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STUDY OF SOLAR AIR HEATING SYSTEM WITH AND WITHOUT THERMAL ENERGY STORAGE

KrishiKosh

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Title STUDY OF SOLAR AIR HEATING SYSTEM WITH AND WITHOUT THERMAL ENERGY STORAGE
 
Creator Srivastava, Ravish Kumar
 
Contributor Rai, Dr A. K.
 
Subject null
 
Description Energy is a crucial driving factor in today's world and plays major role in economic growth and
industrialization. Population growth and its material needs increase the demand of energy every
year. Developing countries are heavily dependent on the fossil fuels for their energy needs. This
causes depletion of fossil fuel resources and degradation of environment. The drift between
demand and supply of energy is growing continuously and consistently, thus compelling the
habitats of this planet to utilize the fossil fuels at a drastic rate in last forty years. Use of
renewable energy sources may be alternative to the fossil fuels which also saves the
environment.
With growth concern for global worming following the increased CO2 concentration in the
atmosphere, the need for sustainable and renewable energy sources has been recognized for a
long time. This is reflected in the recent agreement at the 2015 United Nations climate change
Conference, COP 21 in Paris, stating that a cut of green house gas emissions by 40-70 % is
increased before 2050. This is a grand global challenge since about 80 % of today’s total energy
supply comes from fossil fuels that involve most of the green house gas emissions. Thus it is
widely recognized that a green shift from mainly fossil energy sources to renewable energy.
Therefore there is a great need to explore the renewable energy sources and to develop the
renewable energy based technologies to meet our energy demand in the present context. Solar
energy is the one most abundant renewable energy source and emits energy at rate of
3.8x1023kW, of which, approximately 1.8x 1014kW is intercepted by the earth.
According to IEA report of 2011, India is one of the most favored nations of the Sun as it
receives 5,000 trillion kWh of insolation yearly, which is greater than the annual consumption
and a global radiation of around 4-7kWh/m2/day. Even though the intensity of Sun’s illumination
is low and intermittent, technology has developed to harness the renewable energy in usable
form.
One of the most potential applications of solar energy is the supply of hot air for the drying of
agriculture, textile, and marine products, heating a building to maintain a comfortable
environment especially in the winter season and also in many other low temperatures
applications. The simplest and the most efficient way to utilize solar energy is to convert the
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thermal energy for heating applications by using solar collectors. Solar air heaters, because of
their simplicity are cheap and most widely used. There are certain methods to augment the heat
transfer from the surface of solar air heaters.
An exhaustive literature review is accomplished on investigations and practical implementation
of the thermal performance of the ‘solar air collectors’ depends on the material, shape,
dimensions, layout of the collectors.
This comprehensive survey reveals that less research work has been carried out on the off day
performance of solar air heater. This novel solar air heater are fabricated with an arrangement of
Tray in which a Thermal energy storage material is placed and a thermal conducting material
(Aluminum powder) is mixed with this to improve PCM charging and also it helps to obtain off
sun hour performance. This modification on solar air heating system has promising performance
and can be created relatively with an ease as compared to conventional method of pasting Fins
on the on the surface. Therefore, the present experimental investigation is primarily focused on
analyzing intricate details of heat transfer, losses and improvement in account of exit
temperature in characteristics of using Fins & PCM blend with thermal conducting material
powder as improvement constituent in solar air heaters.
An experimental set up has been designed and fabricated in accordance with the guidelines
suggested in ASHRAE standard 93-77 for testing of solar collectors. It consists of a rectangular
duct having entry, test and exit sections, a fan, Regulator to maintain mass flow rate, a calibrated
Thermocouple for the measurement of temperature. Anemometer and solarimeter are used to
measure wind speed and solar intensity used Extensive data has been recorded on heat transfer
and mass flow characteristics of a rectangular duct having Fins arranged in reverse side of absorber
plate with minor gap to bottom & also of proposed novel solar air heater. Experimental data are
further processed to obtain heat transfer coefficient, different losses, and developed correlations
for Nusselt number & Reynold’s number etc. A computer program has been developed to predict
the thermal performance of solar air heater in terms of energy, exergy & Loss of destructions in
exergy. This parameter includes Heat removal rate, collector efficiency, fin efficiency, total loss,
area, mass flow rate etc.
Energetic & exergetic performance has been investigated and compared in order to determine the
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enhancement in performance on account of the use of PCM with thermal conducting material &
with fin shaped geometry. Design plots were also prepared for practical & theoretical energetic &
exergetic efficiency, Loss of destruction and especially off day performance of solar air heater is
plotted in the result section.
 
Date 2018-04-19T10:40:08Z
2018-04-19T10:40:08Z
2017
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810044173
 
Language en
 
Format application/pdf
 
Publisher DEPARTMENT OF MECHANICAL ENGINEERING SHEPHERD INSTITUTE OF ENGINEERING AND TECHNOLOGY, SAM HIGGINBOTTOM UNIVERSITY OF AGRICULTURE, TECHNOLOGY & SCIENCES Allahabad-211007.(U.P.) India