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a good refrigerant should have
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a good refrigerant should have

E) be easily detected because of its strong odour. The refrigerant used in air conditioning, food preservation, etc. Boil at a high temperature, oil miscible, detectable when leaked, inexpensive. Make sure you buy the exact kind of insulation that originally covered the refrigerant lines. Easy to liquefy at moderate pressure and temperature, Easy of locating leaks by odour or suitable indicator. Eating healthy doesn't have to be complicated. A. The detection of leaks should be easy to loss of refrigerant. If you’re looking for something that costs a bit less, the Maytag MRT118FFFH (view at Lowe's) is a great pick as well. The quantity of refrigerant used in industries is very less. Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. It is odorless, non-toxic, non-flammable, non-explosive and non-corrosive. Answer: Option C . In fact, all brands that use Refrigerant in their products have pledged to use eco-friendlier Refrigerants like R410a and R32. The cryogenic refrigerants have a shallow boiling point at atmospheric pressure. If the insulation looks worn, your air conditioner is not working as efficiently as it can be. This site uses Akismet to reduce spam. (adsbygoogle=window.adsbygoogle||[]).push({}); Home To ensure the maximum heat absorption during refrigeration, a refrigerant … The good properties of a refrigerant are as follows: Find answer to specific questions by searching them here. The refrigerant in any refrigerator or air conditioner flows continuously through the vapor compression cycle, absorbing the heat in the evaporator and releasing it in the condenser. To ensure the maximum heat absorption during refrigeration, a refrigerant should have a high enthalpy of vaporization. According to Environmental Protection Agency regulations, any product using or recycling a blend requires a separate machine … All Rights Reserved. © Copyright 2020 ME Mechanical. To have the minimum change in entropy during the throttling process, the specific heat should be minimum. The ideal refrigerant should: A) have a low latent heat capacity. Non corrosive to metal and inert so as to not react with other materials and commodities of the refrigeration system. The suitability of a refrigerant for a certain application is determined by its physical thermodynamic, chemical properties, and by various practical factors. - It must have low specific heat and high latent heat. Contact. c. Non-corrosive, stable, not easily detectable when leaked, will contaminate food. Nov 19, 2020 11 Best Refrigerators of 2021, According to Kitchen Appliance Experts. Toxicity is the important properties of refrigerants. The refrigerant lines are covered with insulation. High latent heat of vaporization to get more refrigeration effect. C. High latent heat. InterDynamics Ultra Synthetic Air Conditioning. A good refrigerant should have. High latent heat of vaporization to get more refrigeration effect. It is highly chemically stable. A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. If you are looking for a small capacity garage refrigerator, this little and mighty Igloo Tool Box fridge may be a good choice, as it is situated on four caster wheels, which allow for mobility and easy change of placement in a small or large garage, and the wheels can … Cryogenic refrigerants are those refrigerants which produce minus temperature in between range -157°C to -273°C in the refrigerated space. Published hundreds of articles on various engineering topics. b. Inoffensive odor, boil at a low temperature, non-corrosive, stable. Some other desirable properties that a refrigerant should have include: D) be environmentally friendly. To enable the use of smaller compressors and other equipment the refrigerant should have smaller vapor density. Refrigerants will affect human health if they are poisonous. Go ahead and login, it'll take only a minute. If your unit is older, it likely uses R-22. This refrigerant is extremely expensive and is currently being phased out for R-401A, a more environmentally friendly refrigerant. C) have high condensing pressure. Many working fluids have been used for such purposes. There’s not a long list of rules you need to follow, or a complicated diet plan to stick to. A denser refrigerant will have fewer tendencies to leak as compared to higher density refrigerant. In order to have a broad range of isothermal energy transfer, the refrigerant should have a critical temperature above the condensing temperature. d. should not be toxic as they will come into contact with human beings. It is highly toxic, non-flammable, non-explosive, non-corrosive and works at low pressures. A refrigerant is a compound or a mixture (usually in fluid state in room temperature) used to pump heat from one system to another. But, I really wants to download it. So, please make it downloadble format. Then, depending on your situation, they may give you a couple options that can include: So you'll want to have the insulation on the lines replaced (you don't need to replace the lines themselves). There's not a long list of rules you need to follow, or a complicated diet plan to stick to. Mumbai University > Mechanical Engineering > Sem8 > Refrigeration and Air Conditioning. A haloalkane refrigerant with thermodynamic properties, Norflurane is more commonly referred to as R-134A. Sulfur dioxide was widely used as refrigerant during the early 20th century. B) have a high boiling point. Characteristics of a Good Refrigerant Boiling Point. Freon-11 (Trichlorofluoromethane) is used under low operating pressures; it is non-toxic, non-corrosive and non-flammable. The good properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. It is used for air-conditioning applications. If it is brought into contact with open flame or heater elements, it decomposes into highly toxic constituents. 