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