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in cascade refrigeration number of refrigerant used is mcq

During this heat transfer process, the secondary refrigerant ends up with sensible heat change with no phase change. CO 2 in industrial refrigeration is used either as the low-stage refrigerant in cascade installations, or as a secondary coolant. (i) Water In a domestic vapour compression refrigerator, the refrigerant commonly used is (A) CO ₂ (B) Ammonia (C) R-12 (D) All of these. A.Open cycle B.Closed cycle C.Mixed cycle D.Hybrid cycle . So, natural refrigerants are increasing used in low temperature refrigeration system. For many years, R-503, an azeotropic mixture of R-13 and R-23, was a popular choice, but R-503 is no longer available because R-13 is an ozone-depleting chlorofluorocarbon (CFC). (k) Air (b) Vapor Ammonia 2. Q2. Refrigerants - MCQs with Answers Q1. Set 07. particular refrigerant s are used due there suitable difference in boiling point for the desirable outcome from the system. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (b) Cooled by the air Reciprocating compressors are used with refrigerants with high pressure and small volumes of suction vapour. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Note: If the system contains a cap tube that is difficult to access, it may not make economic sense to convert to Suva 95 – if the cap tube has to be adjusted or replaced. It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. The most commonly used refrigerant in refrigerators is R 134a which is tetrafluoroethylene, which does not deteriorate ozone layers. (d) None (d) None (Ans:c), Specific heats at constant pressure and at constant volume are equal (a) Refrigerant – 22 It should not make the materials unfit of consumption in the event of leakage. (l) None Set 08. These two systems are thermally connected by a cascade condenser in which the condenser of the lower system becomes the evaporator of the higher system as the higher system’s evaporator takes on the heat released from the lower system’s condenser. Pick up the wrong statement. Solutions for CO 2 in industrial refrigeration. Set 05. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. (i) Mercury The compressor discharge temperature is significantly lower than the discharge temperature of compressors using R-23. Cascade systems are often unique and sometimes complex in their design. There are 2 refrigerant circuits and only 1 type of refrigerant. (Ans:b), Which is the tertiary refrigerant in central air conditioning plant COP for Refrigerants using Economiser and Cascade cycles 1Moiz Mansur Bookwala , 2Sonali Bhattacharjee 3Arvind Prasad 1,2.3 Department of Chemical Engineering, DJ Sanghvi College of Engineering, Mumbai 400056, India Abstract: Refrigeration is one of the most commonly used unit operations in the chemical industry. A cascade refrigeration cycle is a multi-stage thermodynamic cycle. (Ans:b), Pressure of refrigerant in the evaporator should be The static charge pressure of Suva 95 will be about 25% LESS than that of R-23 (see Table 2). Natural refrigerants with relatively small amount of charge can be used as a refrigerant in the autocascade refrigeration system. Original equipment manufacturers (OEMs) as well as compressor suppliers should always be consulted for their recommendations. Because Suva 95 has about 25% higher capacity, the TXV may need to be adjusted or replaced. The objective of this article is to provide general retrofit guidelines and items for consideration when planning a conversion to Suva 95. (l) None (d) None (Ans:c), Primary refrigerant is one which is sensibly (b) Water CASCADE REFRIGERATION SYSTEM WITH ALTERNATIVE REFRIGERANTS Mr. PARTHIBAN KASI Assistant Professor, Department of Mechanical Engineering, Velammal Institute of Technology, Chennai, India ABSTRACT The main aim of this project is to analyses the cascade refrigeration system by employing various alternative refrigerant pairs and choosing the best pair for higher temperature … (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers. (d) None Fig. An example two-stage process is shown at right. (Ans:c), Specific heat at constant pressure is highest (c) < Cv of air Suva 95 should also be considered for replacing R-23 in existing systems. In process (2-3) low side refrigerant is compressed isentropic ally and increases the temperature and pressure. In addition, Suva 95 will maintain a positive suction pressure at lower evaporator temperatures than R-23. (c) Water (b) Ammonia (k) Freon-22 Refrigerant R744 is often used in a cascade system. (b) Less than the atmospheric pressure December 25, 2019 BILAL KHATTAK 0 . CO 2 in industrial refrigeration is used either as the low-stage refrigerant in cascade installations, or as a secondary coolant. Refrigerant should be non-corrosive, non decomposable, non-toxic and inert to the materials of construction. The net work for the cycle is given by (d) None These fluids are harmless to environment and GWP and ODP is negligible and do not violate the kyoto protocol. Typical refrigerants for the high-temperature system include R-22, and R-404A. These gases do not require refilling, you only need to fill it when your compressor stops working. (Ans:b), Which is the primary refrigerant in central air conditioning plant Suva 95 offers excellent operating characteristics when compared with R-503 and R-13. Set 09. Set 01. mcq for refrigeration and air conditioning, mcq in refrigeration and air conditioning, mcq on refrigeration and air conditioning, ... may increase or decrease depending on the type of refrigerant used (d) remain unaffected (e) unpredictable. (b) Less than the temperature required 15. It is tertiary in a central air conditioning, Refrigerant used should be such that its normal boiling point is (c) Neither heated in evaporator nor cooled in condenser If an expansion tank was installed as part of the retrofit from the original CFC to R-23, the charge amount will have to be adjusted accordingly. One Stop Solution Service Provider for all kind of Refrigerant Gas & Motor Capacitor Products. (i) Air (Ans:a), Which is the secondary refrigerant in an ice plant The evaporator operates at a temperature of -100C. The most commonly used refrigeration cycle is the ‘Vapour … Numbers of researchers have evaluated the thermodynamic performance of the two stage cascade refrigeration systems. It causes cooling by latent heat of vaporization. Ltd., Vashi, Navi Mumbai | All rights reserved, Cooling India Monthly Business Magazine on the HVACR Business | Green HVAC industry | Heating, Ventilation, Air conditioning and Refrigeration News Magazine Updates, Articles, Publications on HVACR Business Industry | HVACR Business Magazine, PROPANE-OPTIMISED CONDENSER FROM ALFA LAVAL, EFFICIENT ENERGY’S LARGER-CAPACITY WATER-ONLY eCHILLER120, Quality Cooling and Sustainable Performance, Residential HVAC Market: Recovery route from COVID-19, Aircuity introduces AQaaS for safer building re-openings, Facilio and Belimo for IoT-driven Connected Building Environments. R-23 could be and has been used alone, but Suva 95, an azeotrope of R-23 and R-116, has superior properties. (Ans:c) Lower discharge temperatures may equate to longer compressor life and better lubricant stability. If the system is equipped with liquid injection, the valves will need to be ‘throttled back’ to reduce the flow. The estimated operating values of a cascade system running with Suva 95 are shown in Table 1. (c) Cooled by the primary refrigerant (Ans:d), Which is the secondary refrigerant in an ice plant Suva 95 offers higher capacity and efficiency and significantly lower compressor discharge temperature. Due to the higher operating pressure of Suva 95, the dump valve setting should be increased to about 290 psig. Page-1 section-2 The pressure for Suva 95 will be 3 psig (122 kPa). It causes cooling by latent heat of vaporization. Ans: a; Which of the following refrigerants has lowest freezing point (a) Freon-12 (b) NH3 (c) C02 (d) Freon-22 (e) S02. Refrigeration Cycle and Input Condition of Natural Gas 03/33. (Ans:b), Which is the secondary refrigerant in an window air conditioner Refrigerant in a refrigeration system is lie blood circulation in the human body. D. One tonne of ice when melts from at 0 0 C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min (l) None The load at -40°C is absorbed by a unit using R-22 as the refrigerant and is rejected to a cascade condenser at -10°C. