Plot the power input to the compressor and electric power

Assignment Help Civil Engineering
Reference no: EM131032780

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.

Reference no: EM131032780

Questions Cloud

Find the articles on one theme related to gender : Select 3 article/feature in one of the major English Newspapers or weekly/monthly from anywhere around the world that deals with an issue related to Gender, and write a summary and critique of it. You need to find the articles on one theme related ..
Can these risks be minimized : An employee comes to your office and says he wants to anonymously make a complaint to the US Occupational Safety and Health Act. He doesn't want his identity known to his supervisor, who told a group of employees that he would make life difficul..
Which the refrigerant should be compressed : If this refrigerator is to operate in an environment at 30°C, what is the minimum pressure to which the refrigerant should be compressed? Why?
Find an example of a public agency or non-profit corporation : Find an example of a public agency or non-profit corporation that shifted its mission in recent years. How was their strategic plan altered as a result of their change in services, and what was the result?
Plot the power input to the compressor and electric power : 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.
Discuss practical knowledge of global business strategy : Analyse, evaluate and discuss theoretical and practical knowledge of global business strategy, in the context of Political, Economic, Social, Technological, Environmental and Legal issues
Write a paper about life of soldiers in the british army : Write a research paper about Life of soldiers in the British army during World War I. In your discussion you will have to use 3 sources, with Last Man Standing being one of them.
What is your cpa going to tell you : What issues are raised by this scenario, why and what might you do about it? What contractual provisions might be called into play - Are the cowboys who sell your products to commercial customers going to create risks for the company?
Calculating the project''s operating cash flows, : a. In calculating the project's operating cash flows, the firm should not deduct financing costs such as interest expense, because financing costs are accounted for by discounting at the WACC. If interest were deducted when estimating cash flows, thi..

Reviews

Write a Review

 

Civil Engineering Questions & Answers

  Divide the sodium hydroxidecharge into 10 smaller charges

Divide the sodium hydroxidecharge into 10 smaller charges, and add them one at a time, makingsure that each is well mixed and the tank temperature has stoppedincreasing before adding the next charge.

  What will be the concentration of tce in the aqueous phase

The dimensionless henry's constant for TCE at 25 degrees celsius is 0.4. A sealed glass vial is prepared that has an air volum of 4mL overlying an aquesous volume of 36mL.

  Determine the torque that develops in the rod in in-lb

The end of a 0.75-in-diameter rod is fixed to an immovable plate. The length of the rod is 18.0 in. A 50-lb weight is attached to a 16.0-in lever at the end of the Rod so that the weight is hanging perpendicular to the longitudinal axis of the rod..

  Determine the alkalinity and ph of the mixture

Two waters are in equilibrium with air, one at pH 9.5 and one at pH 7.3. these waters are mixed in 1:1 proportions. Assuming that carbonate species dominate the acid/base behavior of boh solutions and that no gas transfer occurs when they are mixed

  Fresh water fish do not survive in water

If the concentration of glucose in plasma is 5 mM, and theintracellular glucose concentration is negligible (i.e. 0 mM), whatis the rate of glucose diffusion (J) into the cell? Assume that thethickness of the plasma membrane is 10 nm.

  A vertical curve is formed when a rural highway passes

a vertical curve is formed when a rural highway passes under a bridge joining a -8 grade to the horizontal grade

  Determine the heat removed from the refrigerated space

Refrigerant R134a enters the compressor of a refrigerator at 0.14 MPa and -10°C at a rate of 0.12 kg/s and leaves it at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and .065 MPa and it is throttled to 0.15 MPa.

  Find factor of safety for a 9 foot long hollow steel column

Determine the factor of safety for a 9 foot long hollow steel column 3.5 inches on a side that has a wall thickness of 0.225 inches and is loaded with a 22 kip load.

  Determine the acceleration of the vehicle immediately

A vehicle is traveling on a curved section of a road of radius 2500 feet at a speed of 60 mi/h. The motorist suddenly applies their brakes, causing the automobile to slow down at a constant rate. After 8 seconds the speed has been reduced to 45 mi..

  Design the shear reinforcement

Problem Statement: A rectangular beam having b = 10 in. and d = 17.5 in. spans 15 ft face to face of simple supports. It is reinforced for flexure with three

  Calculate the force acting on window facing the storm

The wind reaches a speed of 27.8 m/s in a storm. calculate the force acting on a 1m x 2m window facing the storm. the window is in a high-rise building. the air density p= 1.2 kg/m3.

  Determine the water hammer reduction if a divert-er is added

A 2,400 foot long, 2 foot diameter pipline conveys water from ahilltop reservoir to an industrial site. The pipe is made of ductile iron, has an outside diameter of of 2.25 feet, and has expansion joints.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd