A waste heat recovery energy-saving combined air conditioner

Abstract

The present invention relates to the field of heat recovery technology, and discloses a waste heat recovery energy-saving combined air conditioner, comprising a box body, the interior of the box body comprises a fresh air box, a return air box, a fan box, a cooling and humidifying box, an electric control box is fixedly arranged on the outside of the box body, a fresh air inlet is arranged on the outside of the fresh air box, and a first filter and a fresh air preheating heat exchanger are arranged on the inside of the fresh air box, a return air inlet is arranged on the outside of the return air box, and a second filter and a steam heater are arranged on the inside of the return air box, a centrifugal fan is arranged on the inside of the fan box, an air supply inlet is arranged on the outside of the cooling and humidifying box, and a cooling coil and a dry steam humidifier are arranged on the inside of the cooling and humidifying box. The present invention realizes the unpowered heat recovery of steam condensate, that is, the residual pressure of steam and the dead weight of condensate are used to unpoweredly flow into the fresh air preheating heat exchanger or the cooling coil, which is economical, efficient and of high practical value, and solves the problem of environmental thermal pollution caused by direct discharge of steam condensate of conventional combined air conditioners.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery, and in particular to a waste heat recovery energy-saving combined air conditioner. Background Art

[0002] Combined air conditioners are widely used in industrial centralized air conditioning fields such as electronic instruments, precision machinery manufacturing, food, biopharmaceuticals, cigarettes, textile chemicals, power stations, etc. They are also widely used in commercial centralized air conditioning fields such as shopping malls, large supermarkets, office buildings, theaters, etc. At present, the energy consumption of combined air conditioners accounts for an increasingly large proportion of building energy consumption.

[0003] The condensate heated by steam in the existing combined air-conditioning unit is directly discharged through the steam trap, which not only wastes resources but also causes thermal pollution to the environment, and does not meet the requirements of energy saving and environmental protection. Therefore, a waste heat recovery energy-saving combined air-conditioning unit is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the condensed water heated by steam in the combined air-conditioning unit in the prior art is directly discharged through the steam trap, which not only wastes resources but also causes thermal pollution to the environment and does not meet the requirements of energy conservation and environmental protection. A waste heat recovery energy-saving combined air-conditioning unit is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A waste heat recovery energy-saving combined air conditioner comprises a box body, the interior of the box body comprises a fresh air box, a return air box, a fan box, and a cooling and humidifying box, an electric control box is fixedly arranged on the outside of the box body, a fresh air inlet is arranged on the outside of the fresh air box, and a first filter and a fresh air preheating heat exchanger are arranged on the inside of the fresh air box, a return air inlet is arranged on the outside of the return air box, and a second filter and a steam heater are arranged on the inside of the return air box, a centrifugal fan is arranged on the inside of the fan box, an air supply inlet is arranged on the outside of the cooling and humidifying box, and a cooling coil and a dry steam humidifier are arranged on the inside of the cooling and humidifying box, a first stop valve is arranged at the inlet of the cooling coil, a second stop valve is arranged at the outlet of the cooling coil, and a steam heater is arranged at the inlet of the steam heater in sequence. An electric two-way valve, a steam filter and a third stop valve, a first solenoid valve is provided at the inlet of the dry steam humidifier, the inlet of the first solenoid valve is connected to the outlet of the steam filter, a first steam trap and a second steam trap are connected between the outlet of the steam heater and the outlet of the steam filter, the outlet of the first steam trap and the outlet of the second steam trap are both connected to the a port of the electric three-way valve, the b port of the electric three-way valve is connected to the inlet of the cooling coil, the c port of the electric three-way valve is connected to the inlet of the fresh air preheating heat exchanger, a second solenoid valve is connected between the outlet of the cooling coil and the inlet of the second stop valve, and the outlet of the fresh air preheating heat exchanger is connected to the outlet of the second solenoid valve.

[0007] Preferably, the fresh air inlet, return air inlet and supply air inlet are all electrically adjustable air inlets, and the fresh air inlet, return air inlet and supply air inlet are all electrically connected to the output end of the controller.

[0008] Preferably, the installation heights of the steam heater, the dry steam humidifier, the first steam trap and the second steam trap are all higher than the fresh air preheating heat exchanger and the cooling coil.

[0009] Preferably, a temperature and humidity sensor is provided on the return air outlet, the output end of the temperature and humidity sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input ends of the electric three-way valve, the electric two-way valve, the first solenoid valve and the second solenoid valve respectively.

[0010] Preferably, the electric two-way valve is of proportional-integral type, and the first solenoid valve and the second solenoid valve are both one-way normally closed solenoid valves.

[0011] Preferably, the first filter and the second filter are one of a coarse-effect filter, a medium-effect filter and a high-efficiency filter.

