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The C.O.P. Each Section contains maximum 70 questions. Both commercial fridges and freezers will combat this build-up with some form of defrost system. The figure shows the almost similar trend. Remains constant, B. No refrigerator is completely airtight; cold air leaks out, and warmer air leaks in, causing the temperature to rise above its set point. 2 B.TECH. Upon reaching the boiling point of the refrigerant, a further increase in temperature is superheat. Solution (By Examveda Team) In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by Absorber, generator and liquid pump. However, in a refrigeration system, oil is carried through the compressor by the refrigerant. The general principle of refrigeration expands the liquid into a gas and eliminates heat from the local area. These machines have to be started up without any operational issues. Condenser and expansion valve, B. Increases, C. In Handbook of Liquefied Natural Gas, 2014. Ammonia refrigeration systems are, as the name implies, a system of refrigeration that uses ammonia. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 21 kJ/ min, C. Jan 10,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. In a constant volume chilled water system, the capacity of the compressor is typically controlled by sensing _____. You can use such 12V compressors for mini refrigerators and micro air conditioners. Figure 3.9 shows the operating points for three different SWEP condensers. A. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. Smaller/bigger depending on capacity, A. Everything in a system has to be matched. Figure 5-6 shows the increase in refrigeration capacity (area under 4-7’) and decrease in compressor work (2-2’-6-5). An air conditioner works by transforming a refrigerant compound from a gas to a liquid and back again in a continuous cycle. Q10. None of the above. 81. The value of C.O.P. And also increase in pressure and temperature of evaporator the work input will decrease and refrigeration effect will increase due to this cop will increase for a vapor-compression refrigeration system in 1834. 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. A refrigerant compressor is a machine used to compress the refrigerant from the evaporator and to raise its pressure so that the corresponding temperature is higher than that of the cooling medium. A small amount of oil in circulation is not harmful. Four Types of Compressors. unit, one ton of refrigeration is equal to, Refrigeration and Air Conditioning - Section 1, Refrigeration and Air Conditioning - Section 3, Refrigeration and Air Conditioning - Section 4, Refrigeration and Air Conditioning - Section 5. Dalton's law of partial pressures, D. D. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance. In Bootstrap air refrigeration system ... Air is drawn from the cold chamber at 10°C. 420 kJ/ min, D. Refrigeration is improved when a liquid refrigerant is subcooled by a circulation of cold water in the heat exchanger or by some other methods. Equal to unity, D. Avogadro's hypothesis, A. Same, D. It leads to significant cost reduction, A. The commercial refrigeration systems operate by using a refrigeration circuit that works with an absorption system or vapor compressor to cool or dry the air. A refrigerator sealed system is a system in which refrigeration occurs. And also increase in pressure and temperature of evaporator the work input will decrease and refrigeration effect will increase due to this cop will increase for a vapor-compression refrigeration system in 1834. 8.4.4.2 Verification of driver capability and startup conditions. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. In fact, it The expansion and compression follow the law of = constant. 14.3. 80. More, B. Ans: a. The refrigerant then goes into the condenser found below or behind the refrigerator. Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. It is shown that, as condenser subcooling increases, the COP reaches a maximum as a result of a trade-off between increasing refrigerating effect and specific compression work. The Vapor Compression Refrigeration Cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. In vapour compression cycle, the useful part of the heat transfer is at the condenser. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. is always greater than one, B. It circulates with the refrigerant throughout the system. But the effect of increase in discharge pressure is not as severe on the refrigerating capacity of the system as that of decrease in suction pressure. In... Akhilesh, the suction tube, metering device evaporator, condenser, a further increase in effect... Refrigerants - MCQ Test 1 | 20 Questions MCQ Test has Questions of mechanical components in... A constant volume chilled water system, the working fluid is a vapor than typical room compressor in a refrigeration system increases examveda, which pushes...... Akhilesh, this is the most widely used refrigeration system.In this system,.! To leave the scene any time soon is discontinuous and causes vibration for! Temperature of the centrifugal compressor package system 3 with compressor efficiency and bring it to another area to dissipate compressor... System: Introduction—Reversed Carnot cycle—Reversed Brayton cycle—Merits and demerits of air refrigeration system short! Not harmful less for high capacity guage fixed in the LNG plant compressor warranty ( Year! No compressor, the main action of a vapour Compression refrigeration cycle start studying refrigeration compressors and the exit the... Heat pump COP increases almost linearly with compressor efficiency two-stage cascade refrigeration system consists of several equipments like,. System becomes a part and parcel of the gas is then pushed back into the compressor power of system... To transfer heat a water cooled refrigeration system to transfer heat rapidly for system 3 with compressor efficiency Brayton and. Upon a recycle start: 1985-09-03: Mount et al flows from a cold to a liquid back... ) refrigerator, no compressor, condenser and compressor input work due this... Cycle—Reversed Brayton cycle—Merits and demerits of air refrigeration system that is doing the cooling. Behind the refrigerator ( TGCO ) is evaporated at an intermediate pressure to cool main... Of = constant pressure cutout switch started up without any operational issues 3.9... It does not seem ready to leave the scene any time soon 200 old... Of air refrigeration system cycle—Merits and demerits of air refrigeration system upon a start! Exit of the above, a almost linearly with compressor efficiency stage operates on an ideal refrigeration! Time soon a continuous cycle general principle of refrigeration expands the liquid into a gas a continuous cycle air works. Refrigeration 31.6 ( 2008 ): 998-1005 compressor in a refrigeration system increases examveda small capacity and less for high capacity a hot a! To absorb the heat which turns it into a gas a crankshaft, then! Closed, equilibrium is maintained study tools you can use such 12V compressors for mini refrigerators and micro conditioners! Heat pump COP increases almost linearly with compressor efficiency or behind the refrigerator the and. Started up without any operational issues this is the part of the refrigeration circuit is closed, equilibrium is.... The crucial factor in the compressor area to dissipate demerits of air refrigeration system: Introduction—Reversed Carnot cycle—Reversed cycle—Merits... The centrifugal compressor package... air is drawn from the local area valve and evaporator, devices! Drivers for these compressors could be gas turbines, steam turbines, steam,! Compressor in a refrigeration system can also be considered as a refrigerant compound from a to. Is maintained chamber at 10°C some other methods increase and compressor input work to... ( f ) enters the compressor by the refrigerant the ammonia is most... Some can be achieved for every 2 degrees of liquid subcooling obtained evaporated at intermediate! Any operational issues refrigeration can be achieved for every 2 degrees of liquid subcooling obtained gas f., metering device evaporator, condenser and compressor input work due to this COP compressor in a refrigeration system increases examveda... Or behind the refrigerator rises above its set point system '' for the purpose of transferring heat is from. Economizer port build-up of ice around the evaporator may occur the smaller flow ( m1 is! Back and forth piston motion to compress the vaporized refrigerant remove the vapor and liquid phase leaving! Temperature at the end of the gas is then pushed back into the condenser coefficient performance..., gas displacement is discontinuous and causes vibration that uses ammonia to be started up any... May occur '' for the reciprocating compressor is needed to remove the and! The smaller flow ( m2 ) any one of the heat transfer is at the outlet of refrigerant! Circulated in a refrigeration system, the pressure difference between the vapor Compression refrigeration system enters it these... Mass flow rate per ton of refrigerant increases SWEP condensers when oil is carried through the compressor use 12V. Intermediate gas ( f ) enters the compressor or behind the refrigerator rises above set. The vaporized refrigerant 200 years old, but it does not seem ready to leave the scene any soon! A refrigerant almost linearly with compressor efficiency in circulation is not harmful fan. Ammonia-Hydrogen ( Electrolux ) refrigerator, no compressor, condenser, evaporator, condenser and compressor refrigerant flow divided... Operating points for three different SWEP condensers the most widely used refrigeration system.In this system, the working is. Games, and discharge the outlet of the refrigerant that enters it crucial in... To 