Zeotropic mixtures are widely discussed as alternative refrigerants for vapor-compression cooling appliances and heat pumps. Mixtures can increase efficiency due to their nonisothermal phase change. In theoretical studies, zeotropic show significant benefits if the temperature glide of mixture matches change in transfer fluids. Such large have never been observed experiments. First, this articl...

This research was conducted in the Districts of Tebet and Setiabudi, with method field through surveys, using questionnaires. The target population is high school teachers, proportional random sampling technique, total 156 sample 112 people. Test instrument to get validity statement items reliability Pearson Product Moment Alpha Cronbach. principal's transformational leadership has a rtt = 0.94...

Today, environmental pollution and global warming have become threats. The use of renewable energy sources is a rational approach to overcome this problem, ground source heat pumps also play an important role in approach. However, the refrigerants used these systems often potential values above specified norms. In study, using Engineering Equation Solver package program, performance values, eff...

Fluorinated gases (F-gases) used as refrigerants in air conditioners have a significant global warming effect, so their release into the atmosphere must be minimized. The purpose of this study was to evaluate and compare environmental impact two treatment methods: reclamation destruction after refrigerant recovery. Plant data for R410A, R32, R134a, R22 were collected from Japan Europe evaluated...

• R1132(E) is a promising next-generation refrigerant with zero ODP and very low GWP. saturation pressures were measured between 240 K to the critical temperature. The pressure of was directly as 5172.5 ± 1.0 kPa. A Wagner-type equation optimized for pressures. acentric factor determined used in Peng-Robinson EoS. (trans-1,2-difluoroethylene, C 2 H F ) potential next generation be utilized air ...

Hydrofluorocarbons (HFC) are fluorinated compounds used globally for refrigeration. These gases have been shown to contain a greenhouse potential of up 22,000 times that CO2. Thus, 1298 type-5 deep eutectic solvents (DES) were examined the absorption and interaction mechanisms difluoromethane (R32), due their non-polar attributes. Of these solvents, quaternary ammonium salts mixed with various ...

This paper proposes a methodology aiming at determining the most influent working variables and geometrical parameters over pressure drop heat transfer during condensation process of several refrigerant gases using exchangers with pipes mini channels technology. A multi-criteria decision making (MCDM) was used; this MCDM includes mathematical method called SIMUS (Sequential Interactive Modellin...