[0012] Compared with the prior art, the present invention provides a waste heat recovery energy-saving combined air conditioner, which has the following beneficial effects:

[0013] 1. This waste heat recovery energy-saving combined air conditioner introduces the steam condensate of the steam heater into the fresh air preheater or cooling coil to achieve fresh air preheating or return air heating, thereby recycling the heat of the steam condensate and solving the problem of environmental thermal pollution caused by the direct discharge of steam condensate from conventional combined air conditioners.

[0014] 2. This waste heat recovery energy-saving combined air conditioner integrates the electric two-way valve for steam flow regulation, the solenoid valve for humidity control, the solenoid valve for drainage control, the steam trap and the refrigerant water stop valve, the steam stop valve, the steam filter, etc. into the pipeline and the unit, thus simplifying the system and eliminating the secondary design in engineering applications.

[0015] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The present invention realizes the unpowered heat recovery of steam condensate, that is, the residual pressure of steam and the dead weight of condensate are utilized to unpoweredly flow into the fresh air preheating heat exchanger or cooling coil, which is economical, efficient and of high practical value, and solves the problem of environmental thermal pollution caused by the direct discharge of steam condensate from conventional combined air conditioners. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the working process of a waste heat recovery energy-saving combined air conditioner proposed by the present invention.

[0017] In the figure: 1 box body, 2 fan box, 3 centrifugal fan, 4 fresh air box, 5 fresh air outlet, 61 first filter, 62 second filter, 7 fresh air preheating heat exchanger, 8 electric control box, 9 return air box, 10 return air outlet, 11 temperature and humidity sensor, 12 steam heater, 13 electric two-way valve, 14 cooling and humidifying box, 151 first steam trap, 152 second steam trap, 161 first solenoid valve, 162 second solenoid valve, 17 dry steam humidifier, 18 air outlet, 19 electric three-way valve, 20 cooling coil, 21 steam filter, 221 first stop valve, 222 second stop valve, 223 third stop valve. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figure 1A waste heat recovery energy-saving combined air conditioner comprises a box body 1, wherein the interior of the box body 1 comprises a fresh air box 4, a return air box 9, a fan box 2, and a cooling and humidifying box 14, an electric control box 8 is fixedly arranged on the outside of the box body 1, a fresh air inlet 5 is arranged on the outside of the fresh air box 4, and a first filter 61 and a fresh air preheating heat exchanger 7 are arranged on the inside of the fresh air box 4, a return air inlet 10 is arranged on the outside of the return air box 9, and a second filter 62 and a steam heater 12 are arranged on the inside of the return air box 9, a centrifugal fan 3 is arranged on the inside of the fan box 2, an air supply port 18 is arranged on the outside of the cooling and humidifying box 14, and a cooling coil 20 and a dry steam humidifier 17 are arranged on the inside of the cooling and humidifying box 14, a first stop valve 221 is arranged at the inlet of the cooling coil 20, a second stop valve 222 is arranged at the outlet of the cooling coil 20, and a steam heater 12 is arranged on the inlet of the steam heater 12 in sequence. There are an electric two-way valve 13, a steam filter 21 and a third stop valve 223. A first solenoid valve 161 is provided at the inlet of the dry steam humidifier 17. The inlet of the first solenoid valve 161 is connected to the outlet of the steam filter 21. The first steam trap 151 and the second steam trap 152 are connected between the outlet of the steam heater 12 and the outlet of the steam filter 21. The outlet of the first steam trap 151 and the outlet of the second steam trap 152 are both connected to the a port of the electric three-way valve 19. The b port of the electric three-way valve 19 is connected to the inlet of the cooling coil 20. The c port of the electric three-way valve 19 is connected to the inlet of the fresh air preheating heat exchanger 7. The second solenoid valve 162 is connected between the outlet of the cooling coil 20 and the inlet of the second stop valve 222. The outlet of the fresh air preheating heat exchanger 7 is connected to the outlet of the second solenoid valve 162.

[0020] The fresh air inlet 5 , the return air inlet 10 and the supply air inlet 18 are all electrically adjustable air inlets, and the fresh air inlet 5 , the return air inlet 10 and the supply air inlet 18 are all electrically connected to the output end of the controller.

[0021] The installation heights of the steam heater 12 , the dry steam humidifier 17 , the first steam trap 151 and the second steam trap 152 are all higher than the fresh air preheating heat exchanger 7 and the cooling coil 20 .

[0022] A temperature and humidity sensor 11 is provided on the return air outlet 10, and the output end of the temperature and humidity sensor 11 is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input ends of the electric three-way valve 19, the electric two-way valve 13, the first solenoid valve 161 and the second solenoid valve 162 respectively.

[0023] The electric two-way valve 13 is of proportional-integral type, and the first solenoid valve 161 and the second solenoid valve 162 are both one-way normally closed solenoid valves.

[0024] The first filter 61 and the second filter 62 are both high efficiency filters.

