Abstract
Cooling systems have been widely used in the industry. In order to satisfy cooling processes with large temperature ranges, cascade cooling systems included different cooling methods have been developed. However, waste heat in such processes could still be recovered instead of being cooled down in further operations. There are many waste heat recovery technologies, but a systematic method to implement such technologies in a cascade cooling system optimally has not been well studied. This paper presents a new cascade cooling system considering waste heat recovery via Organic Rankine Cycle (ORC) and absorption refrigeration (AR). An optimization method for minimizing the total annual cost has been proposed to distribute the cooling duty for different cooling methods. A case study is conducted to validate the economic advantages of the proposed method. From the results, the scheme using AR can reduce the total annual cost by 37.5% and the scheme using ORC can reduce the total annual cost by 42.8%. Results show that in cases where the heat source supply temperature is higher than 123 °C, ORC will achieve higher economic benefits. Otherwise, AR is economically superior to ORC. The method can also indicate how to distribute cooling duty between different cooling method.
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