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A mixing chamber which is heated externally by hot air has two inlets and one exit. The water in each inlet and exit is at a pressure of 5 bar. Water enters through inlet 1 (d=6 cm) at 25oC with a m
The pump-turbine system draws water from the upper reservoir in the daytime to produce power for a city. At night, it pumps water from lower to upper reservoirs to restore the situation.
If a kitchen-sink water tap leaks one drop per second, how many gallons of water are wasted annually? what is the mass of the wasted water, in Ib? Asumme that there are 46,000 drops per gallon and
A gas-turbine power plant operates on the simple brayton cycle between the pressure limits 100 and 2000kPa. The working fluid is air, which enters the compressor at 40 Celsius at a rate of 700 m^3/m
The pressure at the 4-in.-diameter outlet of the hydrant is 10 psi. If head losses are negligibly small, determine the power that the pump must add to the water.
At steady state, a refrigeration cycle removes 18,000 kJ/hr of energy by heat transfer from a space maintained at -40oC and discharges energy by heat transfer to surroundings at 20oC.
A power cycle operates between a reservoir at temperature T and a lower temperature reservoir at 280oK. At steady state the cycle develops 40 kW power while rejecting 1000 kJ/min of energy by heat t
Determine the ASTM grain size number if 25 grains per square centimeter are measured at a magnification of 600x? Determine the ASTM grain size number if 20 grains per square centimeter are measured at
The City of Houston has a water filtration system that consists of a large rigid tank with a single 1.5m diameter inlet pipe and two 0.9m diameter exit pipes. Water enters the system through the inl
Consider a simple Brayton Cycle using air as the working fluid; has a pressure ratio of 12; has a maximum cycle temp of 600 Celsius; and operates the compressor inlet at 90 kPa and 15 Celsius.
The water discharges to 0.1MPa. IF the flow is isothermal, determine the pressure of the water source nedded to operate this device and the outlet velocity of the water.
A steam power plant operates on the ideal reheat rankine cycle. Steam enters the high-pressure turbine at 6 MPa and 400 C and leaves at 2 MPa. Steam is then reheated at constant pressure to 400 C be
Consider a compressor operating at steady state. How would you compare the volume flow rate of the air at the inlet and exit? How about the mass flow rate?
The isentropic efficiency is known from manufacturer's data to be 83.2% in this situation. Determine the temperature at the turbine's exit (°C). Assume constant specific heats.
The turbine is not well insulated and thus there is a heat transfer rate of 20 MW to the atmosphere. Determine the power delivered by the turbine in MW.
The 20°C surroundings experience an entropy increase of 0.008 kW/K. Determine (a) the rate of heat loss from the compressor, (b) the exit temperature of the refrigerant, and (c) the rate of ent
A food department is kept at -15 degrees Celsius by a refrigerator in an environment at 25 degrees Celsius. The total heat gain to the food department is estimated to be 3500 kJ/h and the heat rejec
The loading on the piston is such that the PV product is a constant. Assuming the room temperature is 20°C, show that this process does not violate the second law.
The lowest temperature that has been achieved is about 1 × 10-6 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cool
An inventor claims to have developed a device that takes an air stream at 20°C, 274 kPa, and produces two separate streams, one at 60°C, 270 kPa.
The Department of Energy projects that between the years 1995 and 2010, the United States will need to build new power plants to generate an additional 150,000 MW of electricity to meet the increasi
An air-standard Otto cycle has a compression ratio of 8 and the temperature and pressure at the beginning of the compression process are 5208R and 14.2 lbf/in.2, respectively. Determine the maximum
What is meant by the mechanical loss coefficient, ?, of a material? Give examples of designs in which it would play a role in design-limiting property. What is meant by the endurance limit, , of a