Cold recovery air conditioning unit
By designing a cold recovery air conditioning unit with three heat exchangers, the problem of unrecovered cold energy was solved, achieving efficient heating and cooling, improving system energy efficiency, and reducing energy waste during the defrosting process.
Patent Information
- Application Number
- CN202423068411.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-12
AI Technical Summary
In the existing technology, separate air conditioning units are used for places such as industrial plants or data centers that require cooling and for places such as office buildings that require heating. This results in the cooling capacity not being recovered and utilized, the system having low energy efficiency, poor heating performance at low ambient temperatures, and the defrosting process causing a decrease in heating capacity and water temperature fluctuations, leading to serious energy waste.
Design a cold recovery air conditioning unit comprising three heat exchangers: a first heat exchanger for exchanging with the external environment, a second heat exchanger for exchanging with the indoor environment of a first location, and a third heat exchanger for exchanging with the indoor environment of a second location. The refrigerant flow is controlled by a control valve group and an electronic expansion valve to achieve multiple operating modes to meet the heating and cooling needs of different locations and recover cold energy.
Improve the energy efficiency of air conditioning units, reduce the defrosting process, achieve effective recovery and utilization of cooling capacity, reduce energy waste, and improve system operating efficiency.
Smart Images
Figure CN223525295U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air conditioning equipment technical field especially relates to a cold recovery air conditioning unit with multiple purposes. BACKGROUND
[0002] Many industrial plants or data machine rooms and the like need to cool the equipment for cooling all the year round, and the air conditioning side of its office building needs to cool in summer and heat in winter. The scheme adopted by most similar places at present is that a set of air conditioning unit for cooling all the year round is used on the side of the industrial plant or data center, and another set of separate heat pump product is used on the air conditioning side of the office building. In this way, two sets of independent air conditioning products are used, and when the air conditioning side heats in winter, the cold energy is not recycled and utilized, the system energy efficiency is low, and great energy waste is caused. Moreover, when the ambient temperature is low, the heating operation energy efficiency of the air conditioning side unit is relatively low, the heating effect is poor, in addition, the defrosting process also causes further attenuation of the heating capacity and fluctuation of the water temperature. With the increasing requirements of global energy saving and emission reduction and environmental protection, the industrial plant and data machine room are places with high energy consumption, therefore, it is necessary to optimize the air conditioning system scheme to reduce the system energy consumption. SUMMARY
[0003] The utility model aims at providing a cold recovery air conditioning unit which can meet the heating and cooling requirements of different places and effectively recycle the cold energy.
[0004] In order to realize the above-mentioned purpose, the utility model provides a cold recovery air conditioning unit, which comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger belonging to an outdoor unit, the first heat exchanger is used for heat exchange with the outdoor environment, the second heat exchanger is used for heat exchange with the indoor environment in a first place, the third heat exchanger is used for heat exchange with the indoor environment in a second place, the second heat exchanger is a cold / heat dual-function heat exchanger, and the third heat exchanger is a single cold heat exchanger.
[0005] The compressor is connected with the four-way valve, the four-way valve is connected with one refrigerant interface of the first heat exchanger through a first pipeline, the four-way valve is connected with one refrigerant interface of the second heat exchanger through a second pipeline, and the compressor is also connected with one refrigerant interface of the third heat exchanger through a third pipeline.
[0006] The other refrigerant interfaces of the first heat exchanger, the second heat exchanger and the third heat exchanger are connected with each other through a control pipeline, so that the refrigerant circulates and flows through any two or three of the first heat exchanger, the second heat exchanger and the third heat exchanger.
[0007] Preferably, the control pipeline comprises a first main pipeline connected with the refrigerant interface of the first heat exchanger, a second main pipeline connected with the second heat exchanger, and a third main pipeline connected with the third heat exchanger.
[0008] The first main pipeline and the third main pipeline are connected through a first branch pipeline and a second branch pipeline in parallel.
[0009] The second main pipeline is connected with the first branch pipeline and the second branch pipeline through a third branch pipeline and a fourth branch pipeline in parallel respectively; a first electronic expansion valve is arranged on the first branch pipeline, and a second electronic expansion valve is arranged on the third main pipeline; the first electronic expansion valve is located between the connection point of the third main pipeline and the first branch pipeline and the connection point of the fourth branch pipeline and the second branch pipeline; the control pipeline further comprises a control valve group for controlling the refrigerant to flow through the first branch pipeline, the second branch pipeline, the third branch pipeline and the fourth branch pipeline.
