Question: A heat pump delivers 20 kW to heat a house. The outside temperature is 10 o C and the inside temperature of the hot-air supply

A heat pump delivers 20 kW to heat a house. The outside temperature is –10^oC and the inside temperature of the hot-air supply for the heating fan is 40^oC.

(a) What is the coefficient of performance of a Carnot heat pump operating between these temperatures?

(b) What must be the minimum power of the engine needed to run the heat pump?

Step by Step Solution

★★★★★

3.41 Rating (167 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a COP T c T see Problem 21 COP 26... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

10-P-T-S-L (303).docx

120 KBs Word File

Students Have Also Explored These Related Thermodynamics Questions!

A heat pump delivers heat at a rate of 7.81 kW for 10.0 h. If its coefficient of performance is 6.85, how much heat is taken from the cold reservoir during that time?

On a cold winter day, the outside temperature is 15.0C. Inside the house the temperature is + 20.0C. Heat flows out of the house through a window at a rate of 220.0 W. At what rate is the entropy of...

An ideal heat pump is equivalent to a Carnot engine running in reverse. (a) Show that the Carnot COP of the heat pump is COPC = 1/C where C is the Carnot efficiency of the heat engine. (b) If a...

A heat pump delivers 3 kW of heat to a house with a room temperature of 20 C. The heat pump condenser temperature is 40 C. 1 kW of power is input to the compressor. The evaporator temperature is -10...

Question 5 Question 1 An ideal Brayton cycle, operating between the pressure limits of 1 bar and 6 bar, has minimum and maximum temperatures of 300 K and 1500 K. The ratio of specific heats of the...

QSO 322 Acme Bicycle Case Study The purpose of this case study is to apply a number of the key concepts covered in the course textbook to a notional business case. Consider yourself the supply chain...

A house is maintained at a temperature TH by a heat pump that is powered by an electric motor. The outside air at TC is used as the low-temperature TER. Heat loss from the house to the surroundings...

ANSWER ALL QUESTIONS. WILL GIVE A GOOD RATING FOR A CORRECT ANSWERS ONLY 2-35E A spring whose spring constant is 200 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu,...

#6 and #7 1. Moist air at standard conditions is at a dry bulb temperature of 50F and a relative humidity of 70%. It is sensibly heated (constant moisture) to 72F. Use the psychrometric chart to...

5-180 Determine the power input for a compressor that compresses helium from 150 kPa and 20C to 400 kPa and 200C. Helium enters this compressor through a 0.1-m2 pipe at a velocity of 15 m/s. 5-181...

Car A and Car B are at the starting line of a race. At the green light, they both accelerate to 60 mi/h in 1 min. The graph at right represents their velocities in relation to time. a. Describe the...

A common-emitter amplifier circuit is shown in Fig. 4.152. Obtain the Thevenin equivalent to the left of points B and E. 12 V Re

Review and define each of the chapter's key terms.

Using the standardized regression equation of zy = rz x , find the predicted dependent variable z-scores of individuals with the following individuals if r = 0.72: a. z x = 4.0 b. z x = 2.9 c. z x =...

A senior executive of a public sector company recently quit his job under the VRS with a hefty packet of INR 1 Crore. Ms. Dhana-chor Chit Fund Company has offered the following investment scheme for...

Are any of the sugars in Problem 38 incapable of mutarotation? Explain your answer. Problem 38 (a) (-)-Threose; (b) (-)-allose; (c) (-)-ribulose; (d) (+)-sorbose; (e) (+)-mannoheptulose (Problem 34)....

From what physical and chemical characteristics of iron do we conclude that it is a metal? From what physical and chemical characteristics of sulfur do we conclude that it is a nonmetal?

Once a union is recognized, it acts as the exclusive representative for all workers in a bargaining unit, even if some of them do not want the union to represent them. Is this reasonable? Should...

What is the fundamental value of a financial instrument?

A point charge q1 = 4.00 nC is placed at the origin, and a second point charge q2 = -3.00 nC is placed on the x-axis at x = + 20.0 cm. A third point charge q3 = 2.00 nC is to be placed on the x-axis...

Four electrons are located at the comers of a square 10.0 nm on a side, with an alpha particle at its midpoint. How much work is needed to move the alpha particle to the midpoint of one of the sides...

Three point charges, which initially are infinitely far apart, are placed at the comers of an equilateral triangle with sides d. Two of the point charges are identical and have charge q. If zero net...

Calculate the correlation coefficient, r. Round your answer to three decimal places. Hours Spent Studying 0.5 1 1.5 2 2.5 3 4.5 5 5.5 6 Midterm Grades 60 63 69 72 75 78 87 93 96 99

need this done fast thanks 3. (Show yourWorkl) To the right, is a random sample of our classes last Exam scores. 57 87 102 a. Suppose the population mean mu, for the normally distributed variable, is...

New Assignment. Need some help and direction please. This is the scenario: Numerous accounts suggest that for many animals, including humans, direct stare from another animal is aversive (e.g. Cook...