Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 44, Problem 7RQ
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The correct term for the given blanks.
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3. Generate the SFEE equations for the following process equipment with neat diagrams:
1. Air Compressor
2. Boiler
3. Shell & Tube Heat Exchanger
4. Evaporator
5. Condenser
6. Cooling Tower
01. A refrigerant 22 system having a refrigerating capacity of 55 kW
operates with an evaporating temperature of 5°C and rejects heat to water
cooled condenser. The compressor is hermetically sealed. The condenser
has a U value of 450 W/m².K and a heat-transfer area of 18 m? and
receives a flow rate of cooling water of 3.2 kg/s at a temperature of 30°C.
What is the condensing temperature?
11. Five large hotels in Miami, USA, use their own air-conditioning units, which
have a c.o.p. 3.1. It is proposed that the cooling systems of the five hotels be
substituted with a larger, modern unit that would have a c.o.p. 3.7. The total
installed capacity of the five hotels is 2,600 tons of air-conditioning and the
current systems are in use for 3,200 hours every year. Determine: a) the annual
energy savings from this substitution and b) the annual avoidance of CO₂
emissions if, currently, 72% of the electric energy in the Miami area is
obtained from coal power plants and 28% from nuclear power plants.
Chapter 44 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 44 - Geothermal heat pumps, or water-source heat pumps,...Ch. 44 - An important factor (or factors) involving water...Ch. 44 - Explain the ground loop or water loop of a...Ch. 44 - Explain the refrigerant loop of a closed-loop,...Ch. 44 - The__________loop is used to distribute heated or...Ch. 44 - True or False: Domestic hot water can be heated...Ch. 44 - Prob. 7RQCh. 44 - Antifreeze solutions that can be used in the...Ch. 44 - What is the main difference between a copper and a...Ch. 44 - A(n) ______well draws water from the top of...
Ch. 44 - Which of the following is a process in which a...Ch. 44 - The function of the pressure tank in an open-loop,...Ch. 44 - If 14 gpm of water is flowing through an open-loop...Ch. 44 - Explain the operation/purpose of the buffer tank...Ch. 44 - How will oversizing the buffer tank on a...Ch. 44 - Explain why a waterless, earth-coupled,...Ch. 44 - Explain how refrigerant and oil leakage are found...Ch. 44 - What kind of material is used in the waterless...
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- A house is heated and maintained at 20 °C by a heat pump. Part A Part B Based on these results, would you recommend heat pumps at locations with a severe climate? Match the words in the left column to the appropriate blankes in the sentences on the right. Reset Help mild 1. Given that a real heat pump is significantly efficient than a Carnot heat pump, the increases advantage of a heat pump over electric heating rapidly when the outside temperature becomes really low. less more 2. As the COP decreases, the heating power decreases 3. A heat pump is ideal for a climate. severe Submit Request Answerarrow_forwardTask 3 An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the temperature of the evaporator is -15 C. Given 300 kW of cooling load, determine the following: 1. Construct didactic sketches, showing the operating principles of a refrigeration system. 2. When you select a refrigerant for a certain application, what qualities would you look for in the refrigerant? 3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser. 4. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and their corresponding rate/power values in kW. 5. Estimate the COPR using thermodynamic tables 6. Calculate the COPR using the P-h chart and show the refrigeration cycle on the p-h chart. 7. Discuss the difference between your answers in 4 and 5 above and which one do you think is more accurate.arrow_forwardTask 3 An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the temperature of the evaporator is -15 C. Given 300 kW of cooling load, determine the following: 1. Construct didactic sketches, showing the operating principles of a refrigeration system. 2. When you select a refrigerant for a certain application, what qualities would you look for in the refrigerant? 3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser.arrow_forward
- Define the objective of a heat pump is to supply heat QH into the warmer space.arrow_forwardQUESTION 1 A manufacturer conducted an experiment for an evaporator capacity 533 kW cooling and designed for high COP of 1.8 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 608 kW, determine: Heat provided by the generator & absorber capacity in kW (equating overall heat balance of all heat exchanger). Show in the Solution Paper: Heat provided by the generator Provide in the Answer Box: Absorber Capacity in kW Answer in two decimal placesarrow_forwardWhy are HENs (Heat exchangers networks) much more challenging to design with just a single equipment unit?arrow_forward
- An electric motor drives a large air conditioner in a temperature controlled laboratory which handles all test samples for a major pharmaceutical company. There is no standby air conditioner, but there is a spare motor in the company’s stores. What classification would you assign to the air conditioner? Explain the reasoning behind your answer.arrow_forwardWhat are many different kinds and variations of the refrigeration cycle components؟arrow_forwardIt is based on the centralised production of chilled water and its distribution for a wide range of indoor air cooling purposes. Consumer Substation Thermal Energy Storage Tanks Hot Plate heat exchanger District Coolingarrow_forward
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