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Determine the COP of a heat pump that supplies energy to a house at a rate of 8000 kJ/h for each kW of electric power it draws
Determine the boundary work done by a gas during an expansion process if the pressure and volume values at various states are measured to be 300 kPa
Describe the ideal process for an (a) Adiabatic turbine
Derive an expression for the specific-heat difference cp - cv
Derive a relation for the volume expansively b and the isothermal compressibility
Determine the enthalpy of nitrogen, in Btu/lbm, at 400 R and 2000 psia using
Determine the enthalpy change and the entropy change of nitrogen per unit mole as it undergoes a change of state from 225 K and 6 MPa to 320 K and 12 MPa
Determine the enthalpy change and the entropy change of CO2 per unit mass as it undergoes a change of state from 250 K and 7 MPa to 280 K and 12 MPa
Determine the energy destruction associated with each of the processes of the Rankine cycle described, assuming a source temperature of 1500 K and a sink
Determine the COP of a refrigerator that removes heat from the food compartment at a rate of 5040 kJ/h for each kW of power it consumes
Consider two geothermal wells whose energy contents are estimated to be the same. Will the energies of these wells necessarily be the same?
Consider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80°C and to the other from concentrating
Consider the SSSF combustion of propane at 25°C with air at 400 K. The products exit the combustion chamber at 1200 K
Consider the same system as in the problem. Let the valve be opened and transfer enough heat to both tanks so all the liquid disappears
Consider the turbocharger of an internal combustion engine. The exhaust gases enter the turbine at 450°C at a rate of 0.02 kg/s and leave at 400°C.
Consider two systems that are at the same pressure as the environment. The first system is at the same temperature as the environment
Consider two rooms that are identical except that one is maintained at 30°C and 40 percent relative humidity while the other is maintained at 20°C
Consider two identical 80-kg men who are eating identical meals and doing identical things except that one of them jogs for 30 min every day
Consider two identical 50-kg women, Candy and Wendy, who are doing identical things and eating identical food except that Candy eats her baked potato
Consider the combustion of methanol, CH3OH, with 25% excess air. The combustion products are passed through a heat exchanger and exit at 200 kPa
Consider the ammonia Rankine-cycle power plant shown in, a plant that was designed to operate in a location where the ocean water temperature is 25°C
Consider the 100-L Dewar (a rigid double-walled vessel for storing cryogenic liquids). The Dewar contains nitrogen at 1 atm, 90% liquid and 10% vapor by volume
Consider supersonic airflow approaching the nose of a two-dimensional wedge and experiencing an oblique shock. Under what conditions does an oblique
Consider the design of a nozzle in which nitrogen gas flowing in a pipe at 500 kPa, 200°C, and at a velocity of 10 m/s, is to be expanded to produce a velocity
Consider the process. The insulated tank A has a volume of 600 L, and contains steam at 1.4 MPa, 300°C.