CN107763887B - Energy level control method and control device for dual-system heat pump unit - Google Patents
Energy level control method and control device for dual-system heat pump unit Download PDFInfo
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- CN107763887B CN107763887B CN201711075532.1A CN201711075532A CN107763887B CN 107763887 B CN107763887 B CN 107763887B CN 201711075532 A CN201711075532 A CN 201711075532A CN 107763887 B CN107763887 B CN 107763887B
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Abstract
The invention provides an energy level control method and a control device of a dual-system heat pump unit, wherein the method comprises the following steps: detecting the water inlet temperature value in real time when the heating mode operates; starting compressors of two heat pump systems of the dual-system heat pump unit when the inlet water temperature value meets a preset heating working condition; after the two compressors are started, when the inlet water temperature value is judged to be larger than a preset heating target temperature value, one compressor of the dual-system heat pump unit is closed; after one compressor is closed, when the inlet water temperature value is judged to be smaller than the preset heating target temperature value, restarting the closed compressor of the heat pump system; and after restarting the closed compressor, when judging that the inlet water temperature value is equal to a preset highest temperature value, closing the compressors of the two heat pump systems of the dual-system heat pump unit. The embodiment of the invention can effectively avoid frequent starting of the compressor, thereby reducing the energy consumption of the dual-system heat pump unit.
Description
Technical Field
The invention relates to the technical field of heat pump equipment, in particular to a method and a device for controlling the energy level of a dual-system heat pump unit.
Background
In the prior art, after a dual-system heat pump unit is started by setting a target temperature, one heat pump system is closed when the return water temperature is lower than a negative return difference of the target temperature, and the water temperature at the moment does not reach a set value of the target temperature, so that the other heat pump system is required to supply heat.
At present, when a dual-system heat pump unit operates in a northern low-temperature environment, because heat dissipation capacity is large, only one heat pump system supplies heat and cannot meet heat supply requirements, water temperature cannot rise, the water temperature drops after a period of time, one closed heat pump system is started again, when the return water temperature is smaller than a negative return difference of a target temperature, one heat pump system is continuously closed, a compressor of the other heat pump system is frequently started, energy consumption is high, and the heat pump unit cannot reach the target temperature all the time.
Disclosure of Invention
The embodiment of the invention provides an energy level control method and a control device of a dual-system heat pump unit, which are used for solving the technical problem that a compressor of one heat pump system is frequently started and cannot reach a target temperature when the existing dual-system heat pump unit operates in a low-temperature environment, so that the compressor is prevented from being frequently started, energy consumption is further saved, and the target temperature is effectively reached.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling an energy level of a dual-system heat pump unit, including:
detecting the water inlet temperature value in real time when the heating mode operates;
starting compressors of two heat pump systems of the dual-system heat pump unit when the inlet water temperature value meets a preset heating working condition;
after the compressors of the two heat pump systems are started, when the inlet water temperature value is judged to be larger than a preset heating target temperature value, the compressor of one heat pump system of the dual-system heat pump unit is closed;
after a compressor of one heat pump system is closed, restarting the closed compressor of the heat pump system when the inlet water temperature value is judged to be smaller than the preset heating target temperature value;
after restarting the closed compressors of the heat pump systems, when judging that the inlet water temperature value is equal to a preset highest temperature value, closing the compressors of the two heat pump systems of the dual-system heat pump unit; the preset maximum temperature value is equal to the sum of the preset heating target temperature value and a first heating shutdown temperature return difference value, and the preset heating target temperature value is smaller than the preset maximum temperature value.
As a preferred scheme, after the two compressors of the heat pump system are started, when it is determined that the inlet water temperature value is greater than a preset heating target temperature value, the method for turning off the compressor of one heat pump system of the dual-system heat pump unit specifically includes:
after the compressors of the two heat pump systems are started, when the inlet water temperature value is judged to be larger than the preset heating target temperature value, judging whether the inlet water temperature value is equal to a preset first heating temperature value or not; the preset first heating temperature value is equal to the sum of the preset heating target temperature value and a second heating shutdown temperature return difference value;
and when the inlet water temperature value is judged to be equal to the preset first heating temperature value, closing a compressor of one heat pump system of the dual-system heat pump unit.
As a preferable scheme, after the compressor of one heat pump system is turned off, when it is determined that the intake water temperature value is smaller than the preset heating target temperature value, restarting the turned-off compressor of the heat pump system specifically includes:
after a compressor of the heat pump system is closed, when the inlet water temperature value is judged to be smaller than the preset heating target temperature value, judging whether the inlet water temperature value is equal to a preset second heating temperature value or not; the preset second heating temperature value is equal to the difference between the preset heating target temperature value and the first heating starting temperature return difference value;
and restarting the closed compressor of the heat pump system when the inlet water temperature value is judged to be equal to a preset second heating temperature value.
As a preferred scheme, when the inlet water temperature value meets a preset working condition, starting the compressors of the two heat pump systems of the dual-system heat pump unit specifically comprises:
when the inlet water temperature value is judged to be smaller than a preset second heating temperature value and larger than a preset third heating temperature value, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second heating temperature value is equal to the difference between the preset heating target temperature value and the first heating starting temperature return difference value, and the preset third heating temperature value is equal to the difference between the preset heating target temperature value and the second heating starting temperature return difference value;
and after starting the compressor of one heat pump system, when the inlet water temperature value is judged to be smaller than the preset third heating temperature value, starting the compressor of the other heat pump system of the dual-system heat pump unit.
Preferably, the energy level control method of the dual-system heat pump unit further includes:
detecting the water inlet temperature value in real time when the refrigeration mode operates;
when the inlet water temperature value meets the preset refrigeration working condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit;
after at least one compressor of the heat pump system is started, when the water inlet temperature value is judged to be equal to the preset first refrigeration temperature value, the started compressor of the heat pump system is closed; and the preset first refrigeration temperature value is equal to the difference between the preset refrigeration target temperature value and the first refrigeration shutdown temperature return difference value.
As a preferred scheme, when the inlet water temperature value meets a preset refrigeration working condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit specifically comprises:
when the inlet water temperature value is judged to be larger than a preset second refrigeration temperature value and smaller than a preset third refrigeration temperature value, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the first refrigeration starting temperature return difference value, and the preset third refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the second refrigeration starting temperature return difference value.
As a preferred scheme, after the compressor of one heat pump system of the dual-system heat pump unit is started when the inlet water temperature value is judged to be greater than the preset second refrigeration temperature value and less than the preset third refrigeration temperature value, the method further includes:
after one compressor of the heat pump system is started, when the inlet water temperature value is judged to be greater than the preset third refrigeration temperature value, two compressors of the heat pump system of the dual-system heat pump unit are started.
As a preferred scheme, when the inlet water temperature value meets a preset refrigeration working condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit specifically comprises:
when the inlet water temperature value is judged to be larger than or equal to a preset third refrigeration temperature value, starting compressors of two heat pump systems of the dual-system heat pump unit; and the preset third refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the second refrigeration starting temperature return difference value.
As a preferable scheme, after the compressor of at least one heat pump system of the dual-system heat pump unit is started when the inlet water temperature value meets a preset refrigeration working condition, the method further includes:
when judging that the number of the started compressors of the dual-system heat pump unit is 2, judging whether the water inlet temperature value is equal to a preset fourth refrigeration temperature value or not; the preset fourth refrigeration temperature value is equal to the difference between the preset refrigeration target temperature value and the third refrigeration starting temperature return difference value;
when the inlet water temperature value is judged to be equal to a preset fourth refrigeration temperature value, a compressor of one heat pump system of the dual-system heat pump unit is closed;
after a compressor of one heat pump system of the dual-system heat pump unit is closed, when the inlet water temperature value is judged to be larger than the preset second refrigeration temperature value, the closed compressor of the heat pump system is started; and the preset second refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the first refrigeration starting temperature return difference value.
In order to solve the same technical problem, an embodiment of the present invention further provides an energy level control apparatus for a dual-system heat pump unit, including:
the real-time detection module is used for detecting the water inlet temperature value in real time when the heating mode operates;
a first start-up compressor module; the compressors of the two heat pump systems of the dual-system heat pump unit are started when the inlet water temperature value meets the preset heating working condition;
a first shutdown compressor module; the system comprises a compressor, a water inlet temperature sensor, a water outlet temperature sensor, a water inlet temperature sensor and a water outlet temperature sensor;
a second start-up compressor module; the system comprises a compressor, a water inlet temperature sensor, a water outlet temperature sensor, a water inlet temperature sensor and a water outlet temperature sensor, wherein the water inlet temperature sensor is used for detecting the temperature of water in the;
a second shutdown compressor module; the system comprises a compressor, a water inlet temperature sensor, a temperature sensor and a controller, wherein the compressor is used for switching on the two heat pump systems of the double-system heat pump unit when the compressor of the closed heat pump system is restarted and the inlet water; the preset maximum temperature value is equal to the sum of the preset heating target temperature value and a first heating shutdown temperature return difference value, and the preset heating target temperature value is smaller than the preset maximum temperature value.
