Optimization of an overall heating capacity of an air conditioning system

Patent metadata

Field	Value
Publication number	US-9021820-B2
Application number	US-96836810-A
Country	US
Kind code	B2
Filing date	Dec 15, 2010
Priority date	Dec 17, 2009
Publication date	May 5, 2015
Grant date	May 5, 2015

Abstract

The invention relates to a control process for an air conditioning system. The air conditioning system comprises a thermal loop ( 1 ) used as a heat pump and an electrical heating device ( 2 ). The process calculates a global heating capacity (HCglo) in function of the temperature chosen by the passenger, the speed of the blower and the temperature of the exterior air. Then, the process calculates a heating capacity (HC 1 ) of the thermal loop ( 1 ) and compares this heating capacity (HC 1 ) of the thermal loop to the global heating capacity (HCglo). If the global heating capacity (HCglo) is superior to the heating capacity (HC 1 ) of the thermal loop, the process determines a heating capacity (HC 2 ) of the electrical heating device ( 2 ). This heating capacity (HC 2 ) of the electrical heating device ( 2 ) added to the heating capacity (HC 1 ) of the thermal loop ( 1 ) allows to obtain the global heating capacity (HCglo) required in function of the temperature selected by the passenger.

First claim

The invention claimed is:

1. A process for control of an air conditioning system including a heat loop ( 1 ) operating according to a heat pump mode, in which the heat loop ( 1 ) includes at least one external heat exchanger ( 10 ), an internal heat exchanger ( 11 ) or a water-air exchanger radiator ( 15 ), a compressor ( 12 ), an expansion device ( 9 ) and an evaporator ( 13 ), in which the heat loop ( 1 ) provides a heating capacity (HC 1 ) for the heat loop ( 1 ); the air conditioning system includes an electrical heating device ( 2 , 16 ) providing a complementary heating capacity (HC 2 , HC 16 ) and a control device ( 3 ) in which the process is implemented; the process includes the following steps:
receipt of a set point temperature,
determination of the air speed (VA) at the level of the external heat exchanger ( 10 ),
determination of the temperature of an air flow inside the air conditioning system (Tfa),
determination of the air flow rate (DmA) over the internal heat exchanger ( 11 ) or the water-air exchanger radiator ( 15 ),
calculation of an overall heating capacity (HCglo) on the basis of the temperature set point, the temperature of the air flow (Tfa) and the air flow rate over the internal heat exchanger ( 11 ),
determination of a heating capacity (HC 1 ) of the heat loop ( 1 ), comparison of the heating capacity (HC 1 ) of the heat loop ( 1 ) with the overall heating capacity (HCglo),
adjustment of the heating capacity (HC 2 , HC 16 ) of the electrical heating device ( 2 , 16 ) as a complement to the heating capacity (HC 1 ) of the heat loop (HC 1 ) if the heating capacity (HC 1 ) of the heat loop ( 1 ) is lower than the overall heating capacity (HCglo),
wherein the heating capacity (HC 1 ) of the heat loop ( 1 ) is limited to the heating capacity of the heat loop ( 1 ) cancelling the derivative with respect to this heating capacity (HC 1 ) of the heat loop ( 1 ) of the overall coefficient of performance (COPglo) if this derivative is cancelled for a heating capacity (HC 1 ) of the heat loop ( 1 ) below the overall capacity calculated (HCglo).

2. A process according to claim 1 , which includes a preliminary step of estimating two coefficients a and b of a linear approximation of the coefficient of performance of the heat loop (COP 1 ) as a function of the heating capacity (HC 1 ) of the heat loop ( 1 ), in which these coefficients are each estimated as a function of the components of the heat loop ( 1 ), for at least a plurality of air speeds (VA) in the external heat exchanger ( 10 ), a plurality of temperatures of the air flow (Tfa) and a plurality of mass air flow rates (DmA) in the internal heat exchanger ( 11 ), in which the process then includes, after the measurement steps, a step of determining, among the coefficients estimated, coefficients of the approximation of the coefficient of performance of the heat loop (COP 1 ) corresponding to the parameters measured, in which the heating capacity (HC 1 ) of the heat loop ( 1 ) is limited to (b 1/2 −b)/a.

3. A process according to claim 2 , in which the air conditioning system includes an air-water heat loop and has a complementary electrical water heating device ( 16 ), in which coefficients a and b are also estimated as a function of the overall required heating capacity (HCglo).