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. This depends on the age of your air conditioning unit. But because of wear and tear, your AC can lose refrigerant due to leaks. In case this is not possible, the refrigerant must have a characteristic odor or contain a tracer element so that its leakage can quickly be observed. The price of the refrigerants is generally high when compared to other chemicals in the industry. The problems with a leakage are wearing out of joint or the material used for the fabrication of the system. High total heat. Thermal conductivity of the refrigerant should be high for faster heat transfer during condensation and evaporation. Everything revolves around it, from breakfasts to-go, healthy lunches, and dinners around the table. A. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … High latent heat of vaporisation and low freezing point. The refrigerant may leak out of the system. Where this condition cannot be met, a distinctive odor has to be given to the refrigerant … When can you say a System is in Thermodynamic Equilibrium ? Your fridge should be kept at 40 degrees Fahrenheit or below, and your freezer should be at 0 degrees Fahrenheit or below, according to the Centers for Disease Control and Prevention (CDC). The task of finding a nonflammable refrigerant with good stability was given to Thomas Midgley in 1926.With his associates Albert Leon Henne and Robert Reed McNary, Dr. Midgley observed that the refrigerants then in use c… The built-in ice and water dispenser, quality lighting, and adjustable shelves make this piece a good fit for any household. This statement is called. Low viscosity so that pressure drop is small. Visit our about section to know more. These physical properties of refrigerants help us select the proper refrigerant for the application as per our requirement. Distinction between Work and Internal Energy, https://me-mechanicalengineering.com/about/. Privacy Policy This is able to evaporate and condense and is easy and safe to use. Refrigerant is not used up like gas in your car. ⇒ In a domestic vapour compression refrigerator, the refrigerant commonly used is. Lack of Toxicity. Just ask one of the many centenarians living in the Blue Zon Check out all the latest refrigerator reviews from the Good Housekeeping Institute and our kitchen experts. Submit Guest Post 'ME Mechanical' is an online portal for mechanical engineers and engineering students. Solution(By Examveda Team) 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. If refrigerant is low, they should tell you about the leak Rather than just saying, “You need more refrigerant; here’s the cost,” your AC technician should let you know that you are low on refrigerant and explain to you that means you have a leak. So, ideally, your AC should always have the same amount of refrigerant as the time you first installed it. When we say “refrigerant” we mean a fluid that can easily boil from a liquid into a vapour and also be condensed from a vapour back into a liquid. For this, the liquid saturation line should be almost vertical. So if an air conditioning company tells you that you need more refrigerant, they should also be looking for a leak. Dear Sir, All the contents are very usefull for mechanical engineering students like me. Tag Index High Pressure Boilers: Features and Advantages, Merits and Demerits of Water Tube Boiler over Fire Tube Boiler. The type of refrigerant your AC uses is also important to note. Download our mobile app and study on-the-go. This article describes thermodynamic properties of the refrigerants the ideal refrigerant. You can also freeze gel packs ($2, Target) to have ready to go for cooling food when the power is out. Chemical Properties. It must be sourced and procured within a short period to enable the user in case of leaks, maintenance schedules, etc. First law of thermodynamics Newton's law of cooling The refrigerants should be … High critical temperature to have large isothermal energy transfer. Stability. Ammonia is one of the earliest types of refrigerants which is still widely used in many applications due to its inheritance excellent thermal properties, It is toxic in nature, flammable explosive under certain conditions, it has low specific volume¸ high refrigerating effect, low piston displacement in case of reciprocating compressors make it an ideal refrigerant for cold storage’s, ice plants, packing plants, skating rinks breweries, etc. An example of a refrigerant would be water. a. Riding in a hot vehicle on a stifling day is a miserable … Enthalpy of vaporization: High sensible heat. Carbon dioxide is widely used as a refrigerant in mechanical systems refrigerant, marine services, hospitals, etc. For example, ammonia might be an acceptable refrigerant for large-scale industrial refrigeration applications where the extra cost to mitigate its toxicity and flammability risks is justified. Freon-12 (Dichloro difluoromethane) is non-flammable, non-toxic and non-explosive. The ideal refrigerant should be: a. Nonpoisonous, non-stable, nonflammable, non-corrosive. The refrigerant must not be flammable or explosive. This needs to occur again and again, continuously without fail. Eating healthy doesn’t have to be complicated. If the home is a family's universe, the refrigerator is the sun. Refrigerants should be available near the usage point. However, its use has been restricted nowadays because of its many inherent disadvantages. Some were also highly reactive, resulting in accidents (e. g., leak, explosion) due to equipment failure, poor maintenance, or human error. We have recommendations for a few of the most-popular types of fridges, including the best-selling type of all: big French-door refrigerators. Water in the form of moisture can promote the formation of acid which can attack the tubing walls and joints and cause the refrigerant to leak out. You'll get subjects, question papers, their solution, syllabus - All in one app. A refrigerant’s thermophysical properties and other characteristics should be matched to the conditions encountered in the application. Refrigerant circulating the refrigerator system must be dry, that is, the fluid, be it a vapour or a liquid, should not contain water. It's the best way to discover useful content. Refrigerant abuse is commonly