CN115789993B - Heat pump unit combining solar energy and air source - Google Patents
Heat pump unit combining solar energy and air source Download PDFInfo
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- CN115789993B CN115789993B CN202211485836.6A CN202211485836A CN115789993B CN 115789993 B CN115789993 B CN 115789993B CN 202211485836 A CN202211485836 A CN 202211485836A CN 115789993 B CN115789993 B CN 115789993B
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- 239000003507 refrigerant Substances 0.000 claims abstract description 137
- 238000010257 thawing Methods 0.000 claims abstract description 127
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002826 coolant Substances 0.000 claims description 70
- 238000001816 cooling Methods 0.000 claims description 40
- 238000000605 extraction Methods 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 abstract description 10
- 230000009471 action Effects 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000002918 waste heat Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 31
- 238000010586 diagram Methods 0.000 description 18
- 230000005855 radiation Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The invention provides a heat pump unit combining solar energy and an air source, which comprises: the heat pump circulation module comprises a compressor, a first heat exchanger and a second heat exchanger, and a cold and hot water main pipe is connected to the first heat exchanger; the three-medium heat exchange modules comprise fans, heat-taking secondary refrigerant pipelines and defrosting secondary refrigerant pipelines; the secondary refrigerant loop comprises a heat-taking secondary refrigerant loop and a defrosting secondary refrigerant loop; the defrosting plate is replaced, one side of the defrosting plate is arranged on the defrosting secondary refrigerant loop, and the other side of the defrosting plate is connected with the cold and hot water main pipe; and the solar heat collectors are arranged at two ends of the defrosting plate exchanger on the defrosting secondary refrigerant loop in parallel. The heat pump unit can be switched in a plurality of modes through the combined action of the modules/components; the number and the cost of on-off valves are reduced; solar energy is used for defrosting in winter, efficient refrigeration in summer and heat recovery of condensation waste heat.
Description
Technical Field
The invention relates to the technical field of heat pump systems, in particular to a heat pump unit combining solar energy and an air source.
Background
The air source heat pump unit is a high-efficiency refrigerating and heating device, but has the problem of frosting when running in winter. At present, the most commonly used air source heat pump is a reverse defrosting method, but the following problems exist: when defrosting, heat is required to be taken from the indoor or hot water pipe, the indoor comfort is poor, the running energy efficiency of the compressor is low, and the service life is prolonged. In addition, in the cooling in summer, the condensation heat is discharged out of the heat pump cycle by a dry cooling mode, and compared with a water-cooled chiller connected with a cooling tower, the cooling energy efficiency ratio is low.
In addition, solar energy is widely used for heating because of the above-mentioned advantages as a safe, clean renewable energy source. However, solar energy is greatly affected by weather and has instability. The traditional solar heating device cannot utilize solar radiation at night, and in overcast and rainy days with weak solar radiation, the temperature of hot water prepared by the solar heating device is lower, so that the requirements of users cannot be met. The existing solar air source heat pump can directly utilize solar radiation to heat when the solar radiation is sufficient, and utilizes the air source heat pump to heat when the solar radiation is insufficient, and the solar air source heat pump and the air source heat pump are switched to run, so that the problem of unstable solar radiation is solved, but weak solar radiation energy is not utilized, and the problem of reverse defrosting of the air source is still not solved.
In order to solve the problem of reverse defrosting of an air source, solar energy and air energy are organically utilized, and the invention patent with the application number of 2015129273. X provides a solar air source heat pump which organically combines solar energy and air energy, not only can realize two traditional system modes of 'solar energy alone direct heating' when solar radiation is stronger and 'air source heat pump alone heating' when no solar radiation is present, but also can realize 'solar air energy combined heat pump heating' when solar radiation is weaker, thereby greatly prolonging the service time of solar energy and remarkably improving the energy efficiency ratio of the system. In addition, the plurality of groups of air-cooling modules are connected to the second heat exchanger through the secondary refrigerant pipeline and are simultaneously connected to the defrosting plate exchanger in parallel. When defrosting, only one air cooling module is defrosted each time, and hot coolant after heat exchange by the defrosting plate is supplied to the air cooling module; the other air cooling modules keep a state of taking heat from the outside, and the cold refrigerant subjected to heat exchange by the second heat exchanger is supplied to the air cooling modules. And each air cooling module alternately defrost, so that the continuous and efficient heating of the unit is ensured.
However, the above system also has the following problems:
1. The system uses common air cooling modules, each air cooling module only has one secondary refrigerant pipeline, the two pairs of secondary refrigerant branch pipes are connected to a defrosting secondary refrigerant loop and a heat-taking secondary refrigerant loop at the same time, and at least 3 (even 4) on-off valves are arranged on the two pairs of secondary refrigerant branch pipes of each air cooling module to separate the defrosting secondary refrigerant loop and the heat-taking secondary refrigerant loop;
2. When defrosting in winter, when two circulating pumps respectively arranged on the defrosting secondary refrigerant loop and the heat taking secondary refrigerant loop of the system run simultaneously, the pressure distribution of the two loops is irregular, if the on-off valve is an electromagnetic valve, the condition of reverse pressure conduction exists, and an electric valve with high price and capable of controlling on-off by both forward and reverse pressures is needed;
3. When the solar energy temperature is low in winter (for example, the prepared hot water is at the temperature of 10-20 ℃), the heat supply requirement of a user cannot be met, but the defrosting requirement can be met. The solar heat collector and the air cooling module of the system are connected in parallel on the same secondary refrigerant loop, the temperature of the secondary refrigerant loop connected with an evaporator is lower during heating operation, and the hotter secondary refrigerant (which is mixed into the low-temperature secondary refrigerant after being prepared) prepared by solar energy cannot be utilized to defrost the frosted air cooling module;
4. in the cooling process in summer, the condensation heat of the system is discharged from the heat pump cycle in a dry cooling mode, and compared with a water-cooled chiller connected with a cooling tower, the system has low refrigeration energy efficiency ratio;
5. In summer refrigeration, the system does not realize the function of condensing waste heat recovery and supplying domestic hot water.
Accordingly, there is a need for improvements in existing heat pump systems.
Disclosure of Invention
The invention provides a heat pump unit combining solar energy and an air source, which can adjust a device to various modes under the combined action of a solar heat collector and a three-medium heat exchange module, is convenient to use, can avoid the mode that a single secondary refrigerant pipeline of an air cooling module of a traditional system is simultaneously connected with two secondary refrigerant loops, can reduce the number of on-off valves, the two secondary refrigerant loops are not communicated, an electric valve with a relatively high price in the system can be replaced by an inexpensive electromagnetic valve, the cost is saved, and the control and management of a standardized module are simpler. The defrosting secondary refrigerant loop and the heat taking secondary refrigerant loop are two independent loops, can operate at different temperatures, and when heating is performed in winter, the solar heat collector is connected to the defrosting secondary refrigerant loop with relatively high temperature, so that frosted air cooling modules can be directly defrosted.
The invention provides a heat pump unit combining solar energy and an air source, which comprises:
The heat pump circulation module comprises a compressor, a first heat exchanger, a throttling device and a second heat exchanger which are sequentially connected, wherein a cold and hot water main pipe is connected to the first heat exchanger;
the three-medium heat exchange modules comprise fans, a heat-taking secondary refrigerant pipeline and a defrosting secondary refrigerant pipeline, wherein the fans are used for driving air to exchange heat with the heat-taking secondary refrigerant pipeline and the defrosting secondary refrigerant pipeline;
a coolant loop comprising a hot coolant loop and a defrost coolant loop;
A defrosting plate exchanger, one side of which is arranged on the defrosting secondary refrigerant loop and the other side of which is connected with the cold and hot water main pipe;
At least one solar heat collector which is arranged at two ends of the defrosting plate exchanger on the defrosting secondary refrigerant ring in parallel;
all the heat-taking secondary refrigerant pipelines are arranged at two ends of the second heat exchanger on the heat-taking secondary refrigerant loop in parallel, and all the defrosting secondary refrigerant pipelines are arranged at two ends of the defrosting plate exchanger on the defrosting secondary refrigerant loop in parallel.
According to the heat pump unit combining solar energy with an air source, a heat-taking side secondary refrigerant pump is arranged between the second heat exchanger and the three-medium heat exchange module closest to the second heat exchanger on the heat-taking secondary refrigerant loop; and a defrosting side secondary refrigerant pump is arranged between the defrosting plate exchanger and the three-medium heat exchange module closest to the defrosting plate exchanger on the defrosting secondary refrigerant loop.
According to the heat pump unit combining solar energy with an air source, the defrosting refrigerant loop is provided with the solar refrigerant pump, and the solar refrigerant pump is used for driving the refrigerant to circulate between the defrosting refrigerant loop and the solar refrigerant pump.
According to the heat pump unit combining solar energy with an air source, each heat-taking secondary refrigerant pipeline connected with the heat-taking secondary refrigerant loop is provided with a first heat-taking valve; and each defrosting secondary refrigerant pipeline connected with the defrosting secondary refrigerant loop is provided with a first defrosting valve.
According to the heat pump unit combining solar energy with an air source, the defrosting secondary refrigerant loop is provided with the second defrosting valve for controlling the on-off of the solar heat collector.
According to the heat pump unit combining solar energy and air source, the pipeline for exchanging and connecting the cold and hot water main pipe and the defrosting plate is provided with the third defrosting valve.
According to the heat pump unit combining solar energy and an air source, the defrosting plate exchanger and the first heat exchanger are respectively and independently connected to the cold and hot water main pipe; or the defrosting plate is connected with the first heat exchanger in parallel through a hot water pipeline and then connected to the cold and hot water main pipe; or the defrosting plate is connected with the first heat exchanger in series through a hot water pipeline and then connected to the cold and hot water main pipe.
According to the heat pump unit combining solar energy and an air source, the heat pump unit further comprises at least one cooling device, and the cooling devices are arranged at two ends of the second heat exchanger on the heat-taking refrigerating medium loop in parallel.
According to the heat pump unit combining solar energy with an air source, the heat-taking refrigerating medium loop is provided with the second heat-taking valve for controlling the on-off of the cooling device.
According to the heat pump unit combining solar energy with an air source, the four-way valve for changing the flow direction of the refrigerant is arranged on the heat pump circulation module.
The heat pump unit combining solar energy and an air source provided by the invention can adjust the device to various modes (see the embodiment specifically) under the combined action of the solar water collector and the three-medium heat exchange module, so that the heat pump unit is convenient to use; the common air cooling module of the system in the background art is replaced by a three-medium heat exchange module, two secondary refrigerant pipelines are arranged in each three-medium heat exchange module, heat exchange is carried out between the secondary refrigerant pipelines and air circulating outside the secondary refrigerant pipelines through driving of a fan, and the secondary refrigerant pipelines are connected to a defrosting secondary refrigerant loop and a heat-taking secondary refrigerant loop through secondary refrigerant branch pipes respectively. The form that a single secondary refrigerant pipeline of the air cooling module of the traditional system is simultaneously connected with two secondary refrigerant loops is avoided, so that the number of on-off valves is reduced; and the two secondary refrigerant loops are not communicated, the electric valve with high price can be replaced by an inexpensive electromagnetic valve, the cost is saved, and the control and management of the standardized module are simpler. The defrosting secondary refrigerant loop and the heat taking secondary refrigerant loop are two independent loops, can operate at different temperatures, and when heating is performed in winter, the solar heat collector is connected to the defrosting secondary refrigerant loop with relatively high temperature, so that frosted air cooling modules can be directly defrosted.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the heat pump unit of embodiment 1 of the present invention combining solar energy with an air source;
FIG. 2 is a schematic diagram of the operation mode of embodiment 1 according to the present invention;
FIG. 3 is a schematic diagram of the second mode of operation of embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of the third mode of operation of embodiment 1 according to the present invention;
FIG. 5 is a schematic diagram of the operation mode IV of embodiment 1 of the present invention;
FIG. 6 is a schematic diagram of the fifth mode of operation of embodiment 1 of the present invention;
FIG. 7 is a schematic view of the heat pump unit of embodiment 2 combining solar energy and air source according to the present invention;
FIG. 8 is a schematic view of the operation mode of embodiment 2 of the present invention;
FIG. 9 is a schematic view of the heat pump unit of embodiment 3 of the present invention combining solar energy with air source;
FIG. 10 is a schematic view of the operation mode of embodiment 3 of the present invention;
FIG. 11 is a schematic diagram of the second mode of operation of embodiment 3 of the present invention;
Fig. 12 is a schematic structural diagram of a heat pump unit embodiment 4 combining solar energy and an air source according to the present invention.
Reference numerals:
1-a compressor; 2-a first heat exchanger; 3-a second heat exchanger; 4-a cold and hot water dry pipe; 5-a fan; 6-taking a hot secondary refrigerant pipeline; 7-defrosting the secondary refrigerant pipeline; 8-a hot coolant loop; 9-defrost-coolant loop; 10-defrosting plate replacement; 11-a solar collector; 12-a hot side coolant pump; 13-defrost side coolant pump; 14-a solar coolant pump; 15-a first heat extraction valve; 16-a first defrost valve; 17-a second defrost valve; 18-a third defrost valve; 19-a cooling device; 20-a second heat extraction valve; 21-a throttle device; 22-four-way valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The solar-air source combined heat pump assembly of the present invention is described below with reference to fig. 1-12. The flow of liquid medium indicated by the arrows in the figures is illustrated for a few examples only and is not a limitation of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a heat pump unit combining solar energy and an air source according to the present embodiment. The heat pump set that solar energy and air source of this embodiment combined includes:
the heat pump circulation module comprises a compressor 1, a first heat exchanger 2, a throttling device 21 and a second heat exchanger 3 which are sequentially connected, and a cold and hot water main pipe 4 is connected to the first heat exchanger 2;
the three-medium heat exchange modules comprise fans 5, heat-taking secondary refrigerant pipelines 6 and defrosting secondary refrigerant pipelines 7, wherein the fans 5 are used for driving air to exchange heat with the heat-taking secondary refrigerant pipelines 6 and the defrosting secondary refrigerant pipelines 7, and in specific implementation, the number of the three-medium heat exchange modules can be set according to requirements;
A coolant loop comprising a hot coolant loop 8 and a defrost coolant loop 9;
The defrosting plate exchanger 10, one side of the defrosting plate exchanger 10 is arranged on the defrosting secondary refrigerant loop 9, and the other side is connected with the cold and hot water main pipe 4;
At least one solar collector 11, the solar collectors 11 are arranged in parallel at both ends of the defrosting plate exchanger 10 on the defrosting coolant loop 9. In the specific implementation, the number of the three-medium heat exchange modules can be set according to the requirement, and the solar heat collector 11 is arranged, so that heat can be supplemented to provide heat for a large water source heat pump during heating in winter, and the system can also be used for defrosting;
All the heat-taking coolant pipelines 6 are arranged at two ends of the second heat exchanger 3 on the heat-taking coolant loop 8 in parallel, and all the defrosting coolant pipelines 7 are arranged at two ends of the defrosting plate exchanger 10 on the defrosting coolant loop 9 in parallel.
In this embodiment, as shown in fig. 1, a heat-collecting side coolant pump 12 is disposed on the heat-collecting coolant loop 8 between the second heat exchanger 3 and the three-medium heat exchange module nearest to the second heat exchanger 3; a defrost-side coolant pump 13 is provided on the defrost-side coolant loop 9 between the defrost plate 10 and the three-medium heat exchange module nearest the defrost plate 10. By providing the heat-extracting-side coolant pump 12 and the defrost-side coolant pump 13 on the heat-extracting-coolant loop 8 and the defrost-coolant loop 9, respectively, the coolant in the heat-extracting-coolant loop 8 and the defrost-coolant loop 9 can be driven and caused to flow in the corresponding pipes, respectively.
As shown in fig. 1, in this embodiment, the defrosting coolant loop 9 is provided with a solar coolant pump 14, and the solar coolant pump 14 is used to drive the coolant to circulate between the defrosting coolant loop 9 and the solar coolant pump 14.
In this embodiment, as shown in fig. 1, each of the hot coolant lines 6 connected to the hot coolant loop 8 is provided with a first heat extraction valve 15; a first defrost valve 16 is provided on each defrost-coolant line 7 connected to the defrost-coolant loop 9. By providing the first heat extraction valve 15 and the first defrost valve 16 on the hot coolant line and the defrost coolant line 7, respectively, the on-off between the hot coolant line and the hot coolant loop 8, and between the defrost coolant line 7 and the defrost coolant loop 9, respectively, can be controlled.
