Selecting a gas to fill a homemade solar water heater?
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AIDG has partnered with the University of California – Berkeley to develop a low-cost solar hot water heater. The goal of the project is to design a solar hot water heater that can be built at XelaTeco, sold for 0, and that would produce 100 L of hot water per day.
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Question by JacobLytle: Selecting a gas to fill a homemade solar water heater?
I am making a solar hot water heater as the project for my Engineering Science class. My question pertains to the gas in the panel. Which gas would give the highest temperature inside the panel? And also, If i pressurize the panel chamber would it effect the temperature inside the panel?
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One Response to Selecting a gas to fill a homemade solar water heater?
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Thermal mass (also called heat capacity) is the capacity of a body to store heat. There are two varieties of the heat capacity Cp and Cv where Cp is ate constant pressure and Cv is at constant volume, the higher the heat capacity the more heat the substance may retain, Hydrogen has a very high heat capacity 10.16 kJ/kg*K, though it may be a bit dangerous, the next could be Nitrogen tetroxide at 4.6 kJ/kg*K, the heat capacity is a function of temperature, and will vary as the temperature changes.
http://www.engineeringtoolbox.com/spesific-heat-capacity-gases-d_159.html
Chem–Math & Engineering Guinness
October 15, 2011 at 1:53 am