This paper describes thermal modeling of Vapor Compression Refrigeration System using R134a in primary circuit and AL2O3-Water based nanofluids in secondary circuit. The model uses information of the secondary fluids input conditions geometric characteristics of the system, size of nanoparticles and the compressor speed to predict the secondary fluids output temperatures, the operating pressure...

in this research, tellurium (te) film with thicknesses of 100-250 nm were deposited on ceramic substrates by thermal evaporation at 373 k. the thickness of the film was determined by rutherford backscattering spectroscopy. the influence of the thickness on the structural, morphological and molecular bonds was characterized using xrd, scanning electron microscope, and raman spectroscopy. the xrd...

• R516A, R513A, and R1234yf are compared as alternatives to R134a. The first experimental results of the R516A blend presented. R513A presents highest overall system performance by enhancement 2% in cooling mode. In mode, shows COP at low evaporating temperatures ranging from (1 15%). This work an comparison for GWP refrigerants used vapour compression heating systems. study compares three lowe...

• 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...

The evaporation coefficients of water in air and nitrogen were found as a function of temperature by studying the evaporation of a pure water droplet. The droplet was levitated in an electrodynamic trap placed in a climatic chamber maintaining atmospheric pressure. Droplet radius evolution and evaporation dynamics were studied with high precision by analyzing the angle-resolved light scattering...

In present scenario, generally VCR (Vapour Compression Refrigeration) cycle is used for heating and cooling. The adverse effect of release refrigerant like global warming ozone depletion in the atmosphere known to all. Electric heaters use electricity which obtained from thermal power plant run on fossil fuels. aim project demonstrate economic benefit using heat rejected condenser Vapour Refrig...

The range of applicability of a fundamental tool for studying the evolution of droplets, the radius-square-law , was investigated both analytically and numerically, on the basis of the experimental results of our own as well as of other authors. Standard issues were brie y discussed. Departures from the radius-square-law caused by the in uence of impurities encountered in non-ideal liquids, by ...