# US 6,718,791 B2 · Heat pump air conditioning system for vehicles

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- Number: US 6,718,791 B2
- Document ID: US6718791B2
- Status: Granted
- Kind: B2
- Application number: 10/421,536
- Filed: 2003-04-23
- Published: 2003-11-13
- Granted: 2004-04-13
- Earliest claimed: 2002-05-09
- Assignees: Honda Giken Kogyo Kabushiki Kaisha
- Inventors: Choji Sakuma
- Web page: https://patentgrep.com/patent/US6718791B2

## CPC

- F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02)
- B60H 1/00899: {Controlling the flow of liquid in a heat pump system (controlling the properties of the refrigerant liquid, e.g. pressure or temperature, B60H1/3204)}
- B60H 2001/00949: {comprising additional heating/cooling sources, e.g. second evaporator}
- F25B 2313/02521: during cooling
- F25B 2313/02523: during heating
- F25B 2500/31: Low ambient temperatures
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES

## Abstract

A heat pump air conditioning system having an outside heat exchanger which is disposed in an engine compartment of a vehicle is provided. The outside heat exchanger consists of a first outside heat exchanger disposed forward of an engine and a second outside heat exchanger disposed near the engine except the front, especially rearward of the engine. When heating the passenger compartment, the second outside heat exchanger acts as a heat absorber, utilizing the heat of the engine, and effectively heating the interior.

## Claims

### Claim 1

A heat pump air conditioning system for heating and cooling the passenger compartment of a vehicle, said system comprising:
an inside heat exchanger disposed in said passenger compartment;
an outside heat exchanger disposed in an engine compartment;
refrigerant passages connecting said inside heat exchanger and said outside heat exchanger and charged with a refrigerant; and
a compressor for compressing a refrigerant gas in said refrigerant passages;
said outside heat exchanger comprising:
a first outside heat exchanger disposed forward of an engine in said engine compartment to act as a heat radiator in cooling; and
a second outside heat exchanger disposed in the vicinity of said engine in said engine compartment to act as a heat absorber in heating, utilizing the heat of said engine.

### Claim 2 (depends on 1)

An air conditioning system as set forth in claim 1, wherein said second outside heat exchanger is provided with a fan for guiding air within said engine compartment thereto.