Abstract
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 rooms around it, as well as the outdoor temperature and the evaporation temperature in air coolers. The dynamic heat gain from warehouse structures and air coolers was simulated based on the measured temperatures and operation mode of refrigeration system. An verified food freezing model was applied to model the heat load of food products to analyze the influence of air temperature on freezing process. 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. Due to the large transients induced by on/off control strategy of refrigeration system, the refrigeration capacity changes greatly during freezing process which has the same trend as the heat load of 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 be applied at different stages of food freeing from energy-saving point.
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