Energy-saving air conditioning system for biosafety laboratory and SPF animal room

Abstract

The application discloses an energy-saving air conditioning system for a biosafety laboratory and a SPF animal room, which comprises an original air conditioning system and an energy-saving recovery system, wherein the energy-saving recovery system is connected between the return air outlet, the exhaust air outlet, the fresh air inlet and the supply air outlet of the original air conditioning system; the energy-saving recovery system comprises an exhaust air cold and heat recovery system, a condensate water cold recovery system and a supply air cold recovery system; the exhaust air cold and heat recovery system comprises a fresh air pretreatment cold and heat recovery coil, a first water pump, a first water pipe, an exhaust air cold and heat recovery wet film sprayer, a second water pipe, a first valve, a third water pipe, a second valve and a first water tank; the condensate water cold recovery system comprises a second water pump, a condensate water tank, a third valve and a fourth water pipe; and the supply air cold recovery system comprises a fresh air precooling treatment coil, a fourth valve, a fresh air preheating coil, a fifth water pipe, a sixth water pipe, a third water pump, a liquid accumulator, a fifth valve and a sixth valve. The application can greatly reduce energy consumption.

Description

Technical Field

[0001] This invention relates to the field of biosafety environment and SPF animal facility, specifically an energy-saving air conditioning system for biosafety laboratories and SPF animal facilities. Background Technology

[0002] In fields such as biosafety, animal husbandry, pharmaceuticals, medicine, and scientific research, the working environment typically has requirements for temperature and humidity, purification, fresh air, and full exhaust ventilation. Air conditioning systems often operate for extended periods, sometimes even 24 hours a day without interruption.

[0003] For example, for biosafety level 2 and above laboratories, the environmental requirements are an air exchange rate of 12 to 15 times / hour, return air cannot be reused, and all fresh air must be exhausted. The temperature and humidity requirements are: temperature 18 to 25°C, relative humidity 30 to 70%.

[0004] For example, in an SPF animal facility, the environmental requirements are an air exchange rate of 15 times / hour, return air cannot be reused, and all fresh air must be exhausted. Temperature and humidity requirements are: temperature 20-26℃, maximum daily temperature difference ≤4℃, and relative humidity 40-70%.

[0005] Maintaining the above-mentioned ambient temperature and humidity has two main energy consumption points:

[0006] (1) Because all the air from the indoor air conditioner is exhausted, the energy consumption is extremely high;

[0007] (2) In summer, the outdoor temperature is high and the absolute humidity is also high. To control the indoor air humidity, it is necessary to freeze the fresh air to 5-10℃ to reduce the absolute humidity in the air, and then use a heat source to heat the fresh air to the temperature required by the environment, so as to ensure the environmental temperature and humidity requirements. The fresh air is first frozen and then heated, which causes the cold and heat to cancel each other out, resulting in serious waste and high energy consumption.

[0008] To improve the energy efficiency of air conditioning, this invention applies for an energy-saving air conditioning system for biosafety laboratories and SPF animal rooms. Summary of the Invention

[0009] The purpose of this invention is to provide an energy-saving air conditioning system for biosafety laboratories and SPF animal rooms to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving air conditioning system for biosafety laboratories and SPF animal rooms, comprising an original air conditioning system and an energy-saving recovery system, wherein the energy-saving recovery system is connected in series between the return air vent, exhaust air vent, fresh air vent, and supply air vent of the original air conditioning system. The energy-saving recovery system includes an exhaust air heat recovery system, a condensate cooling energy recovery system, and a supply air cooling energy recovery system. The exhaust air heat recovery system includes a fresh air pretreatment heat recovery coil, a first water pump, a first water pipe, an exhaust air heat recovery wet film sprayer, a second water pipe, a first valve, a third water pipe, a second valve, and a first water tank. The first water tank is located below the exhaust air heat recovery wet film sprayer. A third water pipe and a second valve are located on one side of the first water tank. The output side of the first water tank is connected to the first water pump and the fresh air pretreatment heat recovery coil through the first water pipe. The output side of the fresh air pretreatment heat recovery coil is returned to the exhaust air heat recovery wet film sprayer through the second water pipe. A first valve is located on the second water pipe.

[0011] Preferably, the condensate cooling capacity recovery system is used for pre-cooling fresh air. The condensate cooling capacity recovery system has a second water pump, a condensate tank, a third valve, and a fourth water pipe. The condensate tank is located below the surface cooling coil of the original air conditioning system. The output side of the condensate tank is connected to the second water pump, and the second water pump is connected to the first water tank of the exhaust air cooling and heat recovery system through the fourth water pipe. The third valve is installed on the fourth water pipe.

[0012] Preferably, the air supply cooling capacity recovery system includes a fresh air pre-cooling coil, a fourth valve, a chilled fresh air preheating coil, a fifth water pipe, a sixth water pipe, a third water pump, a liquid receiver, and the fifth and sixth valves, wherein the fresh air pre-cooling coil and the chilled fresh air preheating coil are connected to both sides of the surface cooling coil of the original air conditioning system.

[0013] Preferably, the supply water side of the fresh air precooling coil and the chilled fresh air preheating coil is connected through a sixth water pipe, and the sixth water pipe is sequentially equipped with a fourth valve, a sixth valve, a fifth valve, a liquid receiver, and a third water pump. The supply and return water sides of the fresh air precooling coil and the chilled fresh air preheating coil are connected through a fifth water pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention reduces energy consumption by adding an exhaust heat recovery system, which recovers exhaust heat to preheat fresh air and increase temperature in winter, and recovers exhaust cold to precool fresh air and reduce temperature in summer.

[0016] 2. This invention enhances the pre-cooling of fresh air in summer and reduces energy consumption by adding a condensate cooling recovery system.

[0017] 3. This invention reduces the energy consumption caused by the cooling and heating of fresh air in summer due to the need to freeze and then heat the fresh air to control the ambient humidity by adding a cold air recovery system. Attached Figure Description

[0018] Figure 1 This is the original air conditioning system schematic diagram;

[0019] Figure 2 This is a schematic diagram of the energy-saving air conditioning system of the present invention;

[0020] Figure 3 This is a schematic diagram of the exhaust cooling and heating recovery system of the present invention;

[0021] Figure 4 This is a schematic diagram of the condensate cooling capacity recovery system (winter hibernation) of the present invention;

[0022] Figure 5 This is a schematic diagram of the air supply cooling capacity recovery system (winter hibernation) of the present invention.

[0023] In the picture:

[0024] A. Original Air Conditioning System: A1. G4 Pre-filter; A2. F6 Medium-efficiency filter; A3. Cooling coil; A4. Cold source inlet pipe; A5. Cold source inlet valve; A6. Cold source outlet pipe; A7. Cold source outlet valve; A8. Heating coil; A9. Humidifier; A10. First supply fan; A11. Second supply fan; A12. First high-efficiency filter; A13. Activated carbon; A14. Second high-efficiency filter; A15. First exhaust fan; A16. Second exhaust fan; A17. Fresh air inlet; A18. Supply air outlet; A19. Return air outlet; A20. Exhaust air outlet;

[0025] B. Exhaust air heat recovery system; B1. Fresh air pretreatment heat recovery coil; B2. First water pump; B3. First water pipe; B4. Exhaust air heat recovery wet film sprayer; B5. Second water pipe; B6. First valve; B7. Third water pipe; B8. Second valve; B9. First water tank;

[0026] C. Condensate cooling capacity recovery system; C1. Second water pump; C2. Condensate tank; C3. Third valve; C4. Fourth water pipe;

[0027] D. Supply air cooling capacity recovery system; D1. Fresh air pre-cooling coil; D2. Fourth valve; D3. Refrigerated fresh air preheating coil; D4. Fifth water pipe; D5. Sixth water pipe; D6. Third water pump; D7. Liquid receiver; D8. Fifth valve; D9. Sixth valve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Please see Figure 1 This invention provides a technical solution: an energy-saving air conditioning system for biosafety laboratories and SPF animal rooms, comprising an original air conditioning system A and an energy-saving recovery system. The original air conditioning system A includes a G4 primary filter A1, an F6 medium-efficiency filter A2, a surface cooling coil A3, a cold source inlet pipe A4, a cold source inlet valve A5, a cold source outlet valve A6, a cold source outlet valve A7, a heating coil A8, a humidifier A9, a first supply fan A10, a second supply fan A11, a first high-efficiency filter A12, activated carbon A13, a second high-efficiency filter A14, a first exhaust fan A15, a second exhaust fan A16, a fresh air inlet A17, an air supply outlet A18, and a return air outlet. A19, exhaust vent A20, wherein activated carbon A13, second high-efficiency filter A14, first exhaust fan A15, second exhaust fan A16 are arranged sequentially from return air vent A19 to exhaust vent A20, G4 primary filter A1, F6 medium-efficiency filter A2, surface cooling coil A3, heating coil A8, humidifier A9, first supply fan A10, second supply fan A11, first high-efficiency filter A12 are arranged sequentially from fresh air vent A17 to supply air vent A18, cold source water outlet pipe A6 and cold source water inlet pipe A4 are installed on surface cooling coil A3, wherein cold source water outlet valve A7 and cold source water inlet valve A5 are respectively installed on cold source water outlet pipe A6 and cold source water inlet pipe A4.

[0032] Please see Figure 2 In this embodiment, the energy-saving recovery system is connected in series between the return air inlet A19, the exhaust air inlet A20, the fresh air inlet A17, and the supply air inlet A18 of the original air conditioning system A. The energy-saving recovery system includes an exhaust air heat recovery system B, a condensate cooling energy recovery system C, and a supply air cooling energy recovery system D.

[0033] Please see Figure 2-3 The exhaust heat recovery system B includes a fresh air pretreatment heat recovery coil B1, a first water pump B2, a first water pipe B3, an exhaust heat recovery wet membrane sprayer B4, a second water pipe B5, a first valve B6, a third water pipe B7, a second valve B8, and a first water tank B9. The first water tank B9 is located below the exhaust heat recovery wet membrane sprayer B4. The third water pipe B7 and the second valve B8 are located on one side of the first water tank B9. The output side of the first water tank B9 is connected to the first water pump B2 and the fresh air pretreatment heat recovery coil B1 through the first water pipe B3. The output side of the fresh air pretreatment heat recovery coil B1 is returned to the exhaust heat recovery wet membrane sprayer B4 through the second water pipe B5. The first valve B6 is located on the second water pipe B5.

[0034] Please see Figure 2 , 4 The condensate cooling capacity recovery system C is used to pre-cool the fresh air. The condensate cooling capacity recovery system C has a second water pump C1, a condensate tank C2, a third valve C3, and a fourth water pipe C4. The condensate tank C2 is located below the surface cooling coil A3 of the original air conditioning system A. The output side of the condensate tank C2 is connected to the second water pump C1, and the second water pump C1 is connected to the first water tank B9 of the exhaust air cooling and heat recovery system B through the fourth water pipe C4. The third valve C3 is installed on the fourth water pipe C4.

[0035] Please see Figure 2 , 5 The air supply cooling capacity recovery system D includes a fresh air pre-cooling coil D1, a fourth valve D2, a chilled fresh air preheating coil D3, a fifth water pipe D4, a sixth water pipe D5, a third water pump D6, a liquid receiver D7, a fifth valve D8, and a sixth valve D9. The fresh air pre-cooling coil D1 and the chilled fresh air preheating coil D3 are connected to both sides of the surface cooling coil A3 of the original air conditioning system A. The water supply side of the fresh air pre-cooling coil D1 and the chilled fresh air preheating coil D3 is connected through the sixth water pipe D5, and the fourth valve D2, the sixth valve D9, the fifth valve D8, the liquid receiver D7, and the third water pump D6 are distributed sequentially on the sixth water pipe D5. The supply and return water sides of the fresh air pre-cooling coil D1 and the chilled fresh air preheating coil D3 are connected through the fifth water pipe D4.

[0036] The embodiments of the present invention, based on the original air conditioning system A, add three energy recovery systems: exhaust air heat recovery system B, condensate water cooling recovery system C, and supply air cooling recovery system D.

