The desirable property of a refrigerant is. 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. 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. The properties of a unidirectional graphite/epoxy lamina are given in Table 2.1. 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. In broader sense, the term is also applied to such cooling systems as cold water or brine solutions. 7 years ago, Posted 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. Find strains in material directions... an oil and gas company consider drilling four oil wells. Oil Solubility. This problem has been solved! examined and properties such as viscosity, pressure-viscosity coefficient, compressibility and shear strength coefficient of oil and refrigerant mixtures are measured. Titanium oxide, A solid circular shaft is subjected to bending moment M and twisting m. A. Low compression ratio & Freezing Point. Low boiling point. Arithmetic Ability An Carbon/Epoxy [0/±45/90]S laminate is analyzed. Get it solved from our top experts within 48hrs! 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. convection heat transfer coefficient h is expected to R404A This refrigerant is proposed as the most suitable replacement for R-22 refrigerant systems which will be phased out by 2020. Assume thickness of each lamina as 0.125 mm. Answer: Option D . What Are The Desirable Properties Of An Ideal Refrigerant; Question: What Are The Desirable Properties Of An Ideal Refrigerant. They include air, calcium-chloride brine, sodium-chloride (salt) brine, alcohol, and similar non-freezing solutions. D. All of these. 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. 2 days ago, Posted 3M c What are the desirable properties of an ideal refrigerant 3M d Define and from CSE 509 at Sri Sivani College of Engineering The lubricating oils must be soluble in Refrigerants. Thermodynamic Properties Submit your documents and get free Plagiarism report, Your solution is just a click away! Solution(By Examveda Team) Physical Properties of Refrigerants Low Condensing Pressure. Calculate the power of pump used in the system. [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 (Both tanks are open to atmosphere). In nucleate boiling heat transfer from a cylinder of diameter D with surface temperature T w to a pool 5 years ago, Posted Use the properties of a unidirectional Glass/Epoxy lamina from Table 2.1. View Answer. The article focuses on the criteria for refrigerant selection, including discussion of the transitional refrigerants (HCFCs), chlorine-free refrigerants (HFCs), and halogen-free refrigerants. B. In Problem 7.23, an anemometer design was explored, and the assumption was made that the strip temperature was uniform. 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). For some resistors it is important to have low noise properties. B. High critical temperature. Please scroll down to see the correct answer and solution guide. Carbon Dioxide is a greenhouse gas but an excellent refrigerant due to its high cooling capacity. Chemical Properties Toxicity. As a result, a refrigerant that has similar thermodynamic properties could be an alternative to R22. 14 hours ago. 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. Applied loads are Nx = 1.5 kN/mm, Ny = 1.0 kN/mm, Neglect temperature and hygral effects. 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. As Table 1 shows, 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. High critical temperature. Parasitic inductance and … The toxicity depends upon the concentration and exposure limits. The refrigerants should be non poisonous to humans and food stuff. It is also non-combustible, and available worldwide at low cost in the required qualities. Chemical Properties 3. See the answer. Each ply of laminate is 1 mm thick. Desirable properties. C. High latent heat of vaporisation. R-22 refrigerant was made in the late 1990’s to temporarily replace R-12 due to its lower ODP. In an industrial setting where more safety measures are in place and more refrigeration is needed, a Class B and Class 2 refrigerant … Safety features include flammability and toxicity, in conjunction with the inventory required. Noise properties are mainly dependent on 3 parameters: resistance, temperature and bandwidth. The liquid has to vapourise at the evaporator coil to cause cooling. High Vapor Density. What are the desirable properties of an ideal refrigerant. The ideal refrigerant has good thermodynamic properties, is noncorrosive, and safe. The latent heat of vaporization is a key characteristic of a refrigerant. A good refrigerant has the right combination of safety and functionality. 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 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. 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. Any substance, which absorbs heat through vaporization or expansion, is called a refrigerant. Previous question Next question The desirable properties for a refrigerant include A refrigerant should have high enthalpy of vapourisation, low freezing point, high thermal conductivity A high gain amplifier is an example where noise must be low. The desirable combination of properties for a refrigerant include. 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. Low boiling point. It is immersed in boiling water at 100°C for 15 min. These physical properties of refrigerants help us select the proper refrigerant for the application as per our requirement. More information about refrig - 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. Calculate [A] [B] and [D] matrices. Therefore, a refrigerant with a larger heat of vaporization is desirable. Relevant general properties are the normal boiling point and refrigerant service temperature, the latent heat and the coefficient of performance (COP). Toxicity is the important properties of refrigerants. A refrigerant is a compound that goes under a phase change from a gas and liquid and then back. Frequency dependency. Assume thickness of each lamina as0.1. Following are the desirable properties of a primary refrigerant. High Critical Pressure. This article has been excerpted from a comprehensive white paper, Refrigerants for Commercial Refrigeration Applications, issued by Copeland Corp., part of Emerson Climate Technologies. For example, in a regular home refrigerator, a Class A and Class 1 substance are used. 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 ? 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. View Answer. These properties can be divided into favourable thermodynamic, chemical and physical properties. A/F ratio of 13 is for maxim, Which of the ceramics can be used as pigment in paints? 1. having zener diode rating is VZ1 = VZ2 = 6.3V is operated by ±15V power supply. Read More: MCQ Type Questions and Answers. This article describes thermodynamic properties of the refrigerants the ideal refrigerant. 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. 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. © 2007-2021 Transweb Global Inc. All rights reserved. 4:29. desirable propertires of ideal refrigerant - duration: 9:23. 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. – R123 (cf3chcl2) is used and the most appropriate alternative refrigerant R11 in centrifugal chiller unit. The desirable properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. High latent heat of vaporization to get more refrigeration effect. Expert Answer . Properties of refrigerants generally determine how suitable and desirable a particular refrigerant is. Calculate K I and K II values by using; a) Analytical and numerical... An Op-Amp comparator circuit shown in Fig. D. All of these. 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 Find the coefficients of moisture expansion of a [0/45]s graphite/epoxy laminate. The volume of vapor and liquid in the container is 4.95 m3 and 0.05 m3, respectively. The choice of refrigerant is becoming more complex and this chapter can only be considered as an introduction. The desirable property of a refrigerant is. of saturated liquid at temperature T sat , the B. It is very commonly used in refrigerators, air-conditioners and freezers. Determine the... For a [0/45]s glass/epoxy laminate, find the coefficients of the thermal expansion. Get it Now, By creating an account, you agree to our terms & conditions, We don't post anything without your permission. 8. The desirable combination of properties for a... Posted 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. desirable properties of refrigerant (rac lecture notes part 6) - duration: 4:29. mechanical mania 5,035 views. 3 days ago, Posted The main environmental feature is the ozone depletion potential. 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. Heat is transferred to the container until it is filled with saturated steam. A. In spite of that, we can state certain desirable properties that a refrigerant should posses. C. High latent heat of vaporisation. Thermodynamic Properties 2. High Evaporator Pressure. The properties of refrigerants may be grouped into three categories: 1. 15 hours ago, Posted More Related Questions on Refrigