CN107166584B - Winter-summer dual purpose recuperation of heat indirect evaporating-cooling air-conditioning system with cobble bed accumulation of heat - Google Patents

Abstract

The winter and summer heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage disclosed by the present invention includes a heat recovery-evaporative cooling composite air-conditioning unit and a pebble bed heat storage unit arranged under the indoor ground of the building; heat recovery-evaporation The cooling composite air conditioner unit is connected to the building interior through the air supply pipe, and the heat recovery-evaporative cooling composite air conditioner unit is also connected to the return air outlet on the indoor floor of the building through the return air pipe and the buried air duct in turn; the air supply pipe It is connected to the pebble bed thermal storage unit through the connecting ventilation pipe, and a solar air heat collector is installed at the joint between the connecting ventilation pipe and the pebble bed thermal storage unit, and the pebble bed thermal storage unit is connected to the floor air supply outlet on the indoor ground of the building. connected. The dual-purpose heat recovery indirect evaporative cooling air-conditioning system for winter and summer of the present invention can realize reasonable regulation of indoor temperature of buildings with low energy consumption.

Description

Winter and summer heat recovery indirect evaporative cooling air conditioning system with pebble bed heat storage

technical field

The invention belongs to the technical field of air-conditioning systems, and in particular relates to a winter-summer heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage.

Background technique

According to relevant data, my country's building energy consumption has exceeded 500 million tons of standard coal, of which heating and air conditioning energy consumption accounts for about 50% of building energy consumption, and fresh air energy consumption accounts for more than 30% of the total air conditioning energy consumption. Air conditioning and refrigeration systems in the residential sector consume approximately 15% of the world's total electricity generation. 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, and people have to seriously consider and face them. 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.

In the existing HVAC technology, the method of directly processing outdoor fresh air is generally adopted, but it is easy to cause unnecessary waste of resources in long-term use. In fact, the air in the air-conditioned room is cool and dry in summer and warm and humid in winter, which is of great value for use. If it is directly discharged to the outside, it will cause energy waste. If this "free energy" can be effectively recovered and used, combined with Other auxiliary technologies can well solve the problems of high energy consumption and non-energy saving in existing HVAC.

Contents of the invention

The object of the present invention is to provide a dual-purpose heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage, which can realize reasonable adjustment of indoor temperature of buildings with low energy consumption.

The technical scheme adopted in the present invention is that the heat recovery indirect evaporative cooling air-conditioning system for winter and summer with pebble bed heat storage includes a heat recovery-evaporative cooling composite air-conditioning unit and a pebble bed heat storage unit installed under the indoor ground of the building ;The heat recovery-evaporative cooling composite air conditioner unit is connected to the indoor of the building through the air supply pipe, and the heat recovery-evaporative cooling composite air conditioner unit also passes through the return air duct, the buried air duct and the return air outlet on the indoor floor of the building in turn. Connection; the air supply pipe is connected to the pebble bed thermal storage unit through the connecting ventilation pipe, and a solar air collector is installed at the connection between the connecting ventilation pipe and the pebble bed thermal storage unit, and the pebble bed thermal storage unit is connected to the indoor ground of the building The floor air supply vent on the floor is connected.

The present invention is also characterized in that:

The winter and summer heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage of the present invention also includes a check valve a arranged in the connecting air pipe and a check valve b arranged in the air supply pipe.

The heat recovery-evaporative cooling composite air conditioner unit includes an organic unit casing, and an upper air passage and a lower air passage are formed in the unit casing; the structure of the upper air passage is: fresh air outlets, The air supply port and the upper air passage are provided with a filter a, a plate-fin heat exchanger, a direct evaporative cooler and a blower in sequence according to the flow direction of the fresh air inlet. A clean air flow path is formed between the filter a and the plate-fin heat exchanger. A high-pressure spray unit a and a fan are arranged in turn above the fin heat exchanger, and an air outlet is arranged on the side wall of the unit shell corresponding to the top of the clean air passage; The air outlet and the air supply outlet are located on the same side wall. In the downflow duct, filter b and a water collection box are arranged in sequence according to the flow direction after the return air enters, and the water collection box is located directly below the plate-fin heat exchanger. A return air passage is formed between the heaters, and the water collection tank is connected to the high-pressure spray unit a through a water supply pipe, and a water pump b is arranged on the water supply pipe.

