A dehumidification control method of a heat pump-based tunnel drying system for fish fillets and seafood

Abstract

The present invention provides a dehumidification control method of a fish fillet seafood tunnel drying system based on a heat pump. The dehumidification control method comprises the following steps: 1) a circulation fan is turned on; 2) a compressor and a dehumidification fan are turned on, opening and closing of an outdoor condenser and regulation of an opening degree of an air door are used to control the temperature within a circulation air duct to be in a set range; if the moisture content x of the part, near an evaporator side, in the circulation air duct is large than or equal to 15, the target temperature y of fins of an evaporator is 12 DEG C; if the x is equal to or larger than 7 and less than 15, the y is 0.05215*x<2>-0.4749*x+7.059; and if x is less than 7, then the y is more than or equal to 0 DEG C; and 3) a frequency of a frequency changer of the dehumidification fan is controlled to enable the surface temperature of the fins of the evaporator to be rapidly close to the y value. The above steps are conducted to realize a maximum water discharging and dehumidification efficiency control of a whole machine system.

Description

technical field [0001] The invention relates to the technical field of tunnel drying, in particular to a dehumidification control method for a heat pump-based tunnel drying system for fish fillets and seafood. Background technique [0002] At present, many fish and food companies generally use coal-fired or gas-fired boilers for large-scale dehumidification processing of fish fillets and seafood with high moisture content. The seafood is stacked in the drying room, and the boiler is used to heat the dry air. , and then use the high-temperature dried air to take away the moisture of seafood products to achieve the purpose of dehumidification. [0003] There is a drying and dehumidification system using heat pump technology. The principle of heat pump drying is as follows. The air is forced to circulate through the fan, and the moisture in the air contacts the low-temperature fin surface of the evaporator of the heat pump unit. After alternating cold and heat, the water vapor ...

AI Technical Summary

Problems solved by technology

[0009] (4) During the drying process, the user may randomly dry other different types of items at the same time, or put in fresh seafood, which will affect the prediction of the humidity change curve in the air

Therefore, during the drying process, the operating frequency of the variable frequency compressor, the opening of the throttle valve of the compressor system, and the wind speed of the variable frequency fan should be controlled according to the changes in the indoor temperature and humidity. Only when all parts are effectively coordinated can the efficiency of the entire system be improved. Highest, the process control is very complicated

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