CN207230773U - With reference to the two-stage residual heat recovery type fresh air conditioner-mechanical of indirect evaporative cooling technology - Google Patents

Abstract

The utility model discloses a two-stage waste heat recovery type fresh air air conditioner combined with indirect evaporative cooling technology, which includes an organic unit casing, and the side wall of the unit casing is provided with fresh air outlets and exhaust outlets up and down, and the opposite unit casing The other side wall is provided with an air supply port and an air return port up and down; the first plate-fin indirect evaporative cooler and the second plate-fin indirect evaporative cooler connected by the water supply pipe b are arranged side by side in the casing of the unit, and the first The plate-fin indirect evaporative cooler is close to the fresh air outlet and the exhaust air outlet, the second plate-fin indirect evaporative cooler is close to the air supply outlet and the return air outlet, and the second plate-fin indirect evaporative cooler and the air supply outlet are arranged in turn with direct evaporative coolers. Cooler, hot and cold coils, second plate-fin indirect evaporative cooler connected to direct evaporative cooler. The two-stage waste heat recovery type fresh air air conditioner of the utility model can effectively recover the cooling capacity (heat) in the indoor exhaust air, not only can meet the year-round use requirements, but also can bear part of the indoor cooling load.

Description

Two-stage waste heat recovery fresh air air conditioner combined with indirect evaporative cooling technology

technical field

The utility model belongs to the technical field of air conditioning equipment, in particular to a two-stage waste heat recovery fresh air air conditioner combined with indirect evaporative cooling technology.

Background technique

With the rapid increase of urban population, the energy-saving problems of large-scale public buildings and residential buildings built in various regions are particularly prominent, and problems such as energy crisis, climate warming, and heat island effect have also emerged one after another. According to data, the energy consumption of buildings in my country has exceeded 500 million tons of standard coal. Among them, the energy consumption of heating and air conditioning accounts for about 50% of the energy consumption of buildings, and the energy consumption of fresh air accounts for more than 30% of the total energy consumption of air conditioning. Therefore, how to do a good job in energy saving of HVAC is also an important task of various related industries, and it has become the focus of people's attention.

The fresh air system has great energy-saving potential. In summer (winter) indoor exhaust air contains a large amount of cooling (heat), and direct discharge to the outside will cause energy waste. How to effectively recycle this "free energy" is very necessary. Therefore, efficient heat recovery units should be implemented in HVAC systems.

Utility model content

The purpose of this utility model is to provide a two-stage waste heat recovery type fresh air air conditioner combined with indirect evaporative cooling technology, which can effectively recover the cooling capacity (heat) in the indoor exhaust air, not only meet the year-round use requirements, but also undertake indoor part cooling load.

The technical scheme adopted by the utility model is that the two-stage waste heat recovery type fresh air air conditioner combined with indirect evaporative cooling technology includes an organic unit casing, and fresh air outlets and exhaust outlets are arranged up and down on the side wall of the unit casing, and On the opposite side wall of the unit shell, there are air supply outlets and return air outlets up and down; the first plate-fin indirect evaporative cooler and the second plate-fin indirect evaporative cooler connected by water supply pipe b are arranged side by side in the unit shell. cooler, and the first plate-fin indirect evaporative cooler is close to the fresh air outlet and exhaust air outlet, the second plate-fin indirect evaporative cooler is close to the air supply outlet and return air outlet, the second plate-fin indirect evaporative cooler and the air supply outlet A direct evaporative cooler, a cooling and heating coil are arranged in turn in the room, and the second plate-fin indirect evaporative cooler is connected with the direct evaporative cooler; air valves are arranged in the fresh air outlet and the return air outlet.

The utility model is also characterized in that:

A filter A is arranged between the first plate-fin indirect evaporative cooler and the fresh air outlet.

A water baffle and an exhaust fan are sequentially arranged between the first plate-fin type indirect evaporative cooler and the air outlet.

The first plate-fin indirect evaporative cooler includes a plate-fin heat exchanger A, and above the plate-fin heat exchanger A is an intermittent cloth that faces the secondary air channel spray in the plate-fin heat exchanger A. The water tank A and the plate-fin heat exchanger A are provided with a water collection tank A; the intermittent water distributor A is connected to the water supply pipe B; the water collection tank A is connected to the water supply pipe B through the first water supply branch pipe, and the first water supply branch pipe A water pump A is provided on it.

