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 43, Problem 8RQ
Which metering device is most efficient in heat pumps?
A. A thermostatic expansion valve
B. An automatic expansion valve
C. A capillary tube
D. An orifice or restrictor
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Which metering device is most efficient in heat pumps?A. A thermostatic expansion valveB. An automatic expansion valveC. A capillary tubeD. An orifice or restrictor
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Chapter 43 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 43 - How does a heart pump resemble a refrigeration...Ch. 43 - Name the three common sources of heat for heat...Ch. 43 - What large line connects the indoor unit to the...Ch. 43 - Why is the indoor unit not called an evaporator?Ch. 43 - When is the outdoor unit called an evaporator? A....Ch. 43 - The indoor coil is called a condenser during...Ch. 43 - Why is it important to have drainage for the...Ch. 43 - Which metering device is most efficient in heat...Ch. 43 - Where is the only permanent suction line on a heat...Ch. 43 - What type of drier may be used in the liquid line...
Ch. 43 - Where must a suction-line drier be placed in a...Ch. 43 - What controls the heat pump to determine whether...Ch. 43 - Can a heat pump switch from heating to cooling and...Ch. 43 - What must be done when frost and ice build up on...Ch. 43 - True or False: All heat pumps are practical...Ch. 43 - Why are scroll compressors more efficient than...Ch. 43 - Describe why variable-speed compressor motors are...
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- An automatic expansion valve system responds to an overcharge of refrigerant by A. low suction pressure. B. high head pressure. C. a flooded compressor. D. both B and Carrow_forwardWhen evacuating a refrigeration system that has solenoid valves, what special procedure must be followed?arrow_forwardWhich of the following statements is not true about orifice tube systems? The suction line must be cool to the touch from the evaporator outlet to the compressor. The liquid line from the condenser outlet to the evaporator inlet should be cool. The evaporator should feel very cold. The accumulator must be cool to the touch.arrow_forward
- The capillary tube metering device is usually fastened to the______for heat exchange. A. suction line B. compressor discharge line C. liquid linearrow_forwardWhy is a circulating brine system more attractive for ship refrigeration than individual evaporators?arrow_forwardQuality means _________ when referring to a refrigerant.arrow_forward
- Where must a suction-line drier be placed in a heat pump after a motor burnout?arrow_forwardChoose correct answer: The purpose of a capillary tube in a refrigeration system is to ___________ A. Reduce the pressure and not temperature B. Reduce the temperature and pressure C. Increase the temperature and pressure D. Reduce the temperature and not pressurearrow_forwardThe installation of a 31⁄2-ton central air-conditioning system needs thefollowing:1 compressor, condenser, and evaporator . . . . . . $1,142.001 concrete slab for condenser . . . . . . . . . . . . . . . $32.0021⁄2 pounds refrigerant R-134a charge . . . . . . . . . $1.20 per pound2 foot drainpipe (1-inch diameter) . . . . . . . . . . . . . $0.42 per foot30 foot connecting tubing . . . . . . . . . . . . . . . . . . . $0.79 per foot1 plenum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $47.501 roll duct insulation . . . . . . . . . . . . . . . . . . . . . . . $52.951 roll duct tape . . . . . . . . . . . . . . . . . . . . . . . . . . . $2.491 thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . $28.9535 foot thermostat wire . . . . . . . . . . . . . . . . . . . . . $5.95Labor (3 installers—8 hours each) . . . . . . . . . . . . $12.75 per hourarrow_forward
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