Compared with the prior art, the embodiment of the invention has the beneficial effects that the problems that the compressor of one heat pump system is closed when the water temperature is lower than the negative return difference of the target temperature in the heating mode of the traditional double-system heat pump unit are avoided, the compressor is not suitable for the low-temperature environment, the compressor is started frequently, and the target temperature cannot be reached are solved. When the double-system heat pump unit operates in a low-temperature environment, the compressor of one heat pump system of the double-system heat pump unit is closed only when the inlet water temperature value is greater than the preset heating target temperature value, and at the moment, the inlet water temperature meets the heat supply requirement, so that frequent starting of the compressor is effectively avoided, and the energy consumption of the double-system heat pump unit is further reduced.
Drawings
FIG. 1 is a flow chart of a method for controlling energy levels of a dual-system heat pump unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dual-system heat pump unit according to a first embodiment of the present invention in a heating mode;
FIG. 3 is a flowchart illustrating the step of step S3 according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating the step of step S4 according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating the step of step S2 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the operation of the dual system heat pump unit in the cooling mode according to the embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an energy level control apparatus of a dual-system heat pump unit according to a first embodiment of the present invention;
wherein T is a water inlet temperature value; t0 is a preset heating target temperature value; t1 is the first heating start-up temperature return difference value; t2 is the second heating start-up temperature return difference value; t3 is the second heating shutdown temperature setback value; t4 is the first heating shutdown temperature setback value; d1 is a preset second heating temperature value; d1 ═ T0-T1; d2 is a preset third heating temperature value; d2 ═ T0-T2; d3 is a preset first heating temperature value; d3 ═ T0+ T3; d4 is a preset maximum temperature value; d4 ═ T0+ T4;
r0 is a preset target temperature value for cooling; r1 is the first refrigeration turn-on temperature setback value; r2 is the second refrigeration startup temperature setback value; r3 is the third refrigeration startup temperature setback value; r4 is the first refrigeration shutdown temperature setback value; e1 is a preset second refrigeration temperature value; e1 ═ R0+ R1; e2 is a preset third refrigeration temperature value; e2 ═ R0+ R3; e3 is a preset fourth refrigeration temperature value; e3 ═ R0-R3; e4 is a preset first refrigeration temperature value; e4 ═ R0-R4;
11. an energy level control device of the dual-system heat pump unit; 11. a real-time detection module; 12. a first start-up compressor module; 13. a first shutdown compressor module; 14. a second start-up compressor module; 15. the second shutdown compressor module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
See fig. 1 and 2; the preferred embodiment of the invention provides an energy level control method of a dual-system heat pump unit, which comprises the following steps:
s1, detecting the water inlet temperature value T in real time when the heating mode operates;
s2, starting compressors of two heat pump systems of the dual-system heat pump unit when the inlet water temperature value T meets a preset heating working condition;
s3, after the compressors of the two heat pump systems are started, when the inlet water temperature T is judged to be larger than a preset heating target temperature T0, the compressor of one heat pump system of the double-system heat pump unit is closed;
s4, after a compressor of the heat pump system is closed, when the inlet water temperature T is judged to be smaller than the preset heating target temperature T0, the closed compressor of the heat pump system is restarted;
s5, after restarting the closed compressors of the heat pump systems, when judging that the water inlet temperature T is equal to a preset highest temperature D4, closing the compressors of the two heat pump systems of the dual-system heat pump unit; the preset maximum temperature value D4 is equal to the sum of the preset heating target temperature value T0 and a first heating shutdown temperature return difference value T4, and the preset heating target temperature value T0 is smaller than the preset maximum temperature value D4.
Compared with the prior art, the energy level control method of the dual-system heat pump unit provided by the embodiment of the invention avoids the problem that the compressor of one heat pump system is not suitable for a low-temperature environment when the water temperature is lower than the negative return difference of the target temperature in the heating mode of the conventional dual-system heat pump unit, so that the compressor is frequently started and cannot reach the target temperature. When the double-system heat pump unit operates in a low-temperature environment, the compressor of one heat pump system of the double-system heat pump unit is closed only when the inlet water temperature value is greater than a preset heating target temperature value T0, and at the moment, the inlet water temperature meets the heat supply requirement, so that frequent starting of the compressor is effectively avoided, and the energy consumption of the double-system heat pump unit is further reduced.