4. A process according to claim 1 , in which the air conditioning system is chosen from air conditioning systems including an air-air heat loop and equipped with an electrical air heating device ( 2 ), air conditioning systems including an air-water heat loop and equipped with an electrical air heating device ( 2 ), and air conditioning systems including an air-water heat loop and equipped with an electrical water heating device ( 16 ) with or without an electrical air heating device ( 2 ).

5. A process according to claim 1 , which includes a preliminary step of estimating two coefficients a and b of a linear approximation of the coefficient of performance of the heat loop (COP 1 ) as a function of the heating capacity (HC 1 ) of the heat loop ( 1 ), in which these coefficients are each estimated as a function of the components of the heat loop ( 1 ), for at least a plurality of air speeds (VA) in the external heat exchanger ( 10 ), a plurality of temperatures of the air flow (Tfa) and a plurality of mass air flow rates (DmA) in the internal heat exchanger ( 11 ), in which the process then includes, after the measurement steps, a step of determining, among the coefficients estimated, coefficients of the approximation of the coefficient of performance of the heat loop (COP 1 ) corresponding to the parameters measured, in which the heating capacity (HC 1 ) of the heat loop ( 1 ) is limited to (b 1/2 −b)/a.

6. A process according to claim 5 , in which the air conditioning system includes an air-water heat loop and has a complementary electrical water heating device ( 16 ), in which coefficients a and b are also estimated as a function of the overall required heating capacity (HCglo).

7. A process according to claim 1 , in which the air conditioning system is chosen from air conditioning systems including an air-air heat loop and equipped with an electrical air heating device ( 2 ), air conditioning systems including an air-water heat loop and equipped with an electrical air heating device ( 2 ), and air conditioning systems including an air-water heat loop and equipped with an electrical water heating device ( 16 ) with or without an electrical air heating device ( 2 ).

8. A process for control of an air conditioning system including a heat loop ( 1 ) operating according to a heat pump mode, in which the heat loop ( 1 ) includes at least one external heat exchanger ( 10 ), an internal heat exchanger ( 11 ) or a water-air exchanger radiator ( 15 ), a compressor ( 12 ), an expansion device ( 9 ) and an evaporator ( 13 ), in which the heat loop ( 1 ) provides a heating capacity (HC 1 ) for the heat loop ( 1 ); the air conditioning system includes an electrical heating device ( 2 , 16 ) providing a complementary heating capacity (HC 2 , HC 16 ) and a control device ( 3 ) in which the process is implemented; the process includes the following steps:
receipt of a set point temperature,
determination of the air speed (VA) at the level of the external heat exchanger ( 10 ),
determination of the temperature of an air flow inside the air conditioning system (Tfa),
determination of the air flow rate (DmA) over the internal heat exchanger ( 11 ) or the water-air exchanger radiator ( 15 ),
calculation of an overall heating capacity (HCglo) on the basis of the temperature set point, the temperature of the air flow (Tfa) and the air flow rate over the internal heat exchanger ( 11 ),
determination of a heating capacity (HC 1 ) of the heat loop ( 1 ),

comparison of the heating capacity (HC 1 ) of the heat loop ( 1 ) with the overall heating capacity (HCglo),
adjustment of the heating capacity (HC 2 , HC 16 ) of the electrical heating device ( 2 , 16 ) as a complement to the heating capacity (HC 1 ) of the heat loop (HC 1 ) if the heating capacity (HC 1 ) of the heat loop ( 1 ) is lower than the overall heating capacity (HCglo),
wherein a preliminary step of estimating two coefficients a and b of a linear approximation of the coefficient of performance of the heat loop (COP 1 ) as a function of the heating capacity (HC 1 ) of the heat loop ( 1 ), in which these coefficients are each estimated as a function of the components of the heat loop ( 1 ), for at least a plurality of air speeds (VA) in the external heat exchanger ( 10 ), a plurality of temperatures of the air flow (Tfa) and a plurality of mass air flow rates (DmA) in the internal heat exchanger ( 11 ), in which the process then includes, after the measurement step

Assignees

• Yahia Mohamed
• Nicolas Bertrand
• Hammi Samy
• Valeo Systemes Thermiques

Inventors

• Yahia Mohamed
• Nicolas Bertrand
• Hammi Samy

Classifications

• B60H2001/00949

  comprising additional heating/cooling sources, e.g. second evaporator · CPC title

• B60H1/00921 Primary

  where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct · CPC title

• B60H2001/00928

  comprising a secondary circuit · CPC title