In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 720 m3 If air in the house is to be exchanged once every 20 minutes, determine (a) the required flow rate of the fan and (b) the average discharge speed of air if the fan diameter is 0.5 m.. WITH FIGURE OR FBD DIAGRAM, PLEASE.

In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 720 m3 If air in the house is to be exchanged once every 20 minutes, determine (a) the required flow rate of the fan and (b) the average discharge speed of air if the fan diameter is 0.5 m.. WITH FIGURE OR FBD DIAGRAM, PLEASE.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 1RQ: Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop...

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In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 720 m3 If air in the house is to be exchanged once every 20 minutes, determine (a) the required flow rate of the fan and (b) the average discharge speed of air if the fan diameter is 0.5 m..
In a steady flow apparatus, 135 kJ of work is done by each kg fluid. The specific volume of the fluid, pressure, and speed at the inlet are 0.37 m^3/kg, 600 kPa, and 16 m/s. The inlet is 32 m above the floor, and the discharge pipe is at the floor level. The discharge conditions are 0.62 m^3/kg, 100 kPa, and 270 m/s. The total heat loss between the inlet and discharge is 9 kJ/kg of fluid. In flowing through this apparatus, determine the specific internal energy increase or decrease in kJ/kg.
In a steady flow apparatus, 135 kJ of work is done by each kg of fluid. The specific volume of the fluid, pressure, and speed at the inlet are 0.37 m3/kg, 600 kPa, and 16 m/s. The inlet is 32 m above the floor, and the discharge pipe is at the floor level. The discharge conditions are 0.62 m3/kg, 100 kPa, and 270 m/s. The total heat loss between the inlet and discharge is 9 kJ/kg of fluid. In flowing through this apparatus, does the specific internal energy increase or decrease, and by how much?a) 30 kJ/kg c) 20 kJ/kgb) -30 kJ/kg d) -20 kJ/kg
In a steady flow apparatus, 135 kJ of work is done by each kg of fluid. The specific volume of the fluid, pressure, and speed at the inlet are 0.37 m3/kg, 600 kPa, and 16 m/s. The inlet is 32 m above the floor, and the discharge pipe is at the floor level. The discharge conditions are 0.62 m3/kg, 100 kPa, and 270 m/s. The total heat loss between the inlet and discharge is 9 kJ/kg of fluid. In flowing through this apparatus, does the specific internal energy increase or decrease, and by how much? (With drawing to fully understand the question)a) 30 kJ/kg c) 20 kJ/kgb) -30 kJ/kg d) -20 kJ/kg
In a steady flow apparatus, 135 KJ of work is done on each kg of fluid. The specific volume of the fluid, pressure and speed at the inlet are 0.37 m3/Kg, 600KPa, and 160 m/s. The inlet is 32 m below the floor, and the discharge pipe is at floor level. The discharge conditions are 0.62 m3/kg, 100KPag and 27 m/s. The total heat gained between the inlet and discharge is 9 KJ/Kg of fluid. In the flowing through this apparatus, by how much does the specific internal energy increase or decrease?
Water with a specific volume of 0.001 m3×kg-1 flows through a centrifugal pump that operates under steady flow conditions at a volumetric flow rate of 3.0 m3×min-1 from an initial pressure of 75 kPa to a final pressure of 220 kPa. The diameter of the suction inlet to the pump is 12 cm and the diameter of the discharge outlet is 8 cm. If the suction and discharge outlets are at the same level and no change in internal energy, determine the work (HP) done on the water by the pump.
The shaft power from a 90 percent-efficient turbine is 500 kW. If the mass flow rate through the turbine is 440 kg/s, the extracted head removed from the fluid by the turbine is (a) 44.0 m (b) 49.5 (c) 142 m (d ) 129 m (e) 98.5 m
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m × 3 m × 3 m. The air velocity is not to exceed 7 m/s to minimize vibration and noise. The combined efficiency of the fan–motor unit to be used can be taken to be 50 percent. If the fan is to replace the entire volume of air in 15 min, determine (a) the wattage of the fan–motor unit to be purchased, (b) the diameter of the fan casing, and (c) the pressure difference across the fan. Take the air density to be 1.25 kg/m3 and disregard the effect of the kinetic energy correction factors.
Figure shows a single-solar-collector panel with a total surface area of 2.97 m^2. The panel receives its energy from the sun at a certain rate. However, thirty-six percent of the incoming energy is lost to the surroundings. The remaining energy is used to heat liquid water from 40 C to 60 C. The water passes through the solar collector with a negligible pressure drop at a rate of 0.0310 ??/?. By neglecting the kinetic and potential energy effects/differences through the pipe lines,a. Determine the outer surface temperature of the Sun.b. How many “Liters” of water at 60oC can the collectorprovide in a 30-min time period?
In a hydroelectric power plant, water flows from an elevation of 400 ft to a turbine, where electric power is generated. For an overall turbine–generator efficiency of 85 percent, Determine the flow rate of water if the irreversible head loss of the piping system between the free surfaces of the inlet and the outlet is 36 ft.
The mass flow rate of the gas in a gas turbine is 40 kg/s. The specific enthalpy and velocity in the inlet are 1300 kJ/kg and 160 m/s respectively while the outlet are 350 kJ/kg and 50 m/s respectively. Calculate for the work of the turbine if there is a heat loss of 1000 kW. (kW)
A 73-percent efficient 12-hp pump is pumping water from a lake to a nearby pool at a rate of 1.2 ft3/s through a constant-diameter pipe. The free surface of the pool is 35 ft above that of the lake. Determine the irreversible head loss of the piping system, in ft, and the mechanical power used to overcome it.