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

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