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 12RQ
The condensing pressure is 260 psig and the condenser outlet temperature is 108°F for R-22. By how many degrees is the liquid subcooled in the condenser?
A. 12°F
B. 42°F
C. 7°F
D. 14°F
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Find the following:
a. Enthalpy of the steam in kJ/kg entering the condenser
b. Enthalpy in kJ/kg of the condensate
c. Enthalpy in kJ/kg of the feed water
What are the difference of chilled liquid and condenser water?
The food storage room requires a refrigeration system with a capacity of 15 tons of refrigeration which operates at an evaporator temperature of -17.5 ° C and a condenser temperature of 37.0 ° C. The refrigerant used is R-134a and the system operates at saturated conditions.
A. COP = Answer.
b. Refrigerant flow rate = Answerkg / s.
c. Heat loss rate in condenser = AnswerkJ / sec.
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_forwardWhat happens to refrigerant heat in the condenser?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
- Most condensers will subcool the refrigerant to between ____F below the condensing temperature of the refrigerant. A. 0 and 5 B. 5 and 10 C. 10 and 20 D. 20 and 30arrow_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_forwardAfter heat is absorbed into a condenser medium in a water-cooled condenser, the heat can be deposited in one of two places. What are they?arrow_forward
- When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.arrow_forwardFour methods for controlling head pressure in an air-cooled condenser are ______, ______, _______, andarrow_forwardThe condensing pressure is 260 psig and the meteringdevice inlet temperature is 100F for R-22. What is the total subcooling in this system? A. 15F B. 20F C. 25F D. 30Farrow_forward
- An R-404A system is operating with a -50F evaporator and the condenser is operating at 115F. What is the compression ratio of this system? A. 16.9 to 1 B. 17.8 to 1 C. 19.1 to 1 D. 21.33 to 1arrow_forwardWhere is the only permanent suction line on a heat pump?arrow_forwardThe food storage room requires a cooling system with a capacity of 15 tons of refrigeration that operates at an evaporator temperature of -17.5 ° C and a condenser temperature of 37.0 ° C. The chiller used is R-134a and a system that operates at saturated conditions. A. COP = b. Refrigerant flow rate = kg / s. c. Heat loss rate in the condenser = kJ / s.arrow_forward
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