A highly energy efficient compression adsorption hybrid for modern HVAC
Foo, Justin En Yao
Date of Issue2015
School of Mechanical and Aerospace Engineering
In hot and humid climate like Singapore, a renewable energy-based cooling displacement ventilation system offers an attractive solution, where either a heat-driven sorption chiller or an electrically driven vapor compression chiller or their hybrid could be used as a partner system for the air conditioning system. Recent research efforts on the design of zero energy buildings have a trend to apply chiller as the main device in HVAC system, and the energy consumption can be reduced to a low level employing low grade renewable energy such as waste heat or solar energy. CO2 system has proven effective for heating applications. However it has unsatisfactory cooling capacity and low coefficient of performance (COP) due to non-isothermal supercritical heat rejection in the gas cooler. It is possible to use the waste heat generated from compressor to drive an adsorption reactor. These combinations not only decrease the heat sink or condenser temperature of CO2 cooling cycle but also improve the overall COP.
Final Year Project (FYP)
Nanyang Technological University