CN209744610U - Water-saving closed cooling air conditioning system - Google Patents

Abstract

The utility model belongs to warm air handling equipment who leads to the air conditioner field, especially a water-saving closed cooling air conditioning system, including dry-type indirect evaporation refrigerating unit and mechanical refrigerating unit, dry-type indirect evaporation refrigerating unit includes direct evaporation refrigerating plant, surface type heat exchanger, exhaust fan and quick-witted case, and mechanical refrigerating unit condenser import is being connected through first circulating pump to the exit pipe of surface type heat exchanger, and the import of surface type heat exchanger is being connected to the outlet pipe of its condenser, and the import of mechanical refrigerating unit evaporimeter is being connected through second circulating pump and user to the exit pipe of mechanical refrigerating unit evaporimeter. The utility model discloses it is rational in infrastructure, can improve the operation security of system, avoid freezing and the problem of jam that open cooling water system exists, can reduce the water consumption, realize the water conservation, reduce mechanical refrigeration unit's configuration.

Description

Water-saving closed cooling air-conditioning system

technical field

The utility model belongs to air treatment equipment in the field of heating, ventilation and air conditioning, in particular to a water-saving closed cooling air conditioning system.

Background technique

In the traditional mechanical refrigeration and air-conditioning system, the cooling water system is indispensable. Usually, the open cooling tower is used to produce cold water to take away the heat. However, when the open cooling tower is in operation in winter, the cooling tower is prone to freezing, and The open cooling water system has many problems such as poor water quality and blockage of heat exchange coils. The widely used closed cooling tower solves the clogging problem caused by the open cooling water, but usually needs to open the spray water system to cool the cooling water in the closed coil by making cold water, which may cause water consumption The increase, in some areas where water resources are relatively scarce, the application is limited.

Utility model content

The purpose of the utility model is to provide a water-saving closed cooling air-conditioning system, which has a reasonable structure, can improve the safety of the system operation, can avoid the problems of freezing and blockage in the open cooling water system, can reduce water consumption, and realize Save water and reduce the configuration of mechanical refrigeration units.

The purpose of this utility model is achieved as follows: a water-saving closed cooling air-conditioning system includes a dry indirect evaporative refrigeration unit and a mechanical refrigeration unit, and the dry indirect evaporative refrigeration unit includes a direct evaporative refrigeration unit and a surface heat exchanger , exhaust fan and chassis, the outlet pipe of the surface heat exchanger is connected to the inlet of the condenser of the mechanical refrigeration unit through the first circulation pump, the outlet pipe of the condenser is connected to the inlet of the surface heat exchanger, and the evaporator of the mechanical refrigeration unit The outlet pipe is connected to the inlet of the evaporator of the mechanical refrigeration unit through the second circulation pump and the user.

The utility model uses the outdoor air to cool the cooling water of the surface heat exchanger coil, and the prepared cooling water is used for the condenser of the mechanical refrigeration unit, and the spray water system can be turned off most of the time to realize water-saving operation; In the section, when the outdoor air temperature is relatively high, the direct evaporative refrigeration device is turned on to reduce the air temperature, and the cooling water is produced through the wet cooling of the dry indirect evaporative refrigeration unit; when the cooling water in the surface heat exchanger coil When the outlet water temperature is relatively low, this part of cold water is first used for cooling by the air conditioner user, and then used as cooling water for the mechanical refrigeration unit. The mechanical refrigeration unit is used as auxiliary refrigeration to make full use of natural cooling and reduce energy consumption.

advantage:

1. The cooling water system of the mechanical refrigeration unit operates in closed mode, which improves the safety of system operation and avoids the problems of freezing and blockage in the open cooling water system;

2. Use outdoor low-temperature air for natural cooling during part of the year, reducing water consumption and saving water;

3. During part of the year, the closed cooling water is used to cool the air-conditioning users first, and then used as the cooling water of the mechanical refrigeration unit, which reduces the configuration of the mechanical refrigeration unit;

4. In order to better prevent freezing, the cooling medium in the closed cooling water system can be antifreeze, such as ethylene glycol.

The utility model has a reasonable structure, improves the safety of system operation, avoids the problems of freezing and blockage in the open cooling water system, reduces water consumption, realizes water saving, and reduces the configuration of mechanical refrigeration units.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings. Fig. 1 is a schematic structural view of the utility model embodiment 1, Fig. 2 is a structural schematic view of the utility model embodiment 2, and Fig. 3 is a structural schematic view of the utility model embodiment 3, Fig. 4 is a schematic structural view of Embodiment 4 of the present utility model, FIG. 5 is a schematic structural view of Embodiment 5 of the present utility model, and FIG. 6 is a schematic structural view of Embodiment 6 of the present utility model.

