Double variable-capacity heat pump type combined cooling and heating system and control method thereof

Abstract

The invention discloses a double variable-capacity heat pump type combined cooling and heating system and a control method thereof, and relates to combined heating and refrigerating systems operated alternately or simultaneously, in particular to the heat pump type combined cooling and heating system and the control method thereof for food processing. An air supply subsystem comprises a master temperature control area and auxiliary temperature control areas, wherein the master temperature control area and the auxiliary temperature control areas are connected in series in the order from low supply air temperature to high supply air temperature, a variable-frequency fan of a later temperature control area sequentially conveys airflow of a previous temperature control area into the later temperature control area, and then supply airflow can meet the requirements of the later temperature control area. Through the temperature control areas arranged in the order from the low supply air temperature to the high supply air temperature, the operation frequency of the variable-frequency fans is controlled, the air capacity of each temperature control area is controlled, and serial-connection variable-capacity air supply of the multiple temperature control areas is realized; through a finned evaporator branch and a cold water obtaining branch, parallel-connection circulation of refrigerants is formed; and through interactive adjustment of a flow valve and electronic expansion valves, variable-capacity adjustment of the refrigerants is realized, and automatic temperature control is realized in the production technology process. Thus, the system can be stably operated in different cooling and heating loads, and efficient and energy-saving operation can be realized.

Description

technical field [0001] The invention relates to a combined heating and cooling system operating alternately or simultaneously, in particular to a heat pump combined cooling and heating system for food processing and a control method for the system. Background technique [0002] In the food processing industry, the food processing process has strict requirements on temperature and humidity. However, the traditional process auxiliary temperature adjustment device is relatively backward. For products that need to be dried, the corresponding heat is supplied by steam heating or fossil fuel combustion (for example: mushroom drying, etc.); for the production process that requires refrigeration, simply use refrigeration devices to meet production needs (for example: deep sea processing of fish). by figure 1 The chocolate processing technology shown is an example, and each process has strict requirements on temperature. China's invention patent application "a chocolate continuou...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a double-variable heat pump combined cooling and heating system, which is used to solve the technical problem of using a combined system of heat pump heating and cooling in food processing instead of traditional steam heating or heating by burning fossil fuels

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