2. Air flows steadily at a rate og 0.5 kg/s through an air compressor, entering at 7 m/s, 100kPa of pressure and 0.95 m3/kg specific volume and leaving at 5 m/s, 700 kPa and 0.19m3/kg. The internal energy of the air leaving is 90 kJ/kg greater than that of the airentering. Cooling water in the compressor jacket absorbs heat from the air at the rate of58 kW. Compute the work in kW.

Air flow rate through the compressor, m' = 0.5 kg/s velocity of air at the inlet to compressor ,…

Answered: Air flows steadily at a rate og 0.5…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3 to 3.00 m3 and 12.5 kJ is transferred to the gas by heat, what are the change in its internal energy (in kJ)?
How much energy must be transferred as heat for a reversible isothermal expansion of an ideal gas at 132 degrees Celcius if the enthropy of the gas increases by 46.0 J/K
A gas burner transfers 9.20 × 105 J into a block of ice with a mass of 2.29 kg and an initial temperature of 0°C. (a) How much of the energy (in J) supplied by the burner goes into melting all the ice into liquid water? (Enter you answer to at least three significant figures.) 769440 Melting is a phase change from solid to liquid and requires an energy transfer of Q = mLf where Li latent heat of fusion. Freezing is a phase change from liquid to solid and requires an energy transfer of Q = -mLf. In freezing, the energy transfer is negative because energy is removed from the substance. J (b) How much of the energy (in J) supplied by the burner goes into raising the temperature of the liquid water? (Er your answer to at least three significant figures.) 1.57E+5 X Think about conservation of energy. The total energy supplied is known, and you found in part (a) the energy t goes into melting. How much is left over? J (c) What is the final temperature of the liquid water in degrees Celsius?…
A 75 kg person cannot go out for a long time due to Covid-19 restrictions. That's why he rides a bike at home to keep his weight stable. During bicycling, his body produces energy at a rate of about 450 W due to metabolism, 80% of which is converted to heat. The person's body gets rid of all this heat by evaporating water (sweat). How many grams of water must the person's body evaporate in an hour? The heat of vaporization of water at body temperature is 2.42 x 10^6 J/kg.
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By jogging, a girl is converting food energy into internal energy at the rate of 399 kcal/h above her basal metabolic rate (BMR). Some of this additional internal energy immediately goes into work done at a rate of 56.1 W. The rest of this additional energy would go into raising her temperature, but it is instead eliminated by evaporation of perspiration to keep her body temperature constant. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100°C. (a) Determine the hourly rate (in kg/h) at which water must evaporate from her skin. kg/h (b) When fat is metabolized, hydrogen atoms in fat molecules are transferred to oxygen to form water. Assume that the metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of water. What percent of the water needed is generated by burning fat?
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An air conditioner with refrigerant 134a is used as a working fluid to maintain a room at 23oC by rejecting the waste heat to the outside air at 37oC.The room gains heat through the walls and windows at a rate of 250 kJ/min, while the heat generated by the computer, TV and lights is 900 W.The refrigerant enters the compressor at 400 kPa as saturated steam at a rate of 200 L/min and exits at 1,200 kPa and 70oC.Determine a) the actual COP, b) the maximum COP and c) the minimum volumetric flow of the coolant at the compressor inlet for the same compressor input and output conditions.
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