Answered: A boat freezer is used to store fish at…

A boat freezer is used to store fish at -23°C. The freezer rejects energy at a rate of 3.5 KJ/s to the outside. The freezer needs 1000 W of electricity to operate. Determine:

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

See similar textbooks

Related questions

Q: A heat pump is used to meet the heating requirements of a house and maintain it at 20°C. On a day…

A: As per given Heat pump temprature=20°c Outside temperature =-2°c Heat loss by house =63000kj/h…

Q: A large heat pump should upgrade 4 MW of heat at 65 C to be delivered as heat at 145 C. What is the…

A: Given:T1=65οC=(65+273)K=338KT2=145οC=(135+273)K=418KQ1=5 MW

Q: Water vapor enters a compressor at a pressure of 100 kPa, a temperature of 100°C and a mass flow of…

Q: A heat engine with a thermal efficency of 45% rejects 500kJ/kg of heat. How much heat does it…

Q: A solar collector absorbed 40W/m2 heat from the atmosphere. This is equal to the convection brought…

A: Given data: Q=40 W/m2T1=40°CT2=80°C Need to determine the convective heat transfer coefficient.

Q: (example question from slides) A heat pump is to be used to heat a building during the winter. The…

A: Given:TH=21°C =294 KTL=-5°C =268 KQH=135,000 KJ/h

Q: For a power system operates with Wcycle = 810 BTU and Qout = 1769 BTU. What is the thermal…

A: Given data Work = 810 BTU Heat out = 1769 BTU Find the thermal efficiency of the system

Q: A heat engine, 325 kJ the heat 1000 K taking from an energy reservoir and 125 kJ waste heat 400 K It…

Q: A refrigerator should remove 400 kJ from some food. Assume the refrigerator works in a Carnot…

A: Given data: Total energy to be removed from food, Qt = 400 kJ. The temperature of the hot region,…

Q: A heat pump with a motor of 2 kW is used to keep a chicken hatchery at 30°C. This latter loses…

A: Given: The power of motor, W = 2 kW The temperature at the chicken hatchery, T1 = 30oC The heat loss…

Q: One of the Computer company in the US uses carnot heat pump to be used for heating its office and…

Q: A system is proposed to generate power from wastewater of 54C. If the ambient temperature is 23C,…

A: Highest thermal efficiency is given by ηmax = Work outputHeat input = Q1-Q2Q1 =…

Q: A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water…

A: Given dataInitial temperature T1 = 180CFinal temperature T2 100CCoeficient of performance COP =…

Q: An inventor draws 25000 kJ/h of heat from a heat well at -30°C, which requires 1.2 kW of power. He…

Q: A Carnot heat pump to heat a house in the winter and keep the interior temperature of the house at…

A: Given dataInterior temperature of house T = 250Out door temperature of of house To = 20CHeat loss…

Q: A 4-kW heat pump is operated by a peasant. It should keep a duck hatchery at 32 degrees Celsius,…

A: Given Data W= 4 kW Qh=10 kW

Q: The heat loss from a chicken coop (chicken house) is K(Tnside - Toutside) during the winter, where K…

Q: 2) The energy consumed by a shower for 30 days is 22kwh. It is known that the resistance of the…

A: To find: The value of time in minute. Given: The value of energy consumed is, 22 KWh. The value of…

Q: Qu A heat engine operates between 1625 C and 27 C and receives 400 kJ of heat. The maximum…

Q: The thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to…

Q: On a cold day, a homeowner uses a heat pump to absorb heat from the outside air at 15oF and…

Q: A bio-reactor is kept at 42°C by a heat pump driven by a motor of 2 kW. The reactor loses energy at…

A: We have to find What is the minimum ambient temperature for which the heat pump is sufficient?

Q: I need these 3 parts answered TRUE or FALSE.

