Question

In a heat pump, heat from the outdoors at -1.00 degrees C is transferred to a...

In a heat pump, heat from the outdoors at -1.00 degrees C is transferred to a room at 13.0 degrees C, with energy being supplied by an electric motor. How many joules of heat will be delivered to the room for each joule of electric energy consumed (ideally)?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Temperature of the room = Th = 13 oC = 13 + 273 K = 286 K

Temperature of the outdoors = Tc = -1 oC = -1 + 273 K = 272 K

Coefficient of performance of the heat pump = COP

Ideal heat pump is a carnot heat pump therefore we will take carnot coefficient of performance of the heat pump.

COP = 20.43

Electric energy consumed = Work done by the motor = W = 1 J

Heat energy delivered to the room = Qh

Qh = 20.43 J

Heat delivered to the room for each joule of electric energy consumed = 20.43 J

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A Carnot air conditioner takes energy from the thermal energy of a room at 55°F and...
A Carnot air conditioner takes energy from the thermal energy of a room at 55°F and transfers it as heat to the outdoors, which is at 90°F. For each joule of electric energy required to operate the air conditioner, how many joules are removed from the room?
The Bodø NATO base in northern Norway uses a heat pump to extract heat from ocean...
The Bodø NATO base in northern Norway uses a heat pump to extract heat from ocean water. 7.0∘C ocean water is continuously drawn into the system, heat is extracted, and the water is returned to the ocean at 3.0∘C. When the system is working at full capacity, 2000 kW of heat is delivered to the building at the cost of 600 kW of electric energy. a)How much energy is removed from the water (the cold reservoir) each second? b)What is...
An air conditioner (similar to a refrigerator taking thermal energy from the food placed inside it)...
An air conditioner (similar to a refrigerator taking thermal energy from the food placed inside it) takes its thermal energy from the room its in. If our air conditioner is a carnot air conditioner and it removes thermal energy from a 69 degree farenheit room and transfers it outside of your room, which is 101.4 degrees farenheit, how many joules are extracted from the room for each joule of electric energy? pls include a picture
Water is pumped by a motor-pump unit from a lake to a storage tank 17 m...
Water is pumped by a motor-pump unit from a lake to a storage tank 17 m above at a rate of 120 L/s. The storage tank is open to the atmosphere. The motor consumes 25 kW of electric power and the motor effciency is 95%. Disregarding any changes in kinetic energy of the water, determine (a) the overall effciency of the pump-motor unit, (b) the effciency of the pump and (c) the shaft power supplied by the motor to the...
There is a heat pump that operates with R 134ª refrigerant, whose compressor has a power...
There is a heat pump that operates with R 134ª refrigerant, whose compressor has a power of 5 kW. The heat pump condenser is used to heat oil from a temperature of 0 degrees Celsius, up to a temperature of 20 ° C, so the condenser operates with a condensation temperature of 40 ° C. Furthermore, the evaporator operating with an evaporation temperature of 5 ° C, it is desired to use to air conditioning from a temperature of 35...
(a) How much energy is needed to raise 1.00 kg of liquid water from 19.9 ?C...
(a) How much energy is needed to raise 1.00 kg of liquid water from 19.9 ?C to 99.9 ?C? (b) How much energy is needed to evaporate 1.00 kg of liquid water (at 100?C) into steam (at 100?C)? Be careful not to confuse J with kJ. (c) Is the relative size of these two numbers consistent with everyday experience that it takes much longer (e.g. maybe an hour or so) to boil away an entire pot of water than it...
A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at...
A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10.0 ∘C and expels it into the room at 28.0 ∘C. You put an ice-cube tray containing 385 g of water at 18.0 ∘C into the freezer. A. What is the coefficient of performance of this freezer? B. How much energy is needed to freeze this water? C. How much electrical energy must be supplied to the freezer to freeze the water? D. How...
Problem 16.20 A Carnot freezer that runs on electricity removes heat from the freezer compartment, which...
Problem 16.20 A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10.0 ∘C and expels it into the room at 28.0 ∘C. You put an ice-cube tray containing 385 g of water at 18.0 ∘C into the freezer. A. What is the coefficient of performance of this freezer? B. How much energy is needed to freeze this water? C. How much electrical energy must be supplied to the freezer to freeze the water?...
How much heat must be removed to make ice at -10 degrees C from 2kg of...
How much heat must be removed to make ice at -10 degrees C from 2kg of water at 20 degrees C (The latent heat of fusion for water is.25X10^5 J/kg. The specific heat of water is 4190 J/kg K and for ice is 2090 J/kg K.) a. 7.95 X10^5 b. 8.37 X10^5 c.8.75 X10^5 d. 2.09x10^5
(a) How much energy does it take to heat 250 g of water from 20 ◦C...
(a) How much energy does it take to heat 250 g of water from 20 ◦C to the boiling point of 100 ◦C? (The specific heat of water is 4190 J/kg · K) (b) (Suppose you wanted to cause the temperature change in part (a) by using an 800W microwave. If we assume all the power delivered by the microwave goes into the water, how long will it take for the water to change temperature? (c) The heat of vaporization...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT