Abstract:
Solar powered adsorption cooling system had been investigated with different
adsorbate/adsorbent pair. For the climatic condition of Tokyo, utilizing silica gelwater
pair, at least 15 collectors with cycle time 1500s have been found to be
necessary to get required bed temperature of 85°C. Thus maximum cyclic average
cooling capacity has been reported as 10kW at noon. Following this investigation a
similar scheme has been taken in to consideration to utilize the climatic data of Dhaka
for solar heat driven room cooling purpose. As Dhaka (Latitude 23°46'N, Longitude
90'23'E) isa tropical region and shortage in energy sector is a burning issue for this
mega city, if solar insolation can be properly utilized for space cooling or cold storage
purposes, country could gain a reasonable backup in energy sector. Based on these
possibilities, an analytical investigation of solar heat driven adsorption cooling system
has been done based on the climatic condition of Dhaka, where a two 'bed basic
adsorption chiller with silica gel-water pair as adsorbent and adsorbate have been
considered. The climatic data of a typical hot day of summer has been chosen in order
to investigate for the optimum projection area, performances based on different
collector number and cycle time. For the climatic condition of Dhaka, 22 solar
thermal collectors consisting of a gross 0(53.13m2 projection area with 800s cycle
time is needed for ,maximum cool.ing capacity of 11.9 kW.' For enhancement of
chiller working hours a storage tank has been added with the adsorption cooling
system in two different ways. It is observed that storage tank not only supports the
chiller to remain active for a longer time; till 22.0h at night, but also prevents loss of
heat energy. Furthermore, installed solar thermal collectors along with the hot water
storage tank could be utilized for hot water supply for house hol~ use during the
winter season which could again save notable amount of energy from primary energy
sources like natural gas and electricity which are used for cooking and for water
heating purposes.
