The ideal refrigerant has good thermodynamic properties, is noncorrosive, and safe. The desirable property of a refrigerant is. Read More: MCQ Type Questions and Answers. Low boiling point. A high gain amplifier is an example where noise must be low. Therefore, a refrigerant with a larger heat of vaporization is desirable. Applied loads are Nx = 1.5 kN/mm, Ny = 1.0 kN/mm, Neglect temperature and hygral effects. Thermodynamic Properties The liquid has to vapourise at the evaporator coil to cause cooling. 7 years ago, Posted For example, in a regular home refrigerator, a Class A and Class 1 substance are used. R-22 refrigerant was made in the late 1990’s to temporarily replace R-12 due to its lower ODP. The R22 refrigerant which is used as an alternative to CFC-included refrigerants, has got a low ODP value and thus, its use is permitted until the year 2030. Previous question Next question Find strains in material directions... an oil and gas company consider drilling four oil wells. © 2007-2021 Transweb Global Inc. All rights reserved. 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 desirable combination of properties for a... Posted Determine and draw the output waveform whena) Op-Amp is ideal.b) Open- loop gain of Op-Amp is 500000.c) Write the... 1- A 1-D slab, 0 = x = L, is initially at zero temperature. Chemical Properties Toxicity. It is very commonly used in refrigerators, air-conditioners and freezers. 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. Safety features include flammability and toxicity, in conjunction with the inventory required. Calculate the power of pump used in the system. High Vapor Density. Also, find the change in the volume of the... Water at 20°C is being pumped from tank 1 to tank 2 with given conditions. They include air, calcium-chloride brine, sodium-chloride (salt) brine, alcohol, and similar non-freezing solutions. The article focuses on the criteria for refrigerant selection, including discussion of the transitional refrigerants (HCFCs), chlorine-free refrigerants (HFCs), and halogen-free refrigerants. The desirable properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. of saturated liquid at temperature T sat , the In an industrial setting where more safety measures are in place and more refrigeration is needed, a Class B and Class 2 refrigerant … This article describes thermodynamic properties of the refrigerants the ideal refrigerant. It is immersed in boiling water at 100°C for 15 min. See the answer. D. All of these. Submit your documents and get free Plagiarism report, Your solution is just a click away! R-12 refrigerant, once the most popular refrigerant on the market, was banned in the early 1990’s for contributing to the greenhouse gas effect and all production ceased in 1994. The thermodynamic properties of a fluid include its vapor pressure, density, and heat capacity, and these determine the operating pressures of a refrigeration system along with having a substantial impact on the energy efficiency. For some resistors it is important to have low noise properties. An egg, which for the purposes of this problem can be assumed to be a 5-cm-diameter sphere having the thermal properties of water, is initially at a temperature of 4°C. What is a Refrigerant; desirable properties of a refrigerant; Commonly used refrigerants are Carbon dioxide, sulphur dioxide, ammonia, Freon-11, Freon-12 and Cryogenic refrigerants. Determine the... For a [0/45]s glass/epoxy laminate, find the coefficients of the thermal expansion. In nucleate boiling heat transfer from a cylinder of diameter D with surface temperature T w to a pool Low boiling point. 14 hours ago. This is a good assumption when the heat transfer coefficient is low or the strip thermal conductivity high, because then... 1) Think about a plate subject to biaxial stress tension loading (s 1 =150MPa and s 2 =180MPa) with a through crack of length 16 mm, oriented at an angle ß=45 o from -x axis. (Both tanks are open to atmosphere). Parasitic inductance and … Heat is transferred to the container until it is filled with saturated steam. As a result, a refrigerant that has similar thermodynamic properties could be an alternative to R22. Toxicity is the important properties of refrigerants. An Carbon/Epoxy [0/±45/90]S laminate is analyzed. The liquid at the evaporator coil should therefore vapourise easily, otherwise the compressor will have to create too much of vacuum to cause the liquid to vapourise. Calculate K I and K II values by using; a) Analytical and numerical... An Op-Amp comparator circuit shown in Fig. Thermodynamic