Temperature and humidity automatic control system

Abstract

The invention discloses an automatic temperature and humidity control system which comprises a water air-conditioning system, a humidity control system and a PLC control system, the water air-conditioning system comprises two water chilling units and two hot water units, and a cold water buffer tank and two cold water pumps are arranged behind the two water chilling units; the invention belongs to the field of automatic temperature and humidity control. A water system has the advantages that the medium heat exchange temperature difference of the water system is smaller than that of a Freon system; the dew point is controllable, and the temperature and humidity can be accurately controlled according to environmental changes; the temperature difference with the target temperature in the room is small, and the room temperature can be controlled to be stable; pLC control is adopted, the temperature difference between the air supply temperature and the set temperature can be gradually reduced and finally approaches to temperature difference balance, and air supply with the minimum temperature difference is achieved; the heat exchange amount is changed when low-temperature water is converted into high-temperature water, and the heat exchange temperature difference is small; and in cooperation with a PLC automatic control system, the temperature difference, the air volume and the pressure difference are controllable.

Description

Technical Field

[0001] The invention relates to the field of automatic temperature and humidity control, and in particular to an automatic temperature and humidity control system. Background Art

[0002] The existing temperature and humidity automatic control system adopts conventional precision air conditioning, which uses large air volume ventilation, Freon cooling / dehumidification, and electric heating to complete the temperature and humidity control process. The air supply volume is large, the air supply wind speed and the blower noise are high, the system heat exchange temperature difference is large, which is not conducive to control, and the gas-liquid conversion heat exchange - phase change, the heat exchange temperature difference is large. Summary of the invention

[0003] The main purpose of the present invention is to provide a temperature and humidity automatic control system, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A temperature and humidity automatic control system, comprising a water air conditioning system, a humidity control system and a PLC control system, wherein the water air conditioning system comprises two chillers and two hot water units, a cold water buffer tank and two cold water pumps are arranged behind the two chillers, a hot water buffer tank and two hot water pumps are arranged behind the two hot water units, a room is arranged behind the two chillers and the two hot water units, an air conditioning box is arranged inside the room, an air conditioning air supply pipeline is arranged on the air conditioning box, two air conditioning return air pipelines are connected between the air conditioning box and the room, the humidity control system comprises a No. 1 primary filter and a No. 2 primary filter, a regeneration heater is arranged behind the No. 1 primary filter, a regeneration fan is arranged behind the regeneration heater, a treatment fan is arranged behind the No. 2 primary filter, a dehumidification rotor is arranged behind the treatment fan, the humidity control system is connected to the room through a fresh air supply pipeline, the PLC control system adopts PLC as a controller and a high-precision temperature and humidity sensor to realize an adaptive PID automatic control algorithm for room temperature, room humidity control, Automatic start and stop of rotary dehumidifier, automatic monitoring of room temperature and humidity and ambient temperature and humidity, condensation control and alarm, water leakage monitoring and alarm, room temperature change monitoring and fluctuation alarm.

[0005] Preferably, the room uses a four-pipe central air-conditioning system; the cold source is a dedicated low-temperature air-cooled chiller with a designed cold water supply and return temperature of 2°C / 6°C; the heat source is an air-cooled heat pump unit with a designed hot water supply and return temperature of 45°C / 40°C; the chiller and heat pump are both installed outdoors, meeting year-round operation requirements.

[0006] Preferably, the room adopts a two-pipe central air-conditioning system, the cold source is an air-cooled chiller, and the designed cold water supply and return temperature is 6°C / 11°C; the chiller is installed outdoors to meet the year-round operation requirements, and the ambient temperature is -18°C~43°C.

[0007] Preferably, the room adopts a combined air-conditioning box as the air-conditioning terminal processing device, and high-precision proportional integral temperature control valves are respectively provided on the connected cold and hot water branch pipes to adjust the valve opening to balance the cold and hot water flow, so as to meet the indoor temperature and humidity requirements, wherein: the room adopts a four-pipe water control system, and a dedicated PLC module controls the two electric temperature control valves for cold and hot water respectively according to the sampled indoor temperature and humidity signals, and executes the humidity priority mode; the room adopts a two-pipe water control system, and a dedicated PLC module directly controls the cold water electric temperature control valve according to the sampled indoor temperature signal; the end of the central air-conditioning water system is a continuously variable water volume adjustment, and the supply air dew point can be adjusted by adjusting the water temperature of the chiller, and both the humidity control ability and the temperature stability are better than the split variable frequency air conditioner plus a dedicated dehumidifier system.