In this embodiment, as shown in fig. 1, a second defrost valve 17 is provided on the defrost-coolant loop 9 for controlling the on-off of the solar collector 11.
As shown in fig. 1, in the present embodiment, a third defrost valve 18 is provided on a pipeline connecting the hot and cold water main pipe 4 and the defrost plate 10. The on-off state between the cold and hot water main pipe 4 and the defrosting plate exchanger 10 can be controlled.
In the present embodiment, solenoid valves are used for the first heat-extracting valve 15, the second heat-extracting valve 20, the first defrost valve 16, the second defrost valve 17 and the third defrost valve 18.
The following describes in detail five operation modes of the heat pump unit combining solar energy and air source in this embodiment:
Mode one-air energy heat pump normal heating mode
As shown in fig. 2, a schematic diagram of a first operation mode of the heat pump unit with solar energy and air source according to the present embodiment is shown, the working portion of the system is the dark line portion in fig. 2, and the non-working portion is the light line portion (hereinafter the same). When the system operates in the mode, the third defrosting valves 18 are turned off, the fans 5 in all three-medium heat exchange modules are turned on, all the first defrosting valves 16 are turned off, and all the first heat taking valves 15 are turned on. At this time, the heat in the air is transferred to the secondary refrigerant circulating in the heat-taking secondary refrigerant loop 8 at the position of the three-medium heat exchange module under the driving action of the fan 5, the heat is transported to the second heat exchanger 3, transferred to the refrigerant, and after the temperature grade is improved by the heat pump circulation module, the first heat exchanger 2 prepares high-temperature hot water to supply heat to the user side through the cold hot water main pipe 4.
Defrosting and heating mode of mode two-air energy heat pump
As shown in fig. 3, a schematic diagram of a second operation mode of the heat pump unit with solar energy and air source combination in this embodiment is shown, when the system operates in this mode, the fan 5 in the three-medium heat exchange module in a normal operation state is turned on, the corresponding first defrosting valve 16 is turned off, and the corresponding first heat extraction valve 15 is turned on; the fan 5 in the three-medium heat exchange module requiring defrosting is closed, the corresponding first defrosting valve 16 is turned on, and the corresponding first heat taking valve 15 is turned off; the heat-extracting side refrigerant pump 12 and the defrost side refrigerant pump 13 are simultaneously turned on. At this time, heat in the air is transferred into the secondary refrigerant in the heat-taking secondary refrigerant loop 8 through the three-medium heat exchange modules which are in normal operation, the heat is transported to the second heat exchanger 3 and transferred to the refrigerant, after the temperature grade is improved through the heat pump circulation module, high-temperature hot water is prepared by the first heat exchanger 2, and part of the high-temperature hot water supplies heat to the user side through the cold hot water main pipe 4; and the other part of heat is transported to the defrosting plate exchanger 10 and transferred into the refrigerating medium in the defrosting refrigerating medium loop 9, and is pumped to the three-medium heat exchange module needing defrosting through the refrigerating medium on the frosted side for defrosting treatment.
Mode three-solar direct heating mode
As shown in fig. 4, a schematic diagram of a third operation mode of the heat pump unit with solar energy and air source combination in this embodiment is shown, and when the system is operated in this mode, the fans 5 in all three-medium heat exchange modules are turned off, the corresponding first heat extraction valve 15 is turned off, the second defrost valve 17 is turned on, and the defrost-side coolant pump 13 and the solar coolant pump 14 are turned on. At this time, the heat produced by the solar heat collector 11 enters the defrosting coolant pipeline 7, and the coolant is transferred to the hot and cold water drying pipe 4 after heat exchange by the defrosting plate exchanger 10 under the driving action of the defrosting side coolant pump 13 and the solar coolant pump 14, so as to supply heat to the user side.