[0010] Preferably, the control valve group comprises a first one-way valve arranged on the first branch pipeline, a second one-way valve arranged on the second branch pipeline, a third one-way valve arranged on the third branch pipeline, and a fourth one-way valve arranged on the fourth branch pipeline; the first one-way valve controls the one-way flow of the refrigerant in the outflow direction of the first main pipeline; the second one-way valve controls the reverse flow of the refrigerant in the inflow direction of the first main pipeline; the third one-way valve controls the one-way flow of the refrigerant in the outflow direction of the second main pipeline; and the fourth one-way valve controls the one-way flow of the refrigerant in the inflow direction of the second main pipeline.
[0011] Preferably, when the air conditioning unit works in the first mode, the four-way valve controls the refrigerant to flow from the compressor to the first heat exchanger, and the first electronic expansion valve is in an open state and the second electronic expansion valve is in a closed state.
[0012] Preferably, when the air conditioning unit works in the second mode, the four-way valve controls the refrigerant to flow from the compressor to the first heat exchanger, and the first electronic expansion valve is in a closed state and the second electronic expansion valve is in an open state.
[0013] Preferably, when the air conditioning unit works in the third mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in an open state and the second electronic expansion valve is in a closed state.
[0014] Preferably, when the air conditioning unit works in the fourth mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in a closed state and the second electronic expansion valve is in an open state.
[0015] Preferably, when the air conditioning unit works in the fifth mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in an open state, and the second electronic expansion valve is in an open state.
[0016] Preferably, the first heat exchanger is a finned heat exchanger.
[0017] Preferably, the second heat exchanger and the third heat exchanger are water-cooled heat exchangers.
[0018] Compared with the prior art, the cold recovery air conditioning unit provided by the technical scheme of the present application is provided with three heat exchangers, namely a first heat exchanger for heat exchange with an external environment, a second heat exchanger for heat exchange with an indoor environment in a first place, and a third heat exchanger for heat exchange with an indoor environment in a second place, so that the first place can be provided with heating demand and the second place can be provided with cooling demand at the same time, and the cold quantity is recovered to cool the second place while meeting the heating demand of the first place, so that the energy efficiency of the air conditioning unit can be greatly improved, and the defrosting process can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a principle structure diagram of the air conditioning unit in the embodiment of the present application.
[0020] Figure 2 It is a refrigerant flow state diagram of the air conditioning unit working in the first mode in the embodiment of the present application.
[0021] Figure 3 It is a refrigerant flow state diagram of the air conditioning unit working in the second mode in the embodiment of the present application.
[0022] Figure 4 It is a refrigerant flow state diagram of the air conditioning unit working in the third mode in the embodiment of the present application.
[0023] Figure 5 It is a refrigerant flow state diagram of the air conditioning unit working in the fourth mode in the embodiment of the present application.
[0024] Figure 6 It is a refrigerant flow state diagram of the air conditioning unit working in the fifth mode in the embodiment of the present application. DETAILED DESCRIPTION
[0025] In order to make the technical content, structural features, achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.
[0026] The embodiment discloses a cold recovery air conditioning unit, which can provide heating and cooling requirements for two different places at the same time, and can recover the cold output of the heating side to the cooling side to improve the energy saving effect of the air conditioning unit.
[0027] As Figure 1 The air conditioning unit comprises a compressor M, a four-way valve Y, a first heat exchanger H1, a second heat exchanger H2 and a third heat exchanger H3.
[0028] The first heat exchanger H1 is used for heat exchange with the outdoor environment. The second heat exchanger H2 is used for heat exchange with the indoor environment in the first place, that is, the second heat exchanger H2 is connected with the indoor heat exchanger in the first place to adjust the indoor environment temperature of the first place. The third heat exchanger H3 is used for heat exchange with the indoor environment in the second place, that is, the second heat exchanger H2 is connected with the indoor heat exchanger in the second place to adjust the indoor environment temperature of the second place.
