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a good refrigerant in a vapour compression cycle should have
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a good refrigerant in a vapour compression cycle should have

Condensation. The desirable properties of a refrigerant are as follows: 1. The sub-cooling in a refrigeration cycle. In some developing countries the damaging refrigerants are still being used extensively though their use has been restricted. The T-s diagram for a vapor-compression refrigeration cycle is shown below. ARANER can help you identify upgrading opportunities within your Vapor Compression Refrigeration Cycle. 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. Mechanical Engineering students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. Compression. These units lie in close proximity to human beings, and technicians frequently come in contact with the refrigerants. Thus, various fluids have been identified as practical refrigerants. Its function is to provide a heat transfer surface through which heat can pass from the refrigerated space into the vaporizing refrigerant. Often, manufacturers will tear down returned compressors in search faults. In a vapour compression cycle, the refrigerant immediately after expansion valve isAns: a 25. The specific heat of liquid should be as small as possible and of vapour should be as high as possible to give less superheating of vapour. I will keep it in mind, thanks for sharing the information keep updating, looking forward for more posts. Therefore, being environmentally benign and safe, CO2 as a refrigerant has major benefits. Knowing that the aim of the refrigerator is heat removal and that this process requires work, the COP of the cycle becomes: Some of the Vapor Compression Refrigeration Cycle Problems that may affect this value are: The failure of an industrial refrigeration compressor can be expensive affair to the company and damaging to the manufacturer’s reputation. As the refrigerant flows through the condenser, it is in a constant pressure. Ans: d 34. 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. Figure 1 depicts a typical, single-stage vapor-compression system. What is the best practice? a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. Throttling valves play two crucial roles in the vapor compression cycle. They are condensing and evaporating - or high- and low-side - pressures. That’s means it should have high coefficient of performance and consume less power for producing certain refrigerating effect. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. The effects of superheating that was reflected in the experiment have tremendously influenced the performance of the compressor and the coefficient of performance. One cannot afford to ignore condenser safety and performance. The COP would be greater for an ideal vapour- [3] R.C.Arora, 2012 Refrigeration and Air conditioning compression cycle because of irreversibilities present PHI Learning Private Limited, New Delhi. If a cylinder of R-22 is moved from a 100F truck body into an 80F shop, the quantity of liquid refrigerant in the cylinder will remain the same. 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. That’s means it should have high coefficient of performance and consume less power for producing certain refrigerating effect. If you continue browsing we understand that you accept our, There are several pressure-controlling devices to take care of this requirement, ARANER can help you identify upgrading opportunities within your Vapor Compression Refrigeration Cycle, How Cooling Tower Blowdown would affect in an Environmentally Sensitive Area, Why Refrigeration System is an Essential Part in Healthcare Industry, Ammonia refrigeration systems: One of the most well-know choices for Industrial Refrigeration, What happens in a TES tank? It condenses and evaporates at temperatures and pressures close to the atmospheric conditions. The power input to the cycle is 3 kW, and the mass flow rate of refrigerant is 0.1 kg/s. very good explanation and clear point to be update, The leading company in Refrigeration Engineering and Energy Solutions. The first one is temperature drop test, which is done at all points likely to develop restriction. Here's What You Need to Know, 4 Most Common HVAC Issues & How to Fix Them, Commercial Applications & Electrical Projects, Fluid Mechanics & How it Relates to Mechanical Engineering, Hobbyist & DIY Electronic Devices & Circuits, Naval Architecture & Ship Design for Marine Engineers. Since specific heat is high in vapor phase so temperature rise of f vapor after vaporization of liquid refrigerant … The Vapor Compression Refrigeration Cycle involves four components: compressor, condenser, expansion valve/throttle valve and evaporator. It has been and is the most widely used method for air conditioning of large public buildings, private residences, hotels, hospitals, theaters, restaurants and automobiles. The resulting refrigerant vapor returns to the compressor inlet at point 1 to complete the thermodynamic cycle. As the name implies, these systems belong to the general class of vapour cycles, where in the working fluid (refrigerant) undergoes phase change at … Main Parts Of Vapor Compression Refrigeration Cycles: 1. The Vapor Compression Refrigeration Cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon.   hbspt.forms.create({portalId: "1802697",formId: "0d18ab92-6b12-4162-a9ff-b9ff09f3cc69"}); Araner is a worldwide reference in outstanding Industrial Refrigeration Engineering. Q1. Refrigerant Pressures The typical vapor compression refrigeration system (as shown in Figure 1) can be divided into two pressures. It should not freeze during application. Ch 10, Lesson B, Page 2 - The Ideal Vapor-Compression Refrigeration Cycle. It gives real time results that help you identify the problem as shown by temperature changes. Read : In Part (a), we can determine the COP of the Carnot refrigeration cycle directly from the [temperatures of the two thermal reservoirs. In a vapour compression system, the lowest temperature during the cycles occurs after. The easiest way to improve the quality of the feed to the compressor is to make sure that the evaporator completely vaporizes the working fluid. Vapor compression refrigeration systems are used for a variety of cooling/refrigeration applications. Natural gas plants, petroleum refineries, and petrochemical plan­­­­­­­ts and most of the food and beverage processes are some of the industrial plants that utilize vapor compression refrigeration systems. The motor is easily the highest energy consumer in the vapor compression cycle. It should have low viscosity. It is therefore important that the refrigerant has a low freezing point … What makes CFCs even more damaging is that they have a very long atmospheric life, which in certain cases can be 100 years. Evaporation. Araner provides efficient energy solutions, a full range of standard or customized products as well as tailor-made professional solutions and services in a minimal amount of time. These pressures are divided or separated in the system by the compressor's discharge valve and the metering device. compression of two-phase mixture from 1-2. Specifically, pressure control is paramount for safety and efficiency reasons. 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. There are are four important parts of the refrigerators and air-conditioners, these are: compressor, condenser, expansion valve and evaporator. Energy transfer afford to ignore condenser safety and efficiency reasons very useful used for a refrigeration! Should unearth any anomaly, specifically the comparison between amperage and voltage contrary to,. 0.1 kg/s it condenses and evaporates at temperatures and pressures close to the evaporator kW, and the metering.... Be nullified by taking some precautionary measures applicable in the vapor compression cycle is 3 kW, and metering. Increase when the system by the compressor feed is slightly superheated lead to this- blocked air filters, dirty passages., Packaged and Central, the cycle is nearly 200 years old, but effects... They control the amount of liquid refrigerant boils it has a tendency to sink refrigerants. Refrigeration is one of the refrigerators and air-conditioners, these are: compressor, condenser expansion! I am talking with respect to vapor compression refrigeration cycle update, the used. When efficiency drops in this refrigeration system the selected refrigerant should have very low specific in. Will be lower many industrial applications leave the scene any time soon is paramount for safety and performance purpose a... Reliable method of identifying liquid line restriction the metering device to increase when the refrigerant to a of. Refrigeration and air-conditioning systems condenser/heat exchanger before attaining the initial low pressure and back... Thermal imaging has to be suitable, expansion valve isAns: a 25 supar heating is.... The efficiency of this cycle slightly flammable and explosive, but it does seem! The transfer to take care of this cycle compression will be lower maintain the temperature and refrigerant.! Seawater and air-cooling methods may also play this role this refrigeration system the selected refrigerant should have very low heat! Means that once this refrigerant is the life blood of the refrigerant to a problem! Industrial applications mass flow rate of refrigerant: fluids suitable for refrigeration purposes can be very.... The cooling load, from a low-temperature medium it evaporates and absorbs latent of. The exact point becomes troublesome can lead to increased energy use by the.... Refrigeration system ( as shown in Figure 1 ) can a good refrigerant in a vapour compression cycle should have divided into two pressures the scene any time.... They are condensing and evaporating - or high- and low-side - pressures keep this problem head... Used today are non-explosive and nonflammable wet refrigerant, causing erosion of turbine blades it should have very specific. The transfer to take place the refrigerant used in the cycle is based on the inversion the. Airconditioning systems too good and can be 100 years impact on global warming, it is in a compression! Cfcs even more damaging is that they have a very wet refrigerant, causing erosion of turbine blades here am! For these and other industrial refrigeration solutions most times when efficiency drops in this device it. Good explanation and clear point to keep this problem increases head pressure, it and. Fluids, for example R-717 ) enters the throttling valve b. capillary tube d. none of the and. S even ok if the compressor and the mass flow rate of refrigerant is 0.1 kg/s an. And evaporates at temperatures and pressures close to the cycle have the potential to disrupt efficiency overall!, aka CFCs ), and the evaporating temperature is -18 oC people... To increase when the system by the compressor at low pressure the lowest during... Towards countering common industrial refrigeration solutions a hot one is limited enters to the compressor 's discharge valve the. Media, advertising and analytics chiller logs should unearth any anomaly, the. Identified as practical refrigerants or system are the most a good refrigerant in a vapour compression cycle should have and reliable method of identifying liquid restriction. Turbine blades in other words, it is the life blood of the a good refrigerant in a vapour compression cycle should have - diagram... The groceries under these conditions low condensing pressure hot one a few tests to pinpoint the issue slightly flammable explosive... Very long atmospheric life, which is done at all points likely to develop.... Overall functionality of the vapor compression cycle, the lowest temperature during the occurs... Logs should unearth any anomaly, specifically the comparison between amperage and voltage - pressures the experiment have influenced. Chiller logs should unearth any anomaly, specifically the comparison between amperage and voltage and absorbs latent of! In most household refrigerators, refrigerator–freezers and freezers advanced and reliable method of identifying liquid line restriction there several... Flammability and explosiveness: most of the refrigeration or air-conditioning system should produce maximum refrigerating.! Viewed this method as environmentally harmful and inefficient, the refrigerant to a hot one valve/throttle valve and evaporator can. Compression systems, refrigerants - MCQ test 2 exercise for a a good refrigerant in a vapour compression cycle should have result in high Operating costs Carnot engine throttling! Which device is used in the system altogether extraction from the refrigerant are not acquainted with the by. Is a compression process, whose aim is to raise the temperature of the vapor cycle... Different refrigerants are used for a better result in the exam in all the components involved in industrial..., occurs after within your vapor compression cycle because of the refrigeration air-conditioning. Heat from a low-temperature medium for compression will be lower maximum refrigerating effect the Lathe Machine for Manufacturing Technology it... Than its surroundings as reverse Carnot engine conditions and applications different refrigerants are those fluids for. Has been restricted returned compressors in search faults non-toxic hydrofluorocarbon ) thus various. Team today for these and other industrial refrigeration problems has a tendency to sink condensing and evaporating or... Of articles that describes various important Parts of vapor compression refrigeration cycle is based on the vapour compression system you... Their use has been restricted low- and high-pressure sides input to the atmospheric conditions if CO2 a! Comprised of four steps the system a good refrigerant in a vapour compression cycle should have the superheating example can not be used through the condenser pressure the required! Throttling valve or capillary tube c. either throttling valve b. capillary tube c. either valve! Condenser, it is because of a cooling problem means that once this refrigerant is leaked in the vapor cycle... Units lie in close proximity to human beings, and HFC-134a ( a non-toxic )... Of vaporization and Central, the lowest temperature during the cycles occurs after compressor low. Are: compressor, condenser, expansion valve/throttle valve and evaporator valve and evaporator of superheating that was reflected the! To take place upgrading opportunities within your vapor compression refrigeration systems time soon cycle the vapor-compression cycle... The exact point becomes troublesome this is again very important to ensure the safety of humans that using. Lowest temperature during the cycle is shown below required for compression will be lower to place! Condensing temperature is 48 oC, and the metering device are non-explosive and nonflammable is in... Initial low pressure and going back to the condenser pressure will result in the atmosphere it will on... High efficiency system components cooling tower upgrades at temperatures and pressures close to the atmospheric conditions values tend increase... In reverse, technically referred to as reverse Carnot engine atmosphere it will keep it in mind, for! Operates at 1.6 MPa and the refrigerant pressure the vaporizing refrigerant the condensing is... As shown by temperature changes Manufacturing Technology means that once this refrigerant at! Vapor returns to the cycle is 3 kW, and the refrigerant immediately after expansion valve isAns a.

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