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US 6,272,868 B1Granted
Method and apparatus for indicating condenser coil performance on air-cooled chillers
AssigneeCarrier Corporation
InventorsMichel Karol Grabon, Wahl Said
Life of this patent
Estimating the term…
Abstract
An algorithm calculates, in real time, the overall heat transfer coefficient for an air-cooled chiller system and compares this value to a reference value corresponding to a new machine operating with a clean condenser. Based on this comparison, an indication is displayed to inform a user of the degree of degradation in condenser performance.
Claims6
A method for determining an operating condition of a condenser coil of a refrigeration system, comprising the steps of:
- a) checking to see if said system is in a steady operating state;
- b) determining a saturated condensing temperature of said system;
- c) determining a saturated suction temperature of said system;
- d) determining an ambient air temperature of said system;
- e) calculating a total heat rejected in a condenser of said system from values obtained in steps (b), (c), and (d);
- f) calculating a heat transfer coefficient from values obtained in steps (b), (d), and (e);
- g) comparing said calculated heat transfer coefficient to an ideal heat transfer coefficient to obtain a value representing said operating condition of said condenser coil;
- and
- h) outputting a message to a user of said system based on said value obtained in step (g).
6 more elements
An apparatus for determining an operating condition of a condenser coil of a refrigeration system, comprising:
- means for checking to see if said system is in a steady operating state;
- means for determining a saturated condensing temperature, a saturated suction temperature, and an ambient air temperature of said system;
- means for calculating a total heat rejected in a condenser of said system from said saturated condensing temperature, said saturated suction temperature, and said ambient air temperature;
- means for calculating a heat transfer coefficient from said saturated condensing temperature, said ambient air temperature, and said total heat rejected;
- means for comparing said calculated heat transfer coefficient to an ideal heat transfer coefficient to obtain a value representing said operating condition of said condenser coil;
- and
- means for outputting a message to a user of said system based on said value.
4 more elements
Dependencies are inferred from the claim text.