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- It is common knowledge that the temperature rises as it is compressed. An inventor thought about using this high temperature air to heat buildings. He used a compressor driven by an electric motor. The inventor claims that the compressed hot air system is 25% more efficient than a resistance heating system that provides an equivalent amount of heating. Is this claim valid, or is this just another perpetual motion machine?What is the total required heating energy in raising the temperature of a given amount of water when the energy supplied is 1000 kwh with heat losses of 25%?A refrigerator is connected to a generator powered by a fuel with a calorific value of 35000 kJ/kg and a density of 0.85 g/cm3 . The inside temperature of the refrigerator is 0°C, and the outside temperature is 20°C. a. How much work is required to freeze 500 g of water? ΔfreezingH° = 6.02 kJ mol– 1 ) b. How much internal energy change occurs during the process? c. Since the generator consumes 5 L of fuel per hour, calculate the thermal efficiency of this engine.
- A thermal plant utilizes 125 gallons of 28oAPI fuel at 26oC in 24 hours while the power guarantee for the same period amounts to 2300 kW-hrs. Determine the thermal efficiency of the plant.Concentrating solar power plants are frequently located in desert areas where they can collect a lot of solar energy. If the power plant produces steam at a temperature of 1,016 oF and is cooled with ambient air at a temperature of 106 oF what is the maximum efficiency of the conversion of solar energy to electricity? Give your answer in percent (%).(i) A can of soft drink at room temperature is put into the refrigerator so that it will cool. Would you model the can of soft drink as a closed system or as an open system? (ii) A candle is burning in a well-insulated room. Taking the room (the air plus the candle) as the system, determine if there is any heat transfer during the burning process. Explain how?
- An air conditioning unit works by taking heat out of a room. As the refrigerant gas expands in the cooling coils, it absorbs heat from the circulating air in the room. This heat is then released as the refrigerant is compressed by the part of the unit that is directed out of the room. The unit serves like a heat pump for the room. Since a refrigerator works in a similar manner, can it also be used to maintain a cool temperature inside a room? Justify your answer.An air conditioning unit works by taking heat out of a room. As the refrigerant gas expands in the cooling coils, it absorbs heat from the circulating air in the room. This heat is then released as the refrigerant is compressed by the part of the unit that is directed out of the room. The unit serves like a heat pump for the room. Since a refrigerator works in a similar manner, can it also be used inside a room? Justify your answer.A piston cylinder device is fitted with stops at the top. Initially.5lbs of R-134a is in the tank at 80F. A heater is turned on that delivers a total of 26.5248 Btus of energy to it. When it is done delivering that the pistons just hits the stops and is a saturated vapor. Further energy is added until the pressure doubles (round to nearest 100's). Determine the total heat transfer, initial volume and the final temperature of the refrigerant. For this question, I uploaded images of all the information related to Refrigerant R-134a in case you need them to answer the question. Thank you!
- It is common knowledge that the temperature of air rises as it is compressed. An inventor thought about using this high-temperature air to heat buildings. He used a compressor driven by an electric motor. The inventor claims that the compressed hot-air system is 25 percent more efficient than a resistance heating system that provides an equivalent amount of heating. Is this claim valid, or is this just another perpetualmotion machine? Explain.A thermal engine uses up 200 J of heat energy per cycle, while its mechanicalwork output per cycle is 40 J. (a) What is this engine’s thermal efficiency? (b) If thisengine is utilized to lift a 100 kg mass to a height of 20 m, through how many cycles doesthe engine have to be run to perform the lift (the answer may not be an integer)? (Hint: tolift a weight to a height, mechanical work must be performed against gravity.) (c)Consider now an ideal thermal engine operating between a hot reservoir and a coldreservoir. Find the temperature (in 0 C) that would be required for the hot reservoir inorder to achieve the same efficiency as the engine in part (a) if the cold reservoir is atroom temperature (25 0 C).Consider the heating of water in a pan on a top of a range. If 24 kJ of heat is transferred to the water from heating element and 6 kJ of it is lost from the water to the surrounding air. Determine;(a) the net heat transfer to the water,(b) the efficiency for boiling water.