Predicting the Dynamic Heat Load of Refrigerated Warehouse during Food Freezing Process

摘要

Food freezing is one of the most energy-intensive technologies used to preserve food products in domestic manufacturing operations. To acquire the heat load profile during freezing process, measurements and simulation have been conducted on a running refrigerated warehouse as part of a large cold storage. Continuous temperature measurements have been taken in the chosen room and adjacent rooms, as well as the outdoor temperature and evaporation temperature in air coolers. The dynamic heat load of warehouse transmission and air coolers was simulated based on measured temperatures and operation mode, while a verified model of food freezing was applied to simulate the heat load of food products. Results show that the heat load through warehouse structures has little impact on room temperature compared to the heat load of air coolers and food products. It can be concluded the heat load of refrigerated warehouse varies greatly at different stages of freezing process. Different control strategies of refrigeration system need to applied to the cold storage at different stages of food freeing from energy-saving point.