The frrst part of this paper presents carbon dioxide air conditioning units which were installed in two city buses. The two buses were tested "on-the-road" during summer 1997 in Bad Hersfeld, Germany. By the end of 1997, the air condition systems of the two buses had been running together for more than 860 hours proving that C02 systems fulfill important on-the-road requirements. In the second ...

Refrigeration is one way to maintain the temperature of a material or room at lower level than ambient conditions around it by absorbing heat from room. The refrigeration system that widely used today for industrial purposes use vapor compression cycle, where in this cycle components has an important role compressor. Over time, performance compressor will decrease, so affect absorption process ...

A simple vapor-compression refrigeration system becomes ineffective and inefficient as it consumes a huge energy supply when operating between large temperature differences. Moreover, the recent Kigali amendment has raised concern about phasing out some hydrofluorocarbon refrigerants due to their impact on environment. In this paper, numerical investigation is carried compare performance of cas...

Three combined power and refrigeration system are introduced to compare and analyze for a defined demand and same fuel consumption based on thermodynamic parameters in a 24 hours period. Gas turbine and/or steam turbine are used for power generation and also ejector refrigeration cycle is used to produce cooling. These three systems are named as GER, SER and GSER. The results of three systems a...

We have been using the refrigerator for domestic purposes with various types of refrigeration varied by sizes as we notice that power consumption will be always high and they need a amount time cooling purposes. To overcome this came up an idea changing condenser coil into helically shaped copper tube 190-litre fridge are introduced 40-litre same surface area tubes which may give efficiency les...