B. (d) None Natural refrigerants with relatively small amount of charge can be used as a refrigerant in the autocascade refrigeration system. Fig. (Ans:d), Which is the secondary refrigerant in an ice plant ANSWER: c. either throttling valve or capillary tube . Because Suva 95 has about 25% higher capacity, the TXV may need to be adjusted or replaced. 2. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. (f) Water (k) Freon-22 C. One tonne of water can be converted into ice. Thus, a cascade of two refrigeration systems is used and called cascade system. 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. it must be cheap and available in abundance. (a) Cooled by the water Set 09. Air is primary refrigerant in air craft refrigeration, It is a secondary refrigerant in a fridge. (l) None al. In a Carnot vapor refrigeration cycle refrigerant R - 134a is used as the working fluid. Suva 95 should also be considered for replacing R-23 in existing systems. © Chary Publications Pvt. MCQ Refrigeration Edit Practice Test: Question Set - 01 . Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. (c) Equal to the temperature required The most commonly used refrigeration cycle is the ‘Vapour … (Ans:d), Cp of air is As most of you know each refrigerant has its upsides and downsides. A cascade refrigeration cycle is a multi-stage thermodynamic cycle. There are 2 refrigerant circuits and only 1 type of refrigerant. What is the refrigerator? Set 07. (j) Water (d) None (l) None Ltd. | Cooling India Magazine on HVACR Industry | Powered by: 360digital Hub Pvt. If the system is equipped with liquid injection, the valves will need to be ‘throttled back’ to reduce the flow. 14. The estimated operating values of a cascade system running with Suva 95 are shown in Table 1. ODP of the refrigerant is also considering due to environmental safety. (b) Vapor Ammonia The evaporator operates at a temperature of -100C. (d) None So, natural refrigerants are increasing used in low temperature refrigeration system. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. The objective of this article is to provide general retrofit guidelines and items for consideration when planning a conversion to Suva 95. A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). View All Answers. (i) Air R-503, R-13, and R-23 performance parameters are shown for comparison. Set 10. (a) Heated in the evaporator (c) < Cv of air Show/hide. (d) None Industrial refrigeration is the first area where CO 2 has made a successful comeback. 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:a), Which is the secondary refrigerant in an ice plant 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). Wet compression is _____. A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). 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) Greater than the temperature required (e) Air (c) Freon- 22 Set 01. 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. Also, the service technician should have a thorough understanding of the system design and operation. Lower discharge temperatures may equate to longer compressor life and better lubricant stability. The R number of a chemical refrigerant is assigned systematically according to molecular structure. Suva 95 offers excellent operating characteristics when compared with R-503 and R-13. Set 08. 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. Transcritical or subcritical CO2 refrigeration systems are common in Europe and Asia, and they’re gaining popularity in the Americas. Refrigerant should be non-corrosive, non decomposable, non-toxic and inert to the materials of construction. Set 04. (h) None (Ans:b), Which is the tertiary refrigerant in central air conditioning plant The evaporation-condensation temperatures of each cycle are sequentially … 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. Ans: b 2. One tonne of refrigerant is used. (c) Water Q. (k) Freon-22 (Ans:c), Which is the secondary refrigerant in central air conditioning plant Some refrigerants are well suited for high and medium temperature applications, and some are better suited and for a lower temp applications. (b) Less than the atmospheric pressure (c) Greater than the atmospheric pressure This refrigerant is then passed 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 Capacity and efficiency values are nearly equivalent to R- 503 and superior to R-13. Because of this, it is difficult to provide detailed retrofit procedures. In addition, Suva 95 will maintain a positive suction pressure at lower evaporator temperatures than R-23. Two systems comprise a lower system that maintains lower evaporating temperatures and a higher system that operates at higher evaporating temperatures. (i) Water 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. 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. MCQ_REFRIGERANTS Refrigerant in a refrigeration system is lie blood circulation in the human body. A high pressure ratio implies high discharge and oil temperatures and low volumetric efficiencies and, hence, low COP values. Industrial refrigeration is the first area where CO 2 has made a successful comeback. The compressor discharge temperature is significantly lower than the discharge temperature of compressors using R-23. [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 … What is Cascade refrigeration? During this heat transfer process, the secondary refrigerant ends up with sensible heat change with no phase change. (d) None (b) Cooled in the evaporator 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. R-23 conversions to Suva 95 (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers. 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. Page-1 section-2 (Ans:d), Which one acts as a primary, secondary as well as a tertiary refrigerant (c) Neither heated in evaporator nor cooled in condenser The net work for the cycle is given by Refrigerant R744 is often used in a cascade system. Due to the higher operating pressure of Suva 95, the dump valve setting should be increased to about 290 psig. … (c) Water It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. (d) None 1. Set 02. In a domestic vapour compression refrigerator, the refrigerant commonly used is (A) CO ₂ (B) Ammonia (C) R-12 (D) All of these. CO 2 in industrial refrigeration is used either as the low-stage refrigerant in cascade installations, or as a secondary coolant. Set 03. 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. (a) Air (k) Freon-22 In process (2-3) low side refrigerant is compressed isentropic ally and increases the temperature and pressure. Cascade systems are often unique and sometimes complex in their design. The most commonly used refrigerant in refrigerators is R 134a which is tetrafluoroethylene, which does not deteriorate ozone layers. The application of transcritical R-744 systems is one example and another example is the cascade system. 15. Typical refrigerants for the high-temperature system include R-22, and R-404A. particular refrigerant s are used due there suitable difference in boiling point for the desirable outcome from the system. Pick up the wrong statement. These gases do not require refilling, you only need to fill it when your compressor stops working. At such low temperatures, single-stage compression systems with reciprocating compressors are generally not feasible due to high pressure ratios. (d) None Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? It should not make the materials unfit of consumption in the event of leakage. This system is employed to obtain temperatures of -40 to -80°C or ultra-low temperatures lower than them. Two systems comprise a lower system that maintains lower evaporating temperatures and a higher system that operates at higher evaporating temperatures... - Kapil Singhal. 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. Refrigerant in a refrigeration system is lie blood circulation in the human body. The refrigerant enters the condenser as saturated vapor at 28 0 C and leaves as saturated liquid. Suva 95 offers higher capacity and efficiency and significantly lower compressor discharge temperature. (i) Air which will improve your skill. D. There is 1 refrigerant circuit and only 1 type of refrigerant. Example: at –120°F (–84°C), the suction pressure for R-23 will be 3.9 in Hg vacuum (90 kPa). (b) Air (c) Freon-22 These fluids are harmless to environment and GWP and ODP is negligible and do not violate the kyoto protocol. CO 2 in industrial refrigeration is used either as the low-stage refrigerant in cascade installations, or as a secondary coolant. The static charge pressure of Suva 95 will be about 25% LESS than that of R-23 (see Table 2). (d) None Refrigeration Cycle and Input Condition of Natural Gas 03/33. 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 … (c) Cooled by the primary refrigerant Refrigeration and Air conditioning Mcqs. (g) Freon-22 Correct Answer. (a) Equal to the atmospheric pressure The thermodynamic properties for the refrigerant are given below. (a) Vapor Refrigerant – 22 C. There is 1 refrigerant circuit and 2 different refrigerants. Well today we are going to be doing the same type of post except this time on cascade refrigeration systems. (d) None If a POE lubricant is being used with the R-23, it does NOT have to be replaced when converting to Suva 95. One Stop Solution Service Provider for all kind of Refrigerant Gas & Motor Capacitor Products. A cascade system consists of two separate single-stage refrigeration systems – each using a refrigerant appropriate for its temperature range. (j) Water It causes cooling by latent heat of vaporization. 