中文摘要：

食品加工企业一般采用独立的加热或制冷设备解决生产、贮藏等过程中需要的热量和冷量,该方案不仅能耗高,而且会对环境产生危害。本文分析利用跨临界和亚临界循环相耦合的热力学循环系统为食品加工企业同时提供冷量和热量的可行性,并对循环所用的工质进行优选,在此基础上对系统热力学循环效率进行分析,最后对耦合的热力学循环系统与传统的供能方法的经济性进行比较。

英文摘要：

Heating equipment and refrigeration equipment are independently used for providing heating and cooling capacity respectively during the process of production and storage in food processing factories.This type of energy supply method consumes a lot of fossil fuel and also leads to serious effects on environment.The feasibility of using one coupled thermodynamic cycle of trans-critical and sub-critical cycle to provide heating and cooling simultaneously for food processing factories is analyzed,and the optimal fluids for this cycle are selected.On basis of that,the system efficiency of thermodynamic cycle is analyzed.At last,the economic advantages are compared between the coupled thermodynamic cycle and the traditional energy-supply method.