Detection of refrigerant charge adequacy based on multiple temperature measurements
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-045/00
출원번호
US-0294183
(2005-12-05)
등록번호
US-7386985
(2008-06-17)
발명자
/ 주소
Concha,Julio I.
Braun,Robert J.
Gopalnarayanan,Sivakumar
Schuster,Don A.
Das,Sathish R.
출원인 / 주소
Carrier Corporation
대리인 / 주소
Marjama Muldoon Blasiak & Sullivan LLP
인용정보
피인용 횟수 :
12인용 특허 :
2
초록▼
The refrigerant charge adequacy of an air conditioning system is determined by the sensing of two temperatures in the system, one being at a midpoint in a condenser coil and the other being the temperature in the liquid line of the condenser discharge, with the difference then being indicative of th
The refrigerant charge adequacy of an air conditioning system is determined by the sensing of two temperatures in the system, one being at a midpoint in a condenser coil and the other being the temperature in the liquid line of the condenser discharge, with the difference then being indicative of the degree of subcooling, which, in turn, may be indicative of refrigerant charge condition. The method is refined by measuring a third temperature at the compressor discharge, with the three temperature values then being used to calculate a pair of residual values which provide an indication of whether the two temperature approach is useful in determining charge adequacy under the existing conditions and if not, whether the system is overcharged or undercharged.
대표청구항▼
We claim: 1. A method of determining the adequacy of refrigerant charge in an air conditioning system having a refrigerant flowing serially through a compressor, a condenser, an expansion device and an evaporator, comprising the steps of: sensing the temperature of the refrigerant at an intermediat
We claim: 1. A method of determining the adequacy of refrigerant charge in an air conditioning system having a refrigerant flowing serially through a compressor, a condenser, an expansion device and an evaporator, comprising the steps of: sensing the temperature of the refrigerant at an intermediate point in said condenser to obtain a first temperature; sensing the temperature of the refrigerant at a discharge end of said condenser to obtain a second temperature; calculating the difference between said first and second temperatures to obtain a coil temperature difference; comparing said coil temperature difference with predetermined values to determine the refrigerant charge adequacy of the system sensing the temperature at the discharge of the compressor to obtain a third temperature; and using said third temperature to validate the determination of charge adequacy by calculating a first residual value R1 using said first, second and third temperatures; and on the basis of the residual value R1 determining whether the refrigerant charge is at neither a significantly high nor a significantly low level and therefore useful for the two-temperature method of determining charge adequacy, or whether the refrigerant charge level is significantly high or whether the level of refrigerant charge is significantly low. 2. A method as set forth in claim 1 wherein the step of calculating the coil temperature differences is accomplished by way of a comparator. 3. A method as set forth in claim 1, and including the additional steps of: calculating a second residual value R2 using said first, second and third temperatures; and on the basis of the residual values R1 and R2 determining whether the refrigerant charge is at neither a significantly high nor a significantly low level and therefore useful for the two temperature method of determining charge adequacy, or whether the refrigerant charge level is significantly high or whether the level of refrigerant charge is significantly low. 4. A method as set forth in claim 1, in which the coefficients required to compute residual R1 are determined from experimental data using a support vector classifier. 5. A method as set forth in claim 3 wherein, if the residual value R1 is on one side of a predefined R1 threshold, then the determination is made that the refrigerant charge level is at neither a significantly high nor significantly low level. 6. A method as set forth in claim 5 wherein, when said first residual R1 is on the other side of a predefined R1 threshold and said second residual R2 is on a certain side of another predefined R2 threshold, a determination is made that the refrigerant charge level is significantly higher than normal. 7. A method as set forth in claim 5 wherein, when said residual R1 is on the other side of a predefined R1 threshold and said residual R2 is on the other side of a predefined R2 threshold, a determination is made that the refrigerant charge level is significantly lower than normal. 8. A method as set forth in claim 1 wherein the residual R1 is computed according to the equation description="In-line Formulae" end="lead"R1 =a*T C +b*T LL +c*T CD +d*T GD2+edescription="In-line Formulae" end="tail" where: T_C is the temperature at the condenser, T_LL is the temperature at the liquid line, T_CD is the temperature at the compressor discharge, a, b, c, d, e are constant numbers. 9. A method as set forth in claim 3 wherein the second residual R2 is computed according to the equation description="In-line Formulae" end="lead"R2=f*T--C+g*T-- LL+h*T--CD+i*T--CD2+j description="In-line Formulae" end="tail" where f, g, h, i and j are constant numbers such that R2 1 2 1 <0 and the refrigerant at an intermediate point in said condenser is superheated gas.
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이 특허에 인용된 특허 (2)
Bessler Warren F. (Schenectady NY), Low refrigerant charge detection using a combined pressure/temperature sensor.
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