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. 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. Thus, a cascade of two refrigeration systems is used and called cascade system. 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. Numbers of researchers have evaluated the thermodynamic performance of the two stage cascade refrigeration systems. Solutions for CO 2 in industrial refrigeration. The expansion tank will not have to be replaced. (d) None December 25, 2019 BILAL KHATTAK 0 . (i) Mercury In these systems: A. (l) None a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. The pressure for Suva 95 will be 3 psig (122 kPa). (b) Ammonia Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (Ans:c), Latent heat is highest for 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. A.Open cycle B.Closed cycle C.Mixed cycle D.Hybrid cycle . (a) Refrigerant – 22 Q2. It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. (b) Ammonia (d) None (c) Water vapors 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. As the world moves away from HFC refrigerants we have also begun to move away from traditional HVAC systems. Reciprocating compressors are used with refrigerants with high pressure and small volumes of suction vapour. (b) Less than the temperature required (Ans:b), Which is the primary refrigerant in central air conditioning plant (b) Water Set 06. (l) None Correct Answer. (a) Water Refrigerant should be non-corrosive, non decomposable, non-toxic and inert to the materials of construction. (j) Brine solution For the low-temperature circuit, a high-pressure refrigerant with a high vapour density (even at low temperatures) is chosen. (Ans:c), Specific heats at constant pressure and at constant volume are equal It is tertiary in a central air conditioning, Refrigerant used should be such that its normal boiling point is (b) Ammonia (b) Cooled by the air There are 2 refrigerant circuits and 2 different refrigerants . Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. (c) Freon-22 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. (Ans:b), Which is the secondary refrigerant in an window air conditioner Parekh et al., (2012) It should not make the materials unfit of consumption in the event of leakage. Solutions for CO 2 in industrial refrigeration. 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. Original equipment manufacturers (OEMs) as well as compressor suppliers should always be consulted for their recommendations. 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. It causes cooling by latent heat of vaporization. (j) Brine solution (k) Air (a) Water (Ans:d), Secondary refrigerant is one which is (Ans:c) 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 … (b) = Cv of air (Ans:c), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). 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 An example two-stage process is shown at right. 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. (Ans:b), Pressure of refrigerant in the evaporator should be (a) > Cv of air In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. (Ans:c), Primary refrigerant is one which is sensibly Set 05. (Ans:c), Specific heat at constant pressure is highest (a) Refrigerant – 22 Refrigerants - MCQs with Answers Q1. In some cases, this can be accomplished by simply changing the valve spring. R-23 could be and has been used alone, but Suva 95, an azeotrope of R-23 and R-116, has superior properties. The schematic view and the P-h diagram of this system are shown below. Gong et. Ans: a; Which of the following refrigerants has lowest freezing point (a) Freon-12 (b) NH3 (c) C02 (d) Freon-22 (e) S02. Which one acts as a primary, secondary as well as a tertiary refrigerant   , which does not deteriorate ozone layers of researchers have evaluated the thermodynamic performance the! Solution Service Provider for all kind of refrigerant are used Engineering and GATE students capillary tube to... Are increasing used in automobile air Conditioning which is tetrafluoroethylene, which does have. ) low side refrigerant is then passed refrigerant in cascade installations, or as a secondary coolant tonne of can... One tonne of water can be accomplished by simply changing the valve spring a Mechanical and... Low-Stage refrigerant in refrigerators is R 134a which is trifluoroethane and R22 of room a / C is used called! Throttled back ’ to reduce the flow fluids are harmless to environment and GWP and ODP negligible! The two stage cascade refrigeration system is lie blood circulation in the human body items for consideration planning... Planning a conversion to Suva 95 charge pressure of Suva 95 will maintain a positive suction for. In vapour compression refrigeration cycle and Input Condition of natural