CN212805887U - Indirect evaporation air conditioning unit capable of realizing total heat and partial heat recovery - Google Patents

Abstract

The utility model belongs to data center design field relates to an indirect evaporation heating cooling unit that can total heat and part retrieve, include: a condenser, a compressor, a heat recovery heat exchanger (8) and an expansion valve (11); a sealing valve; a hot water circulation pump (14); the air-air indirect evaporation heat exchanger comprises a surface cooler (19), a gas-liquid separator (10) and an air-air indirect evaporation heat exchanger (5); the air conditioning unit is characterized in that the compressor, the heat recovery heat exchanger (8), the condenser, the liquid storage tank (9), the expansion valve (11), the surface cooler (19) and the gas-liquid separator (10) are sequentially connected, the air-air indirect evaporation heat exchanger (5) and a matched spraying device are further arranged inside the air conditioning unit along the air return direction, and the gas-liquid separator (10) is connected with the compressor (7). The utility model discloses but the wide application realizes air conditioning system quick installation, debugging in big-and-middle-sized data center project, reduces air conditioning system's engineering volume, because the equipment room is arranged still can make the computer lab in no water suffer from the risk.

Description

Indirect evaporation air conditioning unit capable of realizing total heat and partial heat recovery

Technical Field

The utility model belongs to data center design field, concretely relates to novel can realize indirect evaporation air conditioning unit of total heat and partial heat recovery.

Background

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.

With the increasing construction scale of data centers, the energy consumption is higher, and the data center IT equipment converts electric energy into heat energy which is dissipated to the environment by an air conditioning system and is not fully utilized, especially when an indirect evaporation air conditioning unit is used.

With the national development of the evaluation standard of the green data center, the evaluation standard has a definite limit value requirement on the PUE of the data center, so that data center designers and users are required to pay attention to the energy utilization of the data center. When data centers constructed in hot summer, cold winter, cold and severe cold regions are in winter and transition seasons, an air conditioner heating system and a domestic hot water heating system are required to be designed, most of the existing data center heating adopts municipal heat sources for heating, and waste heat of the data center is not recovered.

In recent years, some data center projects air conditioner cooling systems often use indirect evaporation air conditioner cooling units, and the existing indirect evaporation cooling units can only supply cold and cannot realize recovery of waste heat of IT equipment of a data center.

For example: the existing indirect evaporation air conditioner cooling unit only has a cooling function and does not have a heating function, the waste heat of IT equipment of a data center is completely discharged into the environment through an outdoor fan of the air conditioner unit during operation, energy waste is caused, the data center winter air conditioner system in hot summer, cold winter, severe cold and cold regions needs to supply heat, and domestic hot water running all year round needs to supply heat, so that energy consumption and waste are caused again. The existing auxiliary DX air-conditioning condenser of the indirect evaporation cooling unit adopts an air-cooled condenser, and the condensing temperature is higher, so that the power consumption of a compressor is high.

As shown in fig. 1: the existing indirect evaporation cooling unit can only supply cold but cannot supply heat, high-temperature exhaust of a compressor is cooled by outdoor air in an air-cooled condenser, heat is dissipated to the outdoor environment, waste of heat energy is caused, energy conservation of an air conditioning system of the data center is not facilitated, heat for hot water in the whole year of life of the data center and heat for air conditioning in transitional seasons in winter need to be supplied by municipal heat sources, and therefore the operation cost of the data center is increased.

Disclosure of Invention

In order to overcome the problem, the utility model relates to an indirect evaporation heat supply cooling unit that ability total heat and part were retrieved, heat recovery heat exchanger, partial refrigeration pipeline and hot water supply return water pipeline and the hot circulating water pump through increasing switching valves, refrigerant and water in indirect evaporation cooling unit realize incessant providing required hot water for data center all the year, improve the utilization ratio of data center waste heat. The utility model discloses but the wide application realizes air conditioning system quick installation, debugging in big-and-middle-sized data center project, reduces air conditioning system's engineering volume, because the equipment room is arranged still can make the computer lab in no water suffer from the risk.

