The vapor compression cycle refrigeration machine is the type of that most widely used today, generally medium as a working fluid transfers heat from product being cooled to its environment synthetic refrigerant. called Refrigerant main in air conditioning systems absorb and convert it system. This then encourages countries world including Indonesia jointly carry out prevention improvement by m...

In low-heating-energy buildings heat pumps have become an attractive heating system due to a notable reduction of the space heating requirements and the introduction of low temperature heating systems. Comfort cooling becomes also more important, especially in lightweight buildings with large south-oriented windows, which partially tend to overheat in summer. A heat pump has the unique feature ...

Refrigeration oil and other materials used with refrigerant for refrigerators or air conditioners should have thermal and chemical stability to maintain the system reliability. Some kinds of synthetic oil are used for alternative refrigerant, HFC’s and hydrolysis, material compatibility, and low-temperature extraction of contaminant or sludge are important subjects. Much more numbers and times ...

Concentration measurements and analysis have been used to develop new methodology for estimating the allowable charge limit (ACL) of flammable refrigerants, particularly R290. Attention has given impacts construction dimensional characteristics RACHP enclosures, in particular size position openings, on concentrations exiting enclosure. Analysis data shown that these are critical aspects influen...

Abstract Following the current trend of energy economy, article’s team designed a vending machine made sandwich panels, in order to minimize heat transfer from environment chilled volume. The inputs calculation was based on data provided panels’ technical sheets. In this paper, real performance operation monitored, resulting deviation between 2.27 and 5.37% theoretical values for global coeffic...

In the first part of the present research, an R290/R600 mixture was tested as a drop-in substitute in a 20cubic-feet, single-evaporator, autodefrost, topmount, conventional domestic refrigerator/freezer. All the hardware remained the same, only the capillary tube was lengthened to achieve the optimum performance. The best result with an optimized R290/R600 blend was 6% savings compared to the b...

Global warming is one of the most pressing issues world facing today. The refrigeration sector, major contributors to global warming, needs follow a methodological approach address this issue. This paper evaluates overall impact along with thermodynamic performance different generations refrigerants in cascade system. main aim comparative study present comprehensive outlook on environmental ref...

In this work, a method for the characterization of plate heat exchanger working as evaporator is presented. It based on one-dimensional discretization exchanger, which solves transfer balance equations by means an iterative methodology area converging method. The inputs are flow rates fluids, inlet enthalpy refrigerant, superheating, and temperature pressure secondary fluid. Once refrigerant as...