A temperature and humidity control device and method for a low temperature constant temperature and humidity box

Abstract

The invention relates to a temperature and humidity control device for a low-temperature and constant-temperature and humidity box and a method. The temperature and humidity control device includes a constant-temperature and humidity external control unit, a constant-temperature and humidity internal control unit and an airflow channel therebetween; a heater, an evaporator and a turbulence heat exchange excitation fan are arranged in the airflow channel; the constant-temperature and humidity internal control unit is a closed constant-temperature and humidity unit comprising a test piece door with a visual window; a turbulence humidification fan and a humidification water tank are arranged at the bottom of the constant-temperature and humidity unit; the upper cover of the humidifier water tank is a louver which can be closed; the upper part of the constant-temperature and humidity internal control unit is provided with an adjustable heat and humid exchange opening which makes the interior and exterior of the constant-temperature and humidity internal control unit are communicated controllably; and the constant-temperature and humidity internal control unit is provided with a temperature and humidity test probe and a test piece tray. The temperature and humidity control device of the invention is characterized in that the constant-temperature and humidity unit operates independently and is not directly in cross linkage with heating and cooling units; and the constant-temperature and humidity unit can be in controllable linkage with the outside so as to carry out humid elimination. According to an operation method, at first, temperature is adjusted, and then independent humidification is carried out; and if humidity is too large, the adjustable heat and humid exchange opening is opened so as to be communicated with the outside to carry out humid elimination.

Description

technical field [0001] The invention belongs to the technical field of low temperature and constant temperature and humidity chambers, and in particular relates to a temperature and humidity control device and a control method for the low temperature and constant temperature and humidity chambers. Background technique [0002] The constant temperature and humidity chamber is widely used in various scientific and technological fields, and has a wide range of applications in scientific research, medical treatment, fresh-keeping and cultivation. In these areas, relative humidity plays a crucial role. [0003] For example, relative humidity is one of the factors that affect the degree of chilling injury during storage of fruits and vegetables. For some fruits and vegetables, increasing the relative humidity of the storage environment during storage can reduce the occurrence of chilling injury. At 0°C, the chilling damage spots on the fruit surface of cucumbers and peppers in an...

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Problems solved by technology

[0004] Due to the structural cross-linking relationship between the temperature of the evaporator and the temperature of the constant temperature and humidity box in the prior art, there is a large heat transfer temperature difference of about 10°C during operation. When the set temperature of the constant temperature and humidity box is 10 When the temperature is below ℃, due to the insufficient humidification capacity due to the low temperature, and the condensation effect of the evaporator on the moisture in the air in the constant temperature and humidity chamber, it is difficult for the relative humidity to reach a high humidity state, which has a major impact on the accuracy of the experimental results. Negative Effects

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