In the embodiment of the present invention, it should be noted that the preset heating target temperature value T0 is a heating start-up temperature set value when the heating mode is in operation; the first heating startup temperature return difference value T1 is a heating startup return difference value 1; the second heating startup temperature return difference value T2 is a heating startup return difference value 2; the second heating-shutdown temperature return difference value T3 is a heating-shutdown temperature return difference value 1; the first heating shutdown temperature return difference value T4 is a heating shutdown return difference value 2.
Referring to fig. 1 to fig. 3, as a further preferred embodiment, after the starting of the compressors of the two heat pump systems, when it is determined that the intake water temperature T is greater than a preset heating target temperature T0, the step S3 of turning off the compressor of one heat pump system of the dual-system heat pump unit specifically includes:
s31, after the compressors of the two heat pump systems are started, when the water inlet temperature value T is judged to be larger than the preset heating target temperature value T0, judging whether the water inlet temperature value T is equal to a preset first heating temperature value D3 or not; wherein the preset first heating temperature value D3 is equal to the sum of the preset heating target temperature value T0 and a second heating-shutdown temperature return difference value T3;
s32, when the inlet water temperature value T is judged to be equal to the preset first heating temperature value D3, a compressor of one heat pump system of the dual-system heat pump unit is closed, and the dual-system heat pump unit operates according to ① - ② - ③ - ④ - ⑤ - ⑥ - ⑦ - ⑧ shown in figure 2.
In the embodiment of the present invention, it should be noted that, when the intake water temperature value T is equal to the preset first heating temperature value D3 and the intake water temperature T is higher than the preset heating target temperature value T0, it indicates that the water temperature has reached the target requirement of the user.
When only one compressor of the heat pump system is started to heat water, if the heat supply amount is larger than the heat dissipation amount in a subsequent period of time, the water temperature cannot be reduced, and the subsequent heat supply requirement can be met by only starting one compressor of the heat pump system, so that the energy consumption is saved.
Referring to fig. 1, 2 and 4, as a further preferred embodiment, after shutting down a compressor of the heat pump system, when it is determined that the intake water temperature T is lower than the preset heating target temperature T0, the step S4 of restarting the shut-down compressor of the heat pump system specifically includes:
s41, after a compressor of the heat pump system is closed, when the intake water temperature T is judged to be smaller than the preset heating target temperature T0, judging whether the intake water temperature T is equal to a preset second heating temperature D1; wherein, the preset second heating temperature value D1 is equal to the difference between the preset heating target temperature value T0 and the first heating startup temperature return difference value T1;
and S42, restarting the compressor of the heat pump system which is shut down when the inlet water temperature value T is judged to be equal to a preset second heating temperature value D1.
When the inlet water temperature value T is judged to be equal to the preset highest temperature value D4, the compressors of the two heat pump systems of the dual-system heat pump unit are closed, and the dual-system heat pump unit is according to the formula ① - ② - ③ - ④ - ⑤ - ⑨ - ⑩ as shown in FIG. 2
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And (5) operating.
In the embodiment of the present invention, it should be noted that, when only one compressor of the heat pump system is started to heat water, if the ambient temperature is low at this time, so that the heat dissipation amount is greater than the heat supply amount, the compressor of only one heat pump system is started to fail to meet the heat supply requirement, and after a period of time, the water inlet temperature drops to a preset second heating temperature value D1, that is, T < T0-T1, the compressor of the heat pump system that is turned off is restarted. When the temperature of the inlet water T reaches the preset first heating temperature value D3 again, because before the preset first heating temperature value D3 closes one heat pump system compressor and cannot meet the heat supply requirement of a user, at the moment, the double-system unit does not stop and continues heating until the preset highest temperature value D4, the whole machine stops, and energy consumption is saved
Referring to fig. 1, fig. 2 and fig. 5, as a further preferred embodiment, when the intake water temperature T satisfies a preset operating condition, the step S2 of starting the compressors of the two heat pump systems of the dual-system heat pump unit specifically includes:
s21, when the inlet water temperature T is judged to be smaller than a preset second heating temperature D1 and larger than a preset third heating temperature D2, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second heating temperature value D1 is equal to the difference between the preset heating target temperature value T0 and the first heating start-up temperature return difference value T1, and the preset third heating temperature value D2 is equal to the difference between the preset heating target temperature value T0 and the second heating start-up temperature return difference value T2;
s22, after starting the compressor of one heat pump system, when the inlet water temperature T is judged to be smaller than the preset third heating temperature D2, starting the compressor of the other heat pump system of the dual-system heat pump unit.
