Temperature control device for temperature and humidity verification box and temperature control method thereof

Abstract

The invention provides a temperature and humidity verification box temperature control device and a temperature control method thereof. The device comprises a cold source system and a circulating system which are connected with the primary side and the secondary side of an evaporator respectively, and the cold source system comprises a compressor, an oil separator, a condenser, a liquid storage device, a filter, a heat regenerator and a first flow adjusting valve which are sequentially connected through a pipeline; the circulating system comprises a buffer tank, a surface air cooler, a circulating pump, a first one-way valve and a pipeline heater which are sequentially connected through the pipeline. According to the device and method, the temperature control range is wide, the temperature control speed is high, the opening degree of the flow adjusting valve can be adjusted according to the current working condition, and the system performance is optimally exerted; the control precision is high, due to secondary heat exchange between the heat transfer medium and air in the box, the influence of temperature fluctuation of the heat transfer medium on the temperature in the box is reduced, and the temperature fluctuation degree in the box is smaller than or equal to + / -0.01 DEG C; the heating value of the compressor is used as a heat source, the energy efficiency ratio is high, power consumption is low, and 50% of power consumption can be saved to the maximum.

Description

technical field [0001] The invention relates to the technical field of temperature and humidity measurement, in particular to a temperature control device for a temperature and humidity test box and a temperature control method thereof. Background technique [0002] Existing temperature and humidity test boxes usually use a constant temperature water tank to keep the temperature of the circulating medium constant, and realize the internal temperature control of the box through secondary heat exchange. Since the output of the compressor cannot be adjusted according to the required temperature in the box, the circulating medium in the constant temperature tank is relatively low. Many, affecting the temperature control speed and temperature control accuracy, the fluctuation generally can only reach ±0.1 ℃, in order to balance the cooling capacity, the heater power is large, the overall equipment power consumption is high, the energy efficiency ratio is low, and it also causes a ...

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Problems solved by technology

[0002] Existing temperature and humidity test boxes usually use a constant temperature water tank to keep the temperature of the circulating medium constant, and realize the internal temperature control of the box through secondary heat exchange. Since the output of the compressor cannot be adjusted according to the required temperature in the box, the circulating medium in the constant temperature tank is relatively low. Many, affecting the temperature control speed and temperature control accuracy, the fluctuation can only reach ±0.1 ℃ in general, in order to balance the cooling capacity, the heater power is large, the overall equipment power consumption is high, the energy efficiency ratio is low, and it also causes a great waste of energy

[0003] Chinese patent application CN 101118445 A discloses a temperature control method and structure of a temperature and humidity test box, including a work area in the test box, a constant temperature water tank is installed in the test box, and a coil connected to the constant temperature water tank is installed outside the work area. The heater and refrigeration compressor adjust the temperature of the constant temperature water tank, and then adjust the temperature of the working area through the circulating water between the coil and the constant temperature water tank. Since the device provided by this patent does not adjust the output of the compressor, the constant temperature water tank is used to control The temperature is controlled in the working area, so the temperature control speed is slow and the energy efficiency ratio of the equipment is low, which also cannot meet the needs of the current verification operation

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