Abstract:
Solar insolation models have been extensively reviewed for Quetta, Pakistan. The correlations
a/
suggestÿ by Klein are found suitable for global solar radiations at Quetta and that Quetta on an
average receives 763 Jo|les/nf/sec. Estimation of monthly daily diffuse radiation although found
quite reliable needs further investigations. We found reliable estimates for both global solar and
diffused solar radiations using sunshine hours. The 60 tilt surface of flat plate collector facing south
receives about 1.7 to 2.0 times the maximum irradiation on a surface with a tilt equal to latitude at
Quetta, especially in summer, whereas maximum solar energy round the year is received
for the same
tilt angle. The other tilt angles of a flat plate collector are also found suitable to intercept both global
and in particular, maximum diffuse solar radiations provided declination angles and solar trackings are
adjusted.
For thermal performance of building designs, the use of transparent insulation (Tl) at Quetta
particularly in a LEGIS south facade is recommended. Qur analysis on the use of a two-axis tracking
flat plate collector is found in agreement with estimates of solar radiations. We suggested
architectural design of buildings and residences at Quetta from view point of using both active and
passive solar heating/cooling systems and with environmental and climatic considerations.
We recommend installations of prototype solar heating and cooling systems for experimental
Verification of our estimated values of solar radiations and that the monitoring of their operational
modes is as essential as architectural designing of buildings itself. Duirnel variations of solar
radiations have a significant affect as heat transfer and thermal performance of building designs.
