1 to 7.
9. A space energy heat pump water heater control system according to claim 8 wherein said primary throttling element and secondary throttling element are electronic expansion valves with adjustable openings, respectively.
10. A space energy heat pump water heater control system according to claim 8 and further comprising:
an evaporation temperature sensor for detecting an evaporator temperature;
a suction temperature sensor for detecting a compressor suction temperature;
an exhaust temperature sensor for detecting a compressor exhaust temperature;
a tank temperature sensor for detecting a temperature of water in the tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113530794A (en) * | 2021-08-13 | 2021-10-22 | 合肥天鹅制冷科技有限公司 | High-temperature area compressor overheating control system and control method |
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Application publication date: 20210511 |