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 3, Problem 19RQ
What is adiabatic expansion?
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Specific Heat Problems:
a. The boiler in a canteen contains 6.75 kg of water at 10°C. How much
heat energy is required to raise the temperature of the water to
105°C? Specific heat of water = 4187 J/kg-K.
b. How many kilograms of copper can be raised from 17°C to 90°C by
the absorption of 80 kJ of heat energy? Specific heat of copper = 390
kJ/kg-K.
Subject : Thermofluid
A Carnot heat engine is operating between a source at TH and a sink at TL. If it is desired to double the thermal efficiency of this engine, what should the new source temperature be? Assume the sink temperature is held constant.
6. An accumulator has a working pressure range of 135 bar to 210 bar. Assume that the
atmospheric pressure is 1 bar. The accumulator must have a working volume of 3.00
liters. Use both adiabatic (k = 1.4) and isothermal (k = 1.0). How large must the
accumulator be to accomplish this task? Give your answer in Liters. Assume that the
precharge pressure is 100 bar. All pressures listed in the problem, except the atmospheric
pressure are gage pressures.
Chapter 3 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 3 - Name three reasons why ice melts in an icebox:...Ch. 3 - What are the approximate temperature ranges tor...Ch. 3 - One ton of refrigeration is A. 1200 Btu. B. 12,000...Ch. 3 - Describe briefly the basic refrigeration cycle.Ch. 3 - What is the relationship between pressure and the...Ch. 3 - What is the function of the evaporator in a...Ch. 3 - What does the compressor do in the refrigeration...Ch. 3 - Define a superheated vapor.Ch. 3 - The evaporating pressure is 76 psig for R-22 and...Ch. 3 - If the evaporating pressure was 76 psig for R-22...
Ch. 3 - Define the term subcooled liquid.Ch. 3 - The condensing pressure is 260 psig and the...Ch. 3 - The condensing pressure is 260 psig and the...Ch. 3 - What is meant by a saturated liquid and vapor?Ch. 3 - What is meant by desuperheating a vapor?Ch. 3 - What happens to the refrigerant in the condenser?Ch. 3 - What happens to refrigerant heat in the condenser?Ch. 3 - The metering device A. cycles the compressor. B....Ch. 3 - What is adiabatic expansion?Ch. 3 - Describe flash gas, and tell how it affects...Ch. 3 - Quality means _________ when referring to a...Ch. 3 - Describe the difference between a reciprocating...Ch. 3 - List the cylinder color codes for R-12, R-22,...Ch. 3 - Define enthalpy.Ch. 3 - Define a pure compound refrigerant, and give two...Ch. 3 - Define net refrigeration effect as it applies to...Ch. 3 - Define heat of compression, and explain how it is...Ch. 3 - Define flash gas, and explain how it applies to...Ch. 3 - Define temperature glide as it pertains to a...Ch. 3 - Define a zeotropic refrigerant blend, and give an...Ch. 3 - Define a near-azeotropic refrigerant blend, and...
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- What are mullion heaters?arrow_forward3.) When a gas surrounded by air is compressed or expands adiabatically, its temperature rises or decreased even though there is no heat input or dissipated to the gas. Where does the energy come from to raise or lower the temperature? 4.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in?arrow_forwardAaBbCcDd AaBbCcDd AaBbC AaBbCcC AaB AaBbCcD AaBbCcDd AaBb I Normal 1 No Spac. Heading 1 Heading 2 Title Subtitle Subtle Em. Emp- Paragraph Styles There is a hot water source in New Delhi.Our plan is to use this heat source for heating and hot water supplies of a site of 100 hostels. The outlet temperature of the water from the source is 170°C. 4- An official realizes that the outlet temperature of the groundwater is too high and is considering using it to generate electricity. Design an Organic Rankine Cycle (ORC) suitable for this purpose. (Ctrl)arrow_forward
- 2-What is the principle work of the thermocouples?arrow_forward5. A refrigerator with tetrafluoroethane as refrigerant operates with an evaporation temperature of 247.15 K (-26°C) and a condensation temperature of 300.15 K (27°C). Saturated liquid refrigerant from the condenser flows through an expansion valve into the evaporator, from which it emerges as saturated vapor. (a) For a cooling rate of 5.275 kW, what is the circulation rate of the refrigerant? (b) By how much would the circulation rate be reduced if the throttle valve were replaced by a turbine in which the refrigerant expands isentropically? (c) Suppose the cycle of (a) is modified by the inclusion of a countercurrent heat exchanger between the condenser and the throttle valve in which heat is transferred to vapor returning from the evaporator. If liquid from the condenser enters the exchanger at 300.15 K (27°C) and if vapor from the evaporator enters the exchanger at 247.15 K (-26°C) and leaves at 294.15 K (21°C), what is the circulation rate of the refrigerant?arrow_forwardExplain the following types of processes with one example of each - isothermal, isobaric, isochronic, adiabaticarrow_forward
- Elaborate the One ton of refrigeration and its benefits over other units of refrigeration?arrow_forwardAn electric fan transforms _____________ energy into _____________ energy. Electrical; Heat Electrical; Mechanical Heat; Mechanical Mechanical; Electricalarrow_forwardwhat are the different type of Boilers?arrow_forward
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