Solar Aluminium Tubular Air Heater | B.E. Mechanical Engineering Project

B.E. Mechanical Engineering Projects

Solar Aluminium Tubular Air Heater

As fossil fuels are depleting very fastly from this world, there is need to preserve these resources and  make use of renewable energy resources like solar energy.
This demand has been sufficed by many, especially those in developing countries. 
The heat pump laboratory has solar collectors where different experiments are going on.Solar Aluminium Tubular Air Heater is an integral part of the research work that is going on. It has been developed by introducing many important modifications on the previous model of the same but 5 meters square area. The main purpose behind these is to get the cost-efficient system in terms of cost, weight and higher efficiency. 
Solar Aluminium Tubular Air Heater | www.enggarena.net
The concerned solar collector aims to important efficiency of about 75% with the temperatures attainable  up to 120 degC. This can be used for drying or heating purpose.
The objective of this project is to find pressure drop which has to be minimum so that it accounts for minimum losses and hence becomes more cost efficient. Low weight, reduced material loss and higher efficiency are the desired outcomes of this model. The pressure drop reduced has been compared with the pressure of the previous model and calculations are checked with MATLAB.

Methodology

So many literatures on solar collectors are studied and the informations gathered from the literatures was used for testing of different types of models. This was done with the help of pressure calculations.  Using pressure drop formula for laminar and turbulent flow pressure drop across the collector, with the help of MATLAB and finding rate through blower fans attached. The pressure is calculated by using Darcy's formula depending upon the Reynold's number, deciding the nature of air flow.
Along with the pressure losses due to friction, major losses like entry/exit losses, sudden expansion have been noted. Hence we get a reduced value of 17.48 mm of water pressure drop across the collector.
MATLAB software has been used to calculate the pressure drop between any two points on the system. This software has many applications like performing, documenting and sharing all the calculations and the design work. 
Solar energy has one thing that have remained an intrigued topic since days of yore. Using heat transfer and fluid mechanics concept, we have explored to find the desired outcome model. The conventional source of energy are fast depleting and this leads us to use of non-conventional sources of energy like solar energy.
The idea projected here to prepare the collector is to ensure the cost efficiency of the system which implies low cost model and low weight model that saves the energy and provide optimum usable energy.

Conclusion

A low cost and low weight but higher efficiency build Solar Aluminium Tubular Air Heater is developed at the heat pump laboratory at IIT Bombay. This roof solar collector can be used for various applications like agro produce drying, drying of wood in timber processing, pulp industry and detergent powder industry, room heating in cold regions, cloth drying in laundries, etc.
It also can be used in pasteurizing, drying, beaching, pickling.

Future Scope

As non-renewable resources are depleting fast or the demand of alternate energy sources like renewable source such as solar energy are slowly establishing their network, there is nothing to defy the fact that the solar energy holds good potential in present arena as well as future to conserve the energy and convert it into usable form. Hence, future awaits for technology blending with solar energy and giving much more innovative and cost effective solar collectors.
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Sujit Kadus

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