Question 2: Refrigeration. IMPORTANT: (1) You need the R134a pressure-enthalpy (p-h) chart for answering this question. Question 2 - Section A: (i) With the aid of sketches, describe how an absorption refrigeration system works, explaining which components are at high pressure side and which components are at low pressure side of the system. (ii) List two working pairs used in absorption refrigeration, specifying the refrigerant and the absorbent in each of those working pairs. (iii) Briefly discuss two reasons why vapour absorption refrigeration systems are in popular use even if the co-efficient of performance (COP) of such systems can be very low. (iv) Why is it beneficial to have the refrigerant leaving the evaporator of a vapour compression refrigeration system to be at a superheated state?

Question 2: Refrigeration. IMPORTANT: (1) You need the R134a pressure-enthalpy (p-h) chart for answering this question. Question 2 - Section A: (i) With the aid of sketches, describe how an absorption refrigeration system works, explaining which components are at high pressure side and which components are at low pressure side of the system. (ii) List two working pairs used in absorption refrigeration, specifying the refrigerant and the absorbent in each of those working pairs. (iii) Briefly discuss two reasons why vapour absorption refrigeration systems are in popular use even if the co-efficient of performance (COP) of such systems can be very low. (iv) Why is it beneficial to have the refrigerant leaving the evaporator of a vapour compression refrigeration system to be at a superheated state?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter3: Refrigeration And Refrigerants

Section: Chapter Questions

Problem 2RQ: What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration...

See similar textbooks

Similar questions

What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?
The most popular refrigerant used in the past for residential air-conditioning is R- ________.
what are the instruments/materials used by scientist to study Thermoclines under water.
I. ESSAY/ ENUMERATION 1. GIVE ATLEAST 5 ADVANTAGES AND 5 DISADVANTAGES OF INORGANIC REFRIGERANTS. 2. HOW DOES A REFRIGERANT WORKS IN A REFRIGERATION SYSTEM? 3. DIFFERENTIATE POSITIVE AZEOTTROPES AND NEGATIVE AZEOTROPES IN TERMS OF THEIR APPLICATION IN REFRIGERATION SYSTEMS. 4. THE FOUR MAIN COMPONENTS OF A REFRIGERATION SYSTEM ARE COMPRESSOR, CONDENSER, EVAPORATOR AND AN EXPANSION VALVE. EXPLAIN BRIFLY THE FUNCTION OF EACH COMPONENT AND THE FLOW OF THE CYCLE.
VAPOR COMPRESSION REFRIGERATION SYSTEM ANALYSIS 3 Warm environment Он Condenser Expansion valve Evaporator QL Cold refrigerated space in Compressor 1 FIGURE 1: VAPOR COMPRESSION REFRIGERATION CYCLE The chiller system operates based on the vapour compression refrigeration cycle (figure 1) with a single stage compression. The isentropic efficiency of the compressor is assumed at 85%. The refrigerant exit evaporator and condenser can be assumed as saturated.
Q2 (a) Using appropriate sketches, draw a two-stage refrigeration system with a flash chamber. Explain briefly the function of flash chamber in this system.
O Falge QUESTION 2 The refrigerant undergoes a change of phase during the heat-transfer process, the pressure of the retrigerant is the saturation pressure during the low supply and low rejection processes. True False QUESTION 3 Frequently, the vapor of the liquid leaving the condenser is lower than the saturation temperature. O True False QUESTION & The pressure of the iquid leaveng the condenser we be less than the pressure of the vapor entarng, wd etempernd the retigerant in the condenser. O Te QUESTION S Are many situations in which it is desirable to combine three cycles in series, either power systems or refigertion sytems, to take advantage of a very wide temperature range or to utilize what would otherwise be waste heat to improve etficiency O true O False QUESTION 6 A cycle can't be made very efficient, since the temperature differences between the two fluid streams can be controlled through careful design of the combined system. True
Discuss unit of refrigeration.Elaborate the One ton of refrigeration and its benefits over other units of refrigeration?
So my chosen refrigerant is R-32. I'm having trouble finding a good range of pressure and temperature that takes the isentropic efficiency into account. I was using the software,EES, as my source of property retrieval since I couldn't find properties of R-32 anywhere else.
3. Explain the basic principles of the refrigeration process.
Elaborate the One ton of refrigeration and its benefits over other units of refrigeration?
Additional Instructions: Define each enthalpy obtained from tables and chart and draw the p-h diagram labeling the respective evaporating and condensing pressures and temperatures in each problem. Simple Vapor Compression Refrigeration System 53 PROBLEMS (1) An ammonia vapor refrigeration cycle operates at an evaporator temperature of-16 C and a condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal saturation eycle, (b) for wet compression with saturated vapor leaving the compressor, and (c) if the vapor at suction to the compressor is superheated 6 degrees. Ans. (a) 4.50, (b) 4.70, (e) 4.28