Both filter a and filter b are bag filters.

The fan adopts axial flow fan.

A diffuser is arranged in the air exhaust port; an air supply volume regulating valve is arranged in the air supply port.

The high-pressure spray unit a is composed of a high-pressure spray pipe and a plurality of high-pressure micro-mist nozzles uniformly arranged on the high-pressure spray pipe and facing the plate-fin heat exchanger for spraying.

The direct evaporative cooler includes a direct evaporative cooling filler, a high-pressure spray unit b is arranged above the direct evaporative cooling filler, a water storage tank is arranged below the direct evaporative cooling filler, and the high-pressure spray unit b passes through the water storage pipe and the water storage The tank is connected, and the water storage pipe is provided with a water pump a.

The high-pressure spraying unit b is composed of a high-pressure water supply pipe and a plurality of high-pressure micro-mist nozzles uniformly arranged on the high-pressure water supply pipe and spraying directly facing the evaporative cooling filler.

The pebble bed heat storage unit includes a concrete box, the top wall of the concrete box is provided with a vent, and the vent is connected to the floor air supply port; the pebble bed is stacked in the concrete box, and an air duct is formed between the pebble bed and the top of the concrete box. The air duct communicates with the air duct.

The beneficial effects of the present invention are:

(1) The winter and summer heat recovery indirect evaporative cooling air-conditioning system of the present invention combines passive building with evaporative cooling technology, and uses cheap and easy-to-obtain pebbles as heat storage materials, which can greatly save energy consumption for heating in winter; Compared with the traditional coal-fired and water-heated floor radiation, it will not cause environmental pollution, and there is no need to worry about problems such as water pipe leakage, which is more convenient and hygienic.

(2) The plate-fin heat exchanger is adopted in the indirect evaporative cooling air-conditioning system of the present invention for dual-purpose heat recovery in winter and summer, making full use of the characteristics of the indoor return air of the building being humid and warm in winter and cool and dry in summer, and recovering the heat in the indoor return air of the building. Cooling or heat, avoiding the waste of energy caused by direct discharge of the indoor return air of the building to the outside.

(3) The plate-fin heat exchanger is used in the indirect evaporative cooling air-conditioning system of the present invention, and the high-pressure spray unit sprays water into the return air passage below the plate-fin heat exchanger to make the original temperature The temperature of the return air in the lower building is further reduced when it flows through the return air channel, which can increase the difference between the indoor and outdoor temperatures of the building and improve the working efficiency of the plate-fin heat exchanger in summer.

(4) The winter and summer dual-purpose heat recovery indirect evaporative cooling air conditioning system of the present invention combines heat recovery technology with indirect evaporative cooling technology, works as evaporative cooling in summer, and works as a typical heat recovery in winter, avoiding the original simple The disadvantage of evaporative cooling air conditioners can only be used in summer, which expands the use time range of evaporative cooling air conditioners.

(5) The indirect evaporative cooling air-conditioning system for winter and summer heat recovery of the present invention is equipped with a solar air heat collector, which can absorb solar energy and convert it into heat energy for heating in winter; the use of solar air heat collection can reduce coal Consumption, while saving energy, it can reduce the emission of harmful gases such as carbon dioxide and sulfur dioxide and particulate matter.

Description of drawings

Fig. 1 is the perspective view of the winter and summer heat recovery indirect evaporative cooling air conditioning system of the present invention;

Fig. 2 is a schematic diagram of the working principle of the indirect evaporative cooling air-conditioning system for heat recovery in winter and summer of the present invention;

Fig. 3 is a structural schematic diagram of the plate-fin heat exchanger in the indirect evaporative cooling air-conditioning system for heat recovery in winter and summer according to the present invention.

In the figure, 1. Filter a, 2. Air outlet, 3. Axial fan, 4. High-pressure spray unit a, 5. Plate-fin heat exchanger, 6. High-pressure spray unit b, 7. Direct evaporation Cooling packing, 8. Blower fan, 9. Air volume regulating valve, 10. Check valve a, 11. Check valve b, 12. Pebble bed, 13. Solar air collector, 14. Filter b, 15. Water pump a, 16. Water collection tank, 17. Water pump b, 18. Return air pipe, 19. Even ventilation pipe, 20. Air supply pipe, 21. Fresh air outlet, 22. Return air inlet, 23. Water storage tank, 24. Water supply pipe, 25. Water storage pipe, 26. Air supply outlet, 27. Return air channel, 28. Floor air supply outlet, 29. Return air outlet, 30. Buried air duct, 31. Air duct.

Detailed ways

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

The winter and summer heat recovery indirect evaporative cooling air conditioning system with pebble bed heat storage of the present invention, as shown in Figure 1 and Figure 2, includes a heat recovery-evaporative cooling composite air conditioner unit and a pebble bed storage device installed under the indoor ground of the building. Heat unit: the heat recovery-evaporative cooling composite air conditioner unit communicates with the building indoors through the air supply pipe 20, and the heat recovery-evaporative cooling composite air conditioner unit also passes through the return air duct 18, the buried air duct 30 and the indoor floor of the building in turn. The return air outlet 29 on the top is connected; the air supply pipe 20 is connected with the pebble bed thermal storage unit through the connecting ventilation pipe 19, and a solar air heat collector 13 is arranged at the joint between the connecting ventilation pipe 19 and the pebble bed thermal storage unit, and the pebble bed The heat storage unit communicates with the floor air outlet 28 arranged on the indoor floor of the building; it also includes a check valve a10 arranged in the connecting ventilation pipe 19 and a check valve b11 arranged in the air supply pipe 20 .

The heat recovery-evaporative cooling composite air conditioner unit, as shown in Figure 1, includes an organic unit casing, and an upper air duct and a lower air duct are formed in the unit housing in a vertical distribution; the structure of the upper air duct is: on the opposite side walls of the unit housing The fresh air outlet 21 and the air supply outlet 26 are respectively arranged, and the filter a1, the plate-fin heat exchanger 5, the direct evaporative cooler and the blower 8 are arranged in sequence in the upper air duct according to the flow direction of the fresh air inlet, and the filter a1 and the plate-fin heat exchanger A clean air passage is formed between the heat exchangers 5, and a high-pressure spray unit a4 and a fan 3 are sequentially arranged above the plate-fin heat exchanger 5, and an air outlet 2 is provided on the side wall of the unit shell corresponding to the top of the clean air passage; The structure of the lower air passage is as follows: it includes the return air inlet 22, and the return air outlet 22 and the air supply outlet 26 are located on the same side wall, and the filter b14 and the water collection box 16 are arranged in the down air passage according to the flow direction after the return air enters, and the water collection box 16 is located directly below the plate-fin heat exchanger 5, and a return air channel 27 is formed between the water collection tank 16 and the plate-fin heat exchanger 5. The water collection tank 16 is connected to the high-pressure spray unit a4 through the water supply pipe 24, and the water supply pipe 24 A water pump b17 is arranged on it, and the water pump b17 is a submersible pump located in the water collecting tank 16; the water collecting tank 16 is also connected to a drain pipe.

Both the filter a1 and the filter b14 are bag filters.

Fan 3 adopts an axial flow fan.

A diffuser is arranged in the air exhaust port 2 ; an air supply volume regulating valve 9 is arranged in the air supply port 26 .

The high-pressure spray unit a4 is composed of a high-pressure spray pipe and a plurality of high-pressure micro-mist nozzles uniformly arranged on the high-pressure spray pipe and facing the plate-fin heat exchanger 5 for spraying.

The plate-fin heat exchanger 5 includes a plurality of heat exchange plates arranged vertically and in parallel. When the fresh air and the return air cross flow, the fresh air channel is closed vertically, the fresh air enters along the horizontal direction, the return air channel is closed horizontally, and the return air enters from the bottom to the top along the vertical direction.

The direct evaporative cooler, as shown in Figure 1, includes a direct evaporative cooling filler 7, a high-pressure spray unit b6 is arranged above the direct evaporative cooling filler 7, a water storage tank 23 is arranged below the direct evaporative cooling filler 7, and a high-pressure spray unit b6 is arranged below the direct evaporative cooling filler 7. The shower unit b6 is connected with the water storage tank 23 through the water storage pipe 25, the water storage pipe 25 is provided with a water pump a15, and the water pump a15 is located in the water storage tank 23 and is a submersible pump; the water storage tank 23 is also connected with a drain pipe.

The high-pressure spray unit b6 is composed of a high-pressure water supply pipe and a plurality of high-pressure micro-mist nozzles uniformly arranged on the high-pressure water supply pipe and spraying towards the direct evaporative cooling filler 7 .

The pebble bed thermal storage unit, as shown in Figure 1, includes a concrete box, the top wall of the concrete box is provided with a vent, and the vent is communicated with the floor air supply port 28; An air duct is formed between the tops of the concrete box, and the air duct communicates with the air duct 19 .

The pebble bed 12 is preferably set at a depth of 40 cm to 50 cm below the indoor ground of the building to ensure that the stored heat can be used well; the pebble bed 12 is formed by a number of pebbles closely packed, and the average diameter of the pebbles is 1 cm to 10 cm, which is convenient Packed tightly for better heat storage.

The working process of the winter and summer heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage of the present invention is specifically as follows:

1. The working process of the whole system is as follows:

(1) When working in summer, open the check valve b11, close the check valve a10, and adopt the up and down return type. The specific working process is as follows:

The indoor return air of the building is sent into the buried air duct 30 through the return air outlet 29, and then sent into the heat recovery-evaporative cooling composite air conditioning unit through the buried air duct 30 through the return air duct 18 and the return air inlet 22, and is filtered by the filter b14 (bag filter) purifies the return air in the building to form a clean return air; the clean return air enters the return air channel 27 below the plate-fin heat exchanger 5, and the high-pressure spray unit a4 can The water sprayed in the return air channel 27 forms a water film in the return air channel 27, and the clean return air flows from bottom to top in the return air channel 27 to exchange heat and moisture with the water film, so that the originally low-temperature indoor return The wind temperature is further reduced to form a low-temperature return air;

Simultaneously with the above process, the outdoor fresh air enters the heat recovery-evaporative cooling composite air conditioning unit through the air inlet 21, and the outdoor fresh air is purified by the filter a1 (bag filter) to obtain clean fresh air; the clean fresh air enters the plate fin In the fresh air passage in the plate-fin heat exchanger 5, the heat is transferred to the cooled low-temperature return air through the heat exchange plate in the plate-fin heat exchanger 5, that is, the low-temperature return air is used to precool the clean fresh air to form low-temperature fresh air The low-temperature fresh air flows into the direct evaporative cooler, and direct evaporative cooling is carried out at the wet direct evaporative cooling filler 7, so that the temperature is further reduced to form cold air that meets the air supply conditions; The air supply port 26 sends out, and then sends into the building indoor through the air supply pipe 20.

(2) When working in winter, open the check valve a10, close the check valve b11, and adopt the down-feed and down-return type. The specific working process is as follows:

The return air with high indoor temperature of the building is sent into the buried air duct 30 through the return air outlet 29, and then sent into the heat recovery-evaporative cooling composite air conditioner unit through the buried air duct 30 through the return air duct 18 and the return air inlet 22 , the indoor return air of the building is purified by the filter b14 (bag filter) to form a clean return air; the clean return air enters the return air channel 27 below the plate-fin heat exchanger 5, and does not Supply water to the high-pressure spray unit a4, that is, do not spray water into the return air passage 27;

Simultaneously with the above process, the outdoor fresh air enters the heat recovery-evaporative cooling composite air conditioning unit through the air inlet 21, and the outdoor fresh air is purified by the filter a1 (bag filter) to obtain clean fresh air; the clean fresh air enters the plate fin In the fresh air channel in the heat exchanger 5, the return air with a higher temperature transfers heat to the clean fresh air in the fresh air channel through the heat exchange plate in the plate-fin heat exchanger 5, and preheats the fresh air; after preheating The fresh air flows into the direct evaporative cooler, passes through the dry direct evaporative cooling filler 7, and is sent out through the air supply port 26 under the action of the blower 8, and then enters the pebble bed thermal storage unit through the air supply pipe 20 and the ventilation pipe 19 in turn; The air heat collector 13 absorbs solar heat energy and can be pre-stored in the pebble bed 12, and the pebble bed 12 can be used to heat the preheated air sent in through the connected air pipe 19 to further increase the temperature of the fresh air to form warm air; The wind is sent into the building room through the floor air supply port 28.

2. The working process of the water system is as follows:

(1) When working in summer:

Regularly send clean water into the water collection tank 16, and then send the water into the high-pressure spray unit a4 through the water supply pipe 24 under the action of the water pump b17, and the high-pressure spray unit a4 sprays the water onto the plate from top to bottom. In the return air channel 27 below the fin heat exchanger 5, the return air in the building room performs heat and moisture exchange in the return air channel 27, and the excess water flows back to the water collection tank 16 to continue circulation;

In the direct evaporative cooler, the high-pressure spray unit b6 sprays the water in the water storage tank 23 on the direct evaporative cooling filler 7 to wet the direct evaporative cooling filler 7, and the precooled outdoor fresh air and the wet direct evaporative cooling Filling 7 carries out direct evaporative cooling, and is sent into building room after the temperature continues to drop, and the redundant water flow on direct evaporative cooling filling 7 returns in the water storage tank 23 and continues to circulate.

(2) When working in winter:

Stop supplying water to the high-pressure spray unit a4 and the high-pressure spray unit b6, keep the return air channel 27 and the direct evaporative cooling packing 7 dry, and discharge the water in the water collection tank 16 and the water storage tank 23.

The winter and summer dual-purpose heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage of the present invention can realize reasonable adjustment of the indoor temperature of buildings with low energy consumption.

Claims (8)

1. Winter and summer dual-purpose heat recovery indirect evaporative cooling air-conditioning system with pebble bed heat storage, which is characterized in that it includes a heat recovery-evaporative cooling composite air-conditioning unit and a pebble bed heat storage unit installed under the indoor floor of the building; The heat recovery-evaporative cooling composite air conditioner unit communicates with the interior of the building through the air supply pipe (20), and the heat recovery-evaporative cooling composite air conditioner unit also passes through the return air duct (18) and the buried air duct (30) in sequence. It is connected with the return air outlet (29) arranged on the indoor ground of the building; the air supply pipe (20) is connected with the heat storage unit of the pebble bed through the connecting ventilation pipe (19), and the connecting ventilation pipe (19) A solar air heat collector (13) is arranged at the connection with the pebble bed heat storage unit; the pebble bed heat storage unit communicates with the floor air supply port (28) arranged on the indoor ground of the building; It also includes a check valve a (10) arranged in the connecting air pipe (19) and a check valve b (11) arranged in the air supply pipe (20); The heat recovery-evaporative cooling composite air conditioner unit includes an organic unit casing, and an upper air duct and a lower air duct distributed up and down are formed in the unit housing; The structure of the upper air duct is as follows: fresh air outlets (21) and air supply outlets (26) are respectively arranged on the opposite side walls of the unit housing, and filters a (1 ), a plate-fin heat exchanger (5), a direct evaporative cooler and a blower (8), a clean air passage is formed between the filter a (1) and the plate-fin heat exchanger (5), and the plate A high-pressure spray unit a (4) and a fan (3) are sequentially arranged above the finned heat exchanger (5), and an air exhaust port (2) is arranged on the side wall of the unit housing corresponding to the upper part of the clean air flow channel; The structure of the lower air channel is: it includes a return air inlet (22), and the return air inlet (22) and the air supply port (26) are located on the same side wall, and the flow direction in the lower air channel is followed by the flow direction after the return air enters. A filter b (14) and a water collection box (16) are provided, and the water collection box (16) is located directly below the plate-fin heat exchanger (5), and the water collection box (16) is connected with the plate-fin heat exchanger A return air channel (27) is formed between the devices (5), the water collecting tank (16) is connected with the high-pressure spray unit a (4) through a water supply pipe (24), and a water pump b is arranged on the water supply pipe (24) (17); When working in summer, open the check valve b (11), close the check valve a (10), and the indoor return air passes through the return air outlet (29), the buried air duct (30), and the return air pipe (18) successively, and passes through The return air inlet (22) enters the heat recovery-evaporative cooling composite air conditioner unit; the outdoor fresh air enters the heat recovery-evaporative cooling composite air conditioner unit through the air inlet (21), and under the action of the blower fan (8), passes through the air supply port (26) and The air supply pipe (20) is sent into the building room; When working in winter, open the check valve a (10), close the check valve b (11), and the indoor return air passes through the return air outlet (29), the buried air duct (30), and the return air pipe (18) successively, and passes through The return air inlet (22) enters the heat recovery-evaporative cooling composite air conditioner unit; the outdoor fresh air enters the heat recovery-evaporative cooling composite air conditioner unit through the air inlet (21), and is sent out through the air supply outlet (26) under the action of the blower fan (8). , enter the pebble bed heat storage unit through the air supply pipe (20) and the ventilation pipe (19) in turn, the pebble bed (12) in the pebble bed heat storage unit heats the preheated air to form warm air, and finally passes through The floor air supply port (28) is sent into the building room. 2. The winter and summer heat recovery indirect evaporative cooling air-conditioning system according to claim 1, characterized in that the filter a (1) and the filter b (14) are both bag filters. 3. The winter and summer heat recovery indirect evaporative cooling air conditioning system according to claim 1, characterized in that the fan (3) is an axial flow fan. 4. The winter and summer heat recovery indirect evaporative cooling air-conditioning system according to claim 1, characterized in that a diffuser is arranged inside the air outlet (2); An air supply volume regulating valve (9) is arranged in the air supply port (26). 5. The dual-purpose heat recovery indirect evaporative cooling air-conditioning system for winter and summer according to claim 1, wherein the high-pressure spray unit a (4) consists of a high-pressure spray pipe and a plurality of high-pressure spray pipes evenly arranged on the high-pressure spray pipe and It consists of a high-pressure micro-mist nozzle for spraying on the plate-fin heat exchanger (5). 6. The winter and summer heat recovery indirect evaporative cooling air-conditioning system according to claim 1, characterized in that, the direct evaporative cooler includes a direct evaporative cooling filler (7), and the direct evaporative cooling filler (7) A high-pressure spray unit b (6) is provided above the direct evaporative cooling filler (7), and a water storage tank (23) is provided below the direct evaporative cooling filler (7). The high-pressure spray unit b (6) passes through the water storage pipe (25) It is connected with the water storage tank (23), and the water storage pipe (25) is provided with a water pump a (15). 7. The dual-purpose heat recovery indirect evaporative cooling air-conditioning system for winter and summer according to claim 6, characterized in that, the high-pressure spray unit b (6) consists of a high-pressure water supply pipe and a plurality of high-pressure water supply pipes evenly arranged on the high-pressure water supply pipe and faces It consists of a high-pressure micro-mist nozzle sprayed directly by evaporative cooling filler (7). 8. The winter-summer heat recovery indirect evaporative cooling air-conditioning system according to claim 1, characterized in that the pebble bed heat storage unit includes a concrete box, and the top wall of the concrete box is provided with an air vent, The vent is communicated with the floor air supply port (28); a pebble bed (12) is stacked in the concrete box, and an air duct (31) is formed between the pebble bed (12) and the top of the concrete box, and the air duct (31) is communicated with connecting air pipe (19).