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 13RQ
The condensing pressure is 260 psig and the meteringdevice inlet temperature is 100°F for R-22. What is the total subcooling in this system?
A. 15°F
B. 20°F
C. 25°F
D. 30°F
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Air conditioner using R-22 works on the condensing evaporating
temperatures of 50 F and -30 F respectively. The C.O.P. of system is
equal to ( 4.855).
True
False
The 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°F
What’s the correct answer for this please ?
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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- A typical temperature relationship between a high-efficiency condenser and the ambient temperature is A. 10F. B. 20F. C. 30F. D. 40F.arrow_forwardIf the evaporating pressure was 76 psig for R-22 and the compressor inlet temperature was 65F, what would be the total superheat entering the compressor? A. 11F B. 21F C. 10F D. 20Farrow_forwardWhat happens to refrigerant heat in the condenser?arrow_forward
- How is the refrigerant cylinder pressure kept above the system pressure when a system is being charged with vapor from a cylinder?arrow_forwardA refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The evaporating temperaturc is -10°C and the condensing temperature is 42°C, determine the volume flow rate of refrigerant at inlet to the compressor. A. 35 L/s C. 25 L/s D. 55 L/s B. 45 L/sarrow_forwardUnder high evaporator heat loads , the temperature difference between the condenser and the ambient will be ? Higher Unpredictable Unchanged Lowerarrow_forward
- Air conditioner using R-22 works on the condensing and evaporating temperatures of 50 F and -30 F respectively. Therefore the C.O.P. of system is equal to (2.855) when the cycle is theoretical single stage. * True O Falsearrow_forwardAir conditioner using R-22 works on the condensing evaporating pressures of 99.36 psia and 19.62 respectively. The nv is equal to ( 60%) if m= 4% , Tcy= 20 F, y=1.3 and Ap= 1.2. True O Falsearrow_forwardSelect all the correct statements given below It is impossible to raise the temperature of cooling water above the condensation temperature in a condenser In an ideal Rankine Cycle, condensation takes place under isobaric and isothermal conditions In a surface condenser, condensation takes place at atmospheric pressure and temperature. A wet pump is used to remove excess cooling water in a surface condenserarrow_forward
- How to do a heat/energy balance on a anode fuel cell and a condenser given that the fuel cell is isothermal and the outlet of the condenser is 25 degrees?arrow_forwardEvaporative condenser is used only air as condensing medium to condense the hot vapour refrigerant. True O Falsearrow_forwardPlease answer ASAP. I will rate helpful thank you.arrow_forward
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