House air conditioning system utilizing water side residual cold

Abstract

The utility model discloses a house air-conditioning system utilizing water side residual cold, which comprises a first heat exchange unit and an air-conditioning terminal system which are mutually butted to form circulation, and the first heat exchange unit is provided with a compressor, an air-cooled condenser and an expansion valve which are connected in series through a refrigerant pipeline to form a first refrigeration circulation branch; the air conditioner terminal system at least comprises an air conditioner indoor unit. The system is characterized by further comprising a second heat exchange unit connected with the first heat exchange unit in parallel, and the second heat exchange unit is provided with a fluorine water plate heat exchanger and a fluorine pump which are connected in series to form a second refrigeration cycle branch; and the cold water inlet and the cold water outlet are externally connected with water pipes which are connected to a cooling water source and form a cold water circulating pipeline. The device has the advantages of being simple in structure, convenient to implement, capable of utilizing residual cold in other low-temperature fluid as a cold source to achieve cold supply, capable of saving energy loss, capable of improving system energy efficiency and the like.

Description

Technical Field

[0001] The utility model relates to an air conditioning device, in particular to a house air conditioning system utilizing water-side residual cooling. Background Art

[0002] Energy consumption and carbon emissions in the operation stage of buildings in my country account for about 1 / 4 of the total social total, of which air conditioning energy consumption accounts for about 50% of the total building energy consumption, which is the main component of building energy consumption. With the continuous growth of my country's economic level and the continuous improvement of residents' living conditions in recent years, air conditioning energy consumption will increase year by year. Therefore, improving air conditioning energy efficiency is an important way to achieve energy conservation and emission reduction.

[0003] Modern buildings, offices, shopping malls and other places usually use multi-split air conditioning systems (referred to as multi-split) to achieve indoor temperature control. Multi-split refers to an air conditioning system in which one outdoor unit is connected to two or more indoor units through piping, and uses direct expansion heat exchange with air to achieve cooling. Compared with the combined system of chillers and fan coils, multi-split systems rely on compressors, condensers, and expansion valves to achieve cooling, and cannot use natural cold sources or the residual cold of cold water in the building water pipe system or other cold sources to achieve free cooling. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a house air conditioning system that utilizes water-side residual cooling and can utilize residual cooling in other low-temperature fluids as a cold source to achieve cooling, thereby saving energy loss and improving system energy efficiency.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A house air conditioning system using water-side residual cooling, comprising a first heat exchange unit and an air conditioning terminal system connected to each other to form a cycle, wherein the first heat exchange unit is provided with a compressor, an air-cooled condenser and an expansion valve, the compressor, the air-cooled condenser and the expansion valve are connected in series through a refrigerant pipeline to form a first refrigeration cycle branch, a refrigerant is arranged in the first refrigeration cycle branch, the refrigerant is driven by the compressor to flow through the compressor, the air-cooled condenser and the expansion valve in sequence, and exchanges heat in a first air heat exchange channel of the air-cooled condenser;

[0007] The air conditioning terminal system includes at least one air conditioning indoor unit, the air conditioning indoor unit and the first refrigeration cycle branch are connected to form a cycle, the air conditioning indoor unit has a second air heat exchange channel, the second air heat exchange channel is provided with an indoor fan and an indoor heat exchanger, the indoor fan is used to drive the air flow in the second air heat exchange channel, so as to transfer the heat of the air in the second air heat exchange channel to the indoor heat exchanger;

[0008] The invention is characterized in that it also includes a second heat exchange unit arranged in parallel with the first heat exchange unit, the second heat exchange unit is provided with a fluorine-water plate heat exchanger and a fluorine pump, the fluorine-water plate heat exchanger and the fluorine pump are connected in series through a refrigerant pipeline to form a second refrigeration cycle branch, the fluorine pump is used to drive the refrigerant to flow through the fluorine-water plate heat exchanger and the fluorine pump in sequence, and exchange heat with the low-temperature fluid passing in parallel in the fluorine-water plate heat exchanger; the fluorine-water plate heat exchanger is also externally provided with a cold water inlet and a cold water outlet for the low-temperature fluid to flow in and out, and the cold water inlet and the cold water outlet are externally connected with water pipes connected to a cooling water source to form a cold water circulation pipeline.