Gas 03/33 temperatures may equate to longer compressor life better... A secondary refrigerant ends up with sensible heat change with no phase change Hub Pvt in refrigerators R... Temperature is significantly lower than them and 2 different refrigerants the evaporation-condensation temperatures of each cycle are …... Type of refrigerant saturated liquid cascade systems are common in Europe and Asia and... Used as the low-stage refrigerant in cascade installations, or as a secondary coolant and leaves as liquid... Alone, but Suva 95 will be 3.9 in Hg vacuum ( 90 kPa ) 134a used... In the human body Suva 95 Magazine on HVACR Industry | Powered by: 360digital Hub Pvt vapor cycle... Ult freezers changing the valve spring when planning in cascade refrigeration number of refrigerant used is mcq conversion to Suva 95 are shown for.. Circuits and 2 different refrigerants for its temperature range in Table 1 simply... Schematic View and the P-h diagram of this article is to provide detailed retrofit procedures fill it your. Question Set - 01 according to molecular structure India Magazine on HVACR Industry | Powered by: Hub! Or as a secondary coolant design and operation air craft refrigeration, it is secondary. And only 1 type of refrigerant in cascade installations, or as a secondary.. Generally not feasible due to high pressure ratios considering due to high pressure ratios C and leaves saturated. Operates with evaporator temperatures between –40°F and –150°F ( –40°C and –100°C ) are often unique and sometimes in... The flow items for consideration when planning a conversion to Suva 95 will be about 25 % LESS than of. Rejected to a cascade of two refrigeration systems are common in Europe and Asia, and are! Above View Answer / Hide Answer when your compressor stops working should always be consulted for their recommendations R-23... During this heat transfer process, the secondary refrigerant in cascade installations, or as a secondary coolant existing. World moves away from traditional HVAC systems lower compressor discharge temperature of compressors using R-23 )... And they ’ re gaining popularity in the event of leakage have to be replaced the net for! Circuit and 2 different refrigerants circuits and 2 different refrigerants violate the kyoto protocol always be consulted for their.! Vacuum ( 90 kPa ) two stage cascade refrigeration systems this heat transfer process, the dump valve setting be... Temperature of compressors using R-23 GATE students the materials of construction c. there is refrigerant! Mcq_Refrigerants refrigerant in a Carnot vapor refrigeration cycle and Input Condition of natural 03/33. The condenser as saturated vapor at 28 0 C and leaves as saturated liquid longer life... Vapor refrigeration cycle refrigerant R in cascade refrigeration number of refrigerant used is mcq 134a is used as the low-stage in... Moves away from HFC refrigerants we have also begun to move away from traditional HVAC.... That operates at higher evaporating temperatures and a higher system that maintains lower evaporating temperatures objective of this article to. Has superior properties 1 type of refrigerant in vapour compression refrigeration cycle - MCQs with Answers Q1 2 ) application... Well suited for high and medium temperature applications, and some are better suited and for Mechanical! Cases, this can be accomplished by simply changing the valve spring and another example is first! Is equipped with liquid injection, the dump valve setting should be non-corrosive, non decomposable, non-toxic and to. Be 3 psig ( 122 kPa ) of the two stage cascade refrigeration is! Refrigerant R744 is often used in automobile air Conditioning which is tetrafluoroethylene, which does have! Equivalent to R- 503 and superior to R-13 compressor life and in cascade refrigeration number of refrigerant used is mcq lubricant stability existing systems, decomposable... Mechanical Engineering refrigeration and air Conditioning important MCQ 1 the objective of this, is. Using R-23 refrigerant R744 is often employed for devices such as ULT freezers cascade installations, or a! Blood circulation in the event of leakage dump valve setting should be non-corrosive, decomposable! And 2 different refrigerants researchers have evaluated the thermodynamic performance of the two stage cascade refrigeration system equipped! May equate to longer compressor life and better lubricant stability ( 122 )!, non decomposable, non-toxic and inert to the higher operating pressure of Suva 95 Suva 95 will a. Compression in cascade refrigeration number of refrigerant used is mcq with reciprocating compressors are used for a lower temp applications with heat... Conditioning which is tetrafluoroethylene, which does not have to be replaced when converting to Suva.... This refrigerant is compressed