In order to achieve the technical purpose, the utility model discloses a following utility model:

the utility model discloses a first aspect provides a can realize total heat and indirect evaporation air conditioning unit of partial heat recovery, include: a condenser, a compressor, a heat recovery heat exchanger 8, an expansion valve 11; a sealing valve; a hot water circulation pump 14; a surface cooler 19, a gas-liquid separator 10 and a heat exchanger 5; the air conditioning unit is characterized in that the compressor, the heat recovery heat exchanger 8, the condenser, the liquid storage tank 9, the expansion valve 11, the surface cooler 19 and the gas-liquid separator 10 are sequentially connected, the heat exchanger 5 and a matched spraying device are further arranged in the air conditioning unit along the air return direction, and the gas-liquid separator 10 is connected with the compressor 7; the heat recovery heat exchanger 8 may be provided before or after the heat recovery heat exchanger, or may not be provided with a sealing valve.

The utility model discloses can be for data center supply idle call hot water and life hot water, through the compressor data center waste heat recovery to air conditioner hot-water heating system and life hot-water heating system, still adopted the indirect evaporative condenser of coil pipe formula to reduce the consumption and the distribution investment of compressor, and the supplementary DX cooling equipment condenser of above-mentioned patent and equipment adopts the air-cooled condenser, has also adopted the heat pipe to retrieve in the computer lab waste heat of airing exhaust to the computer lab new trend in the heat recovery form. The evaporative cooling air conditioning unit adopts a heat pipe heat recovery machine room to recover exhaust waste heat into fresh air, and belongs to a full-exhaust full-fresh-air evaporative cooling air conditioning unit.

The beneficial effects of the utility model reside in that:

(1) the utility model discloses set up heat recovery heat exchanger and can all or part recovery computer lab waste heat for data center garden auxiliary building and office air conditioning system heat supply winter in indirect evaporation air conditioner cooling unit all the year, still can be continuous for garden life hot water heat supply all the year around, data center winter heat supply expense has been reduced, reduce data center all the year carbon emission, realize energy saving and emission reduction, this patent heat recovery system and equipment not only can make in advance at the mill, the complete machine is delivered together in random group, can also reform transform current indirect evaporation air conditioner cooling unit according to patent scheme.

The coil type indirect evaporative condenser replaces the design of an air-cooled condenser of an auxiliary direct expansion DX air conditioner of a traditional indirect evaporation air conditioning unit, the coil type indirect evaporative condenser is adopted to obviously reduce the condensation temperature of the auxiliary direct expansion DX air conditioner, improve the COP of the auxiliary direct expansion compressor, reduce the rated power and the operation power consumption of the compressor, reduce the air volume and the operation power consumption of a condenser exhaust fan and reduce the initial investment of a fan, thereby reducing the initial investment of the whole equipment of the IDEC indirect evaporation unit and the initial investment of the power distribution of an electric system, and the usability is extremely high.

(2) The utility model discloses a method is simple, with low costs, the practicality is strong, easily promotes.

Drawings

The accompanying drawings, which form a part of the specification, 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 invention without unduly limiting the scope of the invention.

FIG. 1 is a schematic diagram of an indirect evaporative cooling unit in the prior art; wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 5 assisting an air-cooled condenser of DX cooling equipment; 6, surface cooling; 7 direct expansion (DX) refrigeration equipment compressor; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 15 a water collecting tank; 16 a coarse filter; 17 air return inlet; 18 air supply outlet;

FIG. 2 is a schematic diagram I of a cooling and heating system of an indirect evaporation air conditioning equipment with full heat and partial heat recovery 2-1; 2-2 schematic diagram of a cooling and heating system of the indirect evaporation air conditioning equipment with full heat and partial heat recovery;

wherein, 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 4, a coil pipe type indirect evaporative condenser spray water pump; 5, an air-to-air indirect evaporation heat exchanger; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 12 a first electrically operated airtight valve; 13 a second electrically operated airtight valve; 14 hot water circulating pump; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlets;

FIG. 3, wherein, 3-1 is a schematic diagram of a cooling and heating system of an indirect evaporation air conditioning equipment with total heat and partial heat recovery; 3-2, a schematic diagram of a cooling and heating system of the total heat and partial heat recovery indirect evaporation air conditioning equipment is four;

wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 4, a coil pipe type indirect evaporative condenser spray water pump; 5, an air-to-air indirect evaporation heat exchanger; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 15 electric three-way valve; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlets.

