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A hydraulic lift is to be used to lift a 2500 kg weight by putting a weight of 25 kg on a piston with a diameter of 10 cm. Determine the diameter of the piston
A househusband is cooking beef stew for his family in a pan that is
A household refrigerator that has a power input of 450 W and a COP of 2.5 is to cool five large watermelons, 10 kg each, to 8°C
A hydraulic turbine has 85 m of elevation difference available at a flow rate of 0.25 m3/s and its overall turbine- generator efficiency is 91 percent.
A heat-powered portable air compressor consists of three components:
A hollow spherical iron container whose outer diameter is 20 cm and thickness is 0.4 cm is filled with iced water at 0°C.
A Hilch tube has an air inlet flow at 20?C, 200 kPa and two exit flows of 100 kPa, one at 0°C and the other at 40°C.
A house has an electric heating system that consists of a 300-W fan and an electric resistance heating element placed in a duct.
A horizontal, insulated cylinder has a frictionless piston held against stops by an external force of 500 kN.
A homeowner is trying to decide between a high efficiency natural gas furnace with an efficiency of 97 percent and a ground-source heat pump with a COP of 3.5.
A house is maintained at 1 atm and 24°C, and warm air inside a house is forced to leave the house at a rate of 150 m3/h as a result of outdoor air
A house is losing heat at a rate of 4500 kJ/h per °C temperature difference between the indoor and the outdoor temperatures. Express the rate of heat loss
A heat pump cycle is executed with R-134a under the saturation dome between the pressure limits of 1.8 and 0.2 MPa.
According to the 2005 article "Fit Software Tests to Code Needs," why are coding standards important to testing?
The house gains 0.6 kW per degree temperature difference to the ambient and the heat pump coefficient of performance is 60% of the theoretical maximum
A heat pump receives heat from a lake that has an average winter time temperature of 6°C and supplies heat into a house having an average temperature of 27°C
A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat water from 15 to 45°C at a rate of 0.12 kg/s.
A heat pump operates on the ideal vapor compression refrigeration cycle with R-134a as the working fluid between the pressure limits of 0.32 and 1.2 MPa
A heat pump with a COP of 3.2 is used to heat a perfectly sealed house (no air leaks). The entire mass within the house (air, furniture, etc.)
A heat pump with a COP of 2.8 is used to heat an air-tight house. When running, the heat pump consumes 5 kW of power
A heat pump with a COP of 2.5 supplies energy to a house at a rate of 60,000 Btu/h. Determine
A heat pump with a COP of 2.4 is used to heat a house. When running, the heat pump consumes 8 kW of electric power
A heat pump used to heat a house runs about one third of the time. The house is losing heat at an average rate of 22,000 kJ/h
Companies such as IBM and Ingersoll-Rand have moved beyond JIT to JIT-II systems.
A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed.