Apparatus and method for evaluating performance of centrifugal chiller
AssigneeMitsubishi Heavy Industries Thermal Systems, Ltd.
InventorsYoshie Togano, Kenji Ueda
Life of this patent
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Abstract
A calculating section 103 calculates a target COP that is a maximum COP that the centrifugal chiller can achieve using an arithmetic expression in which an actual device loss is given as a correction term to an expression that represents a COP characteristic under an ideal lossless environment. Since the arithmetic expression for calculating the target COP includes the heat exchange loss of the evaporator as a correction term, the heat exchange loss being calculated using a function having a load factor as a parameter, the heat exchange loss of the evaporator is reflected in the target COP.
Claims3
A centrifugal chiller comprising:
- a compressor configured to compress a refrigerant;
- a condenser configured to perform heat exchange between the refrigerant and cooling water;
- an evaporator configured to perform heat exchange between the refrigerant and chilled water;
- and
- a control unit configured to calculate a target COP that is a maximum COP that the centrifugal chiller can achieve by using an following arithmetic expression (1),
- COPct={(Tout+273.15)/(Tcout−Tout+Td)}/Cf (1)
- where COPct represents the target COP, Tout represents a chilled water outlet temperature, Tcout represents a cooling-water outlet temperature, Td represents a correction term for reflecting heat exchange loss of the evaporator, and Cf represents a correction term for reflecting a device loss due to the device characteristics of the compressor, and the correction term Td is calculated using a function having a load factor as a parameter.
Dependencies are inferred from the claim text.