FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
expand_more
expand_more
format_list_bulleted
Videos
Question
error_outline
This textbook solution is under construction.
Students have asked these similar questions
A refrigerator is connected to a generator powered by a fuel with a calorific value of 35000 kJ/kg and a density of 0.85 g/cm3 . The inside temperature of the refrigerator is 0°C, and the outside temperature is 20°C.
a. How much work is required to freeze 500 g of water?
ΔfreezingH° = 6.02 kJ mol– 1 )
b. How much internal energy change occurs during the process?
c. Since the generator consumes 5 L of fuel per hour, calculate the thermal efficiency of this engine.
Problem 2- Refrigeration
After returning from the store you place 4 bottles of water, 3 kg each, in the refrigerator. The
water is initially at 25 °C and needs to be cooled to 10 °C. The refrigerator has a COP of 1.8 and
a power input of 500 W. How long will it take for the refrigerator to cool the water? Is your
calculation realistic? Explain.
The ice maker inside a refrigerator makes ice cubes at 0.0°C from water that is at 17.2°C when it first enters the ice maker. If this machine is rated at 184 W and has a 2.96 coefficient of performance, what is the maximum amount of ice it can produce in a 24 hour period without any interruption or stoppage? Assume that the ice maker works just like a refrigerator. The specific heat of water is 4184 J/(kg · °C), and the latent heat of fusion of ice is 33.4 ✕ 104 J/kg.
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
- John decides to make ice using a Carnot refrigerator that takes heat from water at 0°C to a room at 30°C. Suppose 200 g of water at 0°C are converted to ice at 0°C by the refrigerator. Calculate the mechanical energy that must be applied to the refrigerator in J. The latent heat of fusion of water is Lf-3.34x105 J/kg. Remember the definition of the coefficient of performance K and first calculate K.arrow_forwardEvaluate whether this refrigerator is possible. The inside temperature is -10degC in the icebox. The ambient temperature is 25degC. It is claimed that the refrigerator actual COPref is 7.5. Is this machine possible, impossible, likely, and why?arrow_forwardAn inventor comes to you saying he has invented a refrigerator that maintains a room at 20F while operating in a location at 80F with a coefficient of performance of 8.5, is this possible?arrow_forward
- The temperature inside a Carnot refrigerator is8.34°C. What is the high temperature, Th, in Celsius needed to give this refrigerator a coefficient of performance of 9.43?arrow_forwardA 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?arrow_forwardplease show the complete solution thank you...arrow_forward
- Thermoarrow_forwardDiagram pleasearrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 30 kw. The actual C.O.P. of the refrigeration plant used is one third that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward
- Kentaja is volunteering with Doctors Without Borders, and is distributing the Maderna vaccine in Libya. She is in a region wheré the average Summer temperature is 104°F, but the Moderna vaccine must bé kept in a 50°F refrigerator for distribution. Kentaja remenmbers her Physics training and designs a refrigerator that uUseš retrigerant 12 and has a mass flow rate 0.004 kg/s that 'does the job. For Kentaja's refrigerator calculate : A.) Power input required by the compressor B.) Coefficient of performancearrow_forwardPineapple fruits with a mass of 500 kg are supplied to a cold storage at 20 C. The cold storage is maintained at 5 C and the fruits get cooled to a storage temperature in 10 hours. The latent heat of freezing is 105 kJ/kg and the specific heat of fruit is 1.256 kJ/kg.K. Find the refrigeration capacity of the plant.arrow_forward3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 28 kW. The actual C.O.P. of the refrigeration plant used is one fourth that of an ideal plant working between the same temperatures. Find the power required to drive the plant.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
The Refrigeration Cycle Explained - The Four Major Components; Author: HVAC Know It All;https://www.youtube.com/watch?v=zfciSvOZDUY;License: Standard YouTube License, CC-BY