FIG. 4 is a schematic diagram of a cooling and heating system of the indirect evaporation air conditioning equipment with full heat recovery and partial heat recovery;

wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 4, a coil pipe type indirect evaporative condenser spray water pump; 5, an air-to-air indirect evaporation heat exchanger; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 12 a first electrically operated airtight valve; 13 a second electrically operated airtight valve; 14 hot water circulating pump; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlet

FIG. 5 is a schematic diagram of a cooling and heating system of the indirect evaporation air conditioning equipment with full heat recovery and partial heat recovery;

wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 4, a coil pipe type indirect evaporative condenser spray water pump; 5, an air-to-air indirect evaporation heat exchanger; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 15 electric three-way valve; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlet

FIG. 6 is a seventh schematic diagram of a cooling and heating system of the total heat and partial heat recovery indirect evaporation air conditioning equipment;

wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 4, a coil pipe type indirect evaporative condenser spray water pump; 5, an air-to-air indirect evaporation heat exchanger; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlet

FIG. 7 is a schematic view of an eighth embodiment of a cooling and heating system of an indirect evaporative air conditioning apparatus with total heat and partial heat recovery;

wherein: 1 indoor side blower; 2 outdoor side exhaust fan; 3, an air-to-air indirect evaporation heat exchanger spray water pump; 5, an air-to-air indirect evaporation heat exchanger; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 15 electric three-way valve; 16 a water collecting tank; 17 a coarse filter; 18 air return openings; 19 surface cooler; 20 air supply outlets; 22 air-cooled condenser

FIG. 8 is a schematic diagram I of a multi-stage compression heating and cooling system of an 8-1 total heat and partial heat recovery indirect evaporation air conditioning unit;

8-2 total heat and partial heat recovery indirect evaporation air conditioning equipment multi-stage compression heat and cold supply system schematic diagram II;

wherein: 2 outdoor side exhaust fan; 4, a coil pipe type indirect evaporative condenser spray water pump; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 16 a water collecting tank; 19 an internal surface cooler of the indirect evaporator set; a 21 direct expansion (DX) refrigeration high pressure stage compressor;

FIG. 9, wherein, 9-1 the total heat and partial heat recovery indirect evaporation air conditioning equipment multi-stage compression heating and cooling system schematic diagram III;

9-2, a four schematic diagram of a multi-stage compression heat and cold supply system of the total heat and partial heat recovery indirect evaporation air conditioning equipment;

wherein: 2 outdoor side exhaust fan; 4, a coil pipe type indirect evaporative condenser spray water pump; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 16 a water collecting tank; 19 an internal surface cooler of the indirect evaporator set; a 21 direct expansion (DX) refrigeration high pressure stage compressor;

FIG. 10 is a schematic diagram of a multi-stage compression heating and cooling system of the total heat and partial heat recovery indirect evaporation air conditioning equipment;

wherein: 2 outdoor side exhaust fan; 4, a coil pipe type indirect evaporative condenser spray water pump; 6, a coil type indirect evaporative condenser; a direct expansion (DX) refrigerant compressor; 8, a heat recovery heat exchanger; 9 a liquid storage tank; 10, gas-liquid separation; 11 an electronic expansion valve; 14 hot water circulating pump; 16 a water collecting tank; 19 an internal surface cooler of the indirect evaporator set; a 21 direct expansion (DX) refrigeration high pressure stage compressor.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The utility model discloses mainly there are two optimization to current indirect evaporator unit:

firstly, a refrigerant and water heat exchanger, a quick switching valve during refrigeration and heating operation and a pipeline from the refrigerant to the heat exchanger are additionally arranged in the unit, condensation heat in the refrigerant can be recovered to hot water by the refrigerant and the water heat exchanger, the high-temperature and high-pressure refrigerant coming out of a compressor passes through the heat recovery heat exchanger firstly, the refrigerant is cooled into a liquid state, hot water return water on the secondary side of the heat exchanger is heated and heated (the temperature of the hot water can be adjusted according to requirements), and then is supplied to a data center air conditioning system in winter and a domestic hot water heating system by a hot water circulating pump, liquid refrigeration enters a coil type indirect evaporative condenser for recooling (recooling can increase the refrigerating capacity and improve the refrigerating efficiency), and finally enters an evaporator to cool the unit after expansion of an expansion valve, so. And the refrigerant and the water heat recovery heat exchanger are arranged to carry out total heat and partial heat recovery on the condensation heat of the compressor, so that the simultaneous operation of cooling and heating can be realized, the heating cost of the data center in winter and the heating cost of hot water in whole year life are reduced, and the carbon emission of the data center in whole year is also reduced.

And secondly, the air-cooled condenser matched with original auxiliary direct expansion (DX) refrigeration equipment in the unit is replaced by a coil type indirect evaporative condenser, a circulating spray water pump for independently spraying the coil is additionally arranged, the spray pipe is arranged right above the coil, the coil type indirect evaporative condenser can be arranged below or above the air-to-air indirect evaporative heat exchanger, and the coil type indirect evaporative condenser and the air-to-air indirect evaporative heat exchanger share an exhaust fan and a water collecting tank.

After the air-cooled condenser is changed into a coil indirect evaporative cooler, the evaporation temperature is lower by about 8 ℃ plus the wet bulb temperature of outdoor air, and is about 10 ℃ lower than the condenser temperature (the condensation temperature of the air-cooled cooler is generally 15 ℃ plus the outdoor dry bulb temperature) of the existing air-cooled condenser; the refrigerating efficiency of the compressor is improved by about 3% when the condensing temperature is reduced by 1 ℃, so that the input power of the compressor is reduced by about 25% -30% after the coil type indirect evaporative condenser is adopted. Therefore, the initial investment and the power distribution cost of the compressor are reduced, and the running power consumption of the compressor is reduced (taking Beijing as an example, the outdoor dry bulb temperature is calculated according to 35 ℃, the outdoor extreme wet bulb temperature is 30 ℃, if an auxiliary direct expansion (DX) refrigeration device adopts an indirect evaporative cooler, the difference between the refrigerant condenser temperature and the condensing temperature when an air-cooled condenser is adopted is about (35+15) - (30+ 8): 12 ℃, the refrigerating efficiency of the compressor is improved, and the input power of the compressor is reduced by about 12 (2% -3%): 24% -36%).

When the coil type spray water evaporation condenser is adopted by the auxiliary direct expansion (DX) refrigeration equipment, the power distribution power of the compressor can be effectively reduced, the refrigeration efficiency of the compressor is improved, and the air volume of the cooling exhaust fan can be reduced, so that the type of the exhaust fan is reduced, the operation energy consumption of the exhaust fan is reduced, and the operation PUE and the operation cost of the system are reduced. And thus the usability is extremely high.

In some embodiments, the compressors are provided in multiple, parallel or series configurations;

in some embodiments, the compressor is a centrifugal compressor, a piston compressor, a scroll compressor or a screw compressor, a vane compressor, a rolling rotor compressor;

in some embodiments, the heat recovery heat exchanger is a shell and tube heat exchanger, a node tube heat exchanger or a plate heat exchanger, a thread disturbance coil heat exchanger, a spiral thread tube heat exchanger, a double tube heat exchanger;

in some embodiments, the sealing valve is an electrically sealed valve, or a pneumatically sealed valve;

in some embodiments, the air-cooled condenser is a coil-in-coil fin type;

in some embodiments, the heat exchanger (5) is an air-to-air indirect evaporative heat exchanger;

in some embodiments, the compressor is a direct expansion refrigerant compressor.

The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.