In the embodiment of the invention, the dual-system heat pump unit is started for the first time, when the water inlet temperature value T is smaller than a preset second heating temperature value D1 and is larger than a preset third heating temperature value D2, that is, T0-T2< T0-T1, a compressor of one heat pump system of the dual-system heat pump unit is started, and the water inlet temperature T0 is continuously detected and judged at the moment; and when the water inlet temperature value T is judged to be smaller than the preset third heating temperature value D2, namely T is less than T0-T2, starting a compressor of the other heat pump system of the dual-system heat pump unit, and if the water inlet temperature T0 is still reduced, starting electric heating to assist in heating hot water.
Referring to fig. 6, as a further preferred embodiment, the energy level control method of the dual-system heat pump unit further includes:
detecting a water inlet temperature value T in real time when the refrigerator operates in a refrigeration mode;
when the inlet water temperature value T meets a preset refrigeration working condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit;
after at least one compressor of the heat pump system is started, when the water inlet temperature value T is judged to be equal to the preset first refrigeration temperature value E4, the started compressor of the heat pump system is closed; wherein the preset first cooling temperature value E4 is equal to the difference between the preset target cooling temperature value R0 and the first cooling shutdown temperature return difference value R4.
In the embodiment of the present invention, it should be noted that the preset cooling target temperature value R0 is a heating starting temperature set value when the cooling mode is in operation; the first refrigeration starting temperature difference value R1 is a refrigeration starting temperature difference value 1; the second refrigeration starting-up temperature return difference value is a refrigeration starting-up temperature return difference value 2; the third refrigeration starting temperature difference value R3 is a refrigeration stopping temperature difference value 1; the first refrigeration shutdown temperature return difference value is a refrigeration shutdown temperature return difference value 2.
Referring to fig. 6, as a further preferred embodiment, when the intake water temperature T meets a preset refrigeration operating condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit specifically includes:
when the inlet water temperature value T is judged to be larger than a preset second refrigeration temperature value E1 and smaller than a preset third refrigeration temperature value E2, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second refrigeration temperature value E1 is equal to the sum of the preset refrigeration target temperature value R0 and the first refrigeration startup temperature return difference value R1, and the preset third refrigeration temperature value E2 is equal to the sum of the preset refrigeration target temperature value R0 and the second refrigeration startup temperature return difference value R2.
In the embodiment of the present invention, the dual-system heat pump unit is started for the first time, when the intake water temperature value T is greater than the preset second refrigeration temperature value E1 and less than the preset third refrigeration temperature value E2, that is, R0+ R1< T < R0+ R2, a compressor of one heat pump system of the dual-system heat pump unit is started, at this time, the intake water temperature value T is continuously detected and determined, and if the intake water temperature value T continues to decrease, the dual-system heat pump unit operates according to ⑦ - ⑧ - ④ - ⑤ - ⑥ - ⑦ shown in fig. 6.
Referring to fig. 6, as a further preferred embodiment, after the starting of the compressor of one of the heat pump systems of the dual-system heat pump unit when the intake water temperature T is determined to be greater than the preset second cooling temperature E1 and less than the preset third cooling temperature E2, the method further includes:
after starting one compressor of the heat pump system, when the inlet water temperature value T is judged to be greater than the preset third refrigeration temperature value E2, starting the two compressors of the heat pump systems of the dual-system heat pump unit.
In the embodiment of the invention, the dual-system heat pump unit is started for the first time, when the intake water temperature value T is greater than a preset second refrigeration temperature value E1 and less than a preset third refrigeration temperature value E2, that is, R0+ R1< T < R0+ R2, a compressor of one heat pump system of the dual-system heat pump unit is started, the intake water temperature value T is continuously detected and judged at this time, and if the intake water temperature value T continues to rise, the dual-system heat pump unit operates according to ⑦ - ⑨ - ① - ② - ③ - ④ - ⑤ - ⑥ shown in fig. 6.
As a preferred embodiment, when the intake water temperature T meets a preset refrigeration condition, starting a compressor of at least one heat pump system of the dual-system heat pump unit specifically includes:
when the water inlet temperature value T is judged to be larger than or equal to a preset third refrigeration temperature value E2, starting compressors of two heat pump systems of the dual-system heat pump unit; wherein the preset third refrigeration temperature value E2 is equal to the sum of the preset refrigeration target temperature value R0 and the second refrigeration startup temperature difference value R2.
