초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for noninvasively diagnosing a closed air refrigeration system, the system having an evaporator with an inlet and an outlet and a condenser with an intake and an exhaust, the apparatus comprising:a sensor means for measuring enthalpy components, wherein said

[ What is claimed is:] [1.] An apparatus for noninvasively diagnosing a closed air refrigeration system, the system having an evaporator with an inlet and an outlet and a condenser with an intake and an exhaust, the apparatus comprising:a sensor means for measuring enthalpy components, wherein said enthalpy components include dry bulb temperature and relative humidity;a computer means electrically connected with said sensor means for calculating an inlet enthalpy from the measured components when said sensor means is placed near said evaporator inlet, and calculating an outlet enthalpy from the measured components when said sensor is placed near said evaporator outlet, and comparing said inlet enthalpy with said outlet enthalpy to determine a total heat transfer (Q.sub.TOT) for use in diagnosing said refrigeration system.