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