디씨에스입니다. 문의하신 ASHRAE 2005 Handbook of Fundamental, Chapter 30, 4Page의 내용입니다. Return Air Light Fixtures Two generic types of return air light fixture are available: those that allow and those that do not allow return air to flow through the lamp chamber. The first type is sometimes called a heat-of-light fixture. The percentage of light heat released through the plenum side of various ventilated fixtures can be obtained from lighting fixture manufacturers. For representative data, see Nevins et al. (1971). Even unventilated fixtures lose some heat to plenum spaces; however, most of the heat ultimately enters the conditioned space from a dead-air plenum or is picked up by return air via ceiling return air openings. The percentage of heat to return air ranges from 40 to 60% for heat-to-return ventilated fixtures, or 15 to 25% for unventilated fixtures. :::: 원승환의 글 ::::
rts-sarek 사용중입니다. lighting of RA 기준참조위치(ASHRAE 2005 HoF p30.4) 의 정확한 위치가 필요합니다. | 
