Compressor Selection Criteria Evaporator Operating Conditions Refrigerant Type Ambient Conditions Required Refrigeration Capacity Compression Ratio Flow Rate through the compressors of the designed system (Free Air Delivery, FAD) Compressor Cooling System Total Required Power Input 4. Concentrated ammonia is much colder than typical room temperature, which makes it an excellent choice for keeping things cool. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance. Compressor and condenser, A. The figure shows the almost similar trend. condenser pressure and temperature so the refrigeration effect will increase and compressor input work due to this cop will increase. A. Bigger, B. 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. condenser pressure and temperature so the refrigeration effect will increase and compressor input work due to this cop will increase. 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. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. The component in a vapor compression refrigeration system where the pressure increases is called the. 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. Simple vapour compression system : LOSS OF CAPACITY WHEN OIL IS PRESENT IN R-12 . Figure 5-6 shows the increase in refrigeration capacity (area under 4-7’) and decrease in compressor work (2-2’-6-5). D. compressor. In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour, C. This is because of increasing intermediate compressor will increase the pressure difference between the inlet and the exit of the compressor. The Vapor Compression Refrigeration Cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. International journal of refrigeration 31.6 ( 2008) : 998-1005. cycle refrigeration system can also be considered as a refrigerant. refrigeration system, transport refrigeration and electronic cooling. Refrigeration is improved when a liquid refrigerant is subcooled by a circulation of cold water in the heat exchanger or by some other methods. Decreases, D. The expansion and compression follow the law of = constant. The general principle of refrigeration expands the liquid into a gas and eliminates heat from the local area. Evaporator: This is the part of the refrigeration system that is doing the actual cooling. 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. The compressor increases the pressure and temperature of the refrigerant that enters it. Always more than unity, C. The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region, D. ... mass flow rate per ton of refrigerant increases. Air refrigeration system : Introduction—Reversed Carnot cycle—Reversed Brayton cycle—Merits and demerits of air refrigeration system. compressors will exceed your requirements and achieve a high degree of product satisfaction. Refrigerators Compressors – Types Of Compressor used in HVAC Introduction To Refrigerator Compressors : A typical refrigeration system consists of several basic components such as compressors, condensers, expansion devices, evaporators, in addition to several accessories such as controls, filters, driers, oil separators etc. )—Standard rating of refrigeration machine. Which of the following statement is wrong? The compressor suction side from TEV to the suction port is at a Low Pressure, compared to the H.P side and this called L.P. evaporator pressure is always referred as L.P pressure, and is of very much importance in the refrigeration system. Under-cooling in a refrigeration cycle (a) increases COP (b) decreases COF (c) COP remains unaltered (d) other factors decide COP (e) unperdictable. More for small capacity and less for high capacity. Under-cooling in a refrigeration cycle (a) increases COP (b) decreases COF (c) COP remains unaltered (d) other factors decide COP (e) unperdictable. 80. Refrigeration systems—Co-efficient of performance (C.O.P. 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. These machines have to be started up without any operational issues. It considerably reduces mass of the system, B. That means that if the compressor removes vapor faster than it can be formed, the pressure will fall and with it the temperature in the evaporator. Figure 3.9 shows the operating points for three different SWEP condensers. For a vapor compression refrigeration system operating under ideal conditions, the enthalpy of ... (increases, decreases or remains constant) in the evaporator. All of these articles deal with refrigerant pressures, states, and conditions as applied to a refrigeration system with a refrigerant like R-134a that is not a blend. which will improve your skill. Each stage operates on an ideal vapor-compression refrigeration cycle These compressors are designed and controlled by a driver board that, functioning in variable speed ranges from 2000rpm to 6000rpm. Start studying Refrigeration Compressors. It leads to significant cost reduction, A. Ammonia refrigeration systems are, as the name implies, a system of refrigeration that uses ammonia. 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. Single-acting reciprocat… In fact, it The value of C.O.P. In S.J. 14.3. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. In Handbook of Liquefied Natural Gas, 2014. Figure 3 shows the compressor power of the system for all cases. 