Abstract-
The modified air cooler cum storage system
is a type of conventional air cooler which is used for providing
room cooling as well refrigeration systems. The system
consists of a lower tank which is a mud pot whose outer
periphery is filled by sand slurry. The lower tank and the
slurry are held by a larger mud pot, i.e., a pot-in-pot system.
The lower tank is filled with water and it is connected to the
upper tray through a pump. The water in the upper tray is
passed through a cooling pad which is used for absorbing the
water. A fan is fixed next to the cooling pad and is followed by
a vent system. The tray also has another port which is
connected to the cold storage box. On running the system for 5
hours, the temperature of a 960 cubic feet room gets reduced
by 12o C and the temperature of the cold storage box gets
reduced by 11o C and reaches 24o C, hence providing the right
temperature for storage of perishable items.
Keywords - Evaporative Cooling, Heat Transfer, Sir
Cooler, Pot System.
I. INTRODUCTION
India is a tropical country in which most of the regions
experience very low temperatures during the winter and
very high temperatures during the summer seasons. That
is, the temperature range between summer and winter
seasons is very large. Hence, it is not a very pleasant
experience and highly uncomfortable. Though cheaper
methods of heating are available during the winter
season, methods of cooling down the hot temperatures during
the summer do not have wide variety of options. Air
conditioners have high initial and running costs, which cannot
be afforded by all the people in a developing country like
India. Air coolers are relatively cheap, but provide
unsatisfactory results; there is a need for developing a cheaper
room cooling system. Conventional air conditioning is one of
the major contributors of CFCs into the atmosphere. An
alternative type of cooling, which does not expel CFCs is
highly desirable as one important step in the correction of this
problem. So, this is why adiabatic cooling is environmentally friendly because it is a passive cooling method that does not
expel CFCs. It is 100% fresh air-cooling which even helps to
clean the air it cools. With the help of Evaporative Technology
swamp coolers provide cooling at cheaper than central air or
larger air conditioners.
A Regenerative type evaporative cooler cools air using a heat exchanger in addition to the direct evaporative method of cooling. It is observed that the overall efficiency of
the system and the COP increase by about 20-25% than the
normal air cooler system but the initial and maintenance costs
of the system are increased due to the addition of a heat
exchanger and a pump. The size of the system also increases
due to the addition of more components.
A multi- utility desert cooler is one in which
water cooling as well as cold storage systems are attached in
addition to the air cooling system. The average effectiveness
was found to be 65.42% and a temperature range of 22-27o C
was achieved. It can be used only in areas with high
temperature and low relative humidity hence reducing its
scope.
Ndukwu Macmanus Chinenye developed a clay
evaporative cooler for the purpose of preservation of fruits and
vegetables at a lower temperature and also to study the
physical parameters such as cooling efficiency, cooling
capacity, etc. in the system. The results showed that the
evaporative cooler reduces the temperature up to 10o C and
increases the relative humidity of incoming air for the storage
chamber. The evaporative cooler was able to preserve freshly
harvested tomatoes for about 19 days. It is observed that clay
is a material which helps in evaporative cooling and has
shown proven results and hence can be used as a vital element
in the air cooling system.
Hence, it is proposed to build an air cooler which
provides better room cooling in addition to providing a cold
storage box for refrigeration purpose at a cheap initial, running
and maintenance costs which will meet the demands of a large
section of the society who find it difficult to bear the hot
temperatures.
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