radiant efficiency


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radiant efficiency

[′rād·ē·ənt i′fish·ən·sē]
(optics)
The ratio of the radiant flux emitted by a radiation source to the power consumed by the source.
References in periodicals archive ?
Diabetic MBL (n = 6) PBS (n = 6) In vivo 1.5 x [10.sup.7] 6.8 x [10.sup.6] (9.9 x [10.sup.6]- (4.5 x [10.sup.6]- 1.9 x [10.sup.7]) 8.5 x [10.sup.6]) Ex vivo 2.4 x [10.sup.10] 8.2 x [10.sup.9] (kidney) (2.0 x [10.sup.10]- (2.4 x [10.sup.9]- 2.8 x [10.sup.10]) 1.4 x [10.sup.10]) Control Two-way MBL (n = 6) PBS (n = 6) ANOVA * In vivo 5.8 x [10.sup.6] 5.9 x [10.sup.6] p = 0.0021 (3.2 x [10.sup.6]- (4.0 x [10.sup.6]- 8.4 x [10.sup.6]) 7.4 x [10.sup.6]) Ex vivo 2,6 x [10.sup.9] 4.3 x [10.sup.9] p < 0.0001 (kidney) (8.0 x [10.sup.8]- (1.2 x [10.sup.9]- 4.3 x [10.sup.9]) 9.8 x [10.sup.9]) Values are given in mean radiant efficiency with 95% confidence intervals.
The silicon carbide heater operates at about 1250 F with a radiant efficiency of 65-70%, lower than the 1700 F operating temperature and nearly 80% efficiency of a quartz panel.
The greater radiant efficiency of the U-shaped tubes provides the needed radiant energy to warm the floor.
Other features are said to include calorized steel emitter tubes for higher radiant efficiency and safety, a state-of-the-art step opening combustion gas valve for quieter ignition, and a closed combustion chamber design and direct spark ignition system with 100% safety shut-off control.
Among features highlighted are the heater's pull-through system and self-contained draft inducer for increased radiant efficiency and safety; the rugged one-piece cast iron burner system and spark ignition system with 100% gas shut-off safety control; the large diameter, heat treated calorized radiant emitter tube system; and numerous other features such as monitoring lights for on-line diagnosis and simple, easy maintenance.
The LTU130 u-tube heaters, rated at up to 130,000 btu/hr, each, feature a self-contained draft inducer, which pulls the products of combustion through the combustion chamber for increased radiant efficiency and safety, according to the company.