A small light bulb (25 W) inside a refrigerator is kept on and 50 W of energy from the outside seeps into the refrigerated space. How much of temperature difference to the ambient(at 20°C) must the refrigerator have in its heat exchanger having an area of 1 m2 and heat transfer coefficient of 15 W/Km2 to reject the leak of energy.

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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 small light bulb (25 W) inside a refrigerator is kept on and 50 W of energy from the outside seeps into the refrigerated space. How much of temperature difference to the ambient(at 20°C) must the refrigerator have in its heat exchanger having an area of 1 m<sup>2</sup> and heat transfer coefficient of 15 W/Km<sup>2</sup> to reject the leak of energy.






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