CN214199280U - Air source heat pump unit with heat pipe defrosting function - Google Patents
Air source heat pump unit with heat pipe defrosting function Download PDFInfo
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- CN214199280U CN214199280U CN202022746716.XU CN202022746716U CN214199280U CN 214199280 U CN214199280 U CN 214199280U CN 202022746716 U CN202022746716 U CN 202022746716U CN 214199280 U CN214199280 U CN 214199280U
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Abstract
The utility model provides an air source heat pump unit with heat pipe defrosting function, which comprises an air heat exchanger and a first pipeline, wherein the air heat exchanger is sequentially connected with a liquid pipe two-way valve, a water heat exchanger and a gas pipe two-way valve through the first pipeline; the first pipeline between the output end of the water heat exchanger and the liquid pipe two-way valve is connected with one end of a second pipeline, the other end of the second pipeline is connected between the liquid pipe two-way valve and the air heat exchanger, an expansion valve is connected in series on the second pipeline, the input end of the water heat exchanger and the first pipeline between the air pipe two-way valve are connected with one end of a third pipeline, the other end of the third pipeline is connected between the air pipe two-way valve and the air heat exchanger, and a compressor is connected in series on the third pipeline. The utility model discloses a take air source heat pump set of heat pipe defrosting function and defrosting method thereof, when the defrosting of operation heat pipe mode, the surface temperature of wind heat exchanger is far less than the reverse circulation scheme of tradition, and the heat loss is showing and is reducing, changes the frost process and does not start compressor and fan, does not have almost the power consumption, and the heat comes from hot water completely, improves comprehensive operating efficiency.
Description
Technical Field
The utility model relates to a refrigeration heat pump technical field especially relates to a take air source heat pump set of heat pipe defrosting function.
Background
The air source heat pump cold and hot water unit needs defrosting when heating in winter, and the prior art adopts a reverse cycle defrosting method, namely, the reverse cycle defrosting method is switched to a refrigeration mode, heat is absorbed from a water system, the heat is transferred to an air heat exchanger by a compressor, so that the surface temperature of the air heat exchanger is raised, and frost is melted and removed. The defrosting method is simple and feasible, has high defrosting speed and guaranteed effect, but has the following problems:
1) the air heat exchanger heats the air to a higher temperature which can reach more than 50 ℃, and because the air temperature is low in winter, a large amount of heat is dissipated into the air, and the lower the air temperature is, the greater the heat dissipation loss is. In addition, because the phenomenon of frost-free and wrong defrosting exists in a large quantity, the heat loss caused by reverse circulation defrosting is larger;
2) during defrosting, valves are switched, fluid is reversed, and the pressure and temperature of the system are changed violently, so that impact is caused on all parts of the system. And the normal oil return of the press is not facilitated, and the whole service life of the unit is shortened. Extra noise is also generated, which aggravates the noise problem of the air source heat pump;
3) the air source heat pump cold and hot water unit can refrigerate and heat, but at present, a large number of single heating requirements exist, such as heat pump water heaters, the requirement that a centralized coal-fired boiler is transformed into an air source heat pump, and the like. In these scenes, refrigeration is not needed, and originally, switching parts such as a four-way valve and the like can be omitted, so that the system and the control are simplified. However, due to the reverse cycle defrosting method, the mechanisms must be reserved, and in fact, the four-way valve is used as a vulnerable part, so that not only is the operation reliability reduced, but also the operation energy efficiency of the system is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of existence among the prior art, provide a take air source heat pump set of heat pipe defrosting function, the heat loss is showing and is reducing, improves comprehensive operating efficiency.
The air source heat pump water chiller-heater unit usually adopts an up-down structure, the air heat exchanger is positioned at the upper part, a side air-out or top air-out mode is adopted, other components comprise a compressor, a water heat exchanger and an expansion valve, etc. are positioned at the lower part, the air heat exchanger of the up-down structure is positioned at the upper part, the water heat exchanger is positioned at the lower part, the height difference of the natural circulation of the heat pipes is naturally possessed, meanwhile, during heat supply in winter, the water temperature of the water heat exchanger is higher and is generally not lower than 40 ℃, the temperature of the air heat exchanger after frosting is not higher than 0 ℃, and the temperature difference of the natural circulation of the heat pipes is also possessed, therefore, the structures of the air heat exchanger and the water heat exchanger are only required to be optimized to a certain extent, and the heat pipes are directly connected, the natural circulation of the heat pipes can be realized, and the heat in the water is transferred to the air heat exchanger for defrosting.