Detailed ways

A water-saving closed cooling air-conditioning system, as shown in Figure 1, includes a dry-type indirect evaporative refrigeration unit and a mechanical refrigeration unit, the dry-type indirect evaporative refrigeration unit includes a direct evaporative refrigeration device 3, a surface heat exchanger 4, an exhaust The fan 5 and the chassis, the outlet pipe of the surface heat exchanger 4 is connected to the inlet of the condenser of the first mechanical refrigeration unit 7 through the first circulating pump 6, and the outlet pipe of the condenser is connected to the inlet of the surface heat exchanger 4, the second The outlet pipe of the evaporator of a mechanical refrigeration unit 7 is connected to the inlet of the evaporator of the first mechanical refrigeration unit 7 through the second circulation pump 8 and the user 9 . A direct evaporative cooling device 3 , a surface heat exchanger 4 and an exhaust fan 5 are sequentially arranged in the cabinet with the air inlet 1 and the air outlet 2 according to the air inlet direction. The water-saving closed cooling air-conditioning system includes a dry indirect evaporative refrigeration unit and a mechanical refrigeration unit, wherein the dry indirect evaporative refrigeration unit includes a direct evaporative refrigeration unit 3, a surface heat exchanger 4 and an exhaust fan 5, and a surface heat exchanger The cooling medium in 4 is cooled by air, and after the temperature drops, it is used as the cooling water of the mechanical refrigeration unit. The cooling water realizes closed cooling, avoiding the problems of coil blockage and winter freezing in conventional open cooling water; The air inlet side of the surface heat exchanger 4 is equipped with a direct evaporative refrigeration device 3, and the air and water perform direct evaporative refrigeration heat exchange and cooling in some time periods, which reduces the temperature of the air passing through the surface heat exchanger 4, and in some time periods, it is closed The spray water system of the direct evaporative refrigeration device 4 utilizes the outdoor low-temperature air to cool the cooling medium in the surface heat exchanger 4 to realize water-saving operation.

As shown in Figure 2, users 9 are divided into high-temperature users 10 and low-temperature users 11, the outlet pipe of the surface heat exchanger 4 is connected to the condenser inlet of the first mechanical refrigeration unit 7 through the first circulation pump 6 and the high-temperature user 10, and the second The outlet pipe of the evaporator of a mechanical refrigeration unit 7 is connected to the inlet of the evaporator of the first mechanical refrigeration unit 7 through the second circulation pump 8 and the low-temperature user 11 . The outlet liquid of the surface heat exchanger 4 is used for the high-temperature user 10 of the air conditioner, and the return liquid of the high-temperature user 10 enters the condenser as the cooling water of the first mechanical refrigeration unit 7, and the outlet liquid of the condenser returns to the surface heat exchanger 4 Circulating cooling, the cold water from the evaporator side of the first mechanical refrigeration unit 7 enters the low-temperature user 11 of the air conditioner, and the first operation mode: when the dry bulb temperature of the outdoor air is low, the dry-type indirect evaporative refrigeration unit performs dry cooling, and the liquid is used For high-temperature user 10 cooling, the spray water system of the direct evaporative refrigeration device 3 and the first mechanical refrigeration unit 7 are turned off at this time, and the second operation mode: the spray water system of the direct evaporative refrigeration device 3 is turned on, and the dry indirect evaporative refrigeration unit performs Wet cooling, the outlet liquid is used for cooling by the high-temperature user 10, at this time the first mechanical refrigeration unit 7 is closed, and the operation mode is three: when the temperature of the outlet liquid of the surface heat exchanger 4 in the dry indirect evaporative refrigeration unit is high, it is not enough to meet When the high-temperature user is cooling, the first mechanical refrigeration unit 7 is turned on to perform supplementary refrigeration. In this system form, the high-temperature user 10 and the low-temperature user 11 respectively pass through the cooling medium of different temperatures, and the air passes through the high-temperature and low-temperature cooling medium. The step-by-step cooling makes full use of natural cooling and reduces operating energy consumption.

As shown in Figure 3, a bypass and a second valve 14 are sequentially arranged on the pipeline connecting the outlet of the first circulating pump 6 to the inlet of the condenser of the first mechanical refrigeration unit 7, and the bypass is connected to the plate heat exchanger through the first valve 13 12 The inlet of the primary side, the outlet pipe of the secondary side is connected to the connecting pipeline between the second valve 14 and the inlet of the condenser of the first mechanical refrigeration unit 7, and the outlet pipe of the evaporator of the first mechanical refrigeration unit 7 passes through the second cycle The pump 8 and the user 9 are connected to the inlet of the secondary side of the plate heat exchanger 12 , and the outlet pipe of the secondary side is connected to the inlet of the evaporator of the first mechanical refrigeration unit 7 . Operation mode 1: When the dry bulb temperature of the outdoor air is relatively low, the circulating water pump of the direct evaporative cooling device 3 is turned off, and the outdoor low-temperature air enters the surface heat exchanger 4 through the air inlet to cool the cooling medium in the surface heat exchanger 4 , the temperature-reduced cooling medium passes through the first valve 13 under the action of the first circulating pump 6, and enters the primary side of the plate heat exchanger 12, and the return liquid on the primary side of the plate heat exchanger 12 enters the condensation of the first mechanical refrigeration unit 7 The outlet liquid of the condenser further enters the surface heat exchanger 4 to circulate and cool down, and the cooling medium on the secondary side of the plate heat exchanger 12 is used for cooling by the user. At this time, the first mechanical refrigeration unit 7 is closed, and the first valve 13 is opened. , the second valve 14 is closed, and the dry-type indirect evaporative refrigeration unit is used for dry-type natural cooling and refrigeration; operation mode 2: when the outdoor air has a relatively high dry-bulb temperature and a relatively low wet-bulb temperature, the direct evaporative refrigeration device 3 is turned on, and the outdoor air passes through The direct evaporative refrigeration device 3 is cooled, and the air after the temperature drops enters the surface heat exchanger 4 to cool the cooling medium, and the dry indirect evaporative refrigeration unit starts the wet operation mode. At this time, the first mechanical refrigeration unit 7 is closed, and the first valve 13 is opened. , the second valve 14 is closed; operation mode three: when the outdoor air is dry and the wet bulb temperature is relatively high, the direct evaporative refrigeration device 3 is turned on, and the temperature of the cooling medium produced by the surface heat exchanger 4 is not enough to meet the cooling requirements of the user. , turn on the first mechanical refrigeration unit 7 to perform mixed refrigeration, and the outlet liquid from the primary side of the plate heat exchanger 12 enters the condenser as the cooling water of the first mechanical refrigeration unit 7, and returns to the surface type after the temperature of the outlet liquid of the condenser rises. The heat exchanger 4 is recycled by air cooling, and the output liquid from the secondary side of the plate heat exchanger 12 enters the evaporator of the first mechanical refrigeration unit 7 for further cooling. The outlet liquid temperature of the heat exchanger 4 is relatively high, and when the outlet liquid of the user on the secondary side of the plate heat exchanger 12 can no longer be cooled, the outlet liquid of the surface heat exchanger 4 is used as the cooling water of the first mechanical refrigeration unit 7 , the low-temperature carrying cold medium produced by the first mechanical refrigeration unit 7 is used for user refrigeration, at this time the first valve 13 is closed, the second valve 14 is opened, and the cold carrying medium circulated on the primary side and the secondary side of the plate heat exchanger can be Water or antifreeze (such as ethylene glycol).

As shown in Figure 4, the outlet pipe of the condenser of the first mechanical refrigeration unit 7 is connected to the inlet of the condenser of the second mechanical refrigeration unit 17, and its outlet pipe is connected to the inlet of the surface heat exchanger 4, and the second mechanical refrigeration unit 17 The outlet pipe of the evaporator is connected to the inlet of the secondary side of the plate heat exchanger 12 through the second circulation pump 8 and the user 9, and the outlet pipe of the evaporator of the first mechanical refrigeration unit 7 is connected to the inlet of the evaporator of the second mechanical refrigeration unit 17 . The cooling water and chilled water channels of the two mechanical refrigeration units are connected in series. When the user’s water temperature rises relatively large, the temperature difference of a single mechanical refrigeration unit is reduced, and the energy efficiency of the mechanical refrigeration unit is improved.

As shown in Figure 5 and Figure 6, an indirect evaporative cooling section 15 is arranged between the air inlet 1 in the cabinet and the direct evaporative refrigeration device 3; or/and the pipe between the outlet pipe of the first circulation pump 6 and the bypass A liquid-to-liquid heat exchanger 16 is provided along the way. An indirect evaporative cooling section 15 is set on the air inlet side of the direct evaporative cooling device 3, and the indirect evaporative cooling section 15 is used to reduce the dry and wet bulb temperature of the incoming air, increase the running time of natural cooling, and reduce the configuration of the mechanical refrigeration unit , better energy saving; a liquid-liquid heat exchanger 16 is installed on the water outlet side of the surface heat exchanger 4, and during summer operation, the cooling medium is further cooled through the liquid-liquid heat exchanger 16 to reduce the temperature of the cooling medium , when only the outlet liquid of the surface heat exchanger 4 is only used as the cooling water of the mechanical refrigeration unit, the cooling water temperature of the condenser is reduced, thereby reducing the energy consumption of the mechanical refrigeration unit.

Claims (6)

1. The utility model provides a water-saving closed cooling air conditioning system, includes dry-type indirect evaporation refrigerating unit and mechanical refrigeration unit, and dry-type indirect evaporation refrigerating unit includes direct evaporation refrigerating plant (3), surface formula heat exchanger (4), exhaust fan (5) and quick-witted case, characterized by: the outlet pipe of the surface type heat exchanger (4) is connected with the inlet of a condenser of the first mechanical refrigerating unit (7) through a first circulating pump (6), the outlet pipe of the condenser is connected with the inlet of the surface type heat exchanger (4), and the outlet pipe of the evaporator of the first mechanical refrigerating unit (7) is connected with the inlet of the evaporator of the first mechanical refrigerating unit (7) through a second circulating pump (8) and a user (9).

2. A water-saving closed cooling air conditioning system as claimed in claim 1, wherein: a direct evaporation refrigerating device (3), a surface type heat exchanger (4) and an exhaust fan (5) are sequentially arranged in a case with an air inlet (1) and an air outlet (2) according to an air inlet direction.

3. a water-saving closed cooling air conditioning system as claimed in claim 1, wherein: the user (9) is divided into a high-temperature user (10) and a low-temperature user (11), an outlet pipe of the surface heat exchanger (4) is connected with a condenser inlet of the first mechanical refrigerating unit (7) through the first circulating pump (6) and the high-temperature user (10), and an outlet pipe of an evaporator of the first mechanical refrigerating unit (7) is connected with an inlet of an evaporator of the first mechanical refrigerating unit (7) through the second circulating pump (8) and the low-temperature user (11).

4. A water-saving closed cooling air conditioning system as claimed in claim 1, wherein: the bypass and the second valve (14) are sequentially arranged on a pipeline of which the outlet of the first circulating pump (6) is connected with the inlet of the condenser of the first mechanical refrigerating unit (7), the bypass is connected with the inlet of the primary side of the plate heat exchanger (12) through the first valve (13), the outlet pipe of the secondary side of the bypass is connected on a connecting pipeline between the second valve (14) and the inlet of the condenser of the first mechanical refrigerating unit (7), the outlet pipe of the evaporator of the first mechanical refrigerating unit (7) is connected with the inlet of the secondary side of the plate heat exchanger (12) through the second circulating pump (8) and a user (9), and the outlet pipe of the secondary side of the evaporator of the first mechanical refrigerating unit (7) is connected with the inlet of the evaporator of the.

5. A water-saving closed cooling air conditioning system as claimed in claim 4, wherein: an outlet pipe of a condenser of the first mechanical refrigerating unit (7) is connected with an inlet of a condenser of the second mechanical refrigerating unit (17), an outlet pipe of the condenser of the first mechanical refrigerating unit is connected with an inlet of the surface type heat exchanger (4), an outlet pipe of an evaporator of the second mechanical refrigerating unit (17) is connected with an inlet on the secondary side of the plate type heat exchanger (12) through a second circulating pump (8) and a user (9), and an outlet pipe of an evaporator of the first mechanical refrigerating unit (7) is connected with an inlet of an evaporator of the second mechanical refrigerating unit (17).

6. A water-saving closed cooling air conditioning system according to claim 1, 2, 3, 4 or 5, characterized in that: an indirect evaporative cooling section (15) is arranged between the air inlet (1) and the direct evaporative cooling device (3) in the case; or/and a liquid-liquid heat exchanger (16) is arranged on a pipeline between the outlet pipe of the first circulating pump (6) and the bypass.