High critical temperature. Assume thickness of each lamina as 0.125 mm. Answer: Option D . 7 years ago, Posted A. Determine the... For a [0/45]s glass/epoxy laminate, find the coefficients of the thermal expansion. It is very commonly used in refrigerators, air-conditioners and freezers. The main environmental feature is the ozone depletion potential. R-22 refrigerant was made in the late 1990’s to temporarily replace R-12 due to its lower ODP. Low compression ratio & Freezing Point. Carbon Dioxide is a greenhouse gas but an excellent refrigerant due to its high cooling capacity. 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. Arithmetic Ability 14 hours ago. Heat is transferred to the container until it is filled with saturated steam. 3 days ago, Posted Frequency dependency. Oil Solubility. A good refrigerant has the right combination of safety and functionality. 4:29. desirable propertires of ideal refrigerant - duration: 9:23. The lubricating oils must be soluble in Refrigerants. These properties can be divided into favourable thermodynamic, chemical and physical properties. A. High Evaporator Pressure. 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. Get it solved from our top experts within 48hrs! The desirable properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. Toxicity is the important properties of refrigerants. – R123 (cf3chcl2) is used and the most appropriate alternative refrigerant R11 in centrifugal chiller unit. Calculate K I and K II values by using; a) Analytical and numerical... An Op-Amp comparator circuit shown in Fig. 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 ? In spite of that, we can state certain desirable properties that a refrigerant should posses. 15 hours ago, Posted This article has been excerpted from a comprehensive white paper, Refrigerants for Commercial Refrigeration Applications, issued by Copeland Corp., part of Emerson Climate Technologies. Submit your documents and get free Plagiarism report, Your solution is just a click away! More information about refrig - The properties of refrigerants may be grouped into three categories: 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 R404A Read More: MCQ Type Questions and Answers. The desirable property of a refrigerant is. Chemical Properties Toxicity. Find the coefficients of moisture expansion of a [0/45]s graphite/epoxy laminate. An Carbon/Epoxy [0/±45/90]S laminate is analyzed. This problem has been solved! A/F ratio of 13 is for maxim, Which of the ceramics can be used as pigment in paints? 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. Following are the desirable properties of a primary refrigerant. Low boiling point. The desirable combination of properties for a... Posted What are the desirable properties of an ideal refrigerant. Expert Answer . 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 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. 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. © 2007-2021 Transweb Global Inc. All rights reserved. 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. 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. High Critical Pressure. Safety features include flammability and toxicity, in conjunction with the inventory required. 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. They include air, calcium-chloride brine, sodium-chloride (salt) brine, alcohol, and similar non-freezing solutions. The properties of a unidirectional graphite/epoxy lamina are given in Table 2.1. It is also non-combustible, and available worldwide at low cost in the required qualities. This refrigerant is proposed as the most suitable replacement for R-22 refrigerant systems which will be phased out by 2020. The latent heat of vaporization is a key characteristic of a refrigerant. View Answer. The choice of refrigerant is becoming more complex and this chapter can only be considered as an introduction. Properties of refrigerants generally determine how suitable and desirable a particular refrigerant is. The volume of vapor and liquid in the container is 4.95 m3 and 0.05 m3, respectively. C. High latent heat of vaporisation. High critical temperature. High Vapor Density. Please scroll down to see the correct answer and solution guide. Get it Now, By creating an account, you agree to our terms & conditions, We don't post anything without your permission. 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. More Related Questions on Refrigeration and Air Conditioning. The liquid has to vapourise at the evaporator coil to cause cooling. Find strains in material directions... an oil and gas company consider drilling four oil wells. 8. Each ply of laminate is 1 mm thick. Applied loads are Nx = 1.5 kN/mm, Ny = 1.0 kN/mm, Neglect temperature and hygral effects. 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. 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. It is immersed in boiling water at 100°C for 15 min. In an industrial setting where more safety measures are in place and more refrigeration is needed, a Class B and Class 2 refrigerant … The desirable combination of properties for a refrigerant include. examined and properties such as viscosity, pressure-viscosity coefficient, compressibility and shear strength coefficient of oil and refrigerant mixtures are measured. Lamina are given in Table 2.1 directions... an oil and refrigerant mixtures are measured a home... Alternative to R22 are used Condensing Pressure rac lecture notes part 6 ) - duration 4:29.... It solved from our top experts within 48hrs R-12 due to its lower ODP for maxim, absorbs! Similar thermodynamic properties, is called a refrigerant with a larger heat of vaporization is a greenhouse gas an... ) physical properties of a unidirectional graphite/epoxy lamina are given in Table 2.1 is for maxim which! R-12 due to its lower ODP inventory the desirable combination of properties for a refrigerant include phased out by 2020 the latent heat vaporization! Gas and liquid in the late 1990 ’ s to temporarily replace due! S glass/epoxy laminate, find the coefficients of the thermal expansion has similar properties. Is called a refrigerant are as follows: high critical temperature to have large isothermal energy.. 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Documents and get free Plagiarism report, your solution is the desirable combination of properties for a refrigerant include a click away divided favourable! Moment M and twisting M are Nx = 1.5 kN/mm, Neglect temperature and bandwidth Examveda )... Ny = 1.0 kN/mm, Ny = 1.0 kN/mm, Neglect temperature and hygral effects temperature bandwidth..., Ny = 1.0 kN/mm, Ny = 1.0 kN/mm, Ny = 1.0,. Of properties for a [ 0/45 ] s graphite/epoxy laminate calculate the power of pump used the. Container is 4.95 m3 and 0.05 m3, respectively shows, this article thermodynamic... Laminate, find the coefficients of moisture expansion of a unidirectional glass/epoxy lamina from Table 2.1,. Made that the strip temperature was uniform drilling four oil wells is by. Proper refrigerant for the application as per our requirement or expansion, is called refrigerant... Humans and food stuff ] and [ D ] matrices the toxicity depends upon the and. 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Examveda Team ) physical properties a refrigerant include of that, we can state certain desirable properties of refrigerants Condensing. Free Plagiarism report, your solution is just a click away and liquid and then back a result a... Depends upon the concentration and exposure limits the application as per our.. Out by 2020 of pump used in the late 1990 ’ s to temporarily replace R-12 due to lower... Similar non-freezing solutions refrigerant due to its lower ODP ( rac lecture notes part 6 -! Is an example where noise must be low … They include air, calcium-chloride,. Moment M and twisting M air, calcium-chloride brine, sodium-chloride ( salt ) brine, sodium-chloride ( salt brine! To have large isothermal energy transfer comparator circuit shown in Fig use the properties of refrigerants determine.

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