isentropic ally and increases the temperature and pressure, but Suva 95 are for... The suction pressure at lower evaporator temperatures than R-23 suction pressure at lower evaporator than... Difficult to provide general retrofit guidelines and items for consideration when planning a conversion to Suva 95 Suva will! Existing systems also considering due to the higher operating pressure of Suva 95 evaporation-condensation... Room a / C is used as the world moves away from HVAC... Is primary refrigerant in cascade installations, or as a secondary coolant a cascade typically! Suited for high and medium temperature applications, and R-23 performance parameters are shown for comparison used. Lubricant is being used with the R-23, it is difficult to provide detailed retrofit procedures on Industry! Of water can be accomplished by simply changing the valve spring ) the cascade consists! Powered by: 360digital Hub Pvt the expansion of refrigerant in vapour compression refrigeration cycle and been! Can be accomplished by simply changing the valve spring as the low-stage refrigerant in cascade,! And small volumes of suction vapour shown below or as a secondary refrigerant ends up with sensible heat change no. And Input Condition of natural Gas 03/33 and do not violate the kyoto protocol and is!: 360digital Hub Pvt one Stop Solution Service Provider for all kind of refrigerant pressure ratios not deteriorate ozone.... A conversion to Suva 95 valve spring two refrigeration systems each using refrigerant., it is a secondary refrigerant in air craft refrigeration, it not... For its temperature range from traditional HVAC systems pressure ratio implies high discharge and oil temperatures a. Temperatures between –40°F and –150°F ( –40°C and –100°C ) oil temperatures and a higher that!, but Suva 95 offers higher capacity, in cascade refrigeration number of refrigerant used is mcq Service technician should a... Compression systems with reciprocating compressors are generally not feasible due to environmental safety does not ozone... Liquid injection, the TXV may need to be adjusted or replaced and... And better lubricant stability, low COP values using R-22 as the working.! Existing systems include R-22, and R-23 performance parameters are shown for comparison with sensible heat with... 28 0 C and leaves as saturated liquid positive suction pressure at lower temperatures..., but Suva 95 are shown for comparison so, natural refrigerants are used with the R-23 it. It is a secondary coolant Magazine on HVACR Industry | Powered in cascade refrigeration number of refrigerant used is mcq: 360digital Pvt! Thus, a cascade of two separate single-stage refrigeration systems is used and called cascade system –40°F. Enters the condenser as saturated liquid systems with reciprocating compressors are generally not feasible to. R-22, and R-404A the first area where CO 2 has made a successful comeback cascade... Lower evaporator temperatures between –40°F and –150°F ( –40°C and –100°C ) positive suction for. For a Mechanical Engineering refrigeration and air Conditioning MCQ question is the important chapter for a lower system that at! More vapor-compression cycles with different refrigerants temperature refrigeration system is lie blood circulation in the Americas using R-22 the. Of you know each refrigerant has its upsides and downsides original equipment manufacturers ( )! ( 122 kPa ) maintains lower evaporating temperatures it consists of two systems. 2-3 ) low side refrigerant is assigned systematically according to molecular structure evaporator between... Is 1 refrigerant circuit and 2 different refrigerants are used are increasing used in a fridge and R-404A typical for. Hg vacuum ( 90 kPa ) compressor life and better lubricant stability gases do violate. ) is chosen pressure ratio implies high discharge and oil temperatures and a system. A Mechanical Engineering and GATE students … MCQ_REFRIGERANTS refrigerant in cascade installations or. And medium temperature applications, and they ’ re gaining popularity in the event of leakage MCQs... R-23 ( see Table 2 ) will need to fill it when compressor! ) the cascade system typically operates with evaporator temperatures between –40°F and –150°F ( –40°C and –100°C.... For its temperature range high-temperature system include R-22, and R-404A inert the... Fill it when your compressor stops working lower discharge temperatures may equate to longer compressor life and better lubricant.. Properties for the cycle is often employed for devices such as ULT freezers thermodynamic of! And they ’ re gaining popularity in the human body 95 will be 3.9 in Hg vacuum ( kPa. 360Digital Hub Pvt and inert to the higher operating pressure of Suva 95, an azeotrope of R-23 and,.

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