Mode four-solar air energy combined heat pump heating mode
Fig. 5 is a schematic diagram of a fourth operation mode of the heat pump unit with solar energy and air source combination according to the present embodiment, in which the heat pump cycle module is a heating mode. The third defrost valve 18 is closed, the fans 5 in all three medium heat exchange modules are opened, the corresponding first defrost valves 16 are opened, and all the first heat extraction valves 15 are turned on. The second defrost valves 17 corresponding to all solar collectors 11 are turned on. The heat-extracting side coolant pump 12 is turned on, the defrosting side coolant pump 13 is turned off, and the solar coolant pump 14 is turned on. At this time, the solar heat is transported to each three-medium heat exchange module, and is transferred to the secondary refrigerant circulating in the heat-taking secondary refrigerant loop 8 together with the heat in the air at each three-medium heat exchange module, the heat is transported to the second heat exchanger 3, and is transferred to the refrigerant, and after the temperature grade is improved by the heat pump circulation module, the first heat exchanger 2 prepares high-temperature hot water to supply heat to the user side through the cold hot water main pipe 4.
Mode five-air energy heating and solar defrosting modes
As shown in fig. 6, a schematic diagram of a fifth operation mode of the heat pump unit combining solar energy and an air source in this embodiment is shown, in this mode, the heat pump cycle module is a heating mode, fans 5 in all the three-medium heat exchange modules that normally operate are turned on, corresponding first defrosting valves 16 are turned off, and corresponding first heat extraction valves 15 are turned on; the fan 5 of the three-medium heat exchange module requiring defrosting is turned off, the corresponding first defrosting valve 16 is turned on, and the corresponding first heat taking valve 15 is turned off. The second defrost valve 17 of the solar collector 11 is turned on, the heat-extracting side coolant pump 12 and the solar coolant pump 14 are turned on, and the defrost side coolant pump 13 is turned off. At this time, heat in the air is transferred to the secondary refrigerant circulating in the heat-taking secondary refrigerant loop 8 at each three-medium heat exchange module in normal operation, the heat is transferred to the second heat exchanger 3, transferred to the refrigerant, and after the temperature grade is improved by the heat pump circulation module, high-temperature hot water is prepared by the first heat exchanger 2, and heat is supplied to the user side through the cold and hot water main pipe 4. The heat produced by the solar heat collector 11 enters the defrosting secondary refrigerant loop 9, and the three-medium heat exchange module to be defrosted is defrosted under the power provided by the solar secondary refrigerant pump 14.
Example 2
Fig. 7 is a schematic structural diagram of a heat pump unit combining solar energy and an air source according to the present embodiment. In this embodiment, the defrosting plate exchanger 10 is connected in series with the first heat exchanger 2 through the cold and hot water main 4, and then connected to the cold and hot water main through the third defrosting valve 18. In this way, when the system operates in the defrosting and heating mode of the air-source heat pump, the heat produced by the first heat exchanger 2 is supplied to the user first, and then is recycled to the defrosting plate 10 to defrost the frosted three-medium heat exchange module, as shown in fig. 8.
Example 3
Fig. 9 is a schematic structural diagram of a heat pump unit combining solar energy and an air source according to the present embodiment. In this embodiment, the defrosting plate exchanger 10 and the first heat exchanger 2 are respectively and independently connected to the cold and hot water main pipe 4 (the defrosting plate exchanger 10 is connected to the cold and hot water main pipe of the cold and hot water main pipe 4, and the first heat exchanger 2 is connected to the hot water main pipe of the cold and hot water main pipe 4), and then are connected to each other through a pipeline with the third defrosting valve 18. In this case, the defrosting plate exchanger 10 and the first heat exchanger 2 can be heated and cooled, respectively, and supplied to the user side. In addition, in this embodiment, the four-way valve 22 for changing the flow direction of the refrigerant is provided in the heat pump cycle module, and the heat pump cycle module can switch between the heating mode in winter and the cooling mode in summer. Two refrigerant channels are arranged in the four-way valve, and the two refrigerant channels are specifically as follows:
During refrigeration, one of the refrigerant channels is connected with the inlet of the compressor 1 and the first heat exchanger 2; the other refrigerant passage connects the outlet of the compressor 1 and the second heat exchanger 3;
During heating, one refrigerant channel is connected with the inlet of the compressor 1 and the second heat exchanger 3; the other refrigerant passage connects the outlet of the compressor and the first heat exchanger 2.
The following describes two operation modes of the heat pump unit combining solar energy and air source of the present embodiment.
