Abstract:
Rising costs of conventional fuels, increasing energy demand, concerns over
climate change and pollutants resulted from burning fossil fuels have
increased the interest in various renewable energy technologies. The energy
demand associated with heated air for different sectors is quite significant.
Solar air heaters have been developed with the aim of reducing the demand
for conventional fuels. This Thesis presents design and technical evaluation
of solar air heating system on a small residential building in Bangladesh for
winter air conditioning. It is estimated that for heating of 3m x 3m x 3.5m of
room, a collector of 1.5m2 is needed with proper insulation of 2 inch thick
Fiber glass. For the surface coating (generally black) on a mild steel sheet a
selective coating system is suggested. For the distribution of air in the
conditioned space a blower of Pressure 55mm (water), 1400 RPM,
Frequency 50Hz, air velocity of 12 m/s and air capacity of .4 m3/s is used. A
double glazing system is used to minimize the heat losses from the collector
plate, which occur due to convection and radiation. The experimental work
was performed beside the middle workshop, Mechanical Engineering
Department, Islamic University of Technology under Gazipur prevailing
weather conditions during the summer months August and September. Data
were collected on half an hour interval from 9.00 am to 5.00 pm. As the
ground was flat, the collector was proposed to be tilted with 23.5°. The
outlet, Tout, and the inlet, Tin, temperatures were measured by using T- type
thermocouples and the global solar radiation incident on an inclined surface
was measured by using a Pyranometer.
Description:
Supervised by
Professor Dr. A.K.M. Iqbal Hussain,
Department of Mechanical & Chemical Engineering (MCE),
Islamic University of Technology (IUT), OIC,
Board Bazar, Gazipur.