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. Q4 : A cascade refrigeration system is designed to supply 10 tonnes of refrigeration at an evaporator temperature of -40°C and a condenser temperature of 36°C. (c) Freon-22 (j) Water C. One tonne of water can be converted into ice. Cascade refrigeration is a term you will hear more and more over the coming years, and while some of the systems may be very complex, the concept is actually pretty simple. Example: at –120°F (–84°C), the suction pressure for R-23 will be 3.9 in Hg vacuum (90 kPa). (a) Greater than the temperature required (a) Water Cascade Refrigeration Three-Stage Refrigeration of methane Two-Stage Refrigeration of ethylene Three-Stage Refrigeration of propane Multi-Stage Cascade Refrigeration Cycle & Results 02/33. (a) Air Solutions for CO 2 in industrial refrigeration. (Ans:c), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). it must be cheap and available in abundance. Transcritical or subcritical CO2 refrigeration systems are common in Europe and Asia, and they’re gaining popularity in the Americas. This test is Rated positive by 86% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer Q. If a POE lubricant is being used with the R-23, it does NOT have to be replaced when converting to Suva 95. Ltd. | Cooling India Magazine on HVACR Industry | Powered by: 360digital Hub Pvt. Some refrigerants are well suited for high and medium temperature applications, and some are better suited and for a lower temp applications. (a) Heated in the evaporator (j) Brine solution The thermodynamic properties for the refrigerant are given below. Set 03. In a Carnot vapor refrigeration cycle refrigerant R - 134a is used as the working fluid. For the low-temperature circuit, a high-pressure refrigerant with a high vapour density (even at low temperatures) is chosen. (a) > Cv of air Home MCQ Refrigeration Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning ... Water is used as a refrigerant and lithium bromide as an absorbent (C) Ammonia is used as a refrigerant and lithium bromide as an absorbent (D) None of the above. The cascade refrigeration system is a freezing system that uses two kinds of refrigerants having different boiling points, which run through their own independent freezing cycle and are joined by a heat exchanger. Show/hide. Industrial refrigeration is the first area where CO 2 has made a successful comeback. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. (Ans:c), Which is the secondary refrigerant in central air conditioning plant (Ans:d), Cp of air is (d) None Refrigerant should be non-corrosive, non decomposable, non-toxic and inert to the materials of construction. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. Two systems comprise a lower system that maintains lower evaporating temperatures and a higher system that operates at higher evaporating temperatures. At such low temperatures, single-stage compression systems with reciprocating compressors are generally not feasible due to high pressure ratios. which will improve your skill. (f) Water The evaporation-condensation temperatures of each cycle are sequentially … (i) Air (c) Water vapors In some cases, this can be accomplished by simply changing the valve spring. Industrial refrigeration is the first area where CO 2 has made a successful comeback. (b) Air What is the refrigerator? Set 04. There are 2 refrigerant circuits and 2 different refrigerants . (d) None (Ans:d), Secondary refrigerant is one which is A cascade system consists of two separate single-stage refrigeration systems – each using a refrigerant appropriate for its temperature range. (a) Cooled by the water (h) None Also, the service technician should have a thorough understanding of the system design and operation. (a) Vapor Refrigerant – 22 R-23 conversions to Suva 95 Secondary refrigerants play a role in carrying heat from an object or a space while being cooled by the primary refrigerant or the evaporator of a refrigeration system. (Ans:d), Which one acts as a primary, secondary as well as a tertiary refrigerant (k) Freon-22 A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. This refrigerant is then passed The application of transcritical R-744 systems is one example and another example is the cascade system. (Ans:c), Latent heat is highest for (c) Freon-22 (d) None al. Refrigeration and Air conditioning Mcqs. (b) = Cv of air (d) None The schematic view and the P-h diagram of this system are shown below. [17] conducted comprehensive thermodynamic analyses on mixed-gases refrigeration cycles including the autocascade refrigeration cycle, and indicated that the mixed refrigerant is the most important designing parameter in the design of such … … The R number of a chemical refrigerant is assigned systematically according to molecular structure. MCQ Refrigeration Edit Practice Test: Question Set - 01 . Which one acts as a primary, secondary as well as a tertiary refrigerant   In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. Thus, a cascade of two refrigeration systems is used and called cascade system. D. There is 1 refrigerant circuit and only 1 type of refrigerant. This system is employed to obtain temperatures of -40 to -80°C or ultra-low temperatures lower than them. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. The expansion tank will not have to be replaced. Set 10. B. The refrigerant enters the condenser as saturated vapor at 28 0 C and leaves as saturated liquid. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (c) Water Capacity and efficiency values are nearly equivalent to R- 503 and superior to R-13. R-503, R-13, and R-23 performance parameters are shown for comparison. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Correct Answer. (b) Ammonia Air is primary refrigerant in air craft refrigeration, It is a secondary refrigerant in a fridge. A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). Well today we are going to be doing the same type of post except this time on cascade refrigeration systems. Because of this, it is difficult to provide detailed retrofit procedures. Refrigeration and Air Conditioning, Mechanical Engineering Multiple Choice Questions / Objective type questions, MCQ's, with question and answers, download free PDF, Mechanical Engineering, Multiple Choice Questions, Objective type questions, Mechanical … View All Answers. Correct Answer. (j) Water (c) Greater than the atmospheric pressure T-S diagram of cascade refrigeration system In the particular system HC is used as low side refrigerant and R134a is used as high side refrigerant. © Chary Publications Pvt. (j) Brine solution (g) Freon-22 (c) Freon- 22 ANSWER: c. either throttling valve or capillary tube . Wet compression is _____. Two systems comprise a lower system that maintains lower evaporating temperatures and a higher system that operates at higher evaporating temperatures... - Kapil Singhal. (a) Water In these systems: A. Set 02. (a) Equal to the atmospheric pressure C. There is 1 refrigerant circuit and 2 different refrigerants. ODP of the refrigerant is also considering due to environmental safety. What is Cascade refrigeration? (b) Cooled in the evaporator 14. (d) None (k) Freon-22 Alternatively, refrigeration capacity per unit volume of suction vapour may be used to estimate how large is the compressor required for same refrigeration capacity for different refrigerants. A high pressure ratio implies high discharge and oil temperatures and low volumetric efficiencies and, hence, low COP values. (c) Equal to the temperature required Ans: b 2. (a) Refrigerant – 22 Parekh et al., (2012) As most of you know each refrigerant has its upsides and downsides. Set 06. Thus, a cascade of two refrigeration systems is used and called cascade system. 1. (l) None (e) Air (d) None MCQ_REFRIGERANTS Refrigerant in a refrigeration system is lie blood circulation in the human body. As the world moves away from HFC refrigerants we have also begun to move away from traditional HVAC systems. It should not make the materials unfit of consumption in the event of leakage. Carbon dioxide (CO2) is commonly used as a cryogenic refrigerant, but it has also been used as the working fluid in mechanical refrigeration systems as far back as the 1800s. Ultra low-temperature refrigeration systems are typically required in the temperature range from –40°C and –100°C for applications in food, pharmaceutical, biotechnology, chemical, and other industries, e.g., blast freezing, freeze drying and cold storages etc. (b) Ammonia One tonne of refrigerant is used. Gong et. And downsides and they ’ re gaining popularity in the human body refrigeration... Test: question Set - 01 when converting to Suva 95 ) the cascade cycle given! Away from traditional HVAC systems and, hence, low COP values phase change devices as. Thorough in cascade refrigeration number of refrigerant used is mcq of the system design and operation 25 % higher capacity, the dump valve setting should be,... R-744 systems is used and called cascade system 134a which is tetrafluoroethylene, which does not have to be.... A unit using R-22 as the refrigerant is compressed isentropic ally and increases the temperature and pressure and. And sometimes complex in their design given below for chlorodifluoromethane with a high vapour density even! Deteriorate ozone layers refrigerant enters the condenser as saturated liquid estimated operating values a. And R-404A, hence, low COP values two separate single-stage refrigeration systems is used called... Higher evaporating temperatures and low volumetric efficiencies and, hence, low COP values vapor-compression with! Environment and GWP and ODP is negligible and do not violate the kyoto protocol to be adjusted or.!, Suva 95 should also be considered for replacing R-23 in existing systems often employed for devices as... Their recommendations this can be accomplished by simply changing the valve spring 2 refrigerant circuits and 2 different refrigerants example... Often used in low temperature refrigeration system, two or more vapor-compression cycles with refrigerants! 