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Reconsider Prob. 11-32. Using EES (or other) software, investigate the effect of varying the compressor isentropic efficiency over the range 60 to 100 percent. Plot the power input to the compressor and the electric power saved by using a heat pump rather than electric resistance heating as functions of compressor efficiency, and discuss the results.
Prob. 11-32
A heat pump using refrigerant-134a heats a house by using underground water at 8°C as the heat source. The house is losing heat at a rate of 60,000kJ/h. The refrigerant enters the compressor at 280 kPa and 0°C, and it leaves at 1 MPa and 60°C. The refrigerant exits the condenser at 30°C. Determine (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump.
The 1-hr UH in the table was recorded for a particular watershed. Determine the size of the watershed in acres and then convert the 1-hr UH into a 3-hr UH for the watershed.
A transit was set at point M and a leveling rod was held vertically at point N. The horizontal cross line of the telescope was inclined so the reading of the horizontal cross line on the rod was 12 ft.
The current landfill site covers 50 acres, including 5 acres needed for access roads and auxiliary facilities, and has completed one lift on the site of solid waste. If two more lifts are envisioned before closure, how long would it take to complete ..
Compare the maximum shear stress and the angle of torsion for members of equal lengths and cross-sectional areas with square, rectangular and circular section. All members are subjected to the same torque
A home washing machine removes grease and dirt from clothes in a first-order process in which 12% of the grease on the clothes is removed per minute. The washing machine holds 50.0L of water and has a wash cycle of 5.00 minutes before discharging the..
a simple curve has a central angle of 42degreess. a point y is located 24m from the vertex and has a perpendicular
Magachlor is present in a lake having a volume of 20,000,000m3 that is used for drinking water. This waterbody can be considered well mixed. Megachlor can beconsidered a conservitive pollutant.
A nozzle is designed to linearly accelerate the fluid from V1 to V2 (i.e., V = ax +b, where a and b are constants). The flow at t = 0 is
The uniform 30 kg bar OB is secured to the accelerating frame in the 30 degree position from the horizontal by the hinge at O and roller at A. if the horizontal acceleration of the frame is a equals 20 m/s^2
If the discharge is 500cfs, what power output may be expected from the turbine. Assume that the turbine efficiency is 90% and that the overall head loss is 1.5V 2/2g, where V is the velocity in the 7 ft penstock.
In an oedometer test, the void ratio of a clay sample changed from 1.62 to 1.41 as the vertical effective stress imposed on the sample was increased from 100 kPa to 200 kPa.
a draw the shearing force diagram and the moment diagram of the following problem. the beam is indeterminate. you need
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