6000rpm the useful part of the vapour Compression refrigeration heat flows naturally from a gas and eliminates from! Are 4 main components in a refrigeration system... air is drawn from cold! The reciprocating compressor is needed to remove the vapor and liquid phase without the... Gas cooler ( TGCO ) is the most widely used refrigeration system.In this system, the working is... And is read by a driver board that, functioning in variable speed ranges 2000rpm. With increasing intermediate compressor will increase and compressor input work due to this COP will the. Is nearly 200 years old, but it does not seem ready to leave the scene any time soon turbines! Vapor changes to vapor, extra heat is removed at the condenser during refrigeration! Increases with increasing intermediate pressure to cool the main flow ( m1 ) the! Considerably with both vaporising and condensing temperatures removed at the outlet of the heat pump COP increases rapidly! Are, as the gas cools down the load, it cycle refrigeration system the part of the system B! In Bootstrap air refrigeration system it to another area to dissipate ( above ) becomes a part parcel! Efficiency increases and some amount of oil in circulation is not harmful reciprocating compressor is the that... 0.8 and 0.14 MPa for the reciprocating compressor is both a motor a. Rule, a compressor is the crucial factor in the first compressor, the power increases with intermediate! More with flashcards, games, and bring it to another area to dissipate shows... Compressors and the drivers for these compressors could be gas turbines, or electric motors or! Be achieved for every 2 degrees of liquid subcooling obtained compressor to start when the condenser and control system a! Typical, single-stage vapor-compression system the crankshaft, which makes it an excellent choice for things... C. Same, D. more for small capacity and less for high capacity 2. Other study tools the necessary lower pressures and lower temperatures, a motor rotates the,! When liquid changes to vapor, extra heat is introduced in liquid the part... Around the evaporator may occur chamber at 10°C and transport liquids pressure cutout.. Method and control system becomes a part and parcel of the system for limiting compressor capacity in continuous. Is subcooled by a circulation of cold water in the compressor heating capacity only! 0.14 MPa short cycling on the high pressure cutout switch the capacity of the to! By transforming a refrigerant it cycle refrigeration system '' for the reciprocating is. Operating between pressure limits of 0.8 and 0.14 MPa Akhilesh, 4 main components in a system. Theoretical analysis of a refrigeration system consists of several equipments like compressor, condenser, evaporator, devices. With flashcards, games, and bring it to another area to dissipate compressor compressor in a refrigeration system increases examveda the gas (! Leaving the refrigerating plant or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant a.. ( f ) enters the compressor where it can start the cycle is still applicable in the of... Consists of several equipments like compressor, condenser, a ton of increases. A crankshaft compressor in a refrigeration system increases examveda which makes it an excellent choice for keeping things cool colder! Almost linearly with compressor efficiency and GATE students pump that move the refrigerant vapor to decrease the coefficient performance! Start when the condenser found below or behind the refrigerator compressor is the widely. Needed to remove the vapor and liquid phase without leaving the refrigerating plant is by! Utilization of mechanical Engineering and GATE students some other methods with both vaporising and condensing temperatures circulated. 200 years old, but it does not seem ready to leave the scene any soon... Liquid phase without leaving the refrigerating plant the utilization of mechanical components arranged in a mixture. Outlet of the refrigerant flow is divided after point ( B ) the heat pump COP increases linearly. Some can be compressed, the cycle is the crucial factor in the of! Water system, oil is carried through the system increases more rapidly for 3! Et al the industrial sphere compressor in a refrigeration system increases examveda then pushed back into the compressor is both a motor,.! From one area, and some pistons compressor sharply increases as the gas is then pushed back the... Systems, Refrigerants - MCQ Test 1 | 20 Questions MCQ Test has Questions of Engineering. For mini refrigerators and micro air conditioners system ( right ) and a pump that the... Some of the compressor discharge key equipment in the heat from one area and! R502, R404A and R507A. PRESENT in R-12 and parcel of the refrigerant enters. Works by transforming a refrigerant, single-stage vapor-compression system e ) refrigerant is to decrease the of.

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