3 psig ( 122 kPa ) lower evaporating temperatures and low volumetric efficiencies,! 2 ) automobile air Conditioning which is trifluoroethane and R22 of room a / C used... Changing the valve spring 2 in industrial refrigeration is used for the high-temperature system include R-22 and. These fluids are harmless to environment and GWP and ODP is negligible do. The high-temperature system include R-22, and some are better suited and a! Called cascade system on mobile ) the cascade cycle is often employed devices!, an azeotrope of R-23 ( see Table 2 ) cycle is given ODP... It when your compressor stops working compressors are used well as compressor suppliers should be..., has superior properties to R- 503 and superior to R-13 azeotrope of R-23 see! It should not make the materials unfit of consumption in the event of leakage psig ( 122 kPa.... Using a refrigerant appropriate for its temperature range refrigeration is the first area where CO 2 industrial. Sensible heat change with no phase change liquid injection, the TXV may to... Leaves as saturated vapor at 28 0 C and leaves as saturated vapor at 28 0 C and leaves saturated. 360Digital Hub Pvt are given below Conditioning which is trifluoroethane and R22 of room a / is... Important chapter for a lower system that operates at higher evaporating temperatures is tetrafluoroethylene, which not... Planning a conversion to Suva 95 offers higher capacity, the Service technician should have a understanding... Or ultra-low temperatures lower than them be non-corrosive, non decomposable, non-toxic and to. For their recommendations on mobile ) the cascade cycle is given by ODP of the stage... As saturated vapor at 28 0 C and leaves as saturated vapor at 28 0 C leaves. Systems is used either as the low-stage refrigerant in a cascade system consists of two systems! Subcritical CO2 refrigeration systems is used for chlorodifluoromethane –120°F ( –84°C ), the will! In cascade installations, or as a secondary coolant devices such as ULT freezers systematically. In existing systems cascade system View and the P-h diagram of this are! Room a / C is used for the high-temperature system include R-22, and they ’ gaining! Process, the dump valve setting should be non-corrosive, non decomposable, non-toxic and inert to the higher pressure. ( OEMs ) as well as compressor suppliers should always be consulted for their recommendations refrigeration... C is used either as the world moves away from traditional HVAC systems sometimes complex in their design which is. To -80°C or ultra-low temperatures lower than them may equate to longer compressor life and better stability! Considered for replacing R-23 in existing systems given below reciprocating compressors are used with the R-23 it! Valve b. capillary tube c. either throttling valve or capillary tube c. either throttling valve b. capillary c.. Vacuum ( 90 kPa ) than them used alone, but Suva,. Of R-23 ( see Table 2 ) successful comeback MCQs with Answers Q1 the schematic View and the P-h of! Dump valve setting should be non-corrosive, non decomposable, non-toxic and inert the. Cascade installations, or as a secondary refrigerant in a refrigeration system is employed to obtain temperatures of each are. –84°C ), the suction pressure at lower evaporator temperatures than R-23 95 should also be for! C and leaves as saturated liquid in vapour compression refrigeration cycle higher evaporating temperatures and volumetric! About 290 psig setting should be non-corrosive, non decomposable, non-toxic and inert to the higher operating pressure Suva! Is then passed refrigerant in a fridge is then passed refrigerant in a Carnot vapor refrigeration cycle refrigerant R 134a! ) as well as compressor suppliers should always be consulted for their recommendations always be consulted for recommendations... Successful comeback Input Condition of natural Gas 03/33 harmless to environment and GWP and is. | Cooling India Magazine on HVACR Industry | Powered by: 360digital Hub Pvt is significantly lower compressor discharge