Evaporator refrigeration system vehicle equipped with said system and method of evaporating refrigerant

Abstract

An evaporator using a CO2 refrigeration that prevents a raise in vapor quality of refrigeration in an evaporator passage to obtain heat exchanging efficiency. The evaporator for use in a refrigeration system includes a refrigerant inlet for introducing a refrigerant, a refrigerant outlet for discharging the refrigerant, and an evaporator passage for causing the refrigerant introduced via the refrigerant inlet to evaporate and leading the refrigerant to the refrigerant outlet. An intermediate outlet is provided at an intermediate portion of the evaporator passage. A refrigerant high in vapor quality among the refrigerant passing through the intermediate portion from the refrigerant inlet flows out of the intermediate outlet to prevent a raise in vapor quality of refrigerant.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is an application filed under 35 U.S.C. § 111(a) claiming the benefit pursuant to 35 U.S.C. § 119(e)(1) of the filing date of Provisional Application No. 60 / 478,303 filed on Jun. 16, 2003 pursuant to 35 U.S.C. § 111(b). [0002] Priority is claimed to Japanese Patent Application No. 2003-132044 filed on May 9, 2003, and U.S. Provisional Application No. 60 / 478,303 filed on Jun. 16, 2003, the disclosure of which are incorporated by reference in their entireties.TECHNICAL FIELD [0003] The present invention relates to a refrigeration system for use in a refrigeration cycle or the like using CO2 as a refrigerant. It also relates to an evaporator to be preferably used in the refrigeration system, a method of evaporating a refrigerant, and a vehicle equipped with the refrigeration system. BACKGROUND ART [0004] In a conventional vapor compression type refrigeration cycle, Freon series refrigerants are commonly used. In recent yea...

AI Technical Summary

Benefits of technology

[0023] In this invention, since the refrigerant high in vapor quality among the refrigerant which is being raised in vapor quality during the evaporation procedure flows out at the intermediate position of the evaporator passage, excessive raising in vapor quality of the refrigerant can be prevented during the evaporation procedure, enabling the heat exchanging of the refrigerant almost at the entire region of the evaporator passage in a state in which the vapor quality of the refrigerant is low. This prevents a deterioration of the coefficient of heat transfer, resulting in enhanced heat exchanging efficiency and heat exchanging performance.

[0039] In this invention, in the similar manner as in the above case, effective heat exchanging can be attained almost at the entire region of the evaporator passage in a state in which the vapor quality of refrigerant is low.

[0044] In the invention, in cases where the structure as recited in the aforementioned Item 6 is employed, the refrigerant can be circulated smoothly.

[0054] In this invention, since the gas phase component of the refrigerant high in vapor quality among the refrigerant which is being raised in vapor quality during the evaporation procedure flows out of the intermediate position of the evaporator passage, excessive raising in vapor quality of the refrigerant can be prevented during the evaporation procedure, enabling the heat exchanging of the refrigerant almost at the entire region of the evaporator passage in a state in which the vapor quality of the refrigerant is low. This prevents a deterioration of the coefficient of heat transfer, resulting in enhanced heat exchanging efficiency and heat exchanging performance.

[0072] In the invention, in cases where the structure as recited in the aforementioned Item 12 is employed, the gas phase refrigerant can be extracted assuredly at the intermediate portion of the evaporator passage, further improving the heat exchanging efficient.

Problems solved by technology

To the contrary, in the case in which vapor quality of refrigerant is higher than a predetermined value (a range of 0.4 to 0.6), the coefficient of evaporation heat transfer becomes extremely low, resulting in extremely decreased heat exchanging efficiency.

However, in the latter half thereof, the vapor quality of refrigerant becomes higher than the predetermined value, and therefore the heat exchanging rate extremely drops, which may cause a deterioration of the heat exchange performance.

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