Refrigeration – With indicator or tester – Condition sensing
Patent
1997-08-19
2000-10-10
Tanner, Harry B.
Refrigeration
With indicator or tester
Condition sensing
62127, F24B 4902
Patent
active
061289108
ABSTRACT:
An apparatus and method for noninvasively diagnosing a closed air refrigeration system includes a sensing unit which can be selectively placed over the evaporator inlet duct and the evaporator outlet duct to respectively measure the evaporator inlet enthalpy and the evaporator outlet enthalpy. Using both of these enthalpies, a computer calculates a sensible heat ratio for the evaporator which is useable to diagnose the system. Similarly, the sensing unit can be selectively placed over the condenser intake and condenser exhaust to measure the condenser intake enthalpy and the condenser exhaust enthalpy. Using these enthalpies, the computer calculates a sensible heat ratio for the condenser which is useable to further diagnose the system. Further, superheat and subcool set points can be calculated and compared with rated set points to evaluate the system. In an alternate embodiment, separate sensing units can be used simultaneously to measure the various enthalpies.
REFERENCES:
patent: 4510576 (1985-04-01), MacArthur et al.
patent: 4611470 (1986-09-01), Enstrom
patent: 4885914 (1989-12-01), Pearman
Chapter 5, "Psychrometrics" from the ASHRAE Handbook of Fundamentals, consisting of 5 pages.
Copy of psychometric chart by Trane and Directions for using the Trane Psychrometric Chart, 2 pages.
Basic part of final program of the fundamental computations, 2 pages.
Federal Air Conditioning Technologies, Inc.
Tanner Harry B.
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