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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Chapter 40, Problem 14RQ
The compressor amperage of a 3-ton system operating on 230 V is approximately -A.
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17) What is the approximate Peritectic Temperature for the system?
46. Question
The capacity of a Freon 12 refrigeration system with a direct expansion evaporator
installed is 8.50 tonnes of refrigeration. Assuming that the refrigeration system is
operating under standard conditions of -15°C evaporation & 30"C condensation
the power to drive the compressor is 0.922 kw per tonne of refrigeration with a
system efficiency of 85%. Determine the compressor displacement.
The compressor work of an air compressor is 120kw. If piston displacement is 18m3/min, determine the mean effective pressure.
A. 400kpa B. 300kpa C. 500kpa D. 600kpa
Chapter 40 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 40 - The standard design conditions for...Ch. 40 - The typical temperature relationship between a...Ch. 40 - The evaporator will normally operate at a(n)...Ch. 40 - A typical temperature relationship between a...Ch. 40 - How is condenser high efficiency obtained?Ch. 40 - High-efficiency air-conditioning systems may use...Ch. 40 - What does the head pressure do If the suction...Ch. 40 - What will cause the suction pressure to rise?Ch. 40 - The evaporator design temperature may in some...Ch. 40 - The seasonal energy efficiency ratio (SEER)...
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- Three disadvantages of parallel compressor systems are _____, _____, and ____.arrow_forwardFor the purpose of acting as an air-cooled water chiller, an ammonia refrigerant vapor compression system is deployed. It is functioning with an evaporator temperature of 0 degrees Celsius and a condenser temperature of 40 degrees Celsius. The refrigeration produced by the system is equal to 15 tons.Find out: a. The temperature of the discharge and the mass flow rate of the refrigerant that is being circulated.b. The piston displacement that can be considered theoretical for the compressor.c. The work that can be done by the theoretical compressor.d. The heat that is not allowed to escape through the condenser.e. The Carnot coefficient of performance and the actual COP of the cycle.f. The volume of air that is supplied in the condenser if the air comes in at 30 degrees Celsius and exits at 34 degrees Celsius.g. The LMTD and AMTD of the condenser h. The water flow rate of the chiller assuming that the water enters the evaporator at 10 degrees Celsius and exits at 5 degrees Celsiusi. The…arrow_forwardChoose the symbol for Fixed displacement single rotation compressor. Select one: Ob. Oc. d.arrow_forward
- 10 m3/min of free air is to be compressed to 8 bar gauge in two stages. Assuming an intercooler pressure of 2 bar gauge and polytropic index of 1.3, what will be the flowrate at the exit of the intercooler ?Please choose correct option.a.4.295 m3/minb.312 litre/sec.c.3333 litre/mind.1172 litre/min.e.981 m3/minarrow_forwardBy using equations,show and explain why power required by compressor is higher when temperature at induction is higher than the ambient.arrow_forward5. The fluid horsepower of the system operating at 13790 kN/m² and delivering 19.1 L/min is. A. 438 Watt. B. 500 Watt. C. 460 Watt.arrow_forward
- 6. A two stage air compressor has an intercooler pressure of 300kpa. If the suction pressure is 100kpa, what is the discharge pressure? a. 130.57psi b. 130.57kPa c. 600psi d. 600kPa Please answer this immediately. Thank you!arrow_forwardChoose the symbol for Fixed displacement single rotation compressor. Select one: O a. Ob. c. Od.arrow_forwardthe highest pressure of water in the power plant cycle is located a. after the boiler b. at the turbine exit c. at the exit of condenser d. at the inlet of turbinearrow_forward
- 1. Pressure gauge the hydraulic cycle in figure -consist of:7 5 6 X LB ww M 3 Feed direction & tank O accumalator O intensifier O 3 way 2 position control valve Oarrow_forwardRefer to the Fe-C Diagram below to answer the following questions T(° C) 1600 1400 (Fe-C System) y +L IFe,C 1200 1148°C (austenite) www 1000 v + Fe,C 800 727°C a 600 a +Fe,C 400 5 C, wt% C 4 6. 6.7 (Fe) Fe,C(cementite)arrow_forward7)arrow_forward
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