Refrigerant radiator

摘要

A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant includes tubes through which the refrigerant flows. The tubes are stacked and arranged in a horizontal direction, and extend in a direction perpendicular to the horizontal direction or with an angle from the horizontal direction. The tubes include a first heat exchange area where refrigerant having a temperature equal to or higher than a standard temperature exchanges heat with first air blown to a space, and a second heat exchange area where refrigerant having a temperature lower than the standard temperature exchanges heat with second air blown to the space. Generally, the second air has a temperature different from a temperature of the first air.

主权项

1. A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant, and the refrigerant radiator being configured to radiate heat to air until gas-phase refrigerant discharged from the compressor changes at least to gas-liquid two-phase refrigerant, the refrigerant radiator comprising
a plurality of tubes through which the refrigerant flows, the tubes being stacked and arranged in a horizontal direction, and extending in a direction perpendicular to the horizontal direction or with an angle from the horizontal direction, wherein the tubes include a first heat exchange area where refrigerant having a temperature equal to or higher than a standard temperature exchanges heat with first air to be blown to a space, and a second heat exchange area where refrigerant having a temperature lower than the standard temperature exchanges heat with second air to be blown to the space, the second air generally having a temperature different from a temperature of the first air; a heat exchanging portion including the tubes is configured to radiate heat until gas-phase refrigerant discharged from the compressor changes to liquid-phase refrigerant, and the tubes are inclined with an inclination angle θ between a flow direction of refrigerant flowing in the tubes and the horizontal direction, and are configured to satisfy the following formula, when the inclination angle θ is in a range from 0 to 90 degrees,
Re≧A×X6+B×X5+C×X4+D×X3+E×X2+F×X+G whereA=−0.0537×θ2+9.7222×θ+407.19B=−(−0.2093×θ2+37.88×θ+1586.3)C=−0.3348×θ2+60.592×θ+2538.1D=−(−0.2848×θ2+51.53×θ+2158.2)E=−0.1402×θ2+25.365×θ+1062.8F=−(−0.0418×θ2+7.5557×θ+316.46)G=−0.0132×θ2+2.3807×θ+99.73 in which X is a dryness degree of refrigerant at a predetermined position of the tubes where gas-liquid two-phase refrigerant flows, and Re is a Reynolds number at the predetermined position, which is calculated based on an average flow velocity (m/s) of refrigerant flowing in the tubes.