4. Data for a flat-plate collector used for heating are given below: Factor Specification Location and latitude Coimbatore 11° 00’ N Day and time 22 March, 14.30 — 15.30 (LST) Average intensity of solar radiaton ...560 W/m? Collector tilt ...26° No. of glass cover B Heat removal factor for collector ...0.82 Transmittance of glass ...0.88 Absorptance of the plate ...0.93 Top loss coefficient (U,) for collector ...7.95 W/m?°C Collector fluid temperature ...75°C Ambient tempeature ...25°C Calculate: (i) Solar attitude angle, (ii) Incident angle, and (iii) Collector efficiency. [Ans. 43.9°, 46.1°, 8.87%]
4. Data for a flat-plate collector used for heating are given below: Factor Specification Location and latitude Coimbatore 11° 00’ N Day and time 22 March, 14.30 — 15.30 (LST) Average intensity of solar radiaton ...560 W/m? Collector tilt ...26° No. of glass cover B Heat removal factor for collector ...0.82 Transmittance of glass ...0.88 Absorptance of the plate ...0.93 Top loss coefficient (U,) for collector ...7.95 W/m?°C Collector fluid temperature ...75°C Ambient tempeature ...25°C Calculate: (i) Solar attitude angle, (ii) Incident angle, and (iii) Collector efficiency. [Ans. 43.9°, 46.1°, 8.87%]
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.54P
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4. Data for a flat-plate collector used for heating are given below: Factor Specification Location and latitude Coimbatore 11° 00’ N Day and time 22 March, 14.30 — 15.30 (LST) Average intensity of solar radiaton ...560 W/m? Collector tilt ...26° No. of glass cover B Heat removal factor for collector ...0.82 Transmittance of glass ...0.88 Absorptance of the plate ...0.93 Top loss coefficient (U,) for collector ...7.95 W/m?°C Collector fluid temperature ...75°C Ambient tempeature ...25°C Calculate: (i) Solar attitude angle, (ii) Incident angle, and (iii) Collector efficiency. [Ans. 43.9°, 46.1°, 8.87%]
Transcribed Image Text:4. Data for a flat-plate collector used for heating are given below:
Factor
Specification
Location and latitude
Coimbatore 11° 00' N
Day and time
Average intensity of solar radiaton
22 March, 14.30 – 15.30 (LST)
...560 W/m2
Collector tilt
...26°
No. of glass cover
...2
Heat removal factor for collector
...0.82
Transmittance of glass
Absorptance of the plate
Top loss coefficient (U,) for collector
Collector fluid temperature
...0.88
...0.93
...7.95 W/m2°C
..75°C
Ambient tempeature
...25°C
Calculate:
(i) Solar attitude angle,
(iii) Collector efficiency.
(ii) Incident angle, and
[Ans. 43.9°, 46.1°, 8.87%)
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