The utility model adopts the technical proposal that:
an air source heat pump unit with a heat pipe defrosting function comprises an air heat exchanger and a first pipeline, wherein the air heat exchanger is sequentially connected with a liquid pipe two-way valve, a water heat exchanger and a gas pipe two-way valve through the first pipeline; the air-conditioning system is characterized in that one end of a second pipeline is connected to a first pipeline between the output end of the water heat exchanger and the liquid pipe two-way valve, the other end of the second pipeline is connected between the liquid pipe two-way valve and the air heat exchanger, an expansion valve is connected to the second pipeline in series, one end of a third pipeline is connected to the input end of the water heat exchanger and the first pipeline between the air pipe two-way valves, the other end of the third pipeline is connected between the air pipe two-way valve and the air heat exchanger, and a compressor is connected to the third pipeline in series.
Preferably, the air source heat pump unit with the heat pipe defrosting function further comprises a four-way valve, wherein the first end and the second end of the four-way valve are connected with the two ends of the compressor; and the fourth end of the four-way valve is connected between the air pipe two-way valve and the air heat exchanger through a fifth pipeline.
Preferably, the air source heat pump unit with the heat pipe defrosting function is characterized in that the air heat exchanger is arranged above the water heat exchanger.
A defrosting method of an air source heat pump unit with a heat pipe defrosting function comprises the following steps:
1) when the heat pump unit is in a heating state, the liquid pipe two-way valve and the gas pipe two-way valve are closed, the compressor, the expansion valve and the air heat exchanger are started, and when the heat pump unit is in a defrosting state, the compressor and the air heat exchanger are closed, and t is kept1Time;
2) opening an air pipe two-way valve and a liquid pipe two-way valve, opening an air heat exchanger and a water heat exchanger, closing an expansion valve, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger1And outlet refrigerant temperature T2And water temperature T at inlet of water heat exchanger3And the outlet water temperature T4And when any one of the following conditions is reached, the defrosting is finished:
duration of defrosting>tm；
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
Wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) And after defrosting is finished, closing the liquid pipe two-way valve and the air pipe two-way valve.
A defrosting method of an air source heat pump unit with a heat pipe defrosting function comprises the following steps:
1) when the heat pump unit is in a heating state, the liquid pipe two-way valve and the gas pipe two-way valve are closedThe compressor, the expansion valve and the air heat exchanger are started, the four-way valve connects the air outlet of the compressor with the water heat exchanger and connects the air inlet of the compressor with the air heat exchanger, and when the heat pump unit is in a defrosting state, the compressor and the air heat exchanger are closed to keep t1Time;
2) opening an air pipe two-way valve and a liquid pipe two-way valve, opening an air heat exchanger and a water heat exchanger, closing an expansion valve, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger1And outlet refrigerant temperature T2And water temperature T at inlet of water heat exchanger3And the outlet water temperature T4When the defrosting time is accumulated to tmIf any one of the following conditions is met, performing the step 4), otherwise, performing the step 5);
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) After defrosting is finished, the liquid pipe two-way valve and the air pipe two-way valve are closed;
5) closing the air pipe two-way valve and the liquid pipe two-way valve, switching the system to a traditional reverse cycle defrosting mode, adjusting the expansion valve to defrosting opening, starting the compressor, switching the four-way valve to connect the air outlet of the compressor with the air heat exchanger, connecting the air suction port of the compressor with the water heat exchanger, and starting timing; and finishing defrosting if any one of the following conditions is met:
duration of defrosting>tm1；
T2>Tsf1；
Wherein, tm1，Tsf1All the parameters are system variable parameters and can be adjusted at will according to actual conditions.
