In order to improve the performance of refrigerated display cabinet

decrease the food temperature and restrain the temperature fluctuation during defrosting

a kind of composite shelf is proposed in the food refrigerated display cabinet (RDC) based on the high-thermal conductivity of heat pipe and cool storage of phase change materials. The influence of three phase change materials of RT3

RT4

RT5 on the temperature of food packages

the characteristic of heat transfer and cool storage of composite shelf were investigated. Compared with the ordinary shelf

the food temperature on composite shelf of RT3 reduces by 13.7%-80%

temperature fluctuation decreases 53.3%-70%; the food temperature on composite shelf of RT4 reduces by 20%-83.3%

temperature fluctuation decreases 83.3%-87.5%; the food temperature fluctuation on composite shelf of RT5 decreases 66.7%-75%. Compared with the other two composite shelves

the average food temperature of each floor and each row on composite shelf of RT4 is the lowest and within 5℃

thus the cool storage performance of phase change material of RT4 is the best.