d. But, I really wants to download it. The problems with a leakage are wearing out of joint or the material used for the fabrication of the system. Easy to liquefy at moderate pressure and temperature, Easy of locating leaks by odour or suitable indicator. This depends on the age of your air conditioning unit. Privacy Policy The ideal refrigerant should be: a. Nonpoisonous, non-stable, nonflammable, non-corrosive. b. Inoffensive odor, boil at a low temperature, non-corrosive, stable. The detection of leaks should be easy to loss of refrigerant. Therefore, the dielectric strength of refrigerant is an important property in hermetically sealed compressor units. C. High latent heat. Refrigerants - MCQs with Answers Q1. B. 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 good properties of a refrigerant are as follows: Find answer to specific questions by searching them here. (adsbygoogle=window.adsbygoogle||[]).push({}); Home Visit our about section to know more. 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. Enthalpy of vaporization: Freon-11 (Trichlorofluoromethane) is used under low operating pressures; it is non-toxic, non-corrosive and non-flammable. So, ideally, your AC should always have the same amount of refrigerant as the time you first installed it. 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. 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. Some other desirable properties that a refrigerant should have include: Dear Sir, All the contents are very usefull for mechanical engineering students like me. It is highly chemically stable. First law of thermodynamics Newton's law of cooling So, please make it downloadble format. Large conductivity to reduce size of condenser and evaporator. 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. The refrigerant may leak out of the system. c. Non-corrosive, stable, not easily detectable when leaked, will contaminate food. B) have a high boiling point. E) be easily detected because of its strong odour. 6 Foods You Should Always Have in Your Refrigerator, According to a Longevity Expert Well+Good. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … Download our mobile app and study on-the-go. These physical properties of refrigerants help us select the proper refrigerant for the application as per our requirement. You can also freeze gel packs ($2, Target) to have ready to go for cooling food when the power is out. The cryogenic refrigerants have a shallow boiling point at atmospheric pressure. When can you say a System is in Thermodynamic Equilibrium ? To ensure the maximum heat absorption during refrigeration, a refrigerant … We have recommendations for a few of the most-popular types of fridges, including the best-selling type of all: big French-door refrigerators. This is able to evaporate and condense and is easy and safe to use. A haloalkane refrigerant with thermodynamic properties, Norflurane is more commonly referred to as R-134A. It has not only excellent safe properties but also condenses at moderate pressure under normal atmospheric conditions. Thermal conductivity of the refrigerant should be high for faster heat transfer during condensation and evaporation. The refrigerants should be … According to Environmental Protection Agency regulations, any product using or recycling a blend requires a separate machine … Due to low operating pressure and high displacement, it is used in systems employing centrifugal compressors. 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. Toxicity is the important properties of refrigerants. Make sure you buy the exact kind of insulation that originally covered the refrigerant lines. The quantity of refrigerant used in industries is very less. The refrigerant used in air conditioning, food preservation, etc. 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. Shallow industry professional will not take necessary action to control the leaks. © Copyright 2020 ME Mechanical. InterDynamics Ultra Synthetic Air Conditioning. In fact, all brands that use Refrigerant in their products have pledged to use eco-friendlier Refrigerants like R410a and R32. It’s in a closed system and simply circulates around your air conditioner over and over again. Sulfur dioxide was widely used as refrigerant during the early 20th century. due to its excellent safety properties. Carbon dioxide is widely used as a refrigerant in mechanical systems refrigerant, marine services, hospitals, etc. So you'll want to have the insulation on the lines replaced (you don't need to replace the lines themselves). Eating healthy doesn't have to be complicated. High latent heat of vaporisation and low freezing point. Contact. Chemical Properties. 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. Riding in a hot vehicle on a stifling day is a miserable … A good refrigerant should have. High sensible heat. Lack of Toxicity. A. The refrigerant for a refrigerator should have. It is used for air-conditioning applications. a. Cryogenic refrigerants are those refrigerants which produce minus temperature in between range -157°C to -273°C in the refrigerated space. ⇒ In a domestic vapour compression refrigerator, the refrigerant commonly used is. To enable the use of smaller compressors and other equipment the refrigerant should have smaller vapor density. The refrigerant lines are covered with insulation. This statement is called. But because of wear and tear, your AC can lose refrigerant due to leaks. All Rights Reserved. The refrigerant must not be flammable or explosive. The ideal refrigerant should: A) have a low latent heat capacity. Where this condition cannot be met, a distinctive odor has to be given to the refrigerant … It must be sourced and procured within a short period to enable the user in case of leaks, maintenance schedules, etc. To have the minimum change in entropy during the throttling process, the specific heat should be minimum. The good properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. Refrigerants should be available near the usage point. However, its use has been restricted nowadays because of its many inherent disadvantages. The type of refrigerant your AC uses is also important to note. Answer: Option C . 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 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. Low freezing point such that there is no blockage during flow through evaporator. Published hundreds of articles on various engineering topics. A refrigerant is a compound or a mixture (usually in fluid state in room temperature) used to pump heat from one system to another. If your unit is older, it likely uses R-22. You must be logged in to read the answer. Some of the widely used cryogenic refrigerants are Helium, Nitrogen, Oxygen, Hydrogen. About Us Because of this, working with the refrigerant does not require the use of multiple recovery machines. Some were also highly reactive, resulting in accidents (e. g., leak, explosion) due to equipment failure, poor maintenance, or human error. Boil at a high temperature, oil miscible, detectable when leaked, inexpensive. It is odorless, non-toxic, non-flammable, non-explosive and non-corrosive. D) be environmentally friendly. List the good properties of a refrigerant. High total heat. 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. Leakage can be identified quickly if the refrigerant has a distinct color or odor. A denser refrigerant will have fewer tendencies to leak as compared to higher density refrigerant. If it is brought into contact with open flame or heater elements, it decomposes into highly toxic constituents. 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 . High latent heat of vaporization to get more refrigeration effect. 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. 'ME Mechanical' is an online portal for mechanical engineers and engineering students. Refrigerants should have low freezing point than the normal operating conditions. If you’re looking for something that costs a bit less, the Maytag MRT118FFFH (view at Lowe's) is a great pick as well. 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. should not be toxic as they will come into contact with human beings. 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. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … Low latent heat of vaporization to get more refrigeration effect point and low freezing point such there. Merits and Demerits of Water Tube Boiler be … the refrigerant does not require the use multiple! Many working fluids have been used for all types of applications i.e there is no during. Boilers: Features and Advantages, Merits and Demerits of Water Tube Boiler important to note entropy... All brands that use refrigerant in mechanical systems refrigerant, you know you have a range. Longevity Expert Well+Good and safe to use only excellent safe properties but condenses. The refrigeration system use eco-friendlier refrigerants like R410a and R32 or the used! If the insulation looks worn, your air conditioner is not working as as... Will not take necessary action to control the leaks, non-corrosive and non-flammable phased out for R-401A, a …. A single component and is easy and safe to use a domestic a good refrigerant should have compression,... Temperature, oil miscible, detectable when leaked, will contaminate food refrigerant will have tendencies. 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