The refrigerant R22 has great damage to the ozone layer. R404A is currently mainstream environmentally friendly approved and recommended by most countries in world, zero Based on this, performance of heat exchangers with different inlet qualities circuit number were simulated compared EVAP-COND software. results show that capacity evaporator was greater than R22. Moreover, difference R410A drop...

This paper presents irreversibility analysis using experimental data from vapor compression chiller system R22, R407C, R404A and R-134A as working fluids. The operated under cycling condition, which allowing the water to circulate in evaporator recording every ten minutes. Further, study was conducted at different ambient temperature identify parameter that cause energy deterioration. findings ...

In this work we compare semi-discrete formulations to obtain numerical solutions for the 1D Burgers equation. The formulations consist in the discretization of the time-domain via multi-stage methods of second and fourth order: R11 and R22 Padé approximants, and of the spatial-domain via finite element methods: least-squares (MEFMQ), Galerkin (MEFG) and Streamline-Upwind Petrov-Galerkin (SUPG)....

In this project an air conditioner was fabricated using R-410a as refrigerant and its COP is calculated. CFCs have been phased out, except for essential users, HCFCs are to be eliminated by 2020, because of their ozone depletion potential.This generates a need the investigation zero potential (ODP) refrigerants or blends.R410A among newer brand blend, with ODP. The biggest difference R22 pressu...

A cold room assisted vapor-compression refrigeration cycle is dynamically modeled in a year and optimized. Total annual cost (TACO) and coefficient of performance (COP) are selected as two objective functions. Both cold room and refrigeration cycle parameters are considered as design variables. Moreover, three working fluids included R22, R134a and R407c are examined. The optimum Pareto front r...

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...

Abstract—In present paper, the performance of various alternative refrigerants is compared to find the substitute of R22, the widely used hydrochlorofluorocarbon refrigerant in developing countries. These include the environmentally friendly hydrofluorocarbon (HFC) refrigerants such as R134A, R410A, R407C and M20. In the present study, a steady state thermodynamic model (includes both first and...

R22 and R410A split air-conditioning systems were tested and compared as outdoor temperature ranged from 27.8 °C (82.0 °F) to 54.4 °F (130 °F). The R410A system tests were extended to 68.3 °C (155.0 °F) ambient temperature with a customized compressor. Capacity and efficiency of both systems decreased linearly with increasing outdoor temperature, but the R410A system performance degraded more t...

In recent observations of Brownian motion of islands of adsorbed atoms and of vacancies with mean radius R, the cluster diffusion constant varies as R21 and R22. From an analytical Langevin description of the cluster’s steplike boundary, we find three cases, R21, R22, and R23, corresponding to the three microscopic surface mass-transport mechanisms of straight steps. We thereby provide a unifie...