Question: A heat engine is used to drive a heat pump. The waste heat from the heat engine and the heat transfer from the heat pump

A heat engine is used to drive a heat pump. The waste heat from the heat engine and the heat transfer from the heat pump are used to heat the water circulating through the radiator of a building. The thermal efficiency of the heat engine is 30% and the COP of the heat pump is 4.2. Evaluate the COP of the combined system, defined as the ratio of the heat transfer to the circulating water to the heat transfer to the heat engine.

Step by Step Solution

★★★★★

3.33 Rating (174 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

The efficiency of a heat engine is defined as And The heat pump u... 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)

861-ME-T (6960).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

A heat engine operates between two reservoirs at 800 and 20C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2C and...

A Carnot heat engine receives heat from a reservoir at 900C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27C. The entire work output of the heat engine is used to drive a...

A Carnot heat engine receives heat from a reservoir at 1700F at a rate of 700 Btu/min and rejects the waste heat to the ambient air at 80F. The entire work output of the heat engine is used to drive...

A reversible heat engine is used to drive a reversible heat pump. The power cycle takes in Q1 heat units at T1 and rejects Q2 heat units at T2. The heat pump extracts Q4 from a heat sink at T4 and...

The work output of a Carnot heat engine is used to drive an adiabatic air compressor as shown in the Figure below. The exit stream of the turbine is used as the heat sink for the heat engine. If the...

Q 1 : A Carnot heat engine receives heat at 7 0 0 K and rejects the waste heat to the environment at 3 0 0 K . The entire work output of the heat engine is used to drive a Carnot refrigerator that...

A combination of a heat engine driving a heat pump (see Fig. P5.114) takes waste energy at 50C as a source Q w1 to the heat engine, rejecting heat at 30C. The remainder, Q w2 , goes into the heat...

A Carnot engine operates between temperature levels of 3 9 7 C and 7 C and rejects 2 0 KJ / min to the environment. The total network output of the engine is used to drive heat pump which is supplied...

A combination of a heat engine driving a heat pump (see Fig P7.86) takes waste energy at 50C as a source Qw1 to the heat engine rejecting heat at 30C. The remainder Qw2 goes into the heat pump that...

A combination of a heat engine driving a heat pump (see Fig. P7.86) takes waste energy at 50C as a source Qw1 to the heat engine rejecting heat at 30C. The remainder Qw2 goes into the heat pump that...

14) Determine how many stretching modes are possible for ammonia. What are their symmetries, and how many are IR active? (4P)

Using the internet search engine of your choice (ex. Google), think about how you would start your own company with money you have saved. What would you do, as the leader of this start up, to promote...

A firm that is on a the verge of bankruptcy may be able to issues bonds, but A . no one will buy them B . they will have to offer a higjer intrest rate to do so C . they will have pay the same...

The table shows the mean (average) distances d of the planets from the sun (taking the unit of measurement to be the distance from the earth to the sun) and their periods T (time of revolution in...

Air enters a nozzle steadily at 200 kPa and 65C with a velocity of 35 m/s and exits at 95 kPa and 240 m/s. The heat loss from the nozzle to the surrounding medium at 17C is estimated to be 3 kJ/kg....

Reconsider Prob. 8 - 53. Using EES (or other) software, study the effect of varying the nozzle exit velocity from 100 to 300 m/s on both the exit temperature and exergy destroyed, and plot the...

Steam enters a diffuser at 10 kPa and 60C with a velocity of 375 m/s and exits as saturated vapor at 50C and 70 m/s. The exit area of the diffuser is 3 m2. Determine (a) The mass flow rate of the...

Question 1 Airbus, an airplane producer, offers the following deal to its customers (ie, airlines): "An airline that purchases a plane is awarded the right to sell it back to Airbus within 10 years...

At the beginning of the year, a firm has current assets of 396 and current liabilities of 287. At the end of the year, the current assets were 410 and the current liabilities were 327. What is the...

CONSTANT GROWTH Your broker offers to sell you some shares of Bahnsen & Co. common stock that paid a dividend of $2.00 yesterday. Bahnsen's dividend is expected to grow at 5% per year for the next 3...