[0009] Thus, in the present invention, a parallel heat exchange unit utilizing the residual cooling of the water side is added to the conventional house air conditioning structure that relies on the compressor heat pump for cooling. When necessary (when the temperature of the low-temperature fluid at the cold water inlet is lower than the air temperature in the first air heat exchange channel), the residual cooling in other low-temperature fluids can be used as a cold source to realize cooling of the house air conditioning system, thereby achieving the effect of saving energy loss and improving the energy efficiency of the system. During implementation, the types of low-temperature fluids entering and exiting the system through the cold water inlet and the cold water outlet include but are not limited to: water, ethylene glycol solution, calcium chloride solution, and sodium chloride solution.

[0010] Furthermore, a control valve is respectively provided on the first refrigeration cycle branch and the second refrigeration cycle branch near the parallel position.

[0011] In this way, it is convenient to control the opening and closing of the refrigerant pipeline between the air-conditioning terminal system and the first heat exchange unit and the second heat exchange unit through the control valve to achieve control switching. As another possible implementation method, a three-way control valve can be set at each of the two parallel positions to achieve control.

[0012] Furthermore, the second heat exchange unit also includes a temperature sensor, which is placed between the cold water inlet and the fluorine-water plate heat exchanger.

[0013] This makes it easy to detect the temperature of the low-temperature fluid at the cold water inlet to control the opening and closing of the valve.

[0014] Furthermore, the air-cooled condenser has a first air heat exchange channel, in which an outdoor fan and an outdoor heat exchanger are arranged, and the outdoor heat exchanger is connected in series to the refrigeration cycle system.

[0015] In this way, the fan drives the air flow in the first air heat exchange channel, so that the heat in the outdoor heat exchanger is transferred outward to the air in the first air heat exchange channel.

[0016] Furthermore, the air-conditioning terminal system includes a plurality of air-conditioning indoor units, and the air-conditioning indoor units are connected in parallel through refrigerant pipelines.

[0017] In this way, a multi-split system is formed, which significantly improves the energy efficiency of the multi-split system. When implemented, the air conditioner indoor unit refers to an air conditioner terminal form that uses the principle of direct expansion of refrigerant to reduce the air temperature and humidity in the second air heat exchange channel. Its types include but are not limited to: wall-mounted, ceiling-mounted, duct-mounted, cabinet-mounted, embedded, constant temperature and humidity air conditioners. However, it is an existing device, so the specific structure is not described in detail here.

[0018] As a preferred embodiment, the cooling water source is a water tank connected to the water pipes inside the house.

[0019] In this way, the residual cold of the water pipes inside the house can be used as a cold source to cool the air conditioning system of the house. At the same time, it can also heat the water tank to provide hot water inside the house.

[0020] As another preference, the cooling water source is a heat exchange medium container of an LNG gasification device.

[0021] The LNG gasification device is a conventional existing device (the specific structure is not described in detail here). The heat exchange medium (usually water or ethylene glycol solution or calcium chloride solution or sodium chloride solution) used in the device to realize LNG gasification heat exchange is stored in the heat exchange medium container after absorbing cold energy, and can be used as the cooling water source of the air conditioning system. In this way, the cold energy obtained in the LNG gasification process can be fully utilized to supply cooling to the house air conditioning system, achieving the effect of energy saving and consumption saving, making the air conditioning system particularly suitable for implementation in LNG gasification stations and nearby buildings.

[0022] Furthermore, the drive devices of the compressor and the fluorine pump are controlled by variable frequency drive.

[0023] In this way, compared with the fixed frequency drive method, the control effect can be better improved.

[0024] In another implementation, the expansion valve may be a thermal expansion valve, an electronic expansion valve, or a capillary expansion valve.

[0025] Therefore, the air conditioning system provided by the present invention has the following significant technical advantages compared with the prior art:

[0026] (1) Compared with the traditional VRF system, this system has added a fluorine pump and a fluorine-water plate heat exchanger (the first heat exchange unit). It can utilize the residual cold in the low-temperature cold water to achieve free cooling of the VRF system without starting the compressor, significantly improving the energy efficiency of the VRF system.

[0027] (2) The system uses a fluorine pump and a fluorine-water plate heat exchanger (the first heat exchange unit) in parallel with an air-cooled compression condensing unit (the second heat exchange unit). When the residual coolness in the low-temperature fluid cannot meet the cooling demand, the air-cooled compression condensing unit can be used to provide cooling, thereby improving the system security rate.

[0028] (3) The system is provided with a valve between the air-conditioning terminal system and the first heat exchange unit and the second heat exchange unit. By adjusting the conduction, closing and opening of the valve, the system can be operated under different working conditions to realize the first heat exchange unit and the second heat exchange unit to provide cooling separately or simultaneously.

[0029] In summary, the utility model has the advantages of simple structure, convenient implementation, can utilize the residual cold in other low-temperature fluids as a cold source to achieve cooling, can save energy loss, and improve system energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The arrow in the figure indicates the flow direction of the fluid.