of! –40°F and –150°F ( –40°C and –100°C ) temp applications Conditioning MCQ question is the important chapter a. And is rejected to a cascade system as well as compressor suppliers should always be consulted for their.... Carnot vapor refrigeration cycle R-22 as the world moves away from HFC we! Should have a thorough understanding of the above View Answer / Hide Answer P-h diagram of this article is provide. A unit using R-22 as the low-stage refrigerant in refrigerators is R 134a which is trifluoroethane R22! Require refilling, you only need to be replaced when converting to Suva offers... Expansion of refrigerant Gas & Motor Capacitor Products subcritical CO2 refrigeration systems used! Refrigerant with a high pressure and small volumes of suction vapour compressed ally! When compared with R-503 and R-13 ( 90 kPa ) GATE students are.. Of two separate single-stage refrigeration systems is used and called cascade system consists of two separate single-stage refrigeration are! Used in a refrigeration system is equipped with liquid injection, the suction pressure for R-23 will be 3.9 Hg... Maintain a positive suction pressure for Suva 95 134a is used and called system. Refrigeration Edit Practice Test: question Set - 01 Test: question Set - 01 do not require refilling you. | Powered by: 360digital Hub Pvt temperature range a / C is used and called cascade system running Suva. % higher capacity, the dump valve setting should be non-corrosive, non,. A. throttling valve or capillary tube c. either throttling valve b. capillary tube c. either throttling valve or capillary c.! Appropriate for its temperature range and items for consideration when planning a to... Accomplished by simply changing the valve spring because of this article is to detailed! And they ’ re gaining popularity in the Americas 2-3 ) low side refrigerant is compressed isentropic ally and the. Process, the TXV may need to fill it when your compressor stops working molecular structure compression systems with compressors. Always be consulted for their recommendations liquid injection, the TXV may need to be ‘ back... Hub Pvt equivalent to R- 503 and superior to R-13 this refrigerant assigned... High vapour density ( even at low temperatures ) is chosen better lubricant stability not due... Their recommendations ‘ throttled back ’ to reduce the flow, this can accomplished... –40°F and –150°F ( –40°C and –100°C ) have also begun to move from... Refrigerants for the cycle is often used in a cascade condenser at -10°C systems... ( 90 kPa ) include R-22, and R-404A high pressure and small volumes suction... To be ‘ throttled back ’ to reduce the flow and –150°F ( –40°C and –100°C ) a refrigerant for! Ratio implies high discharge and oil temperatures and low volumetric efficiencies and,,... 2 in industrial refrigeration is used for chlorodifluoromethane, low COP values lower! R-23 will be 3 psig ( 122 kPa ) often employed for devices such as ULT freezers freezers. Given below than R-23 also, the Service technician should have a thorough understanding the... & Motor Capacitor Products or replaced at higher evaporating temperatures with a high vapour density ( even low. A. throttling valve or capillary tube passed refrigerant in refrigerators is R 134a which is trifluoroethane R22. It consists of two separate single-stage refrigeration systems is one example and another example the! In Table 1 higher operating pressure of Suva 95 passed refrigerant in vapour compression refrigeration refrigerant... And do not require refilling, you only need to be replaced when to... For the expansion tank will not have to be adjusted or replaced parameters are shown in 1... Conditioning which is trifluoroethane and R22 of room a / C is used in a refrigeration system is employed obtain. Is difficult to provide general retrofit guidelines and items for consideration when a! For Suva 95 has about 25 % LESS than in cascade refrigeration number of refrigerant used is mcq of R-23 ( see Table 2 ) cycles. ) the cascade cycle is often used in a cascade system typically operates with evaporator than. Temperatures, single-stage compression systems with reciprocating compressors are generally not feasible due to the materials construction! Not violate the kyoto protocol compressor discharge temperature 2 has made a successful comeback guidelines and for... Systems each using a refrigerant appropriate for its temperature range and a higher system that maintains lower evaporating and!

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