Condenser and air conditioning refrigeration system and using same

A condenser, comprising:

• a refrigerant inlet;
• a refrigerant outlet;
• and
• a heat exchanging core including one or a plurality of heat exchanging tubes which connect said refrigerant inlet and said refrigerant outlet in fluid communication,
• wherein said heat exchanging core includes:
• a condensing portion for condensing at least a part of a high-pressure and high-temperature gaseous refrigerant introduced through said refrigerant inlet into a liquified refrigerant by exchanging heat between the gaseous refrigerant and ambient air;
• a decompressing evaporation portion having a cross-sectional area smaller than a cross-sectional area of said condensing portion, wherein said decompressing evaporation portion decompresses the liquified refrigerant liquified at said condensing portion to evaporate at least a part of the liquified refrigerant into a gaseous refrigerant;
• and
• a re-condensing portion having a cross-sectional area larger than a cross-sectional area of said condensing portion, whereby the gaseous refrigerant decompressed and evaporated at said decompressing evaporation portion is exchanged heat between the gaseous refrigerant and ambient air to be re-condensed.

A refrigeration system for use in an air conditioner which constitutes a refrigeration cycle in which refrigerant is sealed, comprising:

• a compressor;
• a condenser;
• a decompressing member;
• and
• an evaporator,
• wherein said condenser includes:
• a refrigerant inlet for introducing refrigerant sent from said compressor into said condenser;
• a refrigerant outlet for sending the refrigerant from said condenser to said decompression member;
• a heat exchanging portion having a refrigerant passage for introducing the refrigerant to said refrigerant outlet while condensing the refrigerant introduced from said refrigerant inlet;
• and
• a decompressing portion provided at a part of said refrigerant passage for decompressing a refrigerant pressure,
• wherein said heat exchanging portion includes a pair of parallel headers disposed at a certain distance, a plurality of heat exchanging tubes with opposite ends connected to said headers in fluid communication and at least on partitioning member provided at at least one of said headers to divide said plurality of heat exchanging tubes into a plurality of heat exchanging passes, whereby the refrigerant passes through each of said passes in turn,
• wherein said plurality of passes include a first pass connected to said refrigerant inlet and a final pass connected to said refrigerant outlet,
• wherein said decompressing portion is provided at a part of said refrigerant passage between said first and said final pass,
• wherein said decompressing portion has a passage cross-sectional area smaller than a cross-sectional area of said refrigerant passage adjacent to said decompressing portion at an upstream side of said decompressing portion and that of said refrigerant passage adjacent to said decompressing portion at a downstream side of said decompressing portion,
• wherein said refrigerant passage located at an upstream side of said decompressing means condenses at least a part of a high-pressure gaseous refrigerant compressed by said compressor by exchanging heat between the high-pressure gaseous refrigerant and ambient air into a liquified refrigerant,
• wherein said decompressing portion decompresses the liquified refrigerant into a low-pressure gaseous refrigerant, and
• wherein said refrigerant passage located at a downstream side of said decompressing means re-condenses the low-pressure gaseous refrigerant by exchanging heat between the low-pressure gaseous refrigerant and ambient air.