Energy analyzer for a refrigeration system

摘要

An energy analyzer for a refrigeration system including a refrigeration circuit having a compressor, a condenser and an evaporator, and a variable speed drive. A device contains an equation correlating refrigeration system operating performance using a variable speed drive to that of a constant speed drive without requiring the constant speed drive. The equation defines a polynomial expression having different combinations of two variables, the temperature of water entering the condenser, and the ratio defined by the variable speed drive input power divided by the design variable speed drive power. Each of these values is continuously calculated during operation of the refrigeration system. The equation solution correlates to the constant speed input power divided by the design constant speed drive power. From this, energy costs associated with operation of the refrigeration system using the constant speed drive can then be calculated with that of the variable speed drive.