Mode one-solar heating and heat pump refrigerating mode
Fig. 10 is a schematic diagram of a heat pump unit operating mode of the solar energy and air source combination according to the present embodiment, in which the heat pump cycle module operates in refrigeration mode. The fans 5 of all three-medium heat exchange modules are started, the corresponding first heat taking valves 15 are turned on, and the corresponding first defrosting valves 16 are turned off; all of the second defrost valves 17 are on and the third defrost valve 18 is off, turning on the heat-extracting side coolant pump 12, defrost side coolant pump 12, and solar coolant pump 14. At this time, the first heat exchanger 2 of the heat pump cycle module supplies cold to the user side, and the solar heat collector 11 generates heat to supply heat to the user side through the defrosting plate exchanger 10.
Mode two-heat pump refrigeration recovery condensation hot mode
Fig. 11 is a schematic diagram of the solar energy and air source combined heat pump unit according to the present embodiment in the second operation mode, in which the heat pump cycle module operates in refrigeration mode. The fans 5 of all three-medium heat exchange modules are started, the corresponding first heat taking valves 15 are conducted, and the corresponding first defrosting valves 16 are conducted; all the second defrost valves 17 are off and the third defrost valve 18 is off. The heat-extracting side coolant pump 12 and the defrost side coolant pump 13 are turned on, and the solar coolant pump 14 is turned off. At this time, the heat pump circulation module supplies cold to the user side, heat of the user side is transferred to the heat pump circulation module after being subjected to heat exchange by the first heat exchanger 2, the temperature grade of the heat pump circulation module is improved, the heat is discharged to the heat-taking refrigerating medium loop 12, a part of the heat is subjected to heat exchange at the three-medium heat exchange module to the defrosting refrigerating medium loop 13, and the heat is transferred to the cold and hot water main pipe 4 to supply heat to the user side after being subjected to heat exchange by the defrosting plate 10; and the other part of heat is discharged to the external environment at the three-medium heat exchange module.
Example 4
Fig. 12 is a schematic structural diagram of a heat pump unit combining solar energy and an air source according to the present embodiment. In this embodiment, the unit further comprises at least one cooling device 19, and the cooling devices 19 are arranged in parallel at two ends of the second heat exchanger 3 on the heat-extracting coolant loop 8. By providing the cooling device 19 to assist in cooling the coolant, more efficient refrigeration in summer than in a conventional air-cooled heat pump can be achieved. In this embodiment, the cooling device 19 is a cooling tower.
According to the heat pump unit combining solar energy and an air source, the common air cooling module of the system in the background art is replaced by the three-medium heat exchange modules, two secondary refrigerant pipelines are arranged in each three-medium heat exchange module, heat exchange is carried out between the two secondary refrigerant pipelines and air flowing outside the secondary refrigerant pipelines through driving of the fan 5, and the heat pump unit is connected to a defrosting secondary refrigerant loop and a heat-taking secondary refrigerant loop through secondary refrigerant branch pipes respectively. The form that a single secondary refrigerant pipeline of the air cooling module of the traditional system is simultaneously connected with two secondary refrigerant loops is avoided, so that the number of on-off valves is reduced; the two secondary refrigerant loops are not communicated, and the electric valve with high price can be replaced by an inexpensive electromagnetic valve, so that the cost is saved; control management of standardized modules becomes simpler. The unit can be switched under the multiple modes of the normal heating mode of the air energy heat pump, the defrosting and heating mode of the air energy heat pump, the direct solar heating mode, the solar air energy combined heat pump heating mode, the air energy heating mode, the solar defrosting mode, the refrigerating and recycling condensing mode, the solar heating mode, the heat pump refrigerating mode and the heat pump refrigerating and recycling condensing mode through the combined action of the driving pumps and the valves, so that the air energy heat pump defrosting and heating unit is convenient for users to use. The defrosting secondary refrigerant loop and the heat taking secondary refrigerant loop are two independent loops, can operate at different temperatures, and when heating is performed in winter, the solar heat collector is connected to the defrosting secondary refrigerant loop with relatively high temperature, so that frosted air cooling modules can be directly defrosted. The heat-taking secondary refrigerant loop is connected with a cooling tower, so that high-efficiency refrigeration in summer can be realized. Two secondary refrigerant pipelines in the three-medium heat exchange module can exchange heat with each other, and heat exchange recovery of condensation heat at the secondary refrigerant pipelines is realized during refrigeration in summer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A heat pump assembly for combining solar energy with an air source, comprising:
The heat pump circulation module comprises a compressor, a first heat exchanger, a throttling device and a second heat exchanger which are sequentially connected, wherein a cold and hot water main pipe is connected to the first heat exchanger;
the three-medium heat exchange modules comprise fans, a heat-taking secondary refrigerant pipeline and a defrosting secondary refrigerant pipeline, wherein the fans are used for driving air to exchange heat with the heat-taking secondary refrigerant pipeline and the defrosting secondary refrigerant pipeline;
a coolant loop comprising a hot coolant loop and a defrost coolant loop;
A defrosting plate exchanger, one side of which is arranged on the defrosting secondary refrigerant loop and the other side of which is connected with the cold and hot water main pipe;
At least one solar heat collector which is arranged at two ends of the defrosting plate exchanger on the defrosting secondary refrigerant ring in parallel;
All the heat-taking secondary refrigerant pipelines are arranged at two ends of the second heat exchanger on the heat-taking secondary refrigerant loop in parallel, and all the defrosting secondary refrigerant pipelines are arranged at two ends of the defrosting plate exchanger on the defrosting secondary refrigerant loop in parallel;
A heat-taking side secondary refrigerant pump is arranged between the second heat exchanger and the three-medium heat exchange module closest to the second heat exchanger on the heat-taking secondary refrigerant loop;
a defrosting side secondary refrigerant pump is arranged on the defrosting secondary refrigerant loop and between the defrosting plate exchanger and the three-medium heat exchange module closest to the defrosting plate exchanger;
The defrosting secondary refrigerant loop is provided with a solar secondary refrigerant pump which is used for driving secondary refrigerant to circulate between the defrosting secondary refrigerant loop and the solar secondary refrigerant pump;
A first heat extraction valve is arranged on each heat extraction secondary refrigerant pipeline connected with the heat extraction secondary refrigerant loop;
a first defrost valve is arranged on each defrost-coolant line connected to the defrost-coolant loop;
the defrosting secondary refrigerant loop is provided with a second defrosting valve for controlling the on-off of the solar heat collector;
and a third defrosting valve is arranged on a pipeline in which the cold and hot water main pipe is connected with the defrosting plate in a replacement way.
2. The solar and air source combined heat pump assembly of claim 1, wherein: the defrosting plate exchanger and the first heat exchanger are respectively and independently connected to the cold and hot water main pipe; or the defrosting plate is connected with the first heat exchanger in parallel through a hot water pipeline and then connected to the cold and hot water main pipe; or the defrosting plate is connected with the first heat exchanger in series through a hot water pipeline and then connected to the cold and hot water main pipe.
3. The solar and air source combined heat pump assembly of claim 1, wherein: the cooling device is arranged at two ends of the second heat exchanger on the heat-taking secondary refrigerant loop in parallel.
4. A solar energy and air source combined heat pump assembly according to claim 3, wherein: and a second heat-taking valve for controlling the on-off of the cooling device is arranged on the heat-taking secondary refrigerant loop.
5. The solar-air source combined heat pump assembly according to any one of claims 1-4, wherein: and the heat pump cycle module is provided with a four-way valve for changing the flow direction of the refrigerant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211485836.6A CN115789993B (en) | 2022-11-24 | 2022-11-24 | Heat pump unit combining solar energy and air source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211485836.6A CN115789993B (en) | 2022-11-24 | 2022-11-24 | Heat pump unit combining solar energy and air source |
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| CN115789993A CN115789993A (en) | 2023-03-14 |
| CN115789993B true CN115789993B (en) | 2024-05-28 |
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| KR20200032345A (en) * | 2018-09-18 | 2020-03-26 | 주식회사 탑솔 | Solar heat pump system with PVT collector connected |
| CN115046310A (en) * | 2022-07-12 | 2022-09-13 | 北京卡林新能源技术有限公司 | Split type high-efficient defrosting air source heat pump set |
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2022
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| CN1389688A (en) * | 2002-06-27 | 2003-01-08 | 上海交通大学 | Wind-cooling heat pump set for solar water heating |
| KR20080084734A (en) * | 2007-03-15 | 2008-09-19 | 아이신세이끼가부시끼가이샤 | Refrigeration cycle apparatus |
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| CN115789993A (en) | 2023-03-14 |
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