A blower fan is arranged between the second plate-fin type indirect evaporative cooler and the cold and hot coil.

A filter B is arranged between the second plate-fin indirect evaporative cooler and the air return port.

The second plate-fin indirect evaporative cooler includes a plate-fin heat exchanger B, and above the plate-fin heat exchanger B is an intermittent cloth that faces the secondary air channel spray in the plate-fin heat exchanger B. The water tank B and the plate-fin heat exchanger B are provided with a water collection tank B; the intermittent water distributor B is connected to the water supply pipe B; the water collection tank B is connected to the water supply pipe B through the second water supply branch pipe, and the second water supply branch pipe A water pump B is arranged above, and the water collection tank B is also connected with the direct evaporative cooler.

The direct evaporative cooler includes packing, and an intermittent water distributor C is arranged above the packing, and the intermittent water distributor C is connected to the water collection tank B through the water supply pipe A.

A water collecting pan is arranged under the filler, and the water collecting pan is connected with the water collecting tank B through a drain pipe.

A water pump C is provided on the water supply pipe A.

The beneficial effects of the utility model are:

(1) The two-stage waste heat recovery type fresh air air conditioner of the present utility model is equipped with two plate-fin heat exchangers, the heat exchange area is increased, and the two airflows of the indoor return air and the outdoor fresh air can perform more sufficient heat exchange , the heat exchange effect is better, and the heat of the indoor exhaust air can be fully recovered;

(2) In the two-stage waste heat recovery type fresh air air conditioner of the present utility model, the outdoor fresh air with a relatively low temperature in one plate-fin heat exchanger exchanges heat with the indoor return air, and the lower temperature in the other plate-fin heat exchanger The high-temperature outdoor fresh air exchanges heat with the relatively high-temperature indoor return air, realizing countercurrent heat exchange, and the heat exchange effect is more sufficient;

(3) In the two-stage waste heat recovery type fresh air air conditioner of the present utility model, spraying equipment is arranged above the secondary air ducts (channels for return air flow) of the two plate-fin heat exchangers, and the plate-fin The secondary air channel of the type heat exchanger sprays water to form a water film, and the return air and the water film are directly evaporatively cooled, the temperature is further reduced, and the temperature difference with the outdoor fresh air is increased, so that the heat recovery is more sufficient and the efficiency is higher;

(4) The two-stage waste heat recovery fresh air air conditioner of the present utility model can be used as an indirect evaporative cooler to recover indoor heat in summer, and can be used as a simple heat exchanger to recover indoor heat in winter. The two modes can be directly switched to ensure the The unit can be used well in winter and summer;

(5) The two-stage waste heat recovery type fresh air air conditioner of the present utility model is also provided with a direct evaporative cooler and a cooling and heating coil, which can realize different switching of multiple working conditions, and can meet the needs of outdoor fresh air in different regions and seasons. temperature and humidity requirements;

(6) The two-stage waste heat recovery fresh air air conditioner of the utility model can meet the year-round use requirements, and bear part of the indoor cooling load. During the operation, it can not only reduce energy consumption, but also keep the indoor air quality at a certain level. level of satisfaction.

Description of drawings

Fig. 1 is a schematic structural view of a two-stage waste heat recovery type fresh air air conditioner of the present invention;

Fig. 2 is a partial structural diagram of the second plate-fin indirect evaporative cooler in the two-stage waste heat recovery fresh air air conditioner of the present invention.

In the figure, 1. Filter A, 2. Plate-fin heat exchanger A, 3. Intermittent water distributor A, 4. Intermittent water distributor B, 5. Plate-fin heat exchanger B, 6. Intermittent Type water distributor C, 7. Packing, 8. Cold and hot coil, 9. Blower fan, 10. Filter B, 11. Drain pipe, 12. Water supply pipe A, 13. Water collection tank B, 14. Water pump B, 15 .Water supply pipe B, 16. Water pump A, 17. Water collection tank A, 18. Water baffle, 19. Exhaust fan, 20. Water pump C, 21. Fresh air outlet, 22. Air exhaust outlet, 23. Air supply outlet, 24. return air outlet.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model is a two-stage waste heat recovery fresh air air conditioner combined with indirect evaporative cooling technology, as shown in Figure 1, which includes an organic unit casing, and a fresh air outlet 21 and an exhaust outlet 22 are arranged up and down on the side wall of the unit casing. On the other side wall of the unit shell opposite to it, there are air supply ports 23 and air return ports 24 arranged up and down; the first plate-fin indirect evaporative cooler and the second plate-fin type indirect evaporative cooler connected through the water supply pipe b15 are arranged side by side in the unit shell. type indirect evaporative cooler, and the first plate-fin indirect evaporative cooler is close to the fresh air outlet 21 and the exhaust outlet 22, the second plate-fin indirect evaporative cooler is close to the air supply outlet 23 and the return air outlet 24, and the second plate-fin indirect A direct evaporative cooler and a cooling and heating coil 8 are sequentially arranged between the evaporative cooler and the air supply port 23, and the second plate-fin indirect evaporative cooler is connected with the direct evaporative cooler.

