1. A building with an internal temperature of 19C and an outside air temperature of 5C...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
1. A building with an internal temperature of 19C and an outside air temperature of 5C loses heat at a rate of 20kW. To match this heat loss a heat pump operating on a vapour compression cycle is used to extract heat from an external underground heat source. a) b) If the coefficient of performance of the heat-pump system is 2.4 determine the electrical power consumption of the compressor required to drive the heat pump and the rate of heat absorption from the external underground source. [4] c) Sketch the heat-pump system and show the heat pump cycle on a sketch of the pressure-enthalpy diagram identifying the respective processes on the diagrams. [6] d) R134A is to be used as the working fluid in the heat pump. The compressor output pressure and temperature are 7.7bar and 50C and at the condenser outlet the fluid is a saturated liquid. Estimate the mass flow rate of the refrigerant to achieve the required heat output. [5] Why might the time taken for this heat pump to heat up the building from a cold initial condition be slower than for conventional gas central heating? [2] 1. A building with an internal temperature of 19C and an outside air temperature of 5C loses heat at a rate of 20kW. To match this heat loss a heat pump operating on a vapour compression cycle is used to extract heat from an external underground heat source. a) b) If the coefficient of performance of the heat-pump system is 2.4 determine the electrical power consumption of the compressor required to drive the heat pump and the rate of heat absorption from the external underground source. [4] c) Sketch the heat-pump system and show the heat pump cycle on a sketch of the pressure-enthalpy diagram identifying the respective processes on the diagrams. [6] d) R134A is to be used as the working fluid in the heat pump. The compressor output pressure and temperature are 7.7bar and 50C and at the condenser outlet the fluid is a saturated liquid. Estimate the mass flow rate of the refrigerant to achieve the required heat output. [5] Why might the time taken for this heat pump to heat up the building from a cold initial condition be slower than for conventional gas central heating? [2]
Expert Answer:
Answer rating: 100% (QA)
The question youve presented is related to thermodynamics and heat pump systems Lets go through each part stepbystep a Sketch the heatpump system and show the heat pump cycle on a sketch of the pressu... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
Students also viewed these mechanical engineering questions
-
A building with an internal volume of 400 m3 is to be heated by a 30 - kW electric resistance heater placed in the duct inside the building. Initially, the air in the building is at 14C, and the...
-
A building with an internal volume of 400 m3 is to be heated by a 30-kW electric resistance heater placed in the duct inside the building. Initially, the air in the building is at 14°C, and the...
-
1) A survey of 200 public universities indicated that the 25th percentile of the yearly tuition cost of the universities was $4600 and the 75th percentile was $7100. The minimum value was $2000, the...
-
A person riding in a subway train drops a ball from rest straight downward, relative to the interior of the train. The train is moving horizontally with a constant speed of 6.7 m/s. A second person...
-
In Exercises find the indefinite integral. Use a computer algebra system to confirm your result. 1 sec x tan x - dx
-
SWIGART v. BRUNO CALIFORNIA COURT OF APPEALS 13 CAL. APP. 5TH 529 2017 According to the American Endurance Ride Conference, endurance riding is a highly competitive and demanding sport. It is...
-
Balance Sheet Classification of Various Liabilities how would each of the following items be reported on the balance sheet? (a) Accrued vacation pay. (b) Estimated taxes payable. (c) Service...
-
6. [5] (A) Use integration to solve the "differential equation", dy dx 4 1+x' Note that the value of the solution at x=1 is . y(0) = 0 (B) Get a numerical approximation to 7 by using Euler's Method...
-
1. Liam Richardson is the business manager for the Smith & Lyngate Insurance agencies in the state of Maryland. Liam is interested in increasing the number of agents in Baltimore and plans to buy...
-
(5 points) Find the absolute maximum and minimum values of f(x) = 4x interval (-, +o). occurs at x = - absolute maximum is x occurs at x = absolute minimum is + 9x - 2, if any, over the and it and it...
-
what effect do you think Lisa's attitude toward the recent changes in the practices had on how she handled having to assist Dr. Janklowicz?
-
Procter& Gamble (P&G), founded in 1837, is a multinational consumer goods corporation. Every day around the world, four billion consumers place their trust in one or more Procter and Gamble products....
-
locate 2-3 resources specific to healthcare reform and the impact that healthcare reform might have on our system. Consider searching for "impact of healthcare reform" or "healthcare reform...
-
1-What additional development can help you prepare to demonstrate the competencies required in your desired HR career path? 2-How might a professional certification be useful to you in your HR career...
-
You received new tyres for replacement. How do you follow sustainability best practice in storing and disposing old tyres?
-
Find all the solutions of the system of equations *, + 2x, x, = 1, 3x, 2x, + 2x, = 2, 7x, - 2x, + 3x, = 5
-
Access the Federation of Tax Administrators Internet site at www. taxadmin.org/state-tax-forms and indicate the titles of the following state tax forms and publications: a. Minnesota Form M-100 b....
-
Reconsider Prob. 13-57. Using EES (or other) software, compare the results obtained assuming ideal-gas behavior with constant specific heats at the average temperature, and using real-gas data...
-
A vertical 12-cm diameter piston - cylinder device contains an ideal gas at the ambient conditons of 1 bar and 24oC. Initially, the inner face of the piston is 20 cm from thebase of the cylinder. Now...
-
A 75-kg man decides to lose 5 kg without cutting down his intake of 4000 Calories a day. Instead, he starts fast swimming, fast dancing, jogging, and biking each for an hour every day. He sleeps or...
-
Smith Company produces and sells one product for $40 per unit. The company has no beginning inventories. Its variable manufacturing cost per unit is $18 and the variable selling and administrative...
-
Which of the following statements is false? (You may select more than one answer.) a. Under variable costing, only those manufacturing costs that vary with output are treated as product costs. b....
-
Smith Company produces and sells one product for $40 per unit. The company has no beginning inventories. Its variable manufacturing cost per unit is $18 and the variable selling and administrative...
Study smarter with the SolutionInn App