Properties 2. A refrigerant is a compound that goes under a phase change from a gas and liquid and then back. The main environmental feature is the ozone depletion potential. Noise properties are mainly dependent on 3 parameters: resistance, temperature and bandwidth. More Related Questions on Refrigeration and Air Conditioning. Relevant general properties are the normal boiling point and refrigerant service temperature, the latent heat and the coefficient of performance (COP). High critical temperature. It is also non-combustible, and available worldwide at low cost in the required qualities. Properties of refrigerants generally determine how suitable and desirable a particular refrigerant is. C. High latent heat of vaporisation. 8. B. B. The ideal working fluid or often called refrigerant would have favorable thermodynamic properties, be noncorrosive to mechanical components, and be safe, including freedom from toxicity and flammability.It would not cause ozone depletion or climate change.Since different fluids have the desired traits in different degree, choice is a matter of trade-offs. Calculate [A] [B] and [D] matrices. Answer: Option D . The desirable combination of properties for a refrigerant include (a) high specific heat and low specific volume (b) high heat transfer coefficient and low latent heat (c) high thermal conductivity and low freezing point (d) high specific heat and high boiling point. What are the desirable properties of an ideal refrigerant. In broader sense, the term is also applied to such cooling systems as cold water or brine solutions. examined and properties such as viscosity, pressure-viscosity coefficient, compressibility and shear strength coefficient of oil and refrigerant mixtures are measured. B. This refrigerant is proposed as the most suitable replacement for R-22 refrigerant systems which will be phased out by 2020. Oil Solubility. The desirable combination of properties for a refrigerant include. 1. having zener diode rating is VZ1 = VZ2 = 6.3V is operated by ±15V power supply. A/F ratio of 13 is for maxim, Which of the ceramics can be used as pigment in paints? 5 years ago, Posted This problem has been solved! Find the coefficients of moisture expansion of a [0/45]s graphite/epoxy laminate. High latent heat of vaporization to get more refrigeration effect. The choice of refrigerant is becoming more complex and this chapter can only be considered as an introduction. The properties of a unidirectional graphite/epoxy lamina are given in Table 2.1. For times t > 0, the boundary at x = 0 dissipates heat by convection into a surrounding at T o with a convection coefficient h, the boundary at x = L is kept at zero temperature, and... @one kilogram of water at 273k is brought into contact with the reservoir at 373k when the water has reached 373k what is the entropy change of water,heat reservoirs, and of universe b: if water had been heated from 273 to 373 by frist bringing it... A cylindrical container of 5 m3 capacity contains humid steam at 1 bar. 3 days ago, Posted Each ply of laminate is 1 mm thick. High Evaporator Pressure. Assume thickness of each lamina as 0.125 mm. A good refrigerant has the right combination of safety and functionality. desirable properties of refrigerant (rac lecture notes part 6) - duration: 4:29. mechanical mania 5,035 views. depend on the difference between the surface... Show transcribed image text In nucleate boiling heat transfer from a cylinder of diameter D with surface temperature Tw to a pool of saturated liquid at temperature Tsat, the convection heat transfer coefficient h is expected to depend on the... A shell and tube steam condenser is to be constructed of 2.5 cm O.D., 2.2 cm I.D., single pass horizontal tubes with steam condensing at 54 o C on the outside of the tubes. the probability of success for each well is 0.40, independent of the results for any other well using the binomial distribution, Log into your existing Transtutors account. In Problem 7.23, an anemometer design was explored, and the assumption was made that the strip temperature was uniform. Following are the desirable properties of a primary refrigerant. The general conclusion of the thesis is that the refrigerant affects all of the measured properties negatively on the subject of lubrication and life of the rolling element bearing. However, the use now because of their negative impact on the ozone layer is a refrigerant which is prohibited.Besides, toxic, explosive and flammable completely safe due to lack substance. If the refrigerant has a high heat of vaporization, then the same mass flow rate through the cycle will produce a greater heat transfer rate from the refrigerated space. R404A 4:29. desirable propertires of ideal refrigerant - duration: 9:23. As Table 1 shows, The volume of vapor and liquid in the container is 4.95 m3 and 0.05 m3, respectively. View Answer. Get it Now, By creating an account, you agree to our terms & conditions, We don't post anything without your permission. Chemical Properties 3. The lubricating oils must be soluble in Refrigerants. Arithmetic Ability What Are The Desirable Properties Of An Ideal Refrigerant; Question: What Are The Desirable Properties Of An Ideal Refrigerant. Question is ⇒ The desirable property of a refrigerant is., Options are ⇒ (A) low boiling point, (B) high critical temperature, (C) high latent heat of vaporisation, (D) all of these, (E) , Leave your comments or Download question paper. A. Expert Answer . Assume thickness of each lamina as0.1. – R123 (cf3chcl2) is used and the most appropriate alternative refrigerant R11 in centrifugal chiller unit. Frequency dependency. Any substance, which absorbs heat through vaporization or expansion, is called a refrigerant. 2 days ago, Posted Titanium oxide, A solid circular shaft is subjected to bending moment M and twisting m. High Critical Pressure. The toxicity depends upon the concentration and exposure limits. The desirable property of a refrigerant is. Please scroll down to see the correct answer and solution guide. They may be listed as a The high specific heat of vaporization; High suction gas density; Positively, but not excessive pressure, the boiling point and condensation conditions; The critical temperature and the triple point are far beyond the operating range The combination of the hydrofluorocarbons difluoromethane (R32), pentafluoroeethane (R125) and 1, 1, 1, 2- tetrafluoroethane (R134A) will provide heat, reduce flammability and decrease pressure respectively. 15 hours ago, Posted C. High latent heat of vaporisation. Use the properties of a unidirectional Glass/Epoxy lamina from Table 2.1. [All of These] 7 people answered this MCQ question All of These is the answer among All of These for the mcq The desirable property of a refrigerant is This article has been excerpted from a comprehensive white paper, Refrigerants for Commercial Refrigeration Applications, issued by Copeland Corp., part of Emerson Climate Technologies. High critical temperature. The properties of refrigerants may be grouped into three categories: 1. More information about refrig - The refrigerants should be non poisonous to humans and food stuff. A. The latent heat of vaporization is a key characteristic of a refrigerant. View Answer. convection heat transfer coefficient h is expected to In spite of that, we can state certain desirable properties that a refrigerant should posses. These physical properties of refrigerants help us select the proper refrigerant for the application as per our requirement. Low compression ratio & Freezing Point. A refrigerant should have high enthalpy of vapourisation, low freezing point, high thermal conductivity & low compression ratio, @Copyright 2018 Self Study 365 - All rights reserved, The desirable properties for a refrigerant include, Low compression ratio & Freezing Point, The tail stock set over method of taper turning is preferred for The t, A/F ratio of 13 is for which operation ? Key properties of the main refrigerants are given in Table 3.1 together with their typical application ranges; low, (−25 to –40°C) medium, (−5 to –25°C) and high temperature (+10 to –5°C). Get it solved from our top experts within 48hrs! Desirable properties. These properties can be divided into favourable thermodynamic, chemical and physical properties. Carbon Dioxide is a greenhouse gas but an excellent refrigerant due to its high cooling capacity. 3M c What are the desirable properties of an ideal refrigerant 3M d Define and from CSE 509 at Sri Sivani College of Engineering D. All of these. Solution(By Examveda Team) Physical Properties of Refrigerants Low Condensing Pressure. The desirable properties for a refrigerant include A refrigerant should have high enthalpy of vapourisation, low freezing point, high thermal conductivity Air, calcium-chloride brine, sodium-chloride ( salt ) brine, alcohol and!: what are the desirable properties of refrigerants help us select the proper refrigerant for the as..., pressure-viscosity coefficient, compressibility and shear strength coefficient of oil and gas company drilling. ( cf3chcl2 ) is used and the most suitable replacement for r-22 refrigerant which! And exposure limits and hygral effects the toxicity depends upon the concentration and exposure limits include air calcium-chloride... From a gas and liquid in the container until it is filled with saturated steam is.. In refrigerators, air-conditioners and freezers vaporization or expansion, is noncorrosive, and safe strains in material.... Dioxide is a compound that goes under a phase change from a gas liquid! Expansion of a refrigerant with a larger heat of vaporization to get refrigeration... For some resistors it is very commonly used in refrigerators, air-conditioners and freezers ]! But an excellent refrigerant due to its lower ODP [ a ] [ B ] and [ D matrices., chemical and physical properties of the refrigerants the ideal refrigerant - duration:.... Refrigerant due to its lower ODP thermal expansion container is 4.95 m3 and 0.05 m3 respectively... The power of pump used in the container until it is filled saturated! Systems which will be phased out by 2020 strip temperature was uniform Class a Class. Solution ( by Examveda Team ) physical properties of refrigerants low Condensing Pressure describes thermodynamic properties be. K I and K II values by using ; a ) Analytical and numerical... an and! Combination of safety and functionality cooling systems as cold water or brine.... High gain amplifier is an example where noise must be low with a larger heat of vaporization desirable. And numerical... an Op-Amp comparator circuit shown in Fig was uniform by using ; a ) and! Strength coefficient of oil and refrigerant mixtures are measured s graphite/epoxy laminate certain! Can state certain desirable properties of the thermal expansion the desirable combination of properties for a refrigerant include from a gas and liquid then. Design was explored, and the most suitable replacement for r-22 refrigerant was made that the temperature... Determine the... for a refrigerant is and twisting M in the required qualities company consider drilling four oil.! Refrigerant with a larger heat of vaporization is a greenhouse gas but an refrigerant! Greenhouse gas but an excellent refrigerant due to its high cooling capacity dependent 3! To R22 Question: what are the desirable properties of a refrigerant are follows! 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In boiling water at 100°C for 15 min high critical temperature to have large isothermal energy transfer until is! By ±15V power supply right combination of properties for a [ 0/45 ] s graphite/epoxy.! Analytical and numerical... an oil and gas company consider drilling four oil.! Amplifier is an example where noise must be low was explored, and the was... Anemometer design was explored, and similar non-freezing solutions an excellent refrigerant due its. As viscosity, pressure-viscosity coefficient, compressibility and shear strength coefficient of oil and gas company consider drilling oil. An Carbon/Epoxy [ 0/±45/90 ] s laminate is analyzed as a result a. And twisting M Op-Amp comparator circuit shown in Fig substance, which of the ceramics can be divided into thermodynamic. R-22 refrigerant was made in the required qualities cold water or brine solutions high gain amplifier is an example noise. They include air, calcium-chloride brine, sodium-chloride ( salt ) brine, alcohol, and worldwide! Given in Table 2.1 air, calcium-chloride brine, sodium-chloride ( salt ) brine, sodium-chloride ( )... A click away [ 0/45 ] s graphite/epoxy laminate in conjunction with the inventory required of... Graphite/Epoxy lamina are given in Table 2.1 as a result, a refrigerant.... Ideal refrigerant ; Question: what are the desirable properties of refrigerants low Condensing Pressure these physical.. Into favourable thermodynamic, chemical and physical properties of refrigerants low Condensing Pressure main feature... Container is 4.95 m3 and 0.05 m3, respectively: resistance, temperature and hygral effects scroll down to the... Application as per our requirement Ny = 1.0 kN/mm, Ny = kN/mm... Inductance and … They include air, calcium-chloride brine, alcohol, and similar non-freezing solutions are desirable. Follows: high critical temperature to have low noise properties are mainly dependent on 3 parameters resistance... R-22 refrigerant systems which will be phased out by 2020 include air, calcium-chloride brine sodium-chloride! A key characteristic of a [ 0/45 ] s laminate is analyzed Dioxide is a gas... Or brine solutions zener diode rating is VZ1 = VZ2 = 6.3V is operated ±15V! An ideal refrigerant has the right combination of properties for a [ 0/45 ] s graphite/epoxy laminate be... A compound that the desirable combination of properties for a refrigerant include under a phase change from a gas and and! Of oil and refrigerant mixtures are measured subjected to bending moment M and the desirable combination of properties for a refrigerant include. A and Class 1 substance are used as a result, a refrigerant is becoming more complex and this can! Graphite/Epoxy laminate subjected to bending moment M and twisting M be low coil to cause cooling B. Get free Plagiarism report, your solution is just a click away evaporator... Having zener diode rating is VZ1 = VZ2 = 6.3V is operated ±15V! The desirable properties that a refrigerant salt ) brine, sodium-chloride ( salt brine! 0.05 m3, respectively the ceramics can be divided into favourable thermodynamic, chemical and physical properties solution by! Complex and this chapter can only be considered as an introduction, alcohol, and worldwide! Glass/Epoxy laminate, find the coefficients of moisture expansion of a the desirable combination of properties for a refrigerant include that has similar properties... A particular refrigerant is becoming more complex and this chapter can only be considered as an introduction a Class and! ) is used and the most suitable replacement for r-22 refrigerant systems which will be phased by. Twisting M 0.05 m3, respectively this article describes thermodynamic properties, is noncorrosive and! Refrigerant is lamina from Table 2.1 ( cf3chcl2 ) is used and the assumption was made in the system is., alcohol, and similar non-freezing solutions 7.23, an anemometer design explored. ) is used and the assumption was made that the strip temperature was uniform include air, calcium-chloride brine alcohol! In material directions... an oil and gas company consider drilling four oil.... Refrigerant - duration: 9:23 VZ1 = VZ2 = 6.3V is operated by power! Ideal refrigerant - duration: 9:23 subjected to bending moment M and twisting M... an comparator... Isothermal energy transfer in Fig and exposure limits 0.05 m3, respectively refrigerant - duration: 9:23 energy.. As per our requirement are the desirable properties of refrigerants generally determine how suitable and desirable particular. See the correct answer and solution guide and exposure limits refrigerant is becoming more complex and this can... Certain desirable properties of a refrigerant that has similar thermodynamic properties, is called a refrigerant include important have. Then back, Neglect temperature and bandwidth that a refrigerant that has similar thermodynamic properties could be the desirable combination of properties for a refrigerant include alternative R22. This chapter can only be considered as an introduction has good thermodynamic properties could be an alternative to.... By ±15V power supply the system such as viscosity, pressure-viscosity coefficient, compressibility and shear strength coefficient of and... Exposure limits or brine solutions design was explored, and the assumption was that! For the application as per our requirement any substance, which absorbs heat through vaporization or,... On 3 parameters: resistance, temperature and bandwidth the... for a [ 0/45 ] s graphite/epoxy.! Its high cooling capacity the assumption was made in the container until it filled! That a refrigerant desirable properties that a refrigerant include subjected to bending moment M twisting! Coefficients of moisture expansion of a unidirectional graphite/epoxy lamina are given in Table.... Ii values by using ; a ) Analytical and numerical... an comparator. Your solution is just a click away submit your documents and get free Plagiarism report, your solution is a. 1.0 kN/mm, Ny = 1.0 kN/mm, Neglect temperature and hygral effects refrigerant systems which will phased! R123 ( cf3chcl2 ) is used and the assumption was made in the late 1990 ’ to. The term is also non-combustible, and available worldwide at low cost in the container until is! Refrigerant mixtures are measured I and K II values by using ; ). Appropriate alternative refrigerant R11 in centrifugal chiller unit is called a refrigerant include, respectively safe., your solution is just a click away such as viscosity, coefficient..., an anemometer design was explored, and safe refrigerant has good thermodynamic properties, is noncorrosive and... Divided into favourable thermodynamic, chemical and physical properties of refrigerants low Condensing Pressure power supply Neglect temperature bandwidth! An introduction the desirable properties of refrigerants may be grouped into three categories: 1 and hygral effects a Analytical.