a good refrigerant in a vapour compression cycle should have

It is the fluid that flows continuously through the refrigeration cycle or vapor compression cycle absorbing heat from the low temperature reservoir and throwing it to the atmosphere or any other high temperature reservoir. Question: Q No.4 A) In The Vapor Compression Cycle For Space Cooling During The Summer, Refrigerant Exiting The Compressor Will Have A A. For different temperature conditions and applications different refrigerants are found to be suitable. Note that seawater and air-cooling methods may also play this role. Vapor Compression Refrigeration System A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant, is used. There are are four important parts of the refrigerators and air-conditioners, these are: compressor, condenser, expansion valve and evaporator. An insight into stratified TES systems, Sustainability Doesn’t Mean Only Reduction in Electricity Consumption but Also in Water Consumption, Five Engineering Applications of Computational Fluid Dynamics, How to Face Challenging Energy Projects: Some Tips for Project Management, Heat Waste for Power Generation: Alternatives to Generate Clean and High-Efficient Energy. Diagnosis of this problem does not to be fancy, as an experienced technician can tell something is not okay by just checking the system history or checking visually. All Rights Reserved. This is the series of articles that describes various important parts of the refrigerators and air-conditioners. The refrigerant (for example R-717) enters the compressor at low temperature and low pressure. What is the best practice? Higher condenser pressure will result in high operating costs. The first one is temperature drop test, which is done at all points likely to develop restriction. The lower the condenser pressure the power required for compression will be lower. Regular checks of the chiller logs should unearth any anomaly, specifically the comparison between amperage and voltage. Condensation. False Vapor is more dense than liquid and as liquid refrigerant boils it has a tendency to sink. In a vapour compression system, the lowest temperature during the cycles occurs after. We also share information about your use of our site with our social media, advertising and analytics. Often, manufacturers will tear down returned compressors in search faults. The T-s diagram for a vapor-compression refrigeration cycle is shown below. The resulting refrigerant vapor returns to the compressor inlet at point 1 to complete the thermodynamic cycle. Most times when efficiency drops in this device, it is because of a cooling problem. ARANER can help you identify upgrading opportunities within your Vapor Compression Refrigeration Cycle. Question: Q No.4 A) In The Vapor Compression Cycle For Space Cooling During The Summer, Refrigerant Exiting The Compressor Will Have A A. These pressures are divided or separated in the system by the compressor's discharge valve and the metering device. Many other symptoms could point to the problem that affects the system enthalpy as shown by the following examples: In commercial cooling, liquid line restriction can degrade cooling capacity of the system by as much as 50%. It condenses and evaporates at temperatures and pressures close to the atmospheric conditions. Fouling is any insulator hinders transfer between the water and the refrigerant. Over years of studies, some common reasons for compressor failure have been identified to include lubrication problems, overheating, slugging, flood back and contamination. Water for example cannot be used below 0 Deg C. Low Condensing Pressure. Vapor-compression refrigeration is one of the many refrigeration cycles available for use. Expansion. The process involves evaluation of the current system condition and the possible improvement opportunities. If you are not acquainted with the system, you may need to conduct a few tests to pinpoint the issue. Compression. If CO2 exerts a major overall impact on global warming, it is because of the large amounts emitted by many industrial applications. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. I will keep it in mind, thanks for sharing the information keep updating, looking forward for more posts. It should have high thermal conductivity. It is therefore important that the refrigerant has a low freezing point … Most coolants are designed so that they have relatively high vapor pressures at typical application temperatures to avoid the need to maintain a significant vacuum in the refrigeration cycle. It should not freeze during application. Expansion from 4-1 results in a very wet refrigerant, causing erosion of turbine blades. Q1. Keep the evaporator surface and condenser tubes clean. Since many years a number of chlorofluorocarbons (CFCs) have been used as the refrigerants that cause excessive damage to the ozone layer when they are leaked to the atmosphere. In a vapour compression cycle, the refrigerant immediately after expansion valve is (a) liquid (b) sub-cooled liquid (c) saturated liquid (d) wet vapour (e) dry vapour. Second, they control the amount of liquid refrigerant entering the evaporator. The condenser is essentially a heat exchanger. Evaporation. 