Refrigeration system, compressing and heat-releasing apparatus and heat-releasing device

A refrigeration system, comprising:

• a primary compressing portion that primarily compresses a refrigerant;
• a secondary compressing portion that secondarily compresses the refrigerant;
• a primary heat-releasing portion that primarily performs heat-releasing of the refrigerant;
• a secondary heat-releasing portion that secondarily performs heat-releasing of the refrigerant;
• a decompressing device that decompresses the refrigerant;
• and a cooling device that cools a medium to be cooled by absorbing heat from the medium,
• wherein the refrigerant primarily compressed by the primary
• compressing portion is primarily released in heat by the primary heat-releasing portion, the primarily heat-released refrigerant is secondarily compressed by the secondary compressing portion, the secondarily compressed refrigerant is secondarily released in heat by the secondary heat-releasing portion and then passes through the cooling device to absorb heat from the medium, and then returns to the primary compressing portion.

A heat-releasing device provided with a primary heat-releasing portion for primarily releasing heat of a primarily compressed refrigerant and a secondary heat-releasing portion for secondary releasing heat of a secondarily compressed refrigerant after being primarily released in heat, the heat-releasing device comprising:

• a pair of headers;
• and
• a plurality of heat exchanging tubes disposed between the pair of headers arranged in parallel with each other in a longitudinal direction of the header with opposite ends thereof being connected to the headers;
• wherein a refrigerant passing through the plurality of heat exchanging tubes exchanges heat with cooling air introduced from a front side of the heat-releasing device and passing through a gap between adjacent heat exchanging tubes to be released in heat,
• wherein each of the headers is divided by a partitioning member at a same height position to thereby classify the plurality of heat exchanging tubes into upper and lower heat exchanging tube groups, one of the heat exchanging tube group constituting the primary heat-releasing portion and the other thereof constituting the secondary heat-releasing portion.

A heat-releasing device provided with a primary heat-releasing portion for primarily releasing heat of a primarily compressed refrigerant and a secondary heat-releasing portion for secondarily releasing heat of a secondarily compressed refrigerant after being primarily released in heat, the heat-releasing device comprising:

• a pair of headers;
• and
• a plurality of heat exchanging tubes disposed between the pair of headers arranged in parallel with each other in a longitudinal direction of the header with opposite ends thereof being connected to the headers;
• wherein a refrigerant passing through the plurality of heat exchanging tubes exchanges heat with cooling air introduced from a front side of the heat-releasing device and passing through a gap between adjacent heat exchanging tubes to be released in heat,
• wherein each of the heat exchanging tubes is provided with a plurality of refrigerant passages arranged in a tube widthwise direction,
• wherein each of the pair of headers is divided by a partitioning member extending in a longitudinal direction of the header into a front space and a rear space, whereby the plurality of refrigerant passages of each heat exchanging tube is classified into a front refrigerant passage group and a rear refrigerant passage group, one of the refrigerant passage groups constituting the primary heat-releasing portion and the other thereof constituting the secondary heat-releasing portion.