Air conditioning and refrigeration have become necessary in modern life, accounting for more than 7.8% of greenhouse gases (GHG) emitted globally. Reducing the environmental impact these systems is crucial meeting global GHG emission targets. Two principal directions must be considered to reduce air systems. Firstly, reducing direct effect by looking at less harmful refrigerants secondly, indir...

The first and second law of thermodynamics are applied to an ionic-liquid (IL) based absorption refrigeration system for high power electronics cooling. The IL is a salt in a liquid state usually with an organic cation and inorganic anion. It provides an alternative to the normally toxic working fluids used in the chemical compression loop, such as ammonia in conventional absorption systems. Th...

A computer model representing a two-evaporator, two-intercooler refrigerator-freezer opera ting at steady-state with nonazeotropic refrigerant mixtures (CYCLEZ) has been developed at Oak Ridge National Laboratory (ORNL). This model is being used to assess the effects of system desig n and operating parameters on the cycle performance of a refrigerator-freezer designed around the L orenzMeutzner...

A summary of a thermophysical properties program for six candidate alternative. refrigerants is given. This work has been performed recently at the National Institute of Standards and Technology (U.S.A.), Thermophysics Division, in Gaithersburg, Maryland. Properties measured include gas and liquid·phase PVT, vapo~ pressures, surface tension, index of ~efraction, dielect~ie eons~ant, gas phase s...

The effect of the hydrochlorofluorocarbon (HCFC) and hydrofluorocarbon (HFC) refrigerants on environment through attack its halogen contents-chlorine fluorine, ozone layer toxic nature such refrigerants, has paid attention researchers to work towards getting suitable alternatives using hydrocarbons (HC) or blends with HFC refrigerants. This study was centered a retrofit R-134A good coefficient ...

Magnetic refrigeration material is the key to adiabatic demagnetization technology. In this work, two magnetic refrigerants, Gd5(C4O4)(HCOO)3(CO3)2(OH)6·2.5H2O (1) and Gd2(OH)4SO4 (2), were prepared through hydrothermal reaction. study reveals that their entropy changes are 24.8 J kg−1 K−1 for 1 15.1 2 at K T, respectively. The of T = ∆H exceed most gadolinium hydroxyl compounds, indicating ref...

Vibration and noise are undesirable effects in daily life energy-consuming systems. In this study, the of different refrigerants on vibration a sealed reciprocating compressor discussed. The study compared performances with lower ozone depletion potential (ODP) values to R22, which has high ODP value. was carried out experimentally two stages. Firstly, tests were conducted for coefficient perfo...

Given the safety issues associated with flammability characteristics of alternative environmentally-friendly refrigerants, it is vital to establish measurement systems accurately analyse these mildly flammable refrigerants. In this study, we used a customised Hartmann bomb analogue measure minimum ignition energy (MIE) and laminar burning velocity (BV) for refrigerant/air mixtures pure ammonia ...