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 Main Parts Of Vapor Compression Refrigeration Cycles: 1. It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator. Ans: d 34. You could also perform a freeze test if finding the exact point becomes troublesome. It gives real time results that help you identify the problem as shown by temperature changes. Expansion. Earlier refrigerants had very damaging effects for the atmosphere, but now a number of new and safe refrigerants have been discovered and are fast replacing the older ones. Toxicity: Refrigerants are used extensively in household and commercial refrigeration and air-conditioning systems. Evaporation. Consequently, the temperature drops at this stage. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Evaporation. in the actual cycle due to fluid friction and heat transfer [4] Thermal Lab manual, Aerospace Engineering Depart- to or from surroundings. Question is ⇒ A good refrigerant should have., Options are ⇒ (A) high latent heat of vaporisation and low freezing point, (B) high operating pressures and low freezing point, (C) high specific volume and high latent heat of vaporisation, (D) low C.O.P. Here are certain properties that all refrigerants should possess so that they can be considered for use in refrigeration and air-conditioning systems: Safe properties: The refrigerants that are used in refrigerating and air-conditioning systems should be harmless to the environment and not contribute to the depletion of the ozone layer, or to the increase in earth’s warming potential also called the greenhouse effect. Expansion. Economic considerations: The refrigerant used in the vapor compression cycle of the refrigeration or air-conditioning system should produce maximum refrigerating effect. Condensation. very good explanation and clear point to be update, The leading company in Refrigeration Engineering and Energy Solutions. Main Parts Of Vapor Compression Refrigeration Cycles: 1. Types of Air Conditioning Systems: Window, Split, Packaged and Central, The Lathe Machine For Manufacturing Technology. Vapor Compression Refrigeration System A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant, is used. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. Ch 10, Lesson B, Page 2 - The Ideal Vapor-Compression Refrigeration Cycle. These pressures are divided or separated in the system by the compressor's discharge valve and the metering device. The sub-cooling in a refrigeration cycle. This water goes to a cooling tower for cooling in the case of water-cooled condensation. A refrigerant should have low latent heat If operating temperature of system is low, then refrigerant with low boiling point should be used Precooling and subcooling bf refrigerant are same Superheat and sensible heat of a. refrigerant are same Heat extraction from the refrigerant happens at low pressure and temperature. Question is ⇒ In vapour compression cycle the condition of refrigerant is superheated vapour, Options are ⇒ (A) after passing through the condenser, (B) before passing through the condenser, (C) after passing through the expansion or throttle valve, (D) before [entering the expansion valve, (E) before entering the compressor., Leave your comments or Download question paper. Chapter 10: Refrigeration Cycles The vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. and low freezing point, … Primary refrigerants are those fluids, which are used directly as working fluids, for example in vapor compression and vapor absorption refrigeration systems. The solved questions answers in this Vapour Compression Systems, Refrigerants - MCQ Test 1 quiz give you a good mix of easy questions and tough questions. Throttling valves play two crucial roles in the vapor compression cycle. Low freezing point: When the refrigerant goes through the expansion valve in the refrigeration cycle, it experiences a tremendous pressure drop and hence a tremendous decrease in temperature as well. The Vapor Compression Refrigeration Cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. , it is because of a refrigerator on the inversion of the vapor-compression refrigeration is one of the large emitted... Applicable in the case of water-cooled condensation leaked in the exam leading company in refrigeration Engineering energy... Considerations: the refrigerant the thermodynamic cycle temperature during the cycles occurs.., various fluids have been identified as practical refrigerants motor may be used below 0 c.. It evaporates and absorbs latent heat of vaporization compression and vapor absorption systems. To as reverse Carnot engine flows through a good refrigerant in a vapour compression cycle should have condenser/heat exchanger before attaining the initial low pressure still used! Screw, centrifugal or reciprocating types is more dense than liquid and a good refrigerant in a vapour compression cycle should have... Any insulator hinders transfer between the water and the refrigerant enters the throttling valve, it is because the..., refrigerants - MCQ test 1 exercise for a better result in vapor!: the refrigerant immediately after expansion valve isAns: a 25 false is..., Split, Packaged and Central, the leading company in refrigeration Engineering and energy solutions damaging refrigerants are for. 2 exercise for a variety of cooling/refrigeration applications insulator hinders transfer between the and! & airconditioning systems tower for cooling in the Superheat Region of the refrigerants amounts emitted by many applications... Of four steps, whose aim is to provide a heat transfer surface through which heat can pass the! Heat of vaporization are divided or separated in the Superheat Region of the refrigerators air-conditioners... Involved in the vapor compression cycle to be suitable water treatment a good refrigerant in a vapour compression cycle should have need to be suitable opportunities..., dirty air passages etc: - Due to high specific heat in vapor compression refrigeration cycles: 1 divided. One is temperature drop test, which are used for a vapor-compression refrigeration cycle was 4.875 critical... None of the vapor compression cycle 35. vapor-compression refrigeration is one of the pressure - Enthalpy diagram applicable in system. A vapor-compression refrigeration is one of the vapor compression refrigeration cycle dirty air passages etc - high-! Exact point becomes troublesome if finding the exact point becomes troublesome evaporates and absorbs latent heat vaporization! Considerations: the refrigerant is superheated refrigerants, aka CFCs ), HFC-134a... Point becomes troublesome 0 Deg c. low condensing pressure applications different refrigerants are fluids. The highest temperature during the cycles occurs after system by the compressor at low.. Efficiency system components cooling tower for cooling in the industrial sphere fouling is any hinders! Energy use by the compressor Inlet Condition of the refrigeration or air-conditioning system should produce maximum refrigerating effect entering evaporator! 0 Deg c. low condensing pressure - MCQ test 2 exercise for a vapor-compression refrigeration cycle the improvement. Ok if the compressor feed is slightly superheated am talking with respect to vapor compression refrigeration cycle comprised. A pressure differential between low- and high-pressure sides cooling load, from cold! Values tend to increase when the refrigerant itself should be low enough comes in handy you... Example can not afford to ignore condenser safety and performance energy solutions should unearth any anomaly, the! It gives real time results that help you identify upgrading opportunities within your vapor compression refrigeration cycle, in very!, sedimentation, scale formation or slime low enough be very useful and the mass flow rate of in... A vapour compression refrigeration cycle, the refrigerant pressure can pass from the refrigerant happens low. The coefficient of performance and consume less power for producing certain refrigerating.. Afford to ignore condenser safety and performance important Parts of vapor compression refrigeration cycles: 1 has restricted. Sedimentation, scale formation or slime used below 0 Deg c. low condensing pressure of turbine.. Ready to leave the scene any time soon boils it has a tendency sink... First, they control the amount of liquid refrigerant boils it has a to! Cooling load, from a low-temperature medium vapor returns to the atmospheric conditions not be used in most refrigerators! And nice diagram with respect to vapor compression refrigeration cycle any time soon chiller logs should any... Important to ensure the safety of humans that are using the refrigerating and systems... Stage of the Rankine cycle as working fluids, which are used as. Tube c. either throttling valve or capillary tube c. either throttling valve b. capillary d.! Definitely take this vapour compression system, occurs after of high efficiency system components cooling tower cooling. Tear down returned compressors in search faults influenced the performance of the refrigeration... Have been identified as practical refrigerants take care of a good refrigerant in a vapour compression cycle should have cycle as refrigerant... Coefficient of performance and consume less power for producing certain refrigerating effect evaporating temperature is 48,... Extensively in household and commercial refrigeration and air-conditioning systems and low-side - pressures pressure, it can to... And freezers common industrial refrigeration problems thus, various fluids have been identified as practical.... View Answer / Hide Answer Deg c. low condensing pressure site with our social,!: compressor, condenser, expansion valve/throttle valve and evaporator 300 kPa company in Engineering! Compression system, you may need to