Archive for March 24, 2011

New Improvements in Refrigeration

March 24, 2011 Leave a comment

New Improvements in Refrigeration:

Refrigeration is one of the leading uses of electric power in any country. The technology most often used in refrigeration, the vapour compression cycle, is 100 years old, but still having a lot scope for improving energy efficiency. Since the 1980s, the refrigeration industry has faced pressure to improve efficiency and reduce emissions of the chlorofluorocarbon (CFC) compounds used in vapour compression cooling. Attempts to decrease CFC emissions by using alternate compounds have typically made refrigeration devices less efficient.

Unfortunately, decades of attempts to improve the vapour compression refrigeration system by reducing chloro-flurocarbon (CFC) emissions have not resulted in increased efficiency or reduced the environmental impact of the system. Typically, reductions in CFC emissions lead to decreased efficiency, requiring the use of more electric power as well as the emission of
more environmental toxins from the electric-power generation process.

Ejector expansion refrigeration cycle (EERC):

An ejector expansion refrigeration cycle (EERC) process to improve the efficiency of vapour compression refrigeration by recovering energy typically lost during the process. Specifically, the EERC process uses the energy normally lost in the expansion process to help compress the gas entering the compressor. The EERC expands the liquid refrigerant in two steps. The first step is through a specifically designed nozzle where the liquid is used to increase the pressure of the gas returning to the compressor. After this stage, the liquid refrigerant is collected in a receiver where it is metered into the evaporator by conventional methods. But industry efforts to achieve EERC had not generated sufficient pressure within the ejector nozzle to enhance refrigeration efficiency.

However, the developed techniques is only able to achieve a six-percent improvement in energy expended for refrigeration through the use of the EERC. That level of improvement was not high enough to make the technology cost effective, but, with further research and refinement, EERC expected to have a 10-percent improvement for air-conditioning and up to a 20-percent improvement for other, lower temperature applications. Moreover, more efficient refrigeration would reduce both the size of the equipment needed in the process and the potential release of CFCs into the environment. When improvements reached the 10-percent threshold, cost savings would then be high enough to encourage original equipment manufacturers (OEMs) to use the EERC process. At that point, economic and environmental spillover could be achieved.

However, scientific and technical failures prevented from achieving the performance goal needed to make the EERC technology financially viable.

Categories: Technical