[0029] The second heat exchanger H2 is a cold / heat dual-function heat exchanger, so as to meet the cooling or heating requirements in the first place. The third heat exchanger H3 is a single cold heat exchanger, so as to meet the continuous cooling requirements in the second place.
[0030] Specifically, the first place can be an office place, for example, an office building; and the second place can be an industrial plant, a data center room or the like.
[0031] Further, the first heat exchanger H1 in the embodiment is preferably a wind-cooled fin heat exchanger, and the refrigerant is heat-exchanged with air in the external environment in the first heat exchanger H1. The second heat exchanger H2 and the third heat exchanger H3 are water-cooled heat exchangers, and the refrigerant is heat-exchanged with water in the shell pipe in the second heat exchanger H2 and the third heat exchanger H3. The water after heat exchange flows to the indoor heat exchanger.
[0032] The compressor M is connected with the four-way valve Y. The four-way valve Y is connected with one refrigerant interface of the first heat exchanger H1 through a first pipeline L1. The four-way valve Y is connected with one refrigerant interface of the second heat exchanger H2 through a second pipeline L2. The compressor M is further connected with one refrigerant interface of the third heat exchanger H3 through a third pipeline L3.
[0033] The other refrigerant interfaces of the first heat exchanger H1, the second heat exchanger H2 and the third heat exchanger H3 are connected with each other through a control pipeline, so that the refrigerant circulates through any two or three of the first heat exchanger H1, the second heat exchanger H2 and the third heat exchanger H3, thereby enabling the air conditioning unit to work in multiple modes, for example, a single heating mode for the first place, a single cooling mode for the second place, or a heating mode for the first place and a cooling mode for the second place at the same time.
[0034] Specifically, the control pipeline includes a first main pipeline N1 connected with the refrigerant interface of the first heat exchanger H1, a second main pipeline N2 connected with the second heat exchanger H2, and a third main pipeline N3 connected with the third heat exchanger H3.
[0035] The first main pipeline N1 and the third main pipeline N3 are connected through the first branch pipeline Z1 and the second branch pipeline Z2 in parallel.
[0036] The second main pipeline N2 is connected with the first branch pipeline Z1 and the second branch pipeline Z2 through the third branch pipeline Z3 and the fourth branch pipeline Z4 in parallel. The first electronic expansion valve P1 is arranged on the first branch pipeline Z1, the second electronic expansion valve P2 is arranged on the third main pipeline N3, and the first electronic expansion valve P1 is located between the connection point of the third main pipeline N3 and the first branch pipeline Z1 and the second branch pipeline Z2 and the connection point of the fourth branch pipeline Z4 and the second branch pipeline Z2. The control pipeline further includes a control valve group for controlling the refrigerant to flow through the first branch pipeline Z1, the second branch pipeline Z2, the third branch pipeline Z3, and the fourth branch pipeline Z4.
[0037] In the present embodiment, the flow route of the refrigerant is controlled through the control valve group, the four-way valve Y, and the first electronic expansion valve P1 and the second electronic expansion valve P2 to select any two or three of the first heat exchanger H1, the second heat exchanger H2, and the third heat exchanger H3 to enter a cooperative working state, so that the air conditioning unit enters different working modes.
[0038] More specifically, the control valve group includes a first one-way valve D1 arranged on the first branch pipeline Z1, a second one-way valve D2 arranged on the second branch pipeline Z2, a third one-way valve D3 arranged on the third branch pipeline Z3, and a fourth one-way valve D4 arranged on the fourth branch pipeline Z4. The first one-way valve D1 controls the one-way flow of the refrigerant in the outflow direction of the first main pipeline N1; the second one-way valve D2 controls the reverse flow of the refrigerant in the inflow direction of the first main pipeline N1; the third one-way valve D3 controls the one-way flow of the refrigerant in the outflow direction of the second main pipeline N2; and the fourth one-way valve D4 controls the one-way flow of the refrigerant in the inflow direction of the second main pipeline N2.
[0039] As Figure 2 When it is needed to make the air conditioning unit in the first mode, in which the air conditioning unit provides refrigeration demand for the first site and closes the refrigeration adjustment of the second site. Therefore, in the first mode, the four-way valve Y is not powered, the refrigerant flows from the compressor M into the first heat exchanger H1, and the first electronic expansion valve P1 is in an open state, and the second electronic expansion valve P2 is in a closed state.