[0037] (1) Add exhaust air heat recovery system B. Since the indoor air conditioning exhaust is too large, the energy consumption is too high. The exhaust air heat recovery wet film sprayer B4 effectively recovers part of the exhaust air heat (cold) and heat through pipelines, water pumps, water tanks and valves to transfer the heat to the fresh air pretreatment heat recovery panel B1. In winter, the exhaust air heat is recovered to preheat the fresh air and increase the temperature, and in summer, the exhaust air cold is recovered to precool the fresh air and decrease the temperature.

[0038] (2) A condensate cooling capacity recovery system C is added. In summer, the surface cooling coil A3 generates a large amount of condensate for the refrigerated fresh air. The cooling capacity of the condensate is recovered to the first water tank B9 by the second water pump C1, the condensate tank C2, the third valve C3, and the fourth water pipe C4. The fresh air is pre-cooled by the exhaust cooling and heat recovery system B, which reduces energy consumption.

[0039] It is worth noting that the system shuts down and goes into hibernation during the winter.

[0040] (3) Add a cold air recovery system D. In summer, the front temperature of the surface cooling coil A3 is higher than the back temperature, with a temperature difference of about 10℃~20℃. Utilize the refrigerated fresh air preheating coil D3, as well as water pipes, water pumps, and liquid receiver D7 to recover the cold air at the back of the surface cooling coil A3 to the fresh air precooling treatment coil D1 for precooling the fresh air at the front of the surface cooling coil A3. This reduces the energy consumption of the refrigeration source of the surface cooling coil A3. At the same time, the temperature of the fresh air at the back of the surface cooling coil A3 is increased by the refrigerated fresh air preheating coil D3, which reduces the energy consumption of the heating coil A8 for heating the fresh air.

[0041] It is worth noting that the system shuts down and goes into hibernation during the winter.

[0042] The following describes the specific air handling process of this invention during summer:

[0043] Summer air supply: Air temperature is high, and the absolute moisture content in the air is also high. The working principle and flow of this invention for an energy-saving air conditioning system with purification, temperature and humidity control, and full 100% fresh air exhaust environment are as follows: Fresh air enters through the air inlet FA (fresh air inlet A17) – passes through the G4 primary filter A1 and the F6 medium-efficiency filter A2 – then is pre-cooled by the fresh air pretreatment heat recovery coil B1 – then passes through the surface cooling coil A3 connected to a cold source, freezing the fresh air to 5-10℃ to reduce the absolute moisture content – ​​then is heated to 18-25℃ by the heating coil A8, ensuring a relative humidity of 30-70% – then is supplied by the first air supply fan A10 or the second air supply fan A11 (redundant backup to ensure 24-hour uninterrupted operation) – finally passes through the first F8 high-efficiency filter A12, delivering fresh air that meets the temperature, humidity, and cleanliness requirements into the working environment.

[0044] Summer exhaust ventilation: Indoor air conditioning air passes through the second F8 high-efficiency filter A13, then through the exhaust heat recovery wet membrane sprayer B4, effectively recovering part of the exhaust air's cooling capacity to pre-cool the fresh air at the air inlet, then through activated carbon A14 to filter organic waste gas, and then through the first exhaust fan A15 or the second exhaust fan A16 (redundant backup to ensure 24-hour uninterrupted operation), exhausting the pollution-free and safe air outdoors.

[0045] The following describes the specific air handling process of this invention during summer:

[0046] Winter air supply: The air temperature is low, and the absolute moisture content in the air is also low. The working principle of this invention for an energy-saving air conditioning system with purification, temperature and humidity control, and full fresh air exhaust is as follows: Fresh air from the air inlet FA passes through the G4 primary filter A1 and the F6 medium-efficiency filter A2, then is preheated by the fresh air pretreatment cooling and heat recovery coil B1, then heated to 18-25°C by the heating coil A8, then humidified to a relative humidity of 30-70% by the humidifier A9, then supplied by the first air supply fan A10 or the second air supply fan A11 (redundant backup, ensuring 24-hour uninterrupted operation), and finally passes through the first F8 high-efficiency filter A12, delivering fresh air that meets the temperature, humidity, and cleanliness requirements into the working environment.

[0047] Winter exhaust: Indoor air conditioning air passes through the second F8 high-efficiency filter A13, then through the exhaust heat recovery wet membrane sprayer B4, which effectively recovers some of the exhaust heat to preheat the fresh air at the air inlet, then through activated carbon A14 to filter organic waste gas, and then through the first exhaust fan A15 or the second exhaust fan A16 (redundant backup to ensure 24-hour uninterrupted operation), exhausting the pollution-free and safe air outdoors.

[0048] It is worth noting that the system of the present invention also collects data by installing environmental monitoring detectors (temperature and humidity detectors, room pressure difference detectors, particle counting detectors, airborne bacteria detectors), pressure difference detectors before and after medium-efficiency filters, pressure difference detectors before and after high-efficiency filters, wind speed sensors on biosafety cabinets, and water tank level detectors in various functional rooms and equipment of the SPF animal facility, and realizes closed-loop intelligent control of heating, humidification, refrigeration, fans, water pumps, etc.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving air conditioning system for biosafety laboratories and SPF animal rooms, characterized in that, The system includes the original air conditioning system (A) and an energy-saving recovery system. The energy-saving recovery system is connected in series between the return air vent (A19), exhaust air vent (A20), fresh air vent (A17), and supply air vent (A18) of the original air conditioning system (A). The energy-saving recovery system includes an exhaust air heat recovery system (B), a condensate cooling energy recovery system (C), and a supply air cooling energy recovery system (D). The exhaust air heat recovery system (B) includes a fresh air pretreatment heat recovery coil (B1), a first water pump (B2), a first water pipe (B3), and an exhaust air heat recovery coil. The system includes a wet membrane sprayer (B4), a second water pipe (B5), a first valve (B6), a third water pipe (B7), a second valve (B8), and a first water tank (B9). The first water tank (B9) is located below the exhaust air heat recovery wet membrane sprayer (B4). A third water pipe (B7) and a second valve (B8) are located on one side of the first water tank (B9). The output side of the first water tank (B9) is connected to a first water pump (B2) and a fresh air pretreatment heat recovery coil (B1) via a first water pipe (B3). The fresh air pretreatment heat recovery coil... The output of the air cooling capacity recovery coil (B1) is returned to the exhaust air cooling and heat recovery wet film sprayer (B4) via the second water pipe (B5). A first valve (B6) is installed on the second water pipe (B5). The air cooling capacity recovery system (D) includes a fresh air pre-cooling treatment coil (D1), a fourth valve (D2), a chilled fresh air preheating coil (D3), a fifth water pipe (D4), a sixth water pipe (D5), a third water pump (D6), a liquid receiver (D7), a fifth valve (D8), and a sixth valve (D9), wherein the fresh air pre-cooling treatment coil (D1)... The refrigerated fresh air preheating coil (D3) is connected to both sides of the surface cooling coil A3 of the original air conditioning system (A); the water supply side of the fresh air precooling coil (D1) and the refrigerated fresh air preheating coil (D3) is connected through the sixth water pipe (D5), and the sixth water pipe (D5) is sequentially equipped with the fourth valve (D2), the sixth valve (D9), the fifth valve (D8), the liquid receiver (D7), and the third water pump (D6); the water supply and return sides of the fresh air precooling coil (D1) and the refrigerated fresh air preheating coil (D3) are connected through the fifth water pipe (D4).

2. The energy-saving air conditioning system for biosafety laboratories and SPF animal rooms according to claim 1, characterized in that: The condensate cooling capacity recovery system (C) is used to pre-cool fresh air. The condensate cooling capacity recovery system (C) has a second water pump (C1), a condensate tank (C2), a third valve (C3), and a fourth water pipe (C4). The condensate tank (C2) is located below the surface cooling coil A3 of the original air conditioning system (A). The output side of the condensate tank (C2) is connected to the second water pump (C1), and the second water pump (C1) is connected to the first water tank (B9) of the exhaust air cooling and heat recovery system (B) through the fourth water pipe (C4). The third valve (C3) is installed on the fourth water pipe (C4).

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