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For less detail analyses, the concept of Equivalent Full Load Hours and Integrated Part Load Value can be used. Several of these key parameters may require further definition. The issues of chiller efficiency, EFLH, IPLV, and APLV are addressed here. htm System Economics - Chiller Efficiency Chiller operating efficiency is the major component in the annual energy cost. In the past energy was cheap and plentiful, and efficiency received little attention. Older chillers can be quite inefficient. In fact, some chiller replacements will payback quite quickly just due to significantly reduced operating cost at the higher efficiency of the new unit.

The following ASHRAE Standards describe methods of testing-for-capacity-rating for various kinds of equipment. Methods of Testing for Rating Standard No. 20-1970 Remote Mechanical-Draft Air-cooled Refrigerant Condensers 22-1992* Water-cooled Refrigerant Condensers 23-1993* Positive Displacement Refrigerant Compressors and Condensing Units 24-1989* Liquid Coolers 30-1995 Liquid Chilling Packages 33-1978 Forced Circulation Air Cooling and Heating Coils 37-1988* Unitary Air-conditioning and Heat Pump Equipment 40-1986(RA92)* Heat Operated Unitary Air-conditioning Equipment for Cooling 64-1995* Remote Mechanical-Draft Evaporative Refrigerant Condensers 79-1984(RA91)* Room Fan-Coil Air Conditioners *Approved by American National Standards Institute (ANSI) *RA - Reaffirmed standard followed by year of reaffirmation.

Select from these areas of interest . . htm Pressure-Enthalpy Path The refrigeration industry didn't always have today's modern analysis tools. For many decades, manufacturers and service technicians relied on tabulated and graphical presentations of refrigerant properties and expected equipment performance. One of their favorite tools was the pressure-enthalpy diagram which defines the thermodynamic properties for the refrigerant in use and the performance of equipment. This chart shows the pressure expressed in psia (pounds per square inch absolute) along the vertical axis.

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