A water-heater is covered up with insulation boards over a total surface area of 3 m2. The inside board surface is at 75°C and the outside surface is at 20°C and the board material has a conductivity of 0.08 W/m K. How thick a board should it be to limit the heat transfer loss to 200 W ?

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Thermodynamics Practice Test: Work and Heat Transfer — practice the complete quiz, review flashcards, or try a random question.

Work and Heat Transfer topics include: Work transfer, conduction & radiation, heat transfer and other types of work transfer. In thermodynamics, work and heat are two fundamental concepts used to analyze energy transfer.  Heat and work are two different ways of transferring energy between systems. Heat is associated with the random motion of particles, while work is associated with ordered motion in one direction.  The first law of thermodynamics can be used to analyze the relationship between work and heat. The formula for internal energy is:  ΔU = Q + W  Where: ΔU: is the internal... Show more

A water-heater is covered up with insulation boards over a total surface area of 3 m<sup>2</sup>. The inside board surface is at 75°C and the outside surface is at 20°C and the board material has a conductivity of 0.08 W/m K. How thick a board should it be to limit the heat transfer loss to 200 W ?