[0025] In the present invention, when in use, 0.3MPa (133°C) saturated water vapor is divided into two branches after passing through the third stop valve 223 and the steam filter 21. The first branch flows through the first solenoid valve 161 and then enters the dry steam humidifier 17, and the second branch flows through the electric two-way valve 13 and then enters the steam heater 12. The condensed water generated by the heat exchange between the above-mentioned 0.3MPa (133°C) saturated water vapor and the air passes through the air blocking and drainage of the first steam trap 151 and the second steam trap 152, and then flows into the 19a port of the electric three-way valve 19 after being collected, and then flows out from the 19c port of the electric three-way valve 19 and enters the fresh air preheating heat exchanger 7, exchanges heat with the fresh air that flows into the fresh air box 4 from the fresh air inlet 5 and is filtered by the first filter 61, and is finally discharged. The preheated fresh air is mixed with the return air that flows into the return air box 9 from the return air port 10 and is filtered by the second filter 62, then flows through the steam heater 12, is heated and transported to the cooling and humidifying box 14 through the centrifugal fan 3, and finally is humidified by the dry steam humidifier 17 and sent to the air-conditioned room. In this mode, the fresh air port 5, the return air port 10 and the air supply port 18 are in an open state, and the controller controls the opening of the electric two-way valve 13 and the opening and closing of the first solenoid valve 161 according to the temperature and humidity detection values ​​of the temperature and humidity sensor 11; when the air-conditioned room does not need to introduce fresh air and only performs closed circulation, the fresh air port 5 is closed, the return air port 10 and the air supply port 18 are in an open state, and the 19a port and the 19b port of the electric three-way valve 19 are connected. The above-mentioned condensed water flows into the cooling coil 20 through the 19b port of the electric three-way valve 19. The return air flows into the return air box 9 from the return air port 10, is filtered by the second filter 62, and is transported to the cooling and humidifying box 14 by the centrifugal fan 3, exchanges heat with the condensed water in the cooling coil 20, and is finally humidified by the dry steam humidifier 17 and then transported to the air-conditioned room.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A waste heat recovery energy-saving combined air conditioner, comprising a housing (1), characterized in that: The interior of the box body (1) comprises a fresh air box (4), a return air box (9), a fan box (2), and a cooling and humidifying box (14); an electric control box (8) is fixedly provided on the outside of the box body (1); a fresh air inlet (5) is provided on the outside of the fresh air box (4), and a first filter (61) and a fresh air preheating heat exchanger (7) are provided on the inside of the fresh air box (4); a return air inlet (10) is provided on the outside of the return air box (9), and a second filter (62) and a steam heater are provided on the inside of the return air box (9). (12), a centrifugal fan (3) is provided inside the fan box (2), an air supply port (18) is provided outside the cooling and humidifying box (14), and a cooling coil (20) and a dry steam humidifier (17) are provided inside the cooling and humidifying box (14), a first stop valve (221) is provided at the inlet of the cooling coil (20), and a second stop valve (222) is provided at the outlet of the cooling coil (20), an electric two-way valve (13), a steam filter (21) and a third stop valve (223) are provided at the inlet of the steam heater (12), a first solenoid valve (161) is provided at the inlet of the dry steam humidifier (17), the inlet of the first solenoid valve (161) is connected to the outlet of the steam filter (21), a first steam trap (151) and a second steam trap (152) are connected between the outlet of the steam heater (12) and the outlet of the steam filter (21), and the outlet of the first steam trap (151) and the outlet of the second steam trap ( The outlets of the electric three-way valve (152) are connected to the port a of the electric three-way valve (19), the port b of the electric three-way valve (19) is connected to the inlet of the cooling coil (20), the port c of the electric three-way valve (19) is connected to the inlet of the fresh air preheating heat exchanger (7), the second solenoid valve (162) is connected between the outlet of the cooling coil (20) and the inlet of the second stop valve (222), and the outlet of the fresh air preheating heat exchanger (7) is connected to the outlet of the second solenoid valve (162); The fresh air inlet (5), the return air inlet (10) and the air supply inlet (18) are all electrically adjustable air inlets, and the fresh air inlet (5), the return air inlet (10) and the air supply inlet (18) are all electrically connected to the output end of the controller; The installation heights of the steam heater (12), the dry steam humidifier (17), the first steam trap (151), and the second steam trap (152) are all higher than the fresh air preheating heat exchanger (7) and the cooling coil (20).

2. The waste heat recovery energy-saving combined air conditioner according to claim 1, characterized in that: The return air port (10) is provided with a temperature and humidity sensor (11), the output end of the temperature and humidity sensor (11) is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the input ends of the electric three-way valve (19), the electric two-way valve (13), the first solenoid valve (161), and the second solenoid valve (162), respectively.

3. The waste heat recovery energy-saving combined air conditioner according to claim 1, characterized in that: The electric two-way valve (13) is of proportional-integral type, and the first solenoid valve (161) and the second solenoid valve (162) are both one-way normally closed solenoid valves.

4. The waste heat recovery energy-saving combined air conditioner according to claim 1, characterized in that: The first filter (61) and the second filter (62) are one of a coarse-effect filter, a medium-effect filter and a high-efficiency filter.

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