[0008] Preferably, the room air supply adopts a low-speed air duct system with upper supply and lower return, in which the upper air supply uses a microporous aluminum ceiling, and forms an airflow organization similar to that of a clean room with the side and lower return air, achieving the goals of low wind noise, small indoor temperature gradient, and good temperature stability. The return air adopts a natural bottom return air method, and the size of the return air outlet is appropriately increased to control the return air flow rate. This solution can achieve the requirements of wind speed <5m / min at the lens barrel, and can also achieve the goals of low wind noise, small temperature gradient, and personnel comfort.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The advantages of using a water system are that the temperature difference of the water system medium for heat exchange is smaller than that of a Freon system; the dew point is controllable, and the temperature and humidity can be precisely controlled according to environmental changes; the temperature difference with the target temperature in the room is small, which is suitable for controlling the room temperature to be stable; with PLC control, the supply air temperature will gradually reduce the temperature difference with the set temperature, and eventually approach the temperature difference balance, achieving minimum temperature difference air supply; low-temperature water is converted to high-temperature water for heat exchange - quantitative change, and the heat exchange temperature difference is small; with the PLC automatic control system, the temperature difference, air volume, and pressure difference are controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the flow of a water air conditioning system of an automatic temperature and humidity control system of the present invention; Figure 2 It is a schematic diagram of the structure of a humidity control system of an automatic temperature and humidity control system of the present invention; Figure 3 The present invention is a schematic diagram of the room structure of an automatic temperature and humidity control system.

[0011] In the figure: 1. Chiller; 2. Cold water pump; 3. Cold water buffer tank; 4. Air conditioning box; 5. Hot water unit; 6. Hot water pump; 7. Room; 8. Air conditioning return air duct; 9. Hot water buffer tank; 10. Primary filter; 11. Regeneration heater; 12. Regeneration fan; 13. Primary filter; 14. Treatment fan; 15. Dehumidification wheel; 16. Fresh air supply duct; 17. Air conditioning supply duct. DETAILED DESCRIPTION

[0012] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0013] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0014] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] like Figure 1-3As shown, a temperature and humidity automatic control system includes a water air conditioning system, a humidity control system and a PLC control system. The water air conditioning system includes two chillers 1 and two hot water units 5. A cold water buffer tank 3 and two cold water pumps 2 are arranged behind the two chillers 1. A hot water buffer tank 9 and two hot water pumps 6 are arranged behind the two hot water units 5. A room 7 is arranged behind the two chillers 1 and the two hot water units 5. An air conditioning box 4 is arranged inside the room 7. An air conditioning air supply pipeline 17 is arranged on the air conditioning box 4. Two air conditioners are connected between the air conditioning box 4 and the room 7. Return air duct 8, the humidity control system includes a No. 1 primary filter 10 and a No. 2 primary filter 13, a regeneration heater 11 is arranged behind the No. 1 primary filter 10, a regeneration fan 12 is arranged behind the regeneration heater 11, a treatment fan 14 is arranged behind the No. 2 primary filter 13, and a dehumidification wheel 15 is arranged behind the treatment fan 14. The humidity control system is connected to the room 7 through a fresh air supply duct 16. The PLC control system uses PLC as a controller and a high-precision temperature and humidity sensor to realize an adaptive PID automatic control algorithm for room temperature, room humidity control, automatic start and stop of the rotary dehumidifier, automatic monitoring of room temperature and humidity and ambient temperature and humidity, condensation control and alarm, water leakage monitoring and alarm, room temperature change monitoring and fluctuation alarm.

[0016] The room uses a four-pipe central air-conditioning system; the cold source is a special low-temperature air-cooled chiller with a designed cold water supply and return temperature of 2°C / 6°C; the heat source is an air-cooled heat pump unit with a designed hot water supply and return temperature of 45°C / 40°C; the chiller and heat pump are both installed outdoors, meeting year-round operation requirements.

[0017] The room uses a two-pipe central air-conditioning system. The cold source is an air-cooled chiller with a designed cold water supply and return temperature of 6°C / 11°C. The chiller is installed outdoors to meet the year-round operation requirements with an ambient temperature of -18°C~43°C.

[0018] The room uses a combined air-conditioning box as the air-conditioning terminal processing device. High-precision proportional integral temperature control valves are installed on the connected cold and hot water branches to adjust the valve opening to balance the cold and hot water flow, so as to meet the indoor temperature and humidity requirements. Among them: the room adopts a four-pipe water system, and a dedicated PLC module controls the two electric temperature control valves for cold and hot water respectively according to the sampled indoor temperature and humidity signals, and executes the humidity priority mode; the room adopts a two-pipe water system, and a dedicated PLC module directly controls the cold water electric temperature control valve according to the sampled indoor temperature signal; the end of the central air-conditioning water system is a continuously variable water volume adjustment, and the supply air dew point can be adjusted by adjusting the water temperature of the chiller. Both the humidity control ability and temperature stability are better than the split variable frequency air conditioner plus a dedicated dehumidifier system.

