Refrigeration Cycles and Systems
Solar powered ARSs
Solar energy is a renewable and ozone-friendly energy source. Solar cooling is the most attractive subject for many engineers and scientists who work on solar energy applications. Most of the research and development efforts have been carried out using an absorption cooling system. This system is usually a preferable alternative, since it uses thermal energy [...]
27Nov2009 | admin | 0 comments | ContinuedSolar refrigeration systems
Many food products (e.g fruits, vegetables, meats, dairy products) are stored in cooling units for periods on the order of weeks at temperatures between 0 and 4°C in order to prevent spoilage and maintain freshness and quality. Food freezing systems are required for longer term storage at -18 to -35°C. Food storage and transport take [...]
27Nov2009 | admin | 0 comments | ContinuedSolar Refrigeration
The developing worldwide shortage of petroleum emphasizes the need for alternative nergy sources which are both inexpensive and clean. There has been high interest in and high potential use of renewable energy sources since the energy crisis faced during the 1970s. During the last few decades, an increasing effort based on research and development has [...]
27Nov2009 | admin | 0 comments | ContinuedThermoacoustic Refrigeration
Garrett and Hofler (1992) pointed out that two recent events are responsible for the new em in refrigeration before the beginning of the twenty-first century. The most significant of these is the international agreement (signing of the Montreal Protocol) on the production and consumption of CFCs, which were found to be causing the depletion of [...]
27Nov2009 | admin | 1 comment | ContinuedThermoelectric Refrigeration
This type of system is used to move heat from one area to another by use of electrical energy. The electrical energy, rather than the refrigerant, serves as a ‘carrier’. The essential use of thermoelectric systems has been in portable refrigerators, water coolers, cooling of scientific apparatus used in space exploration, and in aircraft. The [...]
27Nov2009 | admin | 1 comment | ContinuedSteam Jet Refrigeration Systems
In steam jet refrigeration systems, water can be used as the refrigerant. Like air, it is perfectly safe. These systems were applied successfully to refrigeration in the early years of this century. At low temperatures the saturation pressures are low (0.008129 bar at 4°C) and the specific volumes are high (157.3 m3/kg at 4°C). The [...]
27Nov2009 | admin | 1 comment | ContinuedAir-Standard Refrigeration Systems
The air-standard refrigeration cycles are also known as the reverse Brayton cycles. In these systems, refrigeration is accomplished by means of a non-condensing gas (e.g. air) cycle rather than a refrigerant vapor cycle. While the refrigeration load per kilogram of refrigerant circulated in a vapor-compression cycle is equal to a large fraction of the enthalpy [...]
27Nov2009 | admin | 0 comments | ContinuedAbsorption Refrigeration Systems – The electrochemical ARS
Recently, Newell (2000) has proposed a new electrochemical ARS as shown in Figure 3.52, which consists of four main components. An electrochemical cell is the heat absorber, equivalent to an evaporator in a conventional vapor compression refrigeration system. A fuel cell rejects heat in a manner similar to a condenser in a common vapor compression [...]
27Nov2009 | admin | 0 comments | Continued