Abstract In the effort to enhance recovery of waste energy, data centers are drawing attention because huge amount heat discharged from computer racks. Organic Rankine cycle (ORC) power systems a viable solution exploit servers’ heat, as it is available at very low temperatures. The purpose this study assess feasibility integrating micro-ORC system into cooling and its potential energy saving. ...

Organic Rankine cycle (ORC) system is considered as a promising technology for energy recovery from the waste heat rejected by internal combustion (IC) engines. However, such waste heat is normally contained in both coolant and exhaust gases at quite different temperatures. A single ORC system is usually unable to efficiently recover energy from both of these waste heat sources. A dual loop ORC...

Steady state and dynamic simulation and optimization are a key step in the design of heating, ventilation, airconditioning and refrigeration (HVAC&R) systems. It is well known that the computation time in such simulations is dominated by the refrigerant thermophysical property calculations. These calculations generally involve calculating all thermophysical properties given one or two independe...

The use of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) has been widely restricted. They have been replaced with hydrofluorocarbons (HFCs) in order to protect the ozone layer. However, the leakage of refrigerant into the air from active or end-of-life air conditioners is a serious environmental issue owing to the high global warming potential (GWP) of HFCs. Therefore, replaci...

• ORC and compound ejector-multi evaporator vapour compression systems are combined. Nine ultra-low global warming potential refrigerant pairs proposed to replace R134a R245fa. Condenser waste heat recovery increases the overall coefficient of performance. The pair R1234ze(Z)/R1234ze(E) results in highest energy This article evaluates exergy performance a novel dual fluid combined organic Ranki...