A double variable capacity heat pump combined cooling and heating system and its control method

Abstract

A dual-variable-capacity heat pump combined cooling and heating system and a control method thereof relate to a combined heating and cooling system operating alternately or simultaneously, in particular to a heat pump type cooling and heating combined supply system for food processing and a control method thereof. The air subsystem includes a main temperature control area and an auxiliary temperature control area that are connected in series according to the supply air temperature from low to high; the variable frequency fan in the latter temperature control area sends the airflow of the previous temperature control area into this temperature control area in turn to form a consistent temperature control area. The supply air flow required by this temperature control zone. By setting the temperature control areas in series from low to high order according to the supply air temperature, the operating frequency of the variable frequency fan is controlled to adjust the air volume of each temperature control area, so as to realize the series variable volume air supply of multiple temperature control areas; The parallel circulation of the refrigerant in the cold water production branch, combined with the interactive adjustment of the flow valve and the electronic expansion valve, realizes the variable capacity adjustment of the refrigerant and the automatic temperature control in the production process, so that the system can run stably with low consumption under different cooling and heating loads. To achieve the purpose of high-efficiency and energy-saving operation.

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 fish processing). 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 continuous t...

AI Technical Summary

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

Images