Chapter 8, Problem 8.84P

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A solar collector absorbed 40W/m2 heat from the atmosphere. This is equal to the convection brought by air for drying purpose. If the temperature of the air is 40C while the solar collector area's temperature is 80C and neglecting effect of radiation, find the convective heat transfer coefficient.

A 4 kW 20L water heater is switched on for 10minutes. The heat capacity of water is 4.187 kJ/kgK. Assuming total electrical energy has gone intoheating the water, find the increase in watertemperature.

A compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that this particular compressor also involves heat loss (i.e., this compressor, in a non-typical fashion, has a non- zero q; i.e., you cannot neglect q for this compressor). If the compressor operates in a reversible isothermal manner, find the specific heat transfer and specific work.

A mass-loaded piston/cylinder shown in figure containing air is at 300 kPa, 17°C with a volume of0.25 m³ while at the stops V = 1 m³. An air line, 500 kPa, 600 K, is connected by a valve that is then opened until a final inside pressure of 400 kPa is reached, at which point T = 350 K. Find irreversibility assuming that heat transfer is with the surroundings at 17°C.

A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.

A feedwater heater has 5 kg/s water at 5 MPa and 40°C flowing through it, being heated from two sources, as shown in Fig. 8.6. One source adds 900 kW from a 100°C reservoir, and the other source transfers heat from a 200°Creservoir such that thewater exit condition is 5 MPa, 180°C. Find the reversible work and the irreversibility.   KINDLY HELP WITH THIS QUESTION ,ON HOW ONE GET VALUES FROM STEAM TABLE FOR INLET AND EXIT STATE? Please let me know which steam table did you use and also indicate table number and tible of the table used ,lastly show all calculations.

A compressor In a refrigerator recelves R-410A at 150kPa, -40°C, and It brings the vapor up to 600 kPa using an actual specific work of 60 kJ/kg In an adlabatic compression. Surrounding temperature Is 25°C. Find the specific reversible work and the Irreversibility.

Through a combustion of a fossil fuel at 35000C, an engine receives energy at a rate of 3000Btu/s to heat a steam to 15000C. There is no energy loss during the combustion process, the steam in turn produces 1000Btu/s of work and rejects the remaining energy to the surrounding at 3000C, What is the thermal efficiency of the plant? What is the reversible work and Carnot efficiency? What is irreversibility?