Heat pump cycle device

Abstract

A heat pump cycle device includes a compressor for drawing and compressing refrigerant, a first high-pressure heat exchanger located for heating a first fluid circulating in a first fluid circuit using high-pressure refrigerant discharged from the compressor, a second high-pressure heat exchanger for heating a second fluid circulating in a second fluid circuit using the high-pressure refrigerant flowing out of the first high-pressure heat exchanger, a first heating heat exchanger located to heat a third fluid using the first fluid, a second heating heat exchanger located to heat the third fluid using the second fluid, a decompression unit located to decompress the high-pressure refrigerant flowing out of the second high-pressure heat exchanger, and a low-pressure heat exchanger for evaporating low-pressure refrigerant decompressed by the decompression unit. Because the first and second high-pressure heat exchangers are located, cycle efficiency can be improved.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is based on Japanese Patent Application No. 2006-106788 filed on Apr. 7, 2006, the contents of which are incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a heat pump cycle device in which heat is transported from a low-temperature side to a high-temperature side. [0004] 2. Description of the Related Art [0005] U.S. Pat. No. 6,574,977 B2 (corresponding to JP-A-2002-98430) describes a heat pump cycle device that includes a first high-pressure heat exchanger in which high-pressure refrigerant is heat-exchanged with a first fluid, and a second high-pressure heat exchanger in which high-pressure refrigerant flowing out of the first high-pressure heat exchanger is heat-exchanged with a second fluid having a temperature lower than that of the first fluid. Accordingly, a heat quantity obtained from the heat pump cycle device is ...

AI Technical Summary

Benefits of technology

[0007] In view of the foregoing problems, it is a first object of the present invention to provide a heat pump cycle device which can effectively improve cycle efficiency.

[0008] It is another object of the present invention to provide a heat pump cycle device used for an air conditioner, which effectively improve cycle efficiency.

[0009] It is another object of the present invention to provided a vehicle air conditioner with a heat plump cycle device, which can improve cycle efficiency while preventing a fog on a windshield of the vehicle.

[0010] According to an aspect of the present invention, a heat pump cycle device includes: a compressor for drawing and compressing refrigerant; a first high-pressure heat exchanger located to heat a first fluid circulating in a first fluid circuit, using high-pressure refrigerant discharged from the compressor; a second high-pressure heat exchanger located to heat a second fluid circulating in a second fluid circuit, using the high-pressure refrigerant flowing out of the first high-pressure heat exchanger; a first heating heat exchanger located to heat a third fluid using the first fluid; a second heating heat exchanger located to heat the third fluid using the second fluid; a decompression unit located to decompress the high-pressure refrigerant flowing out of the second high-pressure heat exchanger; and a low-pressure heat exchanger which is located to evaporate low-pressure refrigerant decompressed by the decompression unit. Accordingly, efficiency of refrigerant cycle can be improved using the first and second high-pressure heat exchangers and the first and second heating heat exchangers.

[0011] Furthermore, because the first and second heating heat exchanger are constructed separately from the low-pressure heat exchanger used as a cooling heat exchanger, the low-pressure heat exchanger is not switched to be operated as a refrigerant radiator. Therefore, it can prevent a windshield from being fogged due to the evaporation of condensed water on the low-pressure heat exchanger during a heating operation mode when the heat pump cycle device is used for an air conditioner.

Problems solved by technology

However, because the interior heat exchanger is used for both the evaporator and the refrigerant radiator, condensed water generated on the interior heat exchanger during the cooling operation mode or a dehumidifying operation mode is heated and evaporated in the heating operation mode, and is blown into the vehicle compartment together with air, thereby easily causing fog on a windshield of the vehicle.

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