In the embodiment of the invention, the dual-system heat pump unit is started for the first time, and when the water inlet temperature value T is greater than or equal to a preset third refrigeration temperature value E2, namely T is greater than or equal to R0+ R2, the dual-system heat pump unit operates according to ① - ② - ③ - ④ - ⑤ - ⑥ shown in FIG. 6.
Further as a preferred embodiment, it should be noted that after the dual-system heat pump unit is stopped at a constant temperature, the dual-system heat pump unit is started again at a constant temperature, and when the intake water temperature value T is greater than a preset second refrigeration temperature value E1, that is, R0+ R1< T, a compressor of one heat pump system of the dual-system heat pump unit is started, and at this time, the intake water temperature value T is continuously detected and judged;
if the inlet water temperature value T continues to drop, the dual-system heat pump unit operates according to ⑦ - ⑧ - ④ - ⑤ - ⑥ - ⑦ shown in figure 6;
if the inlet water temperature value T continues to rise, the dual-system heat pump unit operates according to ⑦ - ⑨ - ① - ② - ③ - ④ - ⑤ - ⑥ shown in FIG. 6.
As a further preferred embodiment, after the compressors of at least one of the heat pump systems of the dual-system heat pump unit are started when the intake water temperature T meets a preset refrigeration working condition, the method further includes:
when judging that the number of the started compressors of the dual-system heat pump unit is 2, judging whether the water inlet temperature value T is equal to a preset fourth refrigeration temperature value E3; wherein the preset fourth cooling temperature value E3 is equal to the difference between the preset target cooling temperature value R0 and the third cooling start-up temperature return difference value R3;
when the water inlet temperature value T is judged to be equal to a preset fourth refrigeration temperature value E3, a compressor of one heat pump system of the dual-system heat pump unit is closed;
after the compressor of one heat pump system of the dual-system heat pump unit is closed, when the water inlet temperature value T is judged to be larger than the preset second refrigeration temperature value E1, the closed compressor of the heat pump system is started; wherein the preset second refrigeration temperature value E1 is equal to the sum of the preset refrigeration target temperature value R0 and the first refrigeration startup temperature return difference value R1.
In the embodiment of the invention, after 2 compressors of the dual-system heat pump unit are started, when the inlet water temperature value T is equal to the preset fourth refrigeration temperature value E3, the compressor of one heat pump system of the dual-system heat pump unit is closed, the water temperature is judged, and if the water temperature continues to rise, the water temperature is determined according to ⑧ - ⑩ shown in FIG. 6
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And (5) operating.
Referring to fig. 7, in order to solve the same technical problem, an embodiment of the present invention further provides an energy level control apparatus 1 for a dual-system heat pump unit, including:
the real-time detection module 11 is used for detecting the water inlet temperature value T in real time when the heating mode operates;
a first start-up compressor module 12; the compressors of the two heat pump systems of the dual-system heat pump unit are started when the inlet water temperature value T meets the preset heating working condition;
a first shutdown compressor module 13; the system comprises a compressor, a water inlet temperature T, a heating target temperature T0, a heat pump system and a heat pump system, wherein the compressor is used for closing one heat pump system of the dual-system heat pump unit when the water inlet temperature T is judged to be larger than the preset heating target temperature T0 after the compressors of the two heat pump systems are started;
a second start-up compressor module 14; the system is used for restarting the closed compressor of the heat pump system when judging that the inlet water temperature value T is smaller than the preset heating target temperature value T0 after the compressor of one heat pump system is closed;
a second shutdown compressor module 15; the system is used for restarting the closed compressors of the heat pump systems, and then closing the compressors of the two heat pump systems of the dual-system heat pump unit when the inlet water temperature value T is judged to be equal to a preset highest temperature value D4; the preset maximum temperature value D4 is equal to the sum of the preset heating target temperature value T0 and the first refrigeration shutdown temperature return difference value T4, and the preset heating target temperature value T0 is smaller than the preset maximum temperature value D4.
In summary, the embodiment of the present invention provides an energy level control method and a control device for a dual-system heat pump unit, so as to avoid the problem that the compressor of one of the heat pump systems is not suitable for a low temperature environment when the water temperature is lower than the negative return difference of the target temperature in the heating mode, and the compressor is frequently started and cannot reach the target temperature. When the double-system heat pump unit operates in a low-temperature environment, the compressor of one heat pump system of the double-system heat pump unit is closed only when the inlet water temperature value is greater than a preset heating target temperature value T0, and at the moment, the inlet water temperature meets the heat supply requirement, so that frequent starting of the compressor is effectively avoided, and the energy consumption of the double-system heat pump unit is further reduced.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An energy level control method of a dual-system heat pump unit is characterized by comprising the following steps:
detecting the water inlet temperature value in real time when the heating mode operates;
starting compressors of two heat pump systems of the dual-system heat pump unit when the inlet water temperature value meets a preset heating working condition;
after the compressors of the two heat pump systems are started, when the inlet water temperature value is judged to be larger than a preset heating target temperature value, the compressor of one heat pump system of the dual-system heat pump unit is closed;
after a compressor of one heat pump system is closed, restarting the closed compressor of the heat pump system when the inlet water temperature value is judged to be smaller than the preset heating target temperature value;
after restarting the closed compressors of the heat pump systems, when judging that the inlet water temperature value is equal to a preset highest temperature value, closing the compressors of the two heat pump systems of the dual-system heat pump unit; the preset maximum temperature value is equal to the sum of the preset heating target temperature value and a first heating shutdown temperature return difference value, and the preset heating target temperature value is smaller than the preset maximum temperature value;
when the inlet water temperature value meets the preset working condition, the compressors of the two heat pump systems of the dual-system heat pump unit are started, and the method specifically comprises the following steps:
when the inlet water temperature value is judged to be smaller than a preset second heating temperature value and larger than a preset third heating temperature value, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second heating temperature value is equal to the difference between the preset heating target temperature value and the first heating starting temperature return difference value, and the preset third heating temperature value is equal to the difference between the preset heating target temperature value and the second heating starting temperature return difference value;
and after starting the compressor of one heat pump system, when the inlet water temperature value is judged to be smaller than the preset third heating temperature value, starting the compressor of the other heat pump system of the dual-system heat pump unit.
2. The method for controlling energy level of a dual-system heat pump unit according to claim 1, wherein after the two compressors of the heat pump systems are started, when it is determined that the inlet water temperature value is greater than a preset heating target temperature value, the method for turning off the compressor of one of the heat pump systems of the dual-system heat pump unit specifically comprises:
after the compressors of the two heat pump systems are started, when the inlet water temperature value is judged to be larger than the preset heating target temperature value, judging whether the inlet water temperature value is equal to a preset first heating temperature value or not; the preset first heating temperature value is equal to the sum of the preset heating target temperature value and a second heating shutdown temperature return difference value;
and when the inlet water temperature value is judged to be equal to the preset first heating temperature value, closing a compressor of one heat pump system of the dual-system heat pump unit.
3. The energy level control method of a dual-system heat pump unit according to claim 1, wherein after a compressor of one of the heat pump systems is turned off, when it is determined that the intake water temperature value is smaller than the preset heating target temperature value, restarting the turned-off compressor of the heat pump system specifically comprises:
after a compressor of the heat pump system is closed, when the inlet water temperature value is judged to be smaller than the preset heating target temperature value, judging whether the inlet water temperature value is equal to a preset second heating temperature value or not; the preset second heating temperature value is equal to the difference between the preset heating target temperature value and the first heating starting temperature return difference value;
and restarting the closed compressor of the heat pump system when the inlet water temperature value is judged to be equal to a preset second heating temperature value.
4. The method for controlling the energy level of a dual-system heat pump unit according to any one of claims 1 to 3, wherein the method for controlling the energy level of the dual-system heat pump unit further comprises:
detecting the water inlet temperature value in real time when the refrigeration mode operates;
when the inlet water temperature value meets the preset refrigeration working condition, starting at least one compressor of the heat pump system of the dual-system heat pump unit;
after at least one compressor of the heat pump system is started, when the inlet water temperature value is judged to be equal to a preset first refrigeration temperature value, the started compressor of the heat pump system is closed; and the preset first refrigeration temperature value is equal to the difference between the preset refrigeration target temperature value and the first refrigeration shutdown temperature return difference value.
5. The energy level control method of a dual-system heat pump unit according to claim 4, wherein the starting at least one compressor of the heat pump system of the dual-system heat pump unit when the inlet water temperature value meets a preset refrigeration working condition specifically comprises:
when the inlet water temperature value is judged to be larger than a preset second refrigeration temperature value and smaller than a preset third refrigeration temperature value, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the first refrigeration starting temperature return difference value, and the preset third refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the second refrigeration starting temperature return difference value.