A: Control frame has three compartments,Characteristic control compartment.Tolerance zone…

Q: A room is heated with a 1500-W electric heater. How much power can be saved if a heat pump with a…

A: w˙H=1500 WCOP=2.5

Q: A 45 MW thermal power plant, which receives 80 MW of heat from a thermal source of 440 ℃ terk,…

A: capacity of power plant (output) = 45 MW heat input to power plant = 80 MW Thermal…

Q: 1. During a cyclic process, a heat engine absorbs 500 J of heat from a hot reservoir, does work and…

A: Given:Heat engineheat absorbs, Q1=500 Jheat to sink, Q2=300 J

Q: An automobile engine operates with a thermal efficiency of 35%. Assumed machine car cooler (AC) has…

Q: A 2 kW, 40 litres water heater is switched on for 20 minutes. The heat capacity c, for water is 4.2…

A: Given:P=2 kWV=40 liters=0.04 m3t=20 min. or 1200 sCp=4.2 kJ/kg.K

Question

A boat freezer is used to store fish at -23°C. The freezer rejects energy at a rate of 3.5 KJ/s to the
outside. The freezer needs 1000 W of electricity to operate. Determine:
a) The refrigeration capacity of the freezer (i.e., the maximum amount of thermal energy that
can be added with the fresh fish), when the outside temperature is 30°C.
b) The coefficient of performance of the freezer.
c) The Carnot coefficient of performance of the refrigeration system (freezer).

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

The heat loss from a chicken coop (chicken house) is K(Tnside - Totside) during the winter, where K is 1.5 kW/K. The chicken coop temperature can vary between 15 °C and 25 °C without harming egg production. A heat pump with a coefficient of performance of 40% of that of a reversible heat pump is used to heat the chicken coop. What are the minimum power requirements if the outside temperature is -5 °C? .
A Carnot heat pump to heat a house in the winter and keep the interior temperature of the house at 25 ° C. is used. The heat losses of the house in a day when the outdoor temperature is 2 ° C are approximately 55000 kJ / hour. determined. If the heat pump is drawing 6.6 kW of power from the grid while it is running a) How many hours the heat pump has been running on the specified day (outdoor temperature is 2oC) b) By accepting that the electricity price is 0.085 dollars / kWh c) Calculate the cost of heating the same day if a direct electric heater was used.
A system is proposed to generate power from wastewater of 54C. If the ambient temperature is 23C, what is the highest thermal efficiency of this system in %?
Need asap
A bio-reactor is kept at 42°C by a heat pump driven by a motor of 2 kW. The reactor loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% that of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?
A refrigerator should remove 400 kJ from some food. Assume the refrigerator works in a Carnot between -15 C and 45 C with a motor compressor of 400 W. How much time does it take if this is the only cooling load
A heat engine, 325 kJ the heat 1000 K taking from an energy reservoir and 125 kJ waste heat 400 K It throws it into an energy reservoir. Meanwhile 200 kJ releases an energy Is the cycle that this heat engine runs on Reversible? Is it irreversible? Is it impossible? Why is that? b)An inventor -10°C with internal temperature 25°C Coefficient of activity between room temperature 8.5 a cooling with claims to run his machine. Could this claim be true? Why is that?
The inventor decides to lower the temperature of the low-temperature reservoir using a Carnot refrigerator. This refrigerator is powered by the heat engine itself, not an external source, consuming part of the work output of the heat engine. Let the high temperature reservoir be at Th, the original low temperature reservoir be at T₁, and the even-lower temperature achieved by the refrigerator be Tr. a) Find the ratio of the net (available) work to the heat Qh supplied by the high-temperature reservoir. [You do not need to worry about the process of lowering part of the reservoir to Tr. Assume that this has already been done, and the Carnot refrigerator only needs to remove as much heat from the T, reservoir as the heat engine is supplying.] b) It is possible to obtain a higher net efficiency this way?
For a power system operates with Wcycle = 810 BTU and Qout = 1769 BTU. What is the thermal efficiency?
A heat pump is used to maintain a space at 25 C during winter while the outdoor temperature is 10 C. The total rate of heat 1) loss from the space to the outside is 20 kW. The power (in W) needed to drive this heat pump (assuming it is reversible) is Select one: 806 1016 906 1006
I. 1. During a cyclic process, a heat engine absorbs 500 J of heat from a hot reservoir, does work and ejects an amount of heat 300 J into the surroundings (cold reservoir). Calculate the efficiency of the heat engine?
A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.