The utility model has the advantages that:
(1) the utility model discloses a take air source heat pump set of heat pipe defrosting function, when the defrosting of operation heat pipe mode, the surface temperature of wind heat exchanger is far less than the reverse circulation scheme of tradition, and the heat loss is showing and is reducing, changes the frost process simultaneously and does not start compressor and fan, does not have almost the power consumption, and the heat comes from hot water completely, improves comprehensive operating efficiency.
(2) The defrosting process has no high-low pressure switching, eliminates the impact and fluid reversing of the traditional defrosting mode, effectively protects the operation safety of each part, prolongs the service life and avoids the defrosting noise.
(3) For a single-heat type air source heat pump cold and hot water unit, a four-way valve can be omitted according to actual conditions, the structure is simplified, and the operation reliability and the operation efficiency are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic view of embodiment 2 of the present invention.
Fig. 2 is a schematic view of embodiment 3 of the present invention.
FIG. 3 is a schematic diagram of temperature measurement point distribution during defrost mode.
The numbering in the figures is as follows: 1-a compressor; 2-a water heat exchanger; 3-an expansion valve; 4-wind heat exchanger; 5-liquid pipe two-way valve; 6-gas pipe two-way valve; 7-a four-way valve; 8-a first pipeline; 9-a second conduit; 10-a third conduit; 11-a fourth conduit; 12-fourth conduit.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
As shown in fig. 1 and fig. 3, the air source heat pump unit with a heat pipe defrosting function in this embodiment is characterized by comprising an air heat exchanger 4 and a first pipeline 8, wherein the air heat exchanger 4 is sequentially connected with a liquid pipe two-way valve 5, a water heat exchanger 2 and a gas pipe two-way valve 6 through the first pipeline 8; the output of water heat exchanger 2 with connect second pipeline 9 one end on the first pipeline between liquid pipe two-way valve 5, the second pipeline 9 other end is connected between liquid pipe two-way valve 5 and wind heat exchanger 4, it has expansion valve 3 to establish ties on the second pipeline 9, the input of water heat exchanger 2 with connect third pipeline 10 one end on the first pipeline between trachea two-way valve 6, the third pipeline 10 other end is connected between trachea two-way valve 6 and wind heat exchanger 4, it has compressor 1 to establish ties on the third pipeline 10.
Wherein, the wind heat exchanger 4 is arranged above the water heat exchanger 2.
As shown in fig. 1 and 3, the embodiment is a single heating unit without a cooling function, such as a heat pump water heater, a boiler instead of a heat pump heating unit, and the like; the unit has two operation modes: the heat pump heating system comprises a heat pump heating mode and a heat pipe defrosting mode, wherein in the heat pump heating mode, the liquid pipe two-way valve and the air pipe two-way valve are both closed, at the moment, the compressor, the water heat exchanger, the expansion valve and the air heat exchanger form a heat pump cycle, and the water heat exchanger is used as a condenser and is connected with a tail end demand side to supply circulating hot water for the condenser. The air heat exchanger is used as an evaporator, and the unit is switched to a heat pipe defrosting mode when defrosting is needed along with the increase of frosting of the air heat exchanger. In the mode, the liquid pipe two-way valve and the gas pipe two-way valve are opened, the air heat exchanger and the water heat exchanger are directly communicated to form a separated heat pipe system, and hot water heats and evaporates a refrigerant in the water heat exchanger and enters the air heat exchanger through the gas pipe two-way valve because a water path of the water heat exchanger keeps circulating. The air heat exchanger is frosted, the surface temperature is low (not higher than 0 ℃), so the refrigerant vapor is condensed into liquid through the air heat exchanger, and returns to the water heat exchanger through the liquid pipe two-way valve under the action of gravity. Through the heat pipe operation mode driven by the temperature difference and the height difference, heat in circulating water is transferred to the surface of the wind heat exchanger, so that the temperature of a frost layer is gradually increased and melted.
A defrosting method of an air source heat pump unit with a heat pipe defrosting function comprises the following steps:
1) when the heat pump unit is in a heating state, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are closed, the compressor 1, the expansion valve 3 and the air heat exchanger 4 are started, and when the heat pump unit is in a heating stateIn the defrosting state, the compressor 1 and the air heat exchanger 4 are closed, and t is kept1Time;
2) opening an air pipe two-way valve 6 and a liquid pipe two-way valve 5, opening an air heat exchanger 4 and a water heat exchanger 2, closing an expansion valve 3, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger 41And outlet refrigerant temperature T2And the water temperature T at the inlet of the water heat exchanger 23And the outlet water temperature T4And when any one of the following conditions is reached, the defrosting is finished:
duration of defrosting>tm；
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
Wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) And after defrosting is finished, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are closed.
The heat pump unit of the embodiment does not have the function of reverse circulation defrosting, defrosting completely depends on a heat pipe mode, and the problems of reliability, heat loss, high energy consumption and the like caused by reverse circulation defrosting are completely eliminated. However, the heat pipe mode is greatly influenced by the environment and the water temperature, the defrosting heat is unstable, and the defrosting time is possibly long. Therefore, the mode is suitable for occasions with higher water temperature, more units and larger water system inertia, and the outdoor air temperature is not too low.
Example 2
As shown in fig. 2 and fig. 3, the air source heat pump unit with a heat pipe defrosting function in this embodiment is characterized by comprising an air heat exchanger 4 and a first pipeline 8, wherein the air heat exchanger 4 is sequentially connected with a liquid pipe two-way valve 5, a water heat exchanger 2 and a gas pipe two-way valve 6 through the first pipeline 8; the output of water heat exchanger 2 with connect second pipeline 9 one end on the first pipeline between liquid pipe two-way valve 5, the second pipeline 9 other end is connected between liquid pipe two-way valve 5 and wind heat exchanger 4, it has expansion valve 3 to establish ties on the second pipeline 9, the input of water heat exchanger 2 with connect third pipeline 10 one end on the first pipeline between trachea two-way valve 6, the third pipeline 10 other end is connected between trachea two-way valve 6 and wind heat exchanger 4, it has compressor 1 to establish ties on the third pipeline 10.
The compressor also comprises a four-way valve 7, wherein the first end and the second end of the four-way valve 7 are connected with the two ends of the compressor 1; and a third end of the four-way valve 7 is connected between the air pipe two-way valve 6 and the input end of the water heat exchanger 2 through a fourth pipeline 11, and a fourth end of the four-way valve 7 is connected between the air pipe two-way valve 6 and the air heat exchanger 4 through a fifth pipeline 12.
Wherein, the wind heat exchanger 4 is arranged above the water heat exchanger 2.
As shown in fig. 2 and 3, in the present embodiment, since the four-way valve is provided in comparison with embodiment 1, the unit includes a heat pump cooling mode, a heat pump heating mode, a reverse cycle defrosting mode, and a heat pipe defrosting mode.
The liquid pipe two-way valve and the air pipe two-way valve are kept closed in three modes of heat pump refrigeration, heat pump heating and reverse cycle defrosting, and the operation of the two-way valve is the same as that of a conventional air source heat pump.
In the heat pipe circulation defrosting mode, the compressor is closed, the fan is closed, the liquid pipe two-way valve and the air pipe two-way valve are opened, and at the moment, the air heat exchanger and the water heat exchanger are directly communicated and form separated heat pipe circulation. The defrosting principle is the same as that of the first embodiment. The unit adopts a defrosting method of 'heat pipe defrosting is prior', and the process is as follows:
a defrosting method of an air source heat pump unit with a heat pipe defrosting function comprises the following steps:
1) when the heat pump unit is in a heating state, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are closed, the compressor 1, the expansion valve 3 and the air heat exchanger 4 are started, the four-way valve 9 connects the air outlet of the compressor 1 with the water heat exchanger 2 and connects the air inlet of the compressor 1 with the air heat exchanger 4, when the heat pump unit is in a defrosting state, the compressor 1 and the air heat exchanger 4 are closed,hold t1Time;
2) opening an air pipe two-way valve 6 and a liquid pipe two-way valve 5, opening an air heat exchanger 4 and a water heat exchanger 2, closing an expansion valve 3, starting a heat pipe defrosting mode, and starting to calculate defrosting duration;
3) when the defrosting time reaches t2Detecting the temperature T of the refrigerant at the inlet of the air heat exchanger 41And outlet refrigerant temperature T2And the water temperature T at the inlet of the water heat exchanger 23And the outlet water temperature T4When the defrosting time is accumulated to tmIf any one of the following conditions is met, performing the step 4), otherwise, performing the step 5);
T2>Tsf；
T1-T2<Tdf；
T4-T3<Tdw；
wherein, t1，t2，tm，Tsf，Tdf，TdwAll the parameters are system variable parameters and can be adjusted at will according to actual conditions.
