PROCÉDÉ DE COMMANDE D'ÉCONOMIE D'ÉNERGIE POUR DISPOSITIF COMBINÉ DE CONGÉLATION ET DE SÉCHAGE SOUS VIDE POUR POMPE À CHALEUR À DEUX ÉTAGES DE COMPRESSION
An energy-saving control method for a vacuum freezing and drying combined device for a double-stage compression heat pump comprises the steps of: according to requirements of a food drying technology, determining the temperature T1 of a heating medium entering heating division plates (8) of a drying chamber； according to vacuum degree requirements of the combined device and changes of the thickness of a frost layer on the surface of a water catcher (12) in the operation process of the combined device, determining a functional expression of the change of the evaporation temperature T4 of the water catcher (12) along with an operation time t during the operation process of the combined device； according to the evaporation temperature T4 of the water catcher (12) in a low-pressure-stage refrigeration system and a condensing temperature T2 of a high-pressure-stage condenser (7), determining an optimal intermediate temperature T3 of an intercooler (10)； according to the functional expression of the change of the evaporation temperature T4 of the water catcher (12) with the operation time t, achieving the temperature by adjusting the opening degree of a low-pressure-stage throttling valve (11) and the rotation speed of a low-pressure-stage compressor (2)； and according to the calculation of a functional expression, determining the optimal intermediate temperature T3 of the intercooler (10), and achieving the temperature by adjusting the opening degree of a high-pressure-stage throttling valve (9) and the rotation speed of a high-pressure-stage compressor (3). The advantages are as follows: the heat supply temperature and heat of the drying chamber can be adjusted, the optimal evaporation temperature of the water catcher (12) can be determined, and the optimal intermediate temperature of the intercooler (10) can be determined, and the combined device saves energy in operation.La présente invention concerne un procédé de commande d'économie d'énergie pour un dispositif comb
