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Problem 1
An experimentalist claims to have raised the temperature of water from room temperature to 150oC using saturated steam at 200 kPa. Evaluate his claim based on Second law of thermodynamics.
Problem 2
Solar energy stored in large bodies of water called solar ponds is being used to generate electricity. If such a solar power plant has an efficiency of 4% and a net power output of 350 kW, find the average value of the required solar energy collection rate in Btu/hr.
Problem 3
An air conditioning system is used to maintain a house at 75oF while the outside is at 95oF. The house is gaining heat through walls and windows at a rate of 800 Btu/min and heat generation rate within the house from people and appliances is 100 Btu/min. Determine the minimum power input required for this air conditioning system.
Problem 4
A cup of hot coffee at 75oC can only lose heat to the room at 25oC and come in thermodynamic equilibrium with atmosphere. Explain this using the Principle of increase in entropy of universe. Assume heat capacity of coffee to be 3.9 kJ/kg-K.
Problem 5
Find the change in entropy of 1 kg of air if its temperature and pressure are doubled in the process.
70. In a gas-fired boiler, water is boiled at 145 degrees celcius by hot gases flowing through a stainless steel pipe submerged in water. If the rate of heat transfer from the hot gases to water is 81.04 kJ/s, determine the rate of evaporation of water.
a piston has an area of 500 mm2. what mass must the piston has if it exerts a pressure of 50 kpa above atmospheric
Calculate the load capacity of a precast concrete pile that is 14in. in diameter and is driven into soil resistance of 2.5 tons per square foot. Assume the top 5 feet of the pile cannot develop any shear resistance. Total pile length is 35 feet.
assuming that the solid shaft has been replaced by a hollow shaft of the same cross-sectional area and with an inner diameter equal to half of its own outer diameter.
air compressor is used to compress 0.03 kgs atmospheric air from 1 bar and 25oc to 10 bar. if the compression process
Solve this problem with a linear programming model. Describe the optimum mix of raw materials and production levels for the products. How much profit does the business make?
a 10-m long and 10-mm inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process.
determine the maximum theoretical speed that may be achieved over a distance of 360ft by a car of weight w starting
according to a recent article hot-air volumes must be large because air heated to 150 degrees fahrenheit over ambient
consider two very large parallel plates. the bottom plate is warmer than the top plate which is held at a constant
a cylindrical specimen of aluminum having a diameter of 19 mm and length of 200 mm is deformed elastically in tension
find the best fit Gaussian Curve through the data and plot the data and curve on the same graph.
water initially saturated vapor at 4 bar fills a closed rigid container. the water is heated until its temperature is
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