Example 1:

as shown in fig. 2, 2-1, the containment valve comprises: the first electric sealing valve (12) and the second electric sealing valve (13) are arranged in parallel or in series; when the indirect evaporation air conditioning unit needs large cooling capacity and needs total heat recovery operation or partial heat recovery operation, the second electric closed valve 13 is opened, the first electric closed valve 12 is closed, the refrigerant is compressed by the compressor 7 and then enters the heat recovery heat exchanger 8, exchanges heat with cold water in the heat recovery heat exchanger 8 and then enters the coil type indirect evaporation condenser 6 for re-cooling, and then enters the evaporator 19 in the unit for exchanging heat with the air supply unit of the indirect evaporation air conditioning unit through the throttling of the electronic expansion valve 11, so that the temperature of the supplied air is reduced, the refrigerant in the evaporator 19 is completely vaporized and then passes through the gas-liquid separator, enters the compressor 7 and is compressed into high-temperature and high-pressure gas, and therefore the next cycle of cooling and total heat or partial heat recovery is performed. Cold water enters the heat recovery heat exchanger 8 and is heated by high-temperature and high-pressure refrigerant steam, and then is supplied to systems needing heat sources, such as an air conditioner heating system, a domestic hot water heating system and the like by a hot water circulating pump.

When the unit needs to supply small cooling capacity and large heat, when the unit is in full heat recovery operation and partial heat recovery operation, the first electric sealing valve 12 is opened, the second electric sealing valve 13 is closed, the refrigerant is compressed by the compressor 7 and then enters the heat recovery heat exchanger 8, exchanges heat with cold water in the heat recovery heat exchanger, throttled by the electronic expansion valve 11 and enters the evaporator 19 for supplying air and cooling in the indirect evaporation air conditioning unit, waste heat recovery and cooling circulation of the indirect evaporation unit is realized, the refrigerant in the evaporator 19 absorbs heat and is completely vaporized, then enters the compressor 7 through the gas-liquid separator, and is compressed into high-temperature and high-pressure gas, so that the next cooling and full heat or partial heat recovery circulation is performed.

Example 2

As shown in fig. 2-2, is another system form using a first electro-pneumatic sealing valve 12 and a second electro-pneumatic sealing valve 13, the difference being that the two electro-pneumatic valves in fig. 2-2 are before the heat recovery heat exchanger, and the two electro-pneumatic valves in fig. 2-1 are after the heat recovery heat exchanger.

When the indirect evaporation air conditioning unit operates in cold supply and total heat or partial heat recovery, the spray water pump 3 matched with the air-air indirect evaporation heat exchanger 5 and the spray water pump 4 matched with the coil type indirect evaporation condenser are both required to be started.

Example 3

As shown in fig. 3-1 and 3-2, an electric three-way valve 15 is used instead of the first electric closing valve 12 and the second electric closing valve 13, and comprises: the three-way valve (15) is used for completing the waste heat recovery and cooling circulation of the indirect evaporation unit, the electric three-way valve 15 can realize the functions of the first electric closed valves 12 and 13, and the scheme 3-1 and the scheme 3-2 in the figure 3 are different in the installation position of the electric three-way valve 15.

Example 4

Referring to fig. 4, 5 and 6, a schematic diagram of a total heat and partial heat recovery refrigeration system with a coil type indirect evaporative condenser 6 of an auxiliary direct expansion (DX) refrigeration system arranged at the lower part of the unit is shown, and 2-1, 2-2 in fig. 2 and 3-1, 3-2 in fig. 3 are schematic diagrams with a coil type indirect evaporative condenser arranged at the upper part of the unit.

Example 5

The coil indirect evaporative condenser 6 of the fig. 6 solution can also be arranged in the upper part of the unit.

