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 3, Problem 10RQ
If the evaporating pressure was 76 psig for R-22 and the compressor inlet temperature was 65°F, what would be the total superheat entering the compressor?
A. 11°F
B. 21°F
C. 10°F
D. 20°F
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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 effect does a slight amount of liquid refrigerant have on a compressor over a long period of time?arrow_forwardMost compressors are cooled using the ___________.arrow_forwardThe typical temperature relationship between a standard-efficiency air-cooled condenser and the ambient temperature is A. 50F. B. 40F C. 30F. D. 20F.arrow_forward
- Where must a suction-line drier be placed in a heat pump after a motor burnout?arrow_forwardThe evaporating pressure is 76 psig for R-22 and the evaporator outlet temperature is 58°F.What is the evaporator superheat for this system?A. 13°FB. 74°FC. 18°FD. 17°Farrow_forwardWhat are the intercooler pressure in a three stage compressor with suction pressure of 101.325KPa and final pressure of 2240KPa?arrow_forward
- Question#1 Pressure-enthalpy chart is another method to obtain an initial performance estimation of refrigeration/heat pump cycles used in heating, ventilation and air-conditioning (HVAC) system. Your role is to provide design and installation services for air -conditioning (AC) system a preliminary performance estimation. Given the following design specifications: Refrigerant HFC-134a as the working fluid - Ideal cycle operation condition is assumed - Cycle is operated at high pressure line of 0.8 MPa - Cycle is operated at low temperature line of – 10° C Flow rate is 0.1 kg/sec The head of the department in the company that you are working in asked you to make use of pressure -enthalpy chart provided for HFC-134a refrigerant Task.1 1. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and their corresponding rate/power values in kW.arrow_forwardQuestion#1 Pressure-enthalpy chart is another method to obtain an initial performance estimation of refrigeration/heat pump cycles used in heating, ventilation and air-conditioning (HVAC) system. Your role is to provide design and installation services for air -conditioning (AC) system a preliminary performance estimation. Given the following design specifications: Refrigerant HFC-134a as the working fluid - Ideal cycle operation condition is assumed - Cycle is operated at high pressure line of 0.8 MPa Cycle is operated at low temperature line of – 10° C Flow rate is 0.1 kg/sec The head of the department in the company that you are working in asked you to make use of pressure -enthalpy chart provided for HFC-134a refrigerant Task.1 2. Estimate the COPR 3. Determine the low-pressure line value.arrow_forwardIn an ideal vapour compression refrigeration cycle the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as Inlet of condenser 283. Exit of condenser 116 Exit of evaporator 232 What is the COP of the cycle?arrow_forward
- What’s the correct answer for this please ?arrow_forwardWhere must a suction-line drier be placed in a heat pumpafter a motor burnout?arrow_forwardan ammonia system supplies chilled brine for a 10 ton load at 0F, a 2 ton load at 20F, and 4 ton load at 35F and must operate at a -10F, suction temperature. Compare the theoretical power requirements with that for three separate F-12 compressors using direct expansion. Condesing os 80 F with 10F sub-cooling, saturared vapour enters the compressor.arrow_forward
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