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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Textbook Question
Chapter 23, Problem 9RQ
Describe the reciprocating compressor piston, rod, crank-shaft, valves, valve plate, head, shaft seal, internal motor overload device, pilot-duty motor overload device, and coupling.
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2. Which of the following equations describes the chocked nozzle thrust in a gas turbine engine?
W₁.hc=
= (W₂ +W₂).ht.nm
O FN = (Co-Co).W₂ + (p9 - Po).A9
W = Wair + W fuel - Wbleed
gas
hc = cp.(CPR(7-1/7)-1)/hic
O FN = (C9 - Co). Wa
8. Draw the graphic symbol for a two-position spring centered valve, a spring offset
valve, an energize-to-center valve.
5. A Wankel engine (Figure 12-16) uses triangular rotors in a specially shaped combustion chamber to replace
the traditional piston and cylinder. As the rotor turns, each of its three sides goes through a four-step cycle.
During the intake
stroke, fresh air is
mixed with fuel
as it is drawn into
the engine. The
rotor then seals
off the fuel-air
mixture and com-
Figure 12-16
Problem 12-5
Intake
Compression
Power
Exhaust
mences to com-
press it. In the
power stroke, the spark plug ignites the mixture. The burning gases expand, adding momentum
to the rotor. As the rotor completes its cycle, the burned gases leave the engine through the ex-
haust port, and the cycle begins over again.
From the above description of a Wankel engine, identify the four thermodynamic processes that drive this
device. Can you identify the cycle (Otto, Diesel, Carnot, and so on)?
Chapter 23 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 23 - Describe the operation of a compressor.Ch. 23 - Name five types of compressors.Ch. 23 - True or FAlse: A compressor can compress a liquid.Ch. 23 - What would be considered a higher-than-normal...Ch. 23 - Which compressor type uses pistons to compress the...Ch. 23 - Which compressor type uses tapered, machined gear...Ch. 23 - Which style of compressor uses belts to turn the...Ch. 23 - What would be done to increase the compressor...Ch. 23 - Describe the reciprocating compressor piston, rod,...Ch. 23 - Name two things in the design of a reciprocating...
Ch. 23 - At what speeds in rpm does a hermetic compressor...Ch. 23 - What effect does a slight amount of liquid...Ch. 23 - What lubricates the refrigeration compressor? A....Ch. 23 - What can the service technician do to keep the...Ch. 23 - State the main advantage that a discus...Ch. 23 - Briefly describe how the scroll compressor...Ch. 23 - List four main advantages a scroll compressor has...Ch. 23 - What are two main reasons why a compressor should...Ch. 23 - Briefly describe how the digital capacity control...Ch. 23 - List the three main advantages of having digital...Ch. 23 - Prob. 21RQ
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- State the main advantage that a discus compressor's valve plate design has over a conventional piston-type compressor.arrow_forward2. Which of the following equations describes the chocked nozzle thrust in a gas turbine engine? O FN=(co-co). Wa FN = (C9 - Co). Wa + (p9 - Po).A9 W. = Wair+Wfuel - Wbleed gas hc = cp.(CPR(1-1/)-1)/hic Wa.hc = (Wa+W+).ht.nm Dikdörtgen Biçinarrow_forwardIn a pressure regulator, the ________ is attached to one end of the poppet to provide a surface for the spring to push on.arrow_forward
- List out the design requirements of diesel engine combustion chamberarrow_forwardCompression takes place on both sides of the piston in two cylinders is known as a. single stage double acting b. multistage double acting c. multistage single acting d. single stage single actingarrow_forwardWhat is the pressure in the inlet? (Note: You cannot relate directly what is in the inlet section towards the exit/exhaust section, but: Inlet to Throat to Exit Section)arrow_forward
- The shop test of a single-acting, 8" x 12" engine whose record is hereby reported was made for the heat balance. Engine: Indicated mean effective pressure = 155 psi Speed = 720 rpm Mechanical efficiency = 80% No. of cylinder:6 No. of stroke:4 Cooling water: Capacity of cooling pump = 98 gpm Temperature of inlet water = 131 F Temperature of outlet water = 152 F Fuel: Fuel oil: C12H30 Fuel temperature = 75 F Hydrometer test of fuel oil, SG = 0.945 Gas: Exhaust loss = 15,000 Btu/min Temperature of exhaust gas = 752 F Specific heat of exhaust gas = 0.26 Btu/lb-F Temperature of air = 80 F Radiation, friction and unaccounted for loss = 2000 Btu/min Calculate the percent excess air (%) required by the engine.arrow_forwardDraw schematic diagrams of a gas turbine system used for i. generating electricity with irreversible (actual) single stage compression, ii. two stages of irreversible expansion with reheat, and iii. a regenerator. Specify the relevant corner points of the process.arrow_forwardThe type of impeller used in the blower experiment is a. Open type straight vanes b. closed type of vanes c. forward type vane d. Backward type vanearrow_forward
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