[0019] The room air supply adopts the upper supply and lower return low-speed air duct system, in which the upper air supply uses the microporous aluminum plate ceiling, and the side and lower return air form an airflow organization similar to that of a clean room, achieving the goals of low wind noise, small indoor temperature gradient, and good temperature stability. The return air adopts the natural bottom return air method, and the size of the return air outlet is appropriately increased to control the return air flow rate. This solution can achieve the requirements of wind speed <5m / min at the lens barrel, and can also achieve the goals of low wind noise, small temperature gradient, and personnel comfort.

[0020] It should be noted that the present invention is an automatic temperature and humidity control system. The room air supply adopts a low-speed air duct system with upper supply and lower return. The upper air supply uses a microporous aluminum ceiling, and the side and lower return air form an airflow organization similar to that of a clean room, achieving the goals of low wind noise, small indoor temperature gradient, and good temperature stability. The return air adopts a natural bottom return air method, and the size of the return air outlet is appropriately increased to control the return air flow rate. This solution can achieve the goals of low wind noise, small temperature gradient, and personnel comfort.

[0021] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A temperature and humidity automatic control system, characterized in that: The invention comprises a water air conditioning system, a humidity control system and a PLC control system, wherein the water air conditioning system comprises two chillers (1) and two hot water units (5), a cold water buffer tank (3) and two cold water pumps (2) are arranged behind the two chillers (1), a hot water buffer tank (9) and two hot water pumps (6) are arranged behind the two hot water units (5), a room (7) is arranged behind the two chillers (1) and the two hot water units (5), an air conditioning box (4) is arranged inside the room (7), an air conditioning supply air pipeline (17) is arranged on the air conditioning box (4), two air conditioning return air pipelines (8) are connected between the air conditioning box (4) and the room (7), and the humidity control system comprises a first primary filter (10) and a second primary filter (11). A primary filter (13) is provided at the rear of the first primary filter (10), a regeneration heater (11) is provided at the rear of the regeneration heater (11), a regeneration fan (12) is provided at the rear of the second primary filter (13), a treatment fan (14) is provided at the rear of the treatment fan (14), a dehumidification wheel (15) is provided at the rear of the treatment fan (14), the humidity control system is connected to the room (7) via a fresh air supply pipeline (16), the PLC control system uses a PLC as a controller and a high-precision temperature and humidity sensor to realize an adaptive PID automatic control algorithm for room temperature, room humidity control, automatic start and stop of the wheel dehumidifier, automatic monitoring of room temperature and humidity and ambient temperature and humidity, condensation control and alarm, water leakage monitoring and alarm, and room temperature change monitoring and fluctuation alarm.

2. The temperature and humidity automatic control system according to claim 1, characterized in that: The room uses a four-pipe central air-conditioning system; the cold source is a special low-temperature air-cooled chiller with a designed cold water supply and return temperature of 2°C / 6°C; the heat source is an air-cooled heat pump unit with a designed hot water supply and return temperature of 45°C / 40°C; the chiller and heat pump are both installed outdoors.

3. The temperature and humidity automatic control system according to claim 1, characterized in that: The room adopts a two-pipe central air-conditioning system, the cold source is an air-cooled chiller, and the designed cold water supply and return temperature is 6°C / 11°C; the chiller is installed outdoors.

4. The temperature and humidity automatic control system according to claim 1, characterized in that: The room adopts a combined air-conditioning box as the air-conditioning terminal processing device. High-precision proportional integral temperature control valves are installed on the connected cold and hot water branches to adjust the valve opening to balance the cold and hot water flow, so as to meet the indoor temperature and humidity requirements. Among them: the room adopts a four-pipe water supply system. The dedicated PLC module controls the two electric temperature control valves for cold and hot water respectively according to the sampled indoor temperature and humidity signals, and executes the humidity priority mode; the room adopts a two-pipe water supply system. The dedicated PLC module directly controls the cold water electric temperature control valve according to the sampled indoor temperature signal; the end of the central air-conditioning water system is a continuously variable water volume adjustment, and the supply air dew point can be adjusted by adjusting the water temperature of the chiller.

5. The temperature and humidity automatic control system according to claim 1, characterized in that: The air supply adopts a top-supply and bottom-return low-speed air duct system, in which the upper air supply utilizes a microporous aluminum ceiling, and together with the side and bottom return air, forms an airflow organization similar to that of a clean room.

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