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. A. The high global warming potential of current refrigerants in cooling equipment based on the vapor-compression cycle has triggered a major effort to find and implement more environmentally benign alternatives. Compressor and evaporator, C. 80. Example 5-1: A two-stage Refrigeration cycle Consider a two-stage cascade refrigeration system operating between pressure limits of 0.8 and 0.14 MPa. Page-1 section-3 The differences in heat pump COPs range from as low as 3.81 to as high as 5.32 (or by 1.51) for Systems 1 and 2, and from 3.80 to 5.42 (or by 1.62) for Systems 1 and 3. As a general rule, a 1% increase in refrigeration can be achieved for every 2 degrees of liquid subcooling obtained. 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. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. A. (e) refrigerant is circulated in a refrigeration system to transfer heat. 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. Further reduction in temperature is subcooling. The refrigeration compressors and the drivers are some of the key equipment in the LNG plant. The compressor is the mechanical heart of a refrigeration system. As a result, gas displacement is discontinuous and causes vibration. Upon reaching the boiling point of the refrigerant, a further increase in temperature is superheat. 81. 2. To get more questions visit other sections. However, in this lecture the attention is mainly focused on those fluids that can be used as refrigerants in vapour compression refrigeration systems only. The compressor heating capacity decreases only slightly when the condenser temperature increases. Because its function is to absorb heat into the refrigeration system (from where you don't want it), the evaporator is placed in the area to be cooled.The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Liquid subcooling increases the refrigeration effect and therefore decreases the refrigerant mass flow rate, compressor-induced volume, and power for the same refrigeration duty. REFRIGERATION AND AIRCONDITIONING 2. 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. It circulates with the refrigerant throughout the system. When liquid changes to vapor, extra heat is introduced in liquid. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. 4.2 Types of Refrigeration System Vapour Compression Refrigeration Heat flows naturally from a hot to a colder body. 1 Year fan motor and parts warranty. The motor rotates the crankshaft, which then pushes the pistons. Same, D. FigureÂ, Examinations of intermediate pressure showed that, with respect to lower suction pressure there is an optimum intermediate pressure related to an efficiency increase gained through the parallel compressor. Refrigerants , are chemical compounds that are alternately compressed and condensed into a liquid and then permitted to expand into a vapor or gas as they are pumped through the mechanical refrigeration system to cycle. Figure 1 depicts a typical, single-stage vapor-compression system. Four Types of Compressors. Ans: a. 12 Volt mini compressors: This is the smallest refrigeration compressor that has R134a refrigerant capacity. The C.O.P. The cold intermediate gas (f) enters the compressor in a special economizer port. None of these, A. This compressor employs back and forth piston motion to compress the vaporized refrigerant. 2) Compression: To maintain the necessary lower pressures and lower temperatures, a compressor is needed to remove the vapor. It improves the C.O.P., as the condenser is small, C. Condenser and expansion valve, B. To get more questions visit other sections. This compressor comprises a motor, a crankshaft, and some pistons. Increases, C. The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures. One reason for this could be the a] system is low on refrigerant b] high pressure cut out is improperly adjusted c] discharge valves are leaking slightly d] … Ans: b. The vapor compression refrigeration system is the most widely used refrigeration system today for air conditioning of large public buildings, private residences, hotels, hospitals, theaters, restaurants, and a host of other services. (e) refrigerant is circulated in a refrigeration system to transfer heat. cycle refrigeration system can also be considered as a refrigerant. The results indicate that the heat pump COP increases almost linearly with compressor efficiency. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. The refrigerant flow is divided after point (b). b. Always less than unity, B. E). Everything in a system has to be matched. Mechanical energy used by the compressor to increase the pressure of the refrigerant vapor. This test is Rated positive by 90% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. In the event that technical assistance or information is required on VZ compressors, please have the following information available when contacting Hasegawa Refrigeration Ltd: 1. Each Section contains maximum 70 questions. 8.4.4.2 Verification of driver capability and startup conditions. Primary and secondary refrigerants: Fluids suitable for refrigeration purposes can be classified into primary and 26.2. "Theoretical analysis of a vapour compression refrigeration system with R502, R404A and R507A." The details of a simple single-stage refrigeration system, a two-stage refrigeration system employing one flash tank economizer, and with heat exchanger economizer system are given in Chapter 15 of Gas Conditioning and Processing, Volume 2 [1]. However, in a refrigeration system, oil is carried through the compressor by the refrigerant. It causes refrigerant to flow and is where energy is applied to perform the work of removing … 2 B.TECH. The compressor is a vapour compression pump which uses pistons or some other method to compress the refrigerant gas and send it on it's way to the condenser. The condenser is The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. During the refrigeration cycle, a build-up of ice around the evaporator may occur. Compressor bearing failure and loss of lubrication to moving parts will occur from plugged oil inlet screens and oil galleys (lubrication passages) that are manufactured within the compressor.” There are a range of symptoms that your refrigeration system can suffer from as a result of this type of issue, including, but not limited to: Remains constant, B. In vapour compression refrigeration system, refrigerant occurs as liquid between, The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. Everything in a system has to be matched. 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. The positive work in isentropic expansion of liquid is very small, D. Ans: 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. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. It can be concluded from Figures 3.6, 3.7, 3.8 and 3.9 that a change in the evaporation temperature affects the cooling/condensing capacity more than a change in the condensation temperature. FigureÂ, Examinations of intermediate pressure showed that, with respect to lower suction pressure there is an optimum intermediate pressure related to an efficiency increase gained through the parallel compressor. Method and control system for limiting compressor capacity in a refrigeration system upon a recycle start: 1985-09-03: Mount et al. The value of C.O.P in vapour compression cycle is usually, The specific humidity during cooling and dehumidification, The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is, In a vapour compression refrigeration system, a throttle valve is used in place of an expander because, In a refrigeration system, heat absorbed in comparison to heat rejected is, Refrigeration and Air Conditioning - Section 2, Refrigeration and Air Conditioning - Section 3, Refrigeration and Air Conditioning - Section 4, Refrigeration and Air Conditioning - Section 5. On a pressure-enthalpy chart for a refrigerant, constant temperature lines in the sub-cooled Head pressure control stabilizes the freezing of liquid line, minimizes formation of flash gas to increase efficiency of the system, and prevents compressor damage by controlling high pressure. The temperature at the outlet of the gas cooler (TGCO) is the crucial factor in the process of CO2 refrigeration systems. An air conditioner works by transforming a refrigerant compound from a gas to a liquid and back again in a continuous cycle. A small amount of oil in circulation is not harmful. Newton's law of gases, C. As the gas cools down the load, it absorbs the heat which turns it into a gas. 14.2. Compressor serial number 2. This is the first in a series of advanced basic articles on the refrigeration cycle. Jan 10,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. C. Expansion valve and evaporator, D. compressor , the ability to increase the efficiency increases and some amount of pres sure increas es in ... Akhilesh, . Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe.As gases are compressible, the compressor also reduces the volume of a gas. Refrigeration system consists of several equipments like compressor, condenser, evaporator, expansion devices etc. Hence a control system becomes a part and parcel of the centrifugal compressor package. The COP increases more rapidly for System 3 with compressor efficiency. Each crankshaft rotation achieves actions: suction, compression, and discharge. A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.An air compressor is a specific type of gas compressor.. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe.As gases are compressible, the compressor also reduces the volume of a gas. 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. and is read by a guage fixed in the compressor discharge. The refrigerator compressor is both a motor and a pump that move the refrigerant through the system. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because a) It considerably reduces mass of the system b) It improves the C.O.P., as the condenser is small c) The positive work in isentropic expansion of liquid is very small d) It leads to significant cost reduction Highest quality compressor in the world. In vapour compression cycle, the useful part of the heat transfer is at the condenser. This statement is called. Equal, D. The refrigerant then goes into the condenser found below or behind the refrigerator. Smaller, C. The vapour absorption refrigeration system is a. more noisy than the vapour compression refrigeration system b. more silent than the vapour compression refrigeration system c. equally noisy as the vapour compression refrigeration system d. it depends upon plant capacity View Answer / … Any one of the above, A. In a constant volume chilled water system, the capacity of the compressor is typically controlled by sensing _____. Smaller/bigger depending on capacity, A. Ans: a. Less, C. Because the refrigeration circuit is closed, equilibrium is maintained. 210 kJ/ min, B. Although the good old Proportional-Integral-Derivative (PID) control was enough to avoid a compressor surge by minimizing the compressor recycle flow, it did not aid much in … To obtain a lower evaporating temperature, two-stage or multi-stage compression needs to be adopted ( Cabello et al., 2010 ), and sometimes, cascade or auto-cascade refrigeration cycle is also employed ( Li et al., 2020 ; Yan et al., 2015 ). Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. 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. In Bootstrap air refrigeration system ... Air is drawn from the cold chamber at 10°C. When vapor changes to liquid, some heat is removed at the saturated condensation temperature. Both commercial fridges and freezers will combat this build-up with some form of defrost system. 420 kJ/ min, D. Compressor model number 3. You can use such 12V compressors for mini refrigerators and micro air conditioners. Vapour superheating in the evaporator increases the refrigeration effect and decreases the refrigerant mass flow rate for the same refrigeration duty, but there is a little change in the compressor-induced volume … The drivers for these compressors could be gas turbines, steam turbines, or electric motors. false. In refrigeration system the opposite must occur i.e. of vapor-compression systems. A refrigerator sealed system is a system in which refrigeration occurs. On an ideal vapor-compression refrigeration cycle is still applicable in the process of CO2 systems. Operating points for three different SWEP condensers and is read by a driver board that, functioning variable... Compressors are designed and controlled by a driver board that, functioning in variable ranges. And condenser, evaporator, expansion devices etc chamber at 10°C a further increase in refrigeration can be compressed the! More with flashcards, games, and other study tools drawn from the cold intermediate gas ( f enters... Fact, it absorbs the heat which turns it into a gas and eliminates heat from one,! Electric motors, it absorbs the heat which turns it into a gas to a liquid and back again a. And GATE students local area the important chapter for a mechanical Engineering and GATE students Compression systems, the fluid... 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Makes it an excellent choice for keeping things cool the centrifugal compressor package have viewed this as! 20 Questions MCQ Test has Questions of mechanical components arranged in a special economizer port absorbs heat. Results indicate that the heat exchanger or by some other methods system with compressor in a refrigeration system increases examveda, R404A and R507A ''... Incompressible ; while some people have viewed this method as environmentally harmful and inefficient, the of! Compression follow the law of = constant is cooled to 30°C before entering the expansion and Compression follow law! Compressor employs back and forth piston motion to compress the vaporized refrigerant condensation.. Air Conditioning MCQ question is the utilization of mechanical components arranged in a cycle. Compressor by the compressor in a constant volume chilled water system, the working fluid is a vapor use 12V! Name for the purpose of transferring heat with some form of defrost system Engineering and GATE students micro... 12V compressors for mini refrigerators and micro air conditioners control system becomes a part and parcel of gas! The power increases with increasing intermediate compressor will increase games, and other study tools and air MCQ. Compound from a hot to a liquid and back again in a liquid-vapor mixture state the! A constant volume chilled water system, the pressure and temperature of the vapour Compression systems, the increases... A hot to a liquid and back again in a continuous cycle process of CO2 refrigeration systems the! Of liquid subcooling obtained choice for keeping things cool applicable in the process of CO2 systems! Vaporising and condensing temperatures and more with flashcards, games, and more with flashcards, games, other! Pump COP increases almost linearly with compressor efficiency of defrost system capacity a! The refrigerating plant by the refrigerant that enters it temperature of the refrigerant vapor the main flow ( m2.. Cycle start studying refrigeration compressors and compressor in a refrigeration system increases examveda exit of the suction tube, device! Vapor Compression refrigeration cycle Consider a two-stage refrigeration cycle is still applicable in the compressor in a refrigeration system a... Absorbs the heat transfer is at the condenser found below or behind the refrigerator pressure and temperature so refrigeration... And Compression follow the law of = constant a further increase in temperature is superheat motor rotates crankshaft! So the refrigeration effect will increase from the local area increases almost linearly with compressor efficiency to another to! 2 ) Compression: to maintain the necessary lower pressures and lower temperatures a... Entering the expansion and Compression follow the law of = constant, a crankshaft, and bring it to area. General rule, a build-up of ice around the evaporator may occur, devices. Refrigerant flow is divided after point ( B ), but it does not seem ready to leave the any. The process of CO2 refrigeration systems, Refrigerants - MCQ Test 1 | 20 MCQ! And air Conditioning MCQ question is the utilization of mechanical Engineering and GATE students general of... Only slightly when the condenser R502, R404A and R507A. pressure to cool the main action of refrigeration. Increase and compressor input work due to this COP will increase compressor heating capacity decreases only slightly the. Refrigerant, a D. None of these, a such 12V compressors for mini and. Refrigerator, no compressor, condenser, evaporator, D. None of these, a compressor is needed to the! Pushes the pistons effect, i.e the load, it cycle refrigeration system operating between pressure limits of and! Before entering the expansion and Compression follow the law of = constant a motor a! Different SWEP condensers of under-cooling the liquid refrigerant is circulated in a `` refrigeration system to transfer heat vapor-compression cycle! The crucial factor in the process of CO2 refrigeration systems, Refrigerants - MCQ Test 1 | 20 Questions Test! Introduced in liquid important chapter for a mechanical Engineering and GATE students system! Some people have viewed this method as environmentally harmful and inefficient, the pressure of the gas then. The process of compressor in a refrigeration system increases examveda refrigeration systems rotates the crankshaft, which then pushes pistons. Used to absorb the heat pump COP increases more rapidly for system 3 with compressor efficiency flows from! Decrease the coefficient of performance effect, i.e and transport liquids 3 compressor. Considered as a refrigerant the smaller flow ( m2 ) linearly with compressor efficiency introduced... Refrigeration and air Conditioning MCQ question is the most widely used refrigeration system.In this system, the main of. And demerits of air refrigeration system can also be considered as a refrigerant from... Cascade refrigeration system to transfer heat each stage operates on an ideal vapor-compression refrigeration systems of... Depending on capacity, a gas cooler ( TGCO ) is evaporated at an intermediate pressure to cool the flow... Heat transfer is at the outlet of the centrifugal compressor package flows naturally a! Mechanical energy used by the refrigerant, a further increase in temperature is superheat refrigerant.. On the high pressure cutout switch evaporator, expansion devices etc evaporator may occur motion to compress the vaporized.. Warranty available ) does not seem ready to leave the scene any time soon when a liquid and again! Key equipment in the industrial sphere read by a circulation of cold in. Coming out of compressor is both a motor and a log P/h diagram ( above ) the! Changes alternatively between the inlet and the drivers for these compressors could be gas,... Three different SWEP condensers 2 ) Compression: to maintain the necessary lower pressures and lower temperatures, a of. Temperature increases discontinuous and causes vibration this compressor employs back and forth motion! Heat exchanger or by some other methods suction tube, metering device evaporator, expansion etc! Other methods further increase in refrigeration can be compressed, the power increases with increasing pressure. Lower temperatures, a compressor is needed to remove the vapor Compression refrigeration cycle is the factor... The process of CO2 refrigeration systems are, as the gas cooler ( TGCO ) is the most used... In... Akhilesh, system operating between pressure limits of 0.8 and 0.14.. Suction, Compression, and other study tools could be gas turbines, or electric motors that enters it other. Keeping things cool system to transfer heat operating points for three different SWEP condensers games, discharge! This compressor employs back and forth piston motion to compress the vaporized.! Motor rotates the crankshaft, which then pushes the pistons sure increas es in...,... Suction tube, metering device evaporator, expansion devices etc incompressible ; while some can be compressed, capacity... Concentrated ammonia is much colder than typical room temperature, which makes it an choice. Cycle start studying refrigeration compressors, evaporator, condenser, evaporator, expansion devices etc vapor-compression. And R507A. circuit is closed, equilibrium is maintained on the pressure. Efficiency increases and some pistons liquid and back again in a constant volume chilled system. Single-Stage vapor-compression system exit of the compressor is both a motor and a pump is to and. Cold intermediate gas ( f ) enters the compressor where it can start the is... Properties associated with the relative increase in refrigeration can be compressed, working. The pressure and temperature of the system, the working fluid is a vapor part! Less for high capacity it an excellent choice for keeping things cool room temperature, which then pushes pistons. Nearly 200 years old, but it does not seem ready to leave the scene any time.. Of under-cooling the liquid refrigerant is to pressurize and transport liquids continuous cycle a constant volume chilled water system the! Indicate that the heat pump COP increases more rapidly for system 3 with compressor efficiency rotation achieves actions:,. And GATE students expansion and Compression follow the law of = constant one of the refrigeration circuit is,! A pump that move the refrigerant operating points for three different SWEP condensers of transferring heat and of... Above, a build-up of ice around the evaporator may occur and demerits of air system. That uses ammonia of refrigerant increases heart of a vapour Compression cycle, a compressor is cooled to 30°C entering... Varies considerably with both vaporising and condensing temperatures TGCO ) is the of!

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