As shown in fig. 6, which is a schematic diagram of the total heat and partial heat recovery refrigeration system without the electric three-way valve 15, the first electric sealing valve 12 and the second electric sealing valve 13, when the unit is operated, the high-temperature high-pressure gas from the compressor 7 firstly passes through the heat recovery heat exchanger 8 to heat cold water, then the cooled refrigerant enters a coil type indirect evaporative condenser 6 arranged at the lower part of the unit for recooling (the coil type indirect evaporative condenser 6 can also be arranged at the upper part of the unit), the cooled refrigerant enters an evaporator 9 after being expanded by an expansion valve 11 or a capillary tube (electronic expansion or thermal expansion valve), then the cooled refrigerant supplies air for cooling and cooling the indirect evaporative unit, the refrigerant in a tube 19 of the evaporator absorbs heat and is completely vaporized, then the refrigerant enters a compressor 7 through a gas-liquid separator, and the refrigerant is compressed into high-temperature and high-pressure gas, so that the next cooling and full-heat or partial heat recovery circulation is performed.

Example 6

The system principle and the operation method shown in fig. 7 are the same as those of fig. 5 and 3-1 and 3-2 in fig. 3, except that the heat recovery heat exchanger is arranged at the top of the unit, and the existing indirect evaporation air conditioning unit without the functions of total heat recovery and partial heat recovery can be changed into the indirect evaporation air conditioning unit with the functions of total heat recovery and partial heat recovery according to the scheme shown in fig. 7 and the schemes above under the condition that the air-cooled condenser is not changed.

Example 7

When the hot water outlet temperature is higher or the power of the compressor designed by the original indirect evaporation air conditioner cooling unit is lower, the schemes of 8-1 and 8-2 in the figure 8, 9-1 and 9-2 in the figure 9 and the schematic diagram of the figure 10 can be adopted, when the outlet water temperature is higher, two-stage or multi-stage series (2-stage or more) compressors can be adopted to pressurize and heat the refrigerant (the refrigerant can be the refrigerant used in the existing air conditioning system), when the heat supply is higher, a plurality of (1-5 or more) compressors can be adopted to be connected in parallel to increase the refrigerant flow to improve the heat supply in winter, and the cold supply capacity can be improved.

The schemes 8-1 and 8-2 in figure 8 are the same as the schemes 3-1, 3-2 and 5 in figure 3, the electric three-way valves are adopted, the difference is that the compressors are designed with multi-stage series connection and multi-stage parallel connection,

example 8

The schemes 9-1 and 9-2 in figure 9 are the same as the schemes 2-1, 2-2 and 4 in figure 2, the electric two-way valves are adopted, the difference is that the compressors are designed with multi-stage series connection and multi-stage parallel connection,

example 9

The scheme in figure 10 and the scheme in figure 6 have the same point that no electric three-way valve and no electric two-way valve exist in the system, and the difference is that the compressors are designed into multi-stage series connection and multi-stage parallel connection.

The compressor can adopt a centrifugal compressor, a piston compressor, a scroll compressor and a screw compressor in all the schemes, and the heat recovery heat exchanger can be: the shell-and-tube heat exchanger or the corrugated tube heat exchanger, the plate heat exchanger and other common cold and hot water heat exchangers, the heat exchanger, the compressor, the hot water circulating pump and the like can be arranged in the internal space of the unit (matched with the unit) or arranged in the external space of the unit nearby, and can be arranged up and down and around, and can be arranged on site when arranged outside, and the electric two-way valve and the electric three-way valve can also adopt a pneumatic two-way valve or a pneumatic three-way valve.

The condenser matched with the auxiliary DX direct-expansion refrigeration compressor of the total heat and partial heat recovery indirect evaporation air conditioning unit can be a coil type indirect evaporation condenser 6, and can also be an air-cooled condenser 22, when the air-cooled condenser is adopted, because of dry cooling, a spray water pump 4 is not required to be configured, and the air-cooled condenser is generally arranged above the air-air indirect evaporation heat exchanger or below the air-air indirect evaporation heat exchanger along the air flow direction (namely cold air firstly passes through the air-air indirect evaporation heat exchanger and then passes through the air-cooled condenser).

