CONTROL METHOD AND CONTROL DEVICE FOR DUAL VARIABLE-CAPACITY HEAT PUMP COMBINED COOLING AND HEATING SYSTEM

摘要

Provided is a control method and a control device for a dual variable-capacity heat pump combined cooling and heating system, particularly a control method and a control device for a heat-pump combined cooling and heating system used in food processing, comprising the following steps: configuring cold and hot water temperatures and control parameters for air supply temperatures (S100); detecting and monitoring cold and hot water temperatures and air supply temperature in each temperature-controlled zone (S200); and choosing unit operating modes according to cold and hot water temperatures and control parameters for air supply temperatures (S300). By setting up temperature-controlled zones (210, 220, 230) connected in series from low to high air supply temperatures and controlling operating frequencies of variable-frequency ventilators (10, 20, 30) to regulate air flow in each temperature-controlled zone (210, 220, 230), the invention achieves variable-capacity air supply of multiple temperature-controlled zones (210, 220, 230) connected in series. By performing circulation via a branch of a finned evaporator (11) and a branch of a refrigerating machine for cooling water production in parallel, combined with interactive regulation of a flow valve (5) and electronic expansion valves (6, 7), the invention achieves coolant variable-capacity regulation and automatic temperature control in a production process and enables the system to operate with stability and low power under different cooling and heating loads, reaching the goal of an efficient and energy-saving operation.