VEHICLE AIR CONDITIONING UNIT WITH HEAT EXCHANGER ARRANGED IN SUCTION SIDE

Abstract

A vehicle climate control unit with an evaporator, a heating heat exchanger as well as a blower, characterized in that, in the direction of the air flow, are disposed, upstream of the blower on the suction side, the evaporator and the heating heat exchanger, and that an additional heating heat exchanger is disposed downstream of the blower on the pressure side.

Claims

1. A vehicle climate control unit with an evaporator, a heating heat exchanger as well as a blower, characterized in that, in the direction of the air flow, the evaporator and the heating heat exchanger are disposed upstream of the blower on the suction side and that an additional heating heat exchanger is disposed downstream of the blower on the pressure side.

2. The vehicle climate control unit according to claim 1, wherein a heating heat exchanger for heating the air is provided which comprises a preheat zone and a reheat zone opposing in flow in relation to the disposition of the zones to the blower.

3. The vehicle climate control unit according to claim 1, wherein the heating heat exchanger preheat zone and the evaporator are disposed in parallel in the climate control system inflow.

4. The vehicle climate control unit according to claim 1, wherein the heating heat exchanger preheat zone and the evaporator are connected in series in the climate control system inflow.

5. The vehicle climate control unit according to claim 1, wherein a main temperature louver is disposed between the evaporator and the heating heat exchanger preheat zone, wherein the main temperature louver controls the ratio of heated to cooled air.

6. The vehicle climate control unit according to claim 1, wherein a secondary temperature louver is disposed in the reheat flow, wherein the secondary temperature louver controls the ratio of bypass and throughflow of the heating heat exchanger reheat zone.

7. The vehicle climate control unit as in claim 6, wherein the secondary temperature louver is mechanically coupled with the main temperature louver and is implemented such that it is drivable thereacross.

8. The vehicle climate control unit as in claim 6, wherein the secondary temperature louver is implemented with a separate drive.

9. The vehicle climate control unit according to claim 1, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

10. The vehicle climate control unit according to claim 2, wherein the heating heat exchanger preheat zone and the evaporator are disposed in parallel in the climate control system inflow.

11. The vehicle climate control unit according to claim 2, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

12. The vehicle climate control unit according to claim 3, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

13. The vehicle climate control unit according to claim 4, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

14. The vehicle climate control unit according to claim 5, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

15. The vehicle climate control unit according to claim 6, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

16. The vehicle climate control unit according to claim 7, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

17. The vehicle climate control unit according to claim 8, wherein several air outlets are provided on the pressure side of the blower, wherein at least one air outlet is provided for a mixed air flow without reheating, and at least one air outlet is provided for a reheat flow with reheating.

18. The vehicle climate control unit according to claim 2, wherein a main temperature louver is disposed between the evaporator and the heating heat exchanger preheat zone, wherein the main temperature louver controls the ratio of heated to cooled air.

19. The vehicle climate control unit according to claim 3, wherein a main temperature louver is disposed between the evaporator and the heating heat exchanger preheat zone, wherein the main temperature louver controls the ratio of heated to cooled air.

20. The vehicle climate control unit according to claim 4, wherein a main temperature louver is disposed between the evaporator and the heating heat exchanger preheat zone, wherein the main temperature louver controls the ratio of heated to cooled air.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0028] FIG. 1: schematic diagram of a cross section of the vehicle climate control unit with adjustable temperature stratification function and

[0029] FIG. 2: diagram to represent the temperature spread through reheating with a vehicle climate control unit of the construction type according to FIG. 1.

DETAILED DESCRIPTION

[0030] In FIG. 1 is depicted an implementation of a vehicle climate control unit 1 in which the suction-side disposition of the heat exchangers is realized. The vehicle climate control unit 1 comprises, firstly, an evaporator 2 and a heating heat exchanger with a preheat zone 3, The two heat exchangers are located at the suction side with respect to a blower 4, across which the climate control inflow 10 is suctioned into the vehicle climate control unit 1. The air of the climate control inflow 10 in the depicted implementation flows in parallel through the evaporator 2 and the preheat zone 3 of the heating heat exchanger. Between the two heat exchangers 2, 3 and the blower 4 is disposed a main temperature louver 5 that controls the ratio of the air volume flows as a function of the louver position.

[0031] The complete heating of the air flowing toward the blower 4 as well as also the complete cooling of the air flowing toward the blower 4 as well as also proportional mixing of cooled and heated air flowing toward the blower 4 can thereby be adjusted by means of the louver position of the main temperature louver 5.

[0032] After it has been tempered, the air flow, which at this point is optionally comprised of different components, is now mixed in the blower 4, whereupon a mixed flow 11 leaves the blower 4. The exiting mixed air flow 11 in the depicted embodiment is conducted together with a subflow out of the air outlet 7 with outlet damper. The air outlet 7 is also termed dashboard vent, A further subflow of the mixed air flow 11 is routed to the air outlet 8 in the footwell where it is intended to flow out. On the path to the air outlet 8, this subflow of the mixed air flow 11 passes through a secondary temperature louver 6 which is disposed in the region of the reheat zone 9 of the heating heat exchanger. In a louver position set for bypass the particular mixed air flow 11 is routed past the reheat zone 9 of the heating heat exchanger without being reheated to the air outlet 8 in the footwell. In the opposite louver position the entire mixed air flow 11 is routed across the reheat zone 9 of the heating heat exchanger, whereby reheating is carried out before the subsequently heated mixed air flow 11 leaves the vehicle climate control unit 1 as reheat flow 12 across the air outlet 8 in the footwell.

[0033] FIG. 2 represents a depiction of the outlet temperature T of the air at the air outlets dashboard vent 7 and footwell 8 on the ordinate or Y-axis over the different louver positions from cold to hot on the abscissa or X-axis of the system of coordinates.

[0034] The linear function course indicates with cross marks the temperature of the outflowing air as a function of the louver position of the main temperature louver 5 for the mixed air flow 11. If the secondary temperature louver 6 is moved to bypass position, the air leaving the air outlet 8 in the footwell corresponds to the temperature profile of the mixed air flow 11. If the secondary temperature louver 6 is moved out of the bypass position to the opposite position, the reheat flow 12 is heated and a temperature spread results and entailed therein a temperature stratification at the air outlet 8 in the footwell, depicted in the curve profile with dot markings and the curve profile indicated in dashed line.

LIST OF REFERENCE NUMBERS

[0035] 1 Vehicle climate control unit [0036] 2 Evaporator [0037] 3 Heating heat exchanger preheat zone [0038] 4 Blower [0039] 5 Main temperature louver [0040] 6 Secondary temperature louver [0041] 7 Air outlet dashboard vent with outlet damper [0042] 8 Air outlet footwell with outlet damper [0043] 9 Heating heat exchanger reheat zone [0044] 10 Climate control system inflow [0045] 11 Mixed air flow [0046] 12 Reheat flow