6. The method for controlling the energy level of a dual-system heat pump unit according to claim 5, wherein after the compressor of one of the heat pump systems of the dual-system heat pump unit is started when the inlet water temperature is determined to be greater than the second preset refrigeration temperature and less than the third preset refrigeration temperature, the method further comprises:
after one compressor of the heat pump system is started, when the inlet water temperature value is judged to be greater than the preset third refrigeration temperature value, two compressors of the heat pump system of the dual-system heat pump unit are started.
7. The energy level control method of a dual-system heat pump unit according to claim 4, wherein the starting at least one compressor of the heat pump system of the dual-system heat pump unit when the inlet water temperature value meets a preset refrigeration working condition specifically comprises:
when the inlet water temperature value is judged to be larger than or equal to a preset third refrigeration temperature value, starting compressors of two heat pump systems of the dual-system heat pump unit; and the preset third refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the second refrigeration starting temperature return difference value.
8. The energy level control method of a dual-system heat pump unit according to claim 4, wherein after at least one compressor of the heat pump system of the dual-system heat pump unit is started when the inlet water temperature value satisfies a preset refrigeration working condition, the method further comprises:
when judging that the number of the started compressors of the dual-system heat pump unit is 2, judging whether the water inlet temperature value is equal to a preset fourth refrigeration temperature value or not; the preset fourth refrigeration temperature value is equal to the difference between the preset refrigeration target temperature value and the third refrigeration starting temperature return difference value;
when the inlet water temperature value is judged to be equal to a preset fourth refrigeration temperature value, a compressor of one heat pump system of the dual-system heat pump unit is closed;
after a compressor of one heat pump system of the dual-system heat pump unit is closed, when the inlet water temperature value is judged to be larger than the preset second refrigeration temperature value, the closed compressor of the heat pump system is started; and the preset second refrigeration temperature value is equal to the sum of the preset refrigeration target temperature value and the first refrigeration starting temperature return difference value.
9. An energy level control device of a dual-system heat pump unit, which is used for executing the energy level control method according to any one of claims 1 to 8, and is characterized by comprising the following steps:
the real-time detection module is used for detecting the water inlet temperature value in real time when the heating mode operates;
a first start-up compressor module; the compressors of the two heat pump systems of the dual-system heat pump unit are started when the inlet water temperature value meets the preset heating working condition;
a first shutdown compressor module; the system comprises a compressor, a water inlet temperature sensor, a water outlet temperature sensor, a water inlet temperature sensor and a water outlet temperature sensor;
a second start-up compressor module; the system comprises a compressor, a water inlet temperature sensor, a water outlet temperature sensor, a water inlet temperature sensor and a water outlet temperature sensor, wherein the water inlet temperature sensor is used for detecting the temperature of water in the;
a second shutdown compressor module; the system comprises a compressor, a water inlet temperature sensor, a temperature sensor and a controller, wherein the compressor is used for switching on the two heat pump systems of the double-system heat pump unit when the compressor of the closed heat pump system is restarted and the inlet water; the preset maximum temperature value is equal to the sum of the preset heating target temperature value and a first heating shutdown temperature return difference value, and the preset heating target temperature value is smaller than the preset maximum temperature value;
the first start-up compressor module is further configured to:
when the inlet water temperature value is judged to be smaller than a preset second heating temperature value and larger than a preset third heating temperature value, starting a compressor of one heat pump system of the dual-system heat pump unit; the preset second heating temperature value is equal to the difference between the preset heating target temperature value and the first heating starting temperature return difference value, and the preset third heating temperature value is equal to the difference between the preset heating target temperature value and the second heating starting temperature return difference value;
and after starting the compressor of one heat pump system, when the inlet water temperature value is judged to be smaller than the preset third heating temperature value, starting the compressor of the other heat pump system of the dual-system heat pump unit.
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| CN111426059A (en) * | 2020-04-29 | 2020-07-17 | 广东芬尼能源技术有限公司 | Control method and device of multi-unit parallel heat pump system |
| CN113237197A (en) * | 2021-05-31 | 2021-08-10 | 青岛海尔空调电子有限公司 | Air conditioning unit and control method thereof |
| CN113864973B (en) * | 2021-09-23 | 2022-08-05 | 珠海格力电器股份有限公司 | Control method, device and system for clustered heat pump unit and air conditioning equipment |
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