A vapor jet refrigeration system (VJRS) is an alternative to the conventional mechanically driven vapor-compression refrigeration system. The VJRS utilizes supersonic ejector as thermal compressor and has the potential to reduce energy consumption and utilize low grade energy for driving the refrigeration systems. In the present study, the performance characteristics of VJRS ejectors with R134a...

Two phase flow in a horizontal tube has widespread applications, particularly in the condensers of refrigeration and air conditioning systems. Pressure drop prediction is especially important for condensers because the local condensing temperature is a function of local pressure, affecting the mean temperature difference in the heat exchanger. In the present analysis, two phase flow is treated ...

To improve the performance of vapor compression refrigeration systems that use vertical gravitational flash tank separators, liquid separation efficiency separator requires to be approved. approach this improvement, two-phase flow development and its behavior after expansion device need investigated predicted. For thus, paper presents a three-dimensional computational investigation R134a in hor...

Exergy-based methods provide engineers with the best information respect to options for improving overall thermodynamic efficiency of an energy conversion system. This paper presents results advanced exergy analysis air-to-water reversible heat pump whose performance was analyzed different working fluids. Environmentally deleterious refrigerants, i.e., R410A and R134a (baselines), their eco-fri...

This paper presents an analysis of methods to increase the efficiency heat transfer in exchangers. The scope research included optimization using example two tubular exchanger structures most often used industry. obtained recovery from ground examined exchangers was over 90%, enabling reduction emissions heating systems buildings. results tests types pipes R134A, R404A, and R407C working agents...