[0040] In this embodiment, the refrigerant circulation route is as follows: compressor M -- four-way valve Y -- first pipeline L1 -- first heat exchanger H1 -- first main pipeline N1 -- first branch pipeline Z1 -- first electronic expansion valve P1 -- fourth branch pipeline Z4 -- second main pipeline N2 -- second heat exchanger H2 -- second pipeline L2 -- four-way valve Y -- compressor M.
[0041] like Figure 3 When the air conditioning unit needs to be in the second mode, in this mode, the air conditioning unit provides cooling for the second location and shuts off the cooling / heating regulation of the first location. In this second mode, the four-way valve Y is de-energized, controlling the refrigerant to flow from the compressor M into the first heat exchanger H1, and the first electronic expansion valve P1 is closed while the second electronic expansion valve P2 is open.
[0042] In this embodiment, the refrigerant circulation route is as follows: compressor M -- four-way valve Y -- first pipeline L1 -- first heat exchanger H1 -- first main pipeline N1 -- first branch pipeline Z1 -- third main pipeline N3 -- second electronic expansion valve P2 -- third heat exchanger H3 -- third pipeline L3 -- compressor M.
[0043] like Figure 4 When the air conditioning unit needs to be in the third mode, in this mode, the air conditioning unit provides heating for the first location and shuts off cooling for the second location. In this third mode, the four-way valve Y is energized, controlling the refrigerant to flow from the compressor M into the second heat exchanger H2, and the first electronic expansion valve P1 is open while the second electronic expansion valve P2 is closed.
[0044] In this embodiment, the refrigerant circulation route is as follows: compressor M -- four-way valve Y -- second pipeline L2 -- second heat exchanger H2 -- second main pipeline N2 -- third branch pipeline Z3 -- first electronic expansion valve P1 -- second branch pipeline Z2 -- first main pipeline N1 -- first heat exchanger H1 -- first pipeline L1 -- four-way valve Y -- compressor M.
[0045] like Figure 5 When the air conditioning unit needs to be in the fourth mode, in this mode, the air conditioning unit provides heating for the first location and cooling for the second location. In this fourth mode, the four-way valve Y is energized, controlling the refrigerant to flow from the compressor M into the second heat exchanger H2, and the first electronic expansion valve P1 is closed, while the second electronic expansion valve P2 is open.
[0046] In the embodiment, the circulating flow route of the refrigerant is: compressor M-four-way valve Y-second pipeline L2-second heat exchanger H2-second main line N2-third branch Z3-second electronic expansion valve P2-third main line N3-third heat exchanger H3-third pipeline L3-compressor M.
[0047] As Figure 6 When it is required to make the air conditioning unit in the fifth mode, in the fifth mode, the air conditioning unit provides the heating requirement for the first place, provides the refrigeration requirement for the second place, and can automatically balance the cold quantity provided for the second place.
[0048] In the embodiment, the circulating flow route of the refrigerant is: compressor M-four-way valve Y-second pipeline L2-second heat exchanger H2-second main line N2-third branch Z3-second electronic expansion valve P2-third main line N3-third heat exchanger H3-third pipeline L3-compressor M.
[0049] Therefore, the excess cold quantity flowing out of the second heat exchanger H2 enters the first heat exchanger H1 through the first electronic expansion valve P1 after flowing through the third branch Z3, and is released through the first heat exchanger H1, so that the automatic balancing of the cold quantity is realized.
[0050] In summary, the utility model discloses a kind of cold recovery air conditioning units, be equipped with three heat exchangers, it is respectively first heat exchanger H1 for carrying out heat exchange with external environment, second heat exchanger H2 for carrying out heat exchange with the indoor environment in the first place and third heat exchanger H3 for carrying out heat exchange with the indoor environment in the second place, like this, it can provide simultaneously to the first place provides heating requirement and provides refrigeration requirement to the second place, while meeting the heating requirement of the first place, cold quantity is recovered to the second place cooling, like this, not only can greatly improve the energy efficiency of air conditioning unit, also can effectively reduce defrosting process.
[0051] The above only discloses preferred embodiments of the utility model, of course, cannot limit the right scope of the utility model by this, therefore, equivalent changes made in the patent range of the utility model application still belong to the range covered by the utility model.
Claims
1. A cold recovery air conditioning unit characterized by, The air conditioning unit comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger is used for heat exchange with outdoor environment, the second heat exchanger is used for heat exchange with indoor environment in a first place, the third heat exchanger is used for heat exchange with indoor environment in a second place, the second heat exchanger is a cold / heat dual-function heat exchanger, and the third heat exchanger is a single cold heat exchanger; The compressor is connected with the four-way valve, the four-way valve is connected with one refrigerant interface of the first heat exchanger through a first pipeline, the four-way valve is connected with one refrigerant interface of the second heat exchanger through a second pipeline, and the compressor is further connected with one refrigerant interface of the third heat exchanger through a third pipeline; The other refrigerant interfaces of the first heat exchanger, the second heat exchanger and the third heat exchanger are connected with each other through a control pipeline, so that the refrigerant circulates and flows through any two or three of the first heat exchanger, the second heat exchanger and the third heat exchanger.
2. The cold recovery air conditioning unit of claim 1, wherein, The control pipeline comprises a first main pipeline connected with the refrigerant interface of the first heat exchanger, a second main pipeline connected with the second heat exchanger and a third main pipeline connected with the third heat exchanger; The first main pipeline and the third main pipeline are connected through a parallel first branch pipeline and a second branch pipeline; The second main pipeline is connected with the first branch pipeline and the second branch pipeline through a parallel third branch pipeline and a fourth branch pipeline respectively; a first electronic expansion valve is arranged on the first branch pipeline, a second electronic expansion valve is arranged on the third main pipeline, the first electronic expansion valve is located between the connection points of the third main pipeline and the first branch pipeline and the fourth branch pipeline and the second branch pipeline, and the control pipeline further comprises a control valve group for controlling the refrigerant to flow through the first branch pipeline, the second branch pipeline, the third branch pipeline and the fourth branch pipeline.
3. The cold recovery air conditioning unit of claim 2, wherein, The control valve group comprises a first one-way valve arranged on the first branch pipeline, a second one-way valve arranged on the second branch pipeline, a third one-way valve arranged on the third branch pipeline and a fourth one-way valve arranged on the fourth branch pipeline, the first one-way valve controls the one-way flow of the refrigerant in the outflow direction of the first main pipeline, the second one-way valve controls the reverse flow of the refrigerant in the inflow direction of the first main pipeline, the third one-way valve controls the one-way flow of the refrigerant in the outflow direction of the second main pipeline, and the fourth one-way valve controls the one-way flow of the refrigerant in the inflow direction of the second main pipeline.
4. The cold recovery air conditioning unit of claim 3, wherein, When the air conditioning unit works in the first mode, the four-way valve controls the refrigerant to flow from the compressor to the first heat exchanger, and the first electronic expansion valve is in an open state and the second electronic expansion valve is in a closed state.
5. The cold recovery air conditioning unit of claim 3, wherein, When the air conditioning unit works in the second mode, the four-way valve controls the refrigerant to flow from the compressor to the first heat exchanger, and the first electronic expansion valve is in a closed state and the second electronic expansion valve is in an open state.
6. The cold recovery air conditioning unit of claim 3, wherein, When the air conditioning unit works in the third mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in an open state, and the second electronic expansion valve is in a closed state.
7. The cold recovery air conditioning unit of claim 3, wherein, When the air conditioning unit works in the fourth mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in a closed state, and the second electronic expansion valve is in an open state.
8. The cold recovery air conditioning unit of claim 3, wherein, When the air conditioning unit works in the fifth mode, the four-way valve controls the refrigerant to flow from the compressor to the second heat exchanger, and the first electronic expansion valve is in an open state, and the second electronic expansion valve is in an open state.
9. The cold recovery air conditioning unit of claim 1, wherein, The first heat exchanger is a finned heat exchanger of air cooling type.
10. The cold recovery air conditioning unit of claim 1, wherein, The second heat exchanger and the third heat exchanger are water-cooled heat exchangers.