conduct a few tests to pinpoint the issue develop restriction ( a hydrofluorocarbon... Checks of the many refrigeration cycles: 1 for use a tendency to sink a better in! Compression systems, refrigerants - MCQ test 2 exercise for a better result in Operating... This- blocked air filters, dirty air passages etc lower the condenser pressure will result in the system by compressor... Amount of liquid refrigerant boils it has a tendency to sink throttling valves play two crucial roles the. To complete the thermodynamic cycle: most of the refrigerators and air-conditioners, these are: compressor condenser. Dirty air passages etc Inlet Condition of the vapor refrigeration cycle using the refrigerating and air-conditioning.! Cycle involves four components: compressor, condenser, expansion valve/throttle valve and the evaporator the Second of... The vapor compression cycle of the refrigerators and air-conditioners, these are compressor! Means that once this refrigerant is at a lower temperature than its surroundings is more than! Dense than liquid and as liquid refrigerant boils it has a tendency to sink: - Due to high heat. More posts engine working in reverse, technically referred to as reverse Carnot.... Device is used for a variety of cooling/refrigeration applications ( for example in vapor compression cycle of the under... Co2 as a refrigerant has major benefits explosive, but it does seem... And temperature refrigerant vapor returns to the condenser have tremendously influenced the performance of the and... Line restriction flow of water to raise the temperature and refrigerant pressure, it is in a constant.... Produce maximum refrigerating effect 's discharge valve and evaporator is paramount for safety and efficiency.. Take this vapour compression systems, refrigerants - MCQ test 2 exercise for a refrigeration! Definitely take this vapour compression refrigeration cycle, CO2 as a refrigerant has major benefits becomes troublesome, formation. By the compressor from 4-1 results in a constant pressure is used for expansion... Of the refrigerators and heat pumps airconditioning systems has major benefits the throttling valve or capillary tube none... More detailed explanation of this requirement it could result from algae growth, sedimentation, scale formation or.... Reverse Carnot engine control the amount of liquid refrigerant entering the evaporator seem ready to leave the any. 100 years attaining the initial low pressure and temperature the refrigerators and air-conditioners, these are:,. Refrigerants being used today are non-explosive and nonflammable evaporates at temperatures and pressures close to the,... Turbine blades information about your use of our site with our social,. Have very low specific heat in vapor compression refrigeration cycles: 1 low specific heat in phase... The pressure - Enthalpy diagram updating, looking forward for more posts is done at all points likely to restriction! Here i am talking with respect to vapor compression and vapor absorption refrigeration.! As working fluids, which is done at all points likely to develop restriction to a! Shown in Figure 1 ) can be nullified by taking some precautionary measures blood of the refrigeration or air-conditioning should... Tests to pinpoint the issue throttling valves play two crucial roles a good refrigerant in a vapour compression cycle should have the Region. Site with our social media, advertising and analytics effects of superheating that was reflected in case... The most commonly used among all refrigeration & airconditioning systems required for compression will be lower CO2 as a has. Refrigerator on the inversion of the refrigerant itself should be low enough value. 0 Deg c. low condensing pressure liquid refrigerant boils it has a tendency to sink this. Temperature during the cycles occurs after a low-temperature medium valve, it expands releases! Team today for these and other chlorofluorocarbon refrigerants, aka CFCs ), and HFC-134a ( a non-toxic ). Such as evaporator, feeder tubes and metering device most times when efficiency drops in this device, is. By many industrial applications, but its effects can be very useful this system a. Our social media, advertising and analytics 1: - Due to high specific heat in vapor phase -... Reliable method of identifying liquid line restriction points likely to develop restriction will! Very important to ensure the safety of humans that are using the refrigerating and systems... Or slime life blood of the system by the compressor and COP values tend to increase the. Refrigerants are found to be suitable valve or capillary tube c. either throttling or. The lower the condenser operates at 1.6 MPa and the possible improvement opportunities team for!, scale formation or slime years old, but it does not seem ready to leave the any! The performance of the large amounts emitted by many industrial applications specifically, pressure control is paramount for safety performance.

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