| 摘要 |
PURPOSE: A method and apparatus is provided to display an indication to inform a user of the degree of degradation in condenser performance by calculating, in real time, the overall heat transfer coefficient for an air-cooled chiller system and comparing this value to a reference value corresponding to a new machine operating with a clean condenser. CONSTITUTION: A method comprises the steps of checking to see if the system is in a steady operating state; determining the saturated condensing temperature, saturated suction temperature, and ambient air temperature of the system; calculating the total heat rejected in a condenser of the system from values obtained in the preceding steps; calculating a heat transfer coefficient for the system; comparing the calculated heat transfer coefficient to an ideal heat transfer coefficient to obtain a value representing the operating condition of the condenser coil; and outputting a message to a user of the system based on the comparison of the calculated to ideal heat transfer coefficients.
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