A comparison between calculated and measured SHGC for complex fenestration systems

Conference · Fri Sep 01 04:00:00 EDT 1995

OSTI ID:213886

Klems, J H; Warner, J L; Kelley, G O

Calorimetric measurements of dynamic net heat flow through a complex fenestration system consisting of a buff venetian blind inside clear double glazing are used to derive the direction-dependent beam SHGC (solar heat gain coefficient) of the fenestration. The data are compared with calculations according to a proposed general method for deriving complex fenestration system SHGC`s from bidirectional layer optical properties and generic calorimetric properties. Previously published optical data for the same venetian blind and generic inward-flowing fraction measurements are used in the calculation. Satisfactory agreement is found between SHGC measurements and calculation. Significant dependence on incident angle was found in the measured SHGC`s. Profile angle was not found to be a useful variable in characterizing the system performance. Predicted SHGC was found to be inherently dependent on two angles, although only the incident angle variations were observable under test conditions.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States); USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 213886
• Report Number(s): LBL--37037; Mo--345; CONF-960254--3; ON: DE96008575; CNN: Research Project 548-RP (Agreement BG 87-127)
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
DOUBLE GLAZING
SCREENS
SHADING
SOLAR FLUX
SOLAR HEATING
WINDOWS