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

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