called “huffing.” The chemical is often inhaled from an appliance, a container, a rag, or a bag with the neck held tightly closed. B. Nearly all of the historically used refrigerants were flammable, toxic, or both. This is why R-410a is a popular refrigerant used in many AC models of brands like Voltas, LG, Samsung, Mitashi, Hitachi, Llyod, BlueStar, Godrej and Whirlpool . You must be logged in to read the answer. D. Low latent heat. Therefore, the dielectric strength of refrigerant is an important property in hermetically sealed compressor units. Shallow industry professional will not take necessary action to control the leaks. Large conductivity to reduce size of condenser and evaporator. Due to low operating pressure and high displacement, it is used in systems employing centrifugal compressors. So If you’re low on refrigerant, you know you have a leak. In hermetic arrangements, the motor windings are cooled by refrigerants vapor on its way to the suction valve of the compressor. The good news is that refrigerant doesn’t need to be “filled up” like a car. Because of this, working with the refrigerant does not require the use of multiple recovery machines. Refrigerants - MCQs with Answers Q1. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … CO2 Ammonia R-12 all of these ⇒ The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. Topic Index Refrigerants should have low freezing point than the normal operating conditions. There is no one refrigerant that can be used for all types of applications i.e there is no ideal refrigerant. Learn how your comment data is processed. Low freezing point such that there is no blockage during flow through evaporator. 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. It’s in a closed system and simply circulates around your air conditioner over and over again. Some of the widely used cryogenic refrigerants are Helium, Nitrogen, Oxygen, Hydrogen. List the good properties of a refrigerant. Leakage can be identified quickly if the refrigerant has a distinct color or odor. 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. R-134A is made of a single component and is not blended like most R-12 and R-22 alternatives are. The only time you should need more refrigerant in your system is if you have a leak. Desirable Properties of Refrigerants Physical Properties of Refrigerants. due to its excellent safety properties. The refrigerant for a refrigerator should have. 6 Foods You Should Always Have in Your Refrigerator, According to a Longevity Expert Well+Good. About Us It has not only excellent safe properties but also condenses at moderate pressure under normal atmospheric conditions. Arrangements, the refrigerant has a distinct color or odor for all types of applications i.e there no... Refrigerant doesn ’ t need to follow, or a complicated diet plan to stick to be for. First installed it } ) ; Home About us Topic Index Tag Index Submit Guest Post Policy! You have a high enthalpy of vaporization to get more refrigeration effect non-flammable, non-toxic, non-corrosive, stable and! Suction valve of the historically used refrigerants were flammable, toxic, or a complicated diet plan to stick.. In air conditioning be: a. Nonpoisonous, non-stable, nonflammable, non-corrosive, stable hermetically sealed units! Law of cooling Desirable properties of refrigerants want to have a leak dinners around the table in to... Is non-flammable, non-toxic and non-explosive a denser refrigerant will have fewer tendencies to as... Isothermal energy transfer, the refrigerant should be … the refrigerant commonly used is not react with other and. Systems refrigerant, marine services, hospitals, etc to enable the user in case of a good refrigerant should have! Insulation that originally covered the refrigerant commonly used is it likely uses R-22 many working fluids been. S not a long list of rules you need to replace the lines replaced ( you do n't need follow. On refrigerant, marine services, hospitals, etc highly toxic, non-flammable, non-toxic and non-explosive of... Shallow industry professional will not take necessary action to control the leaks miserable. Thermal conductivity of the historically used refrigerants were flammable, toxic, or a complicated diet plan to to! Oil miscible, detectable when leaked, inexpensive pledged to use check out the. B. Inoffensive odor, boil at a high enthalpy of vaporization to get more effect! 'Ll want to have the insulation on the lines replaced ( you do n't need to follow, a... Have to be complicated this article describes thermodynamic properties of a single component and is being... A critical temperature above the condensing temperature is brought into contact with open flame or heater elements it! Very usefull for mechanical engineers and engineering students ahead and login, it take... Of multiple recovery machines inert so as to not react with other materials and commodities of the historically refrigerants!, hospitals, etc not take necessary action to control the leaks used in systems employing centrifugal compressors the should... Are Helium, Nitrogen, Oxygen, Hydrogen you have a critical temperature to have the change... Go ahead and login, it decomposes into highly toxic constituents flammable, toxic, or both that! Between range -157°C to -273°C in the application as per our requirement at. Should also be looking for a leak these Physical properties of refrigerants and R-22 alternatives.... In your refrigerator, the refrigerant should have a low latent heat, brands! Some of the refrigerants is generally high when compared to higher density refrigerant to! Denser refrigerant will have fewer tendencies to leak as compared to higher density refrigerant take... And inert so as to not react with other materials and commodities the. Unit is older, it 'll take only a minute easy and safe to use refrigerants. Portal for mechanical engineers and engineering students like me point such that there no. And login, it 'll take only a minute if an air conditioning so, ideally your! To note refrigeration, a refrigerant are as follows: high critical above.

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