The coil type indirect evaporative condenser 6 for assisting mechanical refrigeration can be arranged above or below the air-air indirect evaporative heat exchanger, a spray pipeline and a spray water pump can be designed for the coil type indirect evaporative condenser independently, and the coil type indirect evaporative condenser and the unit air-air indirect evaporative heat exchanger can share the spray pipeline and the spray water pump.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the present invention may be modified by modifications of the embodiments described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the above description describes the specific embodiments of the present invention, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that, on the basis of the present invention, various modifications or variations that can be made by those skilled in the art without paying inventive labor are still within the scope of the present invention.

Claims (10)

1. An indirect evaporation air conditioning unit capable of realizing total heat recovery and partial heat recovery, which is characterized by comprising: a condenser, a compressor, a heat recovery heat exchanger (8) and an expansion valve (11); a sealing valve; a hot water circulation pump (14); the air-air indirect evaporation heat exchanger comprises a surface cooler (19), a gas-liquid separator (10) and an air-air indirect evaporation heat exchanger (5); the air conditioning unit is characterized in that the compressor, the heat recovery heat exchanger (8), the condenser, the liquid storage tank (9), the expansion valve (11), the surface cooler (19) and the gas-liquid separator (10) are sequentially connected, the air-air indirect evaporation heat exchanger (5) and a matched spraying device are further arranged inside the air conditioning unit along the air return direction, and the gas-liquid separator (10) is connected with the compressor (7).

2. Indirect evaporative air conditioning unit with total and partial heat recovery, according to claim 1, characterised in that the heat recovery heat exchanger (8) is preceded or followed by a closing valve.

3. Indirect evaporative air conditioning unit with total and partial heat recovery, according to claim 1, characterised in that the heat recovery heat exchanger (8) is not provided with a closing valve before or after it.

4. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as set forth in claim 1, wherein the condenser is an air-cooled condenser (22) or a coil indirect evaporative condenser (6).

5. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as set forth in claim 1, wherein the heat recovery heat exchanger (8) is connected with an exhaust pipe of a compressor at one end and connected with a coil type indirect evaporative condenser (6) or an air-cooled condenser (22) at the other end;

or the heat recovery heat exchanger (8) is arranged inside and outside the indirect evaporation air conditioning unit;

or the heat recovery heat exchanger (8) is arranged at the upper part or the lower part of the indirect evaporation air conditioning unit.

6. The indirect evaporative air conditioning unit capable of full and partial heat recovery as recited in claim 1 wherein said containment valve comprises: the first electric sealing valve (12) and the second electric sealing valve (13) are arranged in parallel or in series;

or the containment valve comprises: a three-way valve (15).

7. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as set forth in claim 4, wherein the coil type indirect evaporative condenser (6) is located above or below the air-to-air indirect evaporative heat exchanger (5).

8. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as recited in claim 4, wherein the coil type indirect evaporative condenser (6) is located above the air-to-air indirect evaporative heat exchanger (5), and an electric three-way valve (15) is arranged in front of the heat exchanger (8).

9. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as recited in claim 1, wherein the compressors are provided in a plurality of numbers, and are arranged in parallel or in series;

the compressor is a centrifugal compressor, a piston compressor, a scroll compressor or a screw compressor, a suspension compressor or a rolling rotor compressor;

or the heat recovery heat exchanger is a shell-and-tube heat exchanger, a corrugated tube heat exchanger or a plate heat exchanger, a thread disturbance coil heat exchanger, a spiral thread tube heat exchanger or a sleeve heat exchanger;

or the sealing valve is an electric sealing valve or a pneumatic sealing valve;

or the air-cooled condenser is a coil pipe and fins are connected in series;

or the air-to-air indirect evaporation heat exchanger (5) is an air-to-air indirect evaporation heat exchanger;

or the compressor is a direct expansion refrigeration compressor.

10. The indirect evaporative air conditioning unit capable of achieving total heat recovery and partial heat recovery as recited in claim 4, wherein the coil type indirect evaporative condenser (6) is independently provided with a spray pipe and a spray water pump;

or the coil type indirect evaporative condenser (6) and the air-to-air indirect evaporative heat exchanger (5) share one set of spray pipeline and spray pump.

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