The performance of a temperature cascaded cogeneration system producing steam, cooling and dehumidification

摘要

This paper discusses the performance of a temperature-cascaded cogeneration plant (TCCP), equipped with an efficient waste heat recovery system. The TCCP, also called a cogeneration system, produces four types of useful energy-namely, (ⅰ) electricity, (ⅱ) steam, (ⅲ) cooling and (ⅳ) dehumidification-by utilizing single fuel source. The TCCP comprises a Capstone C-30 micro-turbine that generates nominal capacity of 26 kW of electricity, a compact and efficient waste heat recovery system and a host of waste-heat-activated devices, namely (ⅰ) a steam generator, (ⅱ) an absorption chiller, (ⅲ) an adsorption chiller and (ⅳ) a multi-bed desic-cant dehumidifier. The performance analysis was conducted under different operation conditions such as different exhaust gas temperatures. It was observed that energy utilization factor could be as high as 70% while fuel energy saving ratio was found to be 28%.