4) After defrosting is finished, the liquid pipe two-way valve 5 and the gas pipe two-way valve 6 are closed;
5) the air pipe two-way valve 6 and the liquid pipe two-way valve 5 are closed, the system is switched to a traditional reverse circulation defrosting mode, the expansion valve 3 is adjusted to the defrosting opening degree, the compressor 1 is started, the four-way valve 9 is switched to connect the air outlet of the compressor 1 with the air heat exchanger 4, connect the air suction port of the compressor 1 with the water heat exchanger 2, and start timing; and finishing defrosting if any one of the following conditions is met:
duration of defrosting>tm1；
T2>Tsf1；
Wherein, tm1，Tsf1All the parameters are system variable parameters and can be adjusted at will according to actual conditions.
The defrosting method preferentially adopts a heat pipe defrosting mode to reduce defrosting energy consumption, and if the heat pipe mode can ensure thorough defrosting, the reverse cycle defrosting mode is not operated. If the defrosting is not thorough due to insufficient capacity of the heat pipe or insufficient defrosting time, the reverse circulation defrosting mode is switched to ensure that the defrosting is rapid and thorough.
Compared with the embodiment 1, the method has the defects that the unit needs to be provided with a four-way valve, and the system and the control are slightly complicated. The defrosting device has the advantages of various functional modes, wider application, reverse cycle defrosting mode and no limitation of environment and water temperature.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (3)
1. The air source heat pump unit with the heat pipe defrosting function is characterized by comprising an air heat exchanger (4) and a first pipeline (8), wherein the air heat exchanger (4) is sequentially connected with a liquid pipe two-way valve (5), a water heat exchanger (2) and an air pipe two-way valve (6) through the first pipeline (8); the output of water heat exchanger (2) with connect second pipeline (9) one end on the first pipeline between liquid pipe two-way valve (5), second pipeline (9) other end is connected between liquid pipe two-way valve (5) and air heat exchanger (4), it has expansion valve (3) to establish ties on second pipeline (9), the input of water heat exchanger (2) with connect third pipeline (10) one end on the first pipeline between trachea two-way valve (6), third pipeline (10) other end is connected between trachea two-way valve (6) and air heat exchanger (4), it has compressor (1) to establish ties on third pipeline (10).
2. The air source heat pump unit with the heat pipe defrosting function as claimed in claim 1, further comprising a four-way valve (7), wherein the first end and the second end of the four-way valve (7) are connected with two ends of the compressor (1); the third end of the four-way valve (7) is connected between the air pipe two-way valve (6) and the input end of the water heat exchanger (2) through a fourth pipeline (11), and the fourth end of the four-way valve (7) is connected between the air pipe two-way valve (6) and the air heat exchanger (4) through a fifth pipeline (12).
3. The air source heat pump unit with the heat pipe defrosting function as claimed in claim 1, wherein the air heat exchanger (4) is arranged above the water heat exchanger (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022746716.XU CN214199280U (en) | 2020-11-24 | 2020-11-24 | Air source heat pump unit with heat pipe defrosting function |
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| CN202022746716.XU CN214199280U (en) | 2020-11-24 | 2020-11-24 | Air source heat pump unit with heat pipe defrosting function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460848A (en) * | 2020-11-24 | 2021-03-09 | 无锡同方人工环境有限公司 | Air source heat pump unit with heat pipe defrosting function and defrosting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460848A (en) * | 2020-11-24 | 2021-03-09 | 无锡同方人工环境有限公司 | Air source heat pump unit with heat pipe defrosting function and defrosting method thereof |
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