Air valves are all arranged in the fresh air outlet 21 , the air exhaust outlet 22 , the air supply outlet 23 and the return air outlet 24 .

A filter A1 is provided between the first plate-fin indirect evaporative cooler and the fresh air outlet 21 .

Between the first plate-fin indirect evaporative cooler and the air outlet 22, a water baffle 18 and an exhaust fan 19 are arranged in sequence.

A blower 9 is arranged between the second plate-fin indirect evaporative cooler and the cooling and heating coil 8;

A filter B10 is provided between the second plate-fin indirect evaporative cooler and the air return port 24 .

The first plate-fin indirect evaporative cooler, as shown in Figure 1, includes a plate-fin heat exchanger A2, and a secondary air duct facing the plate-fin heat exchanger A2 is arranged above the plate-fin heat exchanger A2 Intermittent water distributor A3 for spraying, a water collection tank A17 is installed under the plate-fin heat exchanger A2, the intermittent water distributor A3 is connected to the water supply pipe B15, and the water collection tank A17 is connected to the water supply pipe B15 through the first water supply branch pipe , and a water pump A16 is provided on the first water supply branch pipe.

The second plate-fin indirect evaporative cooler, as shown in Figure 1 and Figure 2, includes a plate-fin heat exchanger B5, and the top of the plate-fin heat exchanger B5 is provided with two inner plates facing the plate-fin heat exchanger B5. Intermittent water distributor B4 for secondary air channel spraying, water collecting tank B13 is installed under the plate-fin heat exchanger B5, intermittent water distributor B4 is connected to water supply pipe B15, and water collecting tank B13 is connected to the water supply through the second water supply branch pipe The pipe B15 is connected, and the second water supply branch pipe is provided with a water pump B14, and the water collection tank B13 is also connected with the direct evaporative cooler.

The direct evaporative cooler, as shown in Figure 1, includes filler 7, and an intermittent water distributor C6 is arranged above the filler 7. The intermittent water distributor C6 is connected to the water collection tank B13 through the water supply pipe A12, and the water supply pipe A12 is A water pump C20 is provided; a water collection pan is provided below the filler 7, and the water collection pan is connected to the water collection tank B13 through the drain pipe 11.

The utility model is a two-stage waste heat recovery type fresh air air conditioner combined with indirect evaporative cooling technology, and its working process is as follows:

1. The working process of the wind system is divided into three working modes: extremely hot summer, transitional season and winter. The specific working processes are as follows:

(a) In extremely hot summer, the working process is as follows:

The outdoor fresh air is filtered by the filter A1 to form clean fresh air; the clean fresh air enters the first plate-fin indirect evaporative cooler and flows in the primary air duct of the plate-fin heat exchanger A2, while the indoor low-temperature return air flows in the secondary air After heat and moisture exchange with water in the channel, the temperature decreases, which is used to pre-cool the clean fresh air; the pre-cooled fresh air enters the second plate-fin indirect evaporative cooler, and the primary air channel of the plate-fin heat exchanger B5 and the wet air Heat exchange occurs again between the secondary air duct and the indoor return air with a lower temperature after direct evaporative cooling to form fresh air with a lower temperature; the fresh air with a lower temperature enters the direct evaporative cooling, and performs isenthalpic humidification and cooling at the filler 7 Treatment, if it is in the extremely hot summer time, when the filler 7 in the direct evaporative cooler cannot meet the cooling requirements, pass cold water into the cold and hot coil 8 to further cool the fresh air, and the cooled fresh air plays the role of the blower 9 Down through the air outlet 23 into the room.

(b) Transition season:

In the hot season, the outdoor fresh air is filtered by the filter A1 to form clean fresh air; the clean fresh air enters the first plate-fin indirect evaporative cooler and flows in the primary air channel of the plate-fin heat exchanger A2, while the indoor low temperature The temperature of the return air is lowered after heat and moisture exchange with water in the secondary air duct, and it is used to pre-cool clean fresh air; the pre-cooled fresh air enters the second plate-fin indirect evaporative cooler, and the plate-fin heat exchanger B5 The primary air duct of the primary air duct exchanges heat with the humid secondary air duct and the indoor return air with a lower temperature after direct evaporative cooling to form fresh air with a lower temperature; the fresh air with a lower temperature enters the direct evaporative cooling and fills the Equal-enthalpy humidification and cooling treatment is carried out at the place to form cold air that meets the air supply conditions, and the cold air is sent into the room through the air supply port 23 under the action of the air blower 9;

During the above process, the cooling and heating coils 8 are closed, and the air treated by the filler 7 is directly sent into the room through the air supply port 23 under the action of the blower 9, and the indoor return air passes through the plate-fin heat exchanger A2, the plate-fin heat exchanger After the secondary air duct of the heater B5, it is discharged outside through the air outlet 22 under the effect of the exhaust fan 19.

(c) Winter:

The outdoor fresh air is filtered by the filter A1 to form clean fresh air; the clean fresh air enters the first plate-fin indirect evaporative cooler, flows in the primary air channel of the plate-fin heat exchanger A2 and flows in the indoor high-temperature return air channel of the secondary air channel. The wind performs heat exchange and preheats the fresh air. At this time, the secondary air duct of the plate-fin heat exchanger B5 remains dry; the preheated fresh air enters the second plate-fin indirect evaporative cooler, The heat exchange between the primary air channel of B5 and the indoor hot return air flowing in the dry secondary air channel occurs again, and the temperature of the fresh air rises. At this time, the direct evaporative cooler is turned on to humidify the relatively dry outdoor fresh air in winter, and the humidified outdoor fresh air After passing through the cooling and heating coil 8, the temperature rises to form hot air that meets the air supply conditions, and the hot air is sent into the room under the action of the blower 9.

2. The working process of the water system is divided into three working modes: extremely hot summer, transitional season and winter. The specific working processes are as follows:

(a) In summer: Regularly pass clean water into the water collecting tank A17 and water collecting tank B13, and pump the water out by the water pump A16 and the water pump B15 respectively to the intermittent water distributor A3 and the intermittent water distributor B4. The intermittent water distributor A3 sprays water to the plate-fin heat exchanger A2, and the intermittent water distributor B4 sprays water to the secondary air duct of the plate-fin heat exchanger B5. A uniform water film is formed; the indoor return air enters the secondary air channel of the plate-fin heat exchanger B5 and undergoes a direct evaporative cooling process with the water film, and the return air after the temperature drops enters the secondary air channel of the plate-fin heat exchanger A2 The direct evaporative cooling process with the water film, the non-evaporated water flows into the water collection tank A17 and the water collection tank B13 along the secondary air duct for recycling; in hot summer weather, water is passed through the direct evaporative cooler and the cooling and heating coil 8 .

(b) Transitional season: when the general hot air needs to be cooled, clean water is regularly passed into the water collection tank A17 and water collection tank B13, and the water is pumped out by the water pump A16 and the water pump B15 and sent to the intermittent water distributor A3 , Intermittent water distributor B4, the intermittent water distributor A3 sprays water to the plate-fin heat exchanger A2, and the intermittent water distributor B4 sprays water to the second stage of the plate-fin heat exchanger B5 The air duct forms a uniform water film in the secondary air duct; the indoor return air enters the secondary air duct of the plate-fin heat exchanger B5 for direct evaporative cooling with the water film, and the return air after the temperature drops enters the plate-fin heat exchanger B5. The secondary air channel of the heat exchanger A2 performs direct evaporative cooling with the water film, and the unevaporated water flows into the water collection tank A17 and the water collection tank B13 along the secondary air channel for recycling; the water is passed through the direct evaporative cooler, At this time, the cooling and heating coil 8 is closed without water supply.

(c) In winter: turn off intermittent water distributor A3 and intermittent water distributor B4, that is, do not spray water to the secondary air ducts of plate-fin heat exchanger A2 and plate-fin heat exchanger B5, and keep the secondary The air duct is dry, supplying water to the direct evaporative cooler, sprayed by the intermittent water distributor C6 for air humidification, and passing hot water to the cold and hot coil 8 for further heating the outdoor fresh air.

The utility model combines the indirect evaporative cooling technology with the two-stage waste heat recovery type fresh air air conditioner, which can meet the year-round use requirements and bear part of the indoor cooling load. During the operation process, it can not only reduce energy consumption, but also maintain indoor air quality. at a satisfactory level.

Claims (10)

1. The two-stage waste heat recovery type fresh air air conditioner combined with indirect evaporative cooling technology is characterized in that it includes an organic unit casing, and the side wall of the unit casing is provided with fresh air outlets (21) and exhaust outlets ( 22), on the other side wall of the unit housing opposite to it, there are air supply ports (23) and air return ports (24) arranged up and down; the first air outlets connected by the water supply pipe B (15) are arranged side by side in the unit housing. a plate-fin indirect evaporative cooler and a second plate-fin indirect evaporative cooler, and the first plate-fin indirect evaporative cooler is close to the fresh air outlet (21) and the exhaust outlet (22), and the second plate-fin The indirect evaporative cooler is close to the air supply port (23) and the air return port (24), and a direct evaporative cooler, a cold and hot coil ( 8), the second plate-fin indirect evaporative cooler is connected to the direct evaporative cooler; Air valves are arranged in the fresh air outlet (21) and the return air outlet (24). 2. The two-stage waste heat recovery fresh air air conditioner according to claim 1, characterized in that a filter A (1) is arranged between the first plate-fin indirect evaporative cooler and the fresh air outlet (21). 3. The two-stage waste heat recovery type fresh air air conditioner according to claim 1 or 2, characterized in that a water barrier is sequentially arranged between the first plate-fin indirect evaporative cooler and the air outlet (22) (18), exhaust fan (19). 4. The two-stage waste heat recovery fresh air air conditioner according to claim 3, wherein the first plate-fin indirect evaporative cooler includes a plate-fin heat exchanger A (2), and the plate-fin type An intermittent water distributor A(3) facing the secondary air duct spraying in the plate-fin heat exchanger A(2) is arranged above the fin heat exchanger A(2), and the plate-fin heat exchanger A(2) A water collection tank A (17) is arranged below the A (2); The intermittent water distributor A (3) is connected to the water supply pipe B (15); The water collection tank A (17) is connected to the water supply pipe B (15) through a first water supply branch pipe, and a water pump A (16) is arranged on the first water supply branch pipe. 5. The two-stage waste heat recovery fresh air air conditioner according to claim 1, characterized in that a blower (9) is arranged between the second plate-fin indirect evaporative cooler and the cooling and heating coil (8). 6. The two-stage waste heat recovery type fresh air air conditioner according to claim 1 or 5, characterized in that a filter B (10 ). 7. The two-stage waste heat recovery fresh air air conditioner according to claim 6, wherein the second plate-fin indirect evaporative cooler includes a plate-fin heat exchanger B (5), and the plate-fin type Above the fin heat exchanger B (5), there is an intermittent water distributor B (4) facing the secondary air duct spraying in the plate-fin heat exchanger B (5), and the plate-fin heat exchanger B (5) A water collecting tank B (13) is arranged below the B (5); The intermittent water distributor B (4) is connected to the water supply pipe B (15); The water collection tank B (13) is connected to the water supply pipe B (15) through the second water supply branch pipe, and the water pump B (14) is arranged on the second water supply branch pipe, and the water collection tank B (13) is also connected with the direct evaporation Cooler connection. 8. The two-stage waste heat recovery fresh air air conditioner according to claim 7, characterized in that the direct evaporative cooler includes packing (7), and an intermittent water distribution device is arranged above the packing (7). Device C (6), the intermittent water distributor C (6) is connected to the water collection tank B (13) through the water supply pipe A (12). 9. The two-stage waste heat recovery type fresh air air conditioner according to claim 8, characterized in that a water collecting pan is arranged under the filler (7), and the water collecting pan is connected to the water collecting tank through the drain pipe (11) B(13) is connected. 10. The two-stage waste heat recovery type fresh air air conditioner according to claim 8, characterized in that a water pump C (20) is arranged on the water supply pipe A (12).