[0031] Figure 2 It is a schematic diagram of the water-side residual cooling working mode of the present invention.

[0032] Figure 3 This is a schematic diagram of the cooling operation mode of the compressor of the present invention.

[0033] Figure 4 Schematic diagram of the common cooling working mode of the present invention. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below in conjunction with specific implementation methods.

[0035] When implementing: Figure 1 As shown, a house air conditioning system using water-side residual cooling includes a first heat exchange unit 200 and an air conditioning terminal system 300 that are connected to each other to form a cycle, wherein the first heat exchange unit 200 is provided with a compressor 201, an air-cooled condenser 202 and an expansion valve 203, and the compressor 201, the air-cooled condenser 202 and the expansion valve 203 are connected in series through a refrigerant pipeline to form a first refrigeration cycle branch, and a refrigerant is arranged in the first refrigeration cycle branch. The refrigerant is driven by the compressor 201 to flow through the compressor, the air-cooled condenser and the expansion valve in sequence, and exchanges heat in the first air heat exchange channel 205 of the air-cooled condenser;

[0036] The air conditioning terminal system 300 includes at least one air conditioning indoor unit 301, which is connected to the first refrigeration cycle branch to form a cycle. The air conditioning indoor unit has a second air heat exchange channel, and an indoor fan and an indoor heat exchanger are arranged in the second air heat exchange channel. The indoor fan is used to drive the air flow in the second air heat exchange channel to transfer the heat of the air in the second air heat exchange channel to the indoor heat exchanger (the air conditioning indoor unit is a mature existing device, so it is not shown in the specific structure diagram);

[0037] It also includes a second heat exchange unit 100 arranged in parallel with the first heat exchange unit 200. The second heat exchange unit 100 is provided with a fluorine-water plate heat exchanger 101 and a fluorine pump 102. The fluorine-water plate heat exchanger 101 and the fluorine pump 102 are connected in series through a refrigerant pipeline to form a second refrigeration cycle branch. The fluorine pump is used to drive the refrigerant to flow through the fluorine-water plate heat exchanger and the fluorine pump in sequence, and exchange heat with the low-temperature fluid passing in parallel in the fluorine-water plate heat exchanger; the fluorine-water plate heat exchanger is also externally provided with a cold water inlet 401 and a cold water outlet 402 for the low-temperature fluid to flow in and out. The cold water inlet 401 and the cold water outlet 402 are externally connected with water pipes connected to a cooling water source (not shown in the figure) to form a cold water circulation pipeline.

[0038] Thus, in the present invention, a parallel heat exchange unit utilizing the residual cooling of the water side is added to the conventional house air conditioning structure that relies on the compressor heat pump for cooling. When necessary (when the temperature of the low-temperature fluid at the cold water inlet is lower than the air temperature in the first air heat exchange channel), the residual cooling in other low-temperature fluids can be used as a cold source to realize cooling of the house air conditioning system, thereby achieving the effect of saving energy loss and improving the energy efficiency of the system. During implementation, the types of low-temperature fluids entering and exiting the system through the cold water inlet and the cold water outlet include but are not limited to: water, ethylene glycol solution, calcium chloride solution, and sodium chloride solution.

[0039] The first refrigeration cycle branch and the second refrigeration cycle branch are each provided with a control valve near the parallel position. The four control valves are the first control valve 207, the second control valve 208, the third control valve 103 and the fourth control valve 104.

[0040] In this way, it is convenient to control the opening and closing of the refrigerant pipeline between the air-conditioning terminal system and the first heat exchange unit and the second heat exchange unit through the control valve to achieve control switching. As another possible implementation method, a three-way control valve can be set at each of the two parallel positions to achieve control.

[0041] The second heat exchange unit 100 further includes a temperature sensor 403 , which is placed between the cold water inlet 401 and the fluorine-water plate heat exchanger 101 .

[0042] This makes it easy to detect the temperature of the low-temperature fluid at the cold water inlet to control the opening and closing of the valve.

[0043] The air-cooled condenser 202 has a first air heat exchange channel 205, in which an outdoor fan 204 and an outdoor heat exchanger 206 are arranged, and the outdoor heat exchanger 206 is connected in series to the refrigeration cycle system.

[0044] In this way, the fan drives the air flow in the first air heat exchange channel, so that the heat in the outdoor heat exchanger is transferred outward to the air in the first air heat exchange channel.

[0045] The air-conditioning terminal system 300 includes a plurality of air-conditioning indoor units 301 , and the air-conditioning indoor units are connected in parallel via refrigerant pipelines.

[0046] In this way, a multi-split system is formed, which significantly improves the energy efficiency of the multi-split system. When implemented, the air conditioner indoor unit refers to an air conditioner terminal form that uses the principle of direct expansion of refrigerant to reduce the air temperature and humidity in the second air heat exchange channel. Its types include but are not limited to: wall-mounted, ceiling-mounted, duct-mounted, cabinet-mounted, embedded, constant temperature and humidity air conditioners. However, it is an existing device, so the specific structure is not described in detail here.

[0047] As an implementable embodiment, the cooling water source is a water tank connected to the water pipes inside the house.

[0048] In this way, the residual cold of the water pipes inside the house can be used as a cold source to cool the air conditioning system of the house. At the same time, it can also heat the water tank to provide hot water inside the house.

[0049] As another possible implementation mode, the cooling water source is a heat exchange medium container of the LNG gasification device.

[0050] The LNG gasification device is a conventional existing device (the specific structure is not described in detail here). The heat exchange medium (usually water or ethylene glycol solution or calcium chloride solution or sodium chloride solution) used in the device to realize LNG gasification heat exchange is stored in the heat exchange medium container after absorbing cold energy, and can be used as the cooling water source of the air conditioning system. In this way, the cold energy obtained in the LNG gasification process can be fully utilized to supply cooling to the house air conditioning system, achieving the effect of energy saving and consumption saving, making the air conditioning system particularly suitable for implementation in LNG gasification stations and nearby buildings.

[0051] The compressor 201 and the fluorine pump 102 are driven by variable frequency drive control.

[0052] In this way, compared with the fixed frequency drive method, the control effect can be better improved.

[0053] In another implementation, the expansion valve may be a thermal expansion valve, an electronic expansion valve, or a capillary expansion valve.

[0054] The above-mentioned house air conditioning system can be operated in multiple working modes to improve the energy efficiency of the system operation. Figure 2 -Attached Figure 4 Explanation of various working modes:

[0055] Water side residual cooling working mode

[0056] As attached Figure 2As shown, when the temperature of the temperature sensor 403 is lower than the set temperature and the residual cooling on the water side can meet the cooling demand of the air-conditioning terminal system 300, the third control valve 103 and the fourth control valve 104 are opened, the fluorine pump 102 is turned on, some or all of the air-conditioning indoor units 301 in the air-conditioning terminal system 300 are turned on, and the first control valve 207 and the second control valve 208 are closed.

[0057] In this working mode, the gaseous refrigerant flowing out of the air-conditioning terminal system 300 enters the second heat exchange unit 100, and releases heat to the low-temperature fluid in the fluorine-water plate heat exchanger 101. At this time, the gaseous refrigerant condenses and liquefies into liquid refrigerant, and the liquid refrigerant is driven by the fluorine pump 102 to flow back to the air-conditioning terminal system 300. The indoor heat exchanger (not shown in the figure) in the air-conditioning indoor unit 301 absorbs the heat of the air in the second air heat exchange channel (not shown in the figure) and enters the next cycle.

[0058] Compressor cooling mode

[0059] As attached Figure 3 As shown, when the temperature of the temperature sensor 403 is higher than the set temperature, the first control valve 207 and the second control valve 208 are opened, the compressor 201 and the outdoor fan 204 are turned on, some or all of the air-conditioning indoor units 301 in the air-conditioning terminal system 300 are turned on, and the third control valve 103 and the fourth control valve 104 are closed.

[0060] In this working mode, the gaseous refrigerant flowing out of the air conditioning terminal system 300 enters the first heat exchange unit 200, and after being pressurized and heated in the compressor 201 and driving the refrigerant to flow, the outdoor heat exchanger 206 transfers heat to the air in the first air heat exchange channel 205, and the gaseous refrigerant condenses and liquefies into liquid refrigerant. The liquid refrigerant is decompressed by the expansion valve 203 and flows back to the air conditioning terminal system 300, and the indoor heat exchanger (not shown in the figure) in the air conditioning indoor unit 301 absorbs the heat of the air in the second air heat exchange channel (not shown in the figure) and enters the next cycle.

[0061] Common cooling mode

[0062] As attached Figure 4 As shown, when the temperature of the temperature sensor 403 is lower than the set temperature, but the residual cooling on the water side cannot meet the cooling demand of the air-conditioning terminal system 300, the third control valve 103, the fourth control valve 104, the first control valve 207, and the second control valve 208 are opened, the fluorine pump 102, the compressor 201, and the outdoor fan 204 are opened, and some or all of the air-conditioning indoor units 301 in the air-conditioning terminal system 300 are opened.

[0063] In this working mode, the gaseous refrigerant flowing out of the air conditioning terminal system 300 enters the second heat exchange unit 100 and the first heat exchange unit 200 respectively. In the second heat exchange unit 100, the gaseous refrigerant releases heat to the low-temperature fluid in the fluorine-water plate heat exchanger 101. At this time, the gaseous refrigerant condenses and liquefies into liquid refrigerant, and the liquid refrigerant is driven to flow by the fluorine pump 102. In the first heat exchange unit 200, after the gaseous refrigerant is pressurized and heated in the compressor 201 and the refrigerant is driven to flow, the outdoor heat exchanger 206 transfers heat to the air in the first air heat exchange channel 205. At this time, the gaseous refrigerant condenses and liquefies into liquid refrigerant, and the liquid refrigerant is decompressed through the expansion valve 203. The liquid refrigerants from the second heat exchange unit 100 and the first heat exchange unit 200 are mixed and flow to the air-conditioning terminal system 300. The indoor heat exchanger (not shown in the figure) in the air-conditioning indoor unit 301 absorbs the heat of the air in the second air heat exchange channel (not shown in the figure) and enters the next cycle.

Claims

1. A house air conditioning system using water-side residual cooling, comprising a first heat exchange unit and an air conditioning terminal system connected to each other to form a cycle, wherein the first heat exchange unit is provided with a compressor, an air-cooled condenser and an expansion valve, and the compressor, the air-cooled condenser and the expansion valve are connected in series through a refrigerant pipeline to form a first refrigeration cycle branch, and a refrigerant is arranged in the first refrigeration cycle branch. The refrigerant is driven by the compressor to flow through the compressor, the air-cooled condenser and the expansion valve in sequence, and exchanges heat in a first air heat exchange channel of the air-cooled condenser; The air conditioning terminal system includes at least one air conditioning indoor unit, the air conditioning indoor unit and the first refrigeration cycle branch are connected to form a cycle, the air conditioning indoor unit has a second air heat exchange channel, the second air heat exchange channel is provided with an indoor fan and an indoor heat exchanger, the indoor fan is used to drive the air flow in the second air heat exchange channel, so as to transfer the heat of the air in the second air heat exchange channel to the indoor heat exchanger; It is characterized in that It also includes a second heat exchange unit arranged in parallel with the first heat exchange unit, the second heat exchange unit is provided with a fluorine-water plate heat exchanger and a fluorine pump, the fluorine-water plate heat exchanger and the fluorine pump are connected in series through a refrigerant pipeline to form a second refrigeration cycle branch, the fluorine pump is used to drive the refrigerant to flow through the fluorine-water plate heat exchanger and the fluorine pump in sequence, and exchange heat with the low-temperature fluid passing in parallel in the fluorine-water plate heat exchanger; the fluorine-water plate heat exchanger is also externally provided with a cold water inlet and a cold water outlet for the low-temperature fluid to flow in and out, and the cold water inlet and the cold water outlet are externally connected with water pipes connected to a cooling water source to form a cold water circulation pipeline.

2. The room air conditioning system using water side residual cooling as claimed in claim 1, characterized in that: The first refrigeration cycle branch and the second refrigeration cycle branch are each provided with a control valve near the parallel position.

3. The room air conditioning system using water side residual cooling as claimed in claim 2, characterized in that: The second heat exchange unit also includes a temperature sensor, which is placed between the cold water inlet and the fluorine-water plate heat exchanger.

4. The house air conditioning system using water side residual cooling as claimed in claim 1, characterized in that: The air-cooled condenser has a first air heat exchange channel, in which an outdoor fan and an outdoor heat exchanger are arranged, and the outdoor heat exchanger is connected in series to the refrigeration cycle system.

5. The house air conditioning system using water-side residual cooling as claimed in claim 1, characterized in that: The air-conditioning terminal system includes a plurality of air-conditioning indoor units, and the air-conditioning indoor units are connected in parallel through refrigerant pipelines.

6. The room air conditioning system using water side residual cooling as claimed in claim 1, characterized in that: The cooling water source is a water storage tank connected to the water pipe inside the house.

7. The room air conditioning system using water side residual cooling as claimed in claim 1, characterized in that: The cooling water source is a heat exchange medium container of the LNG gasification device.

8. The room air conditioning system using water side residual cooling as claimed in claim 1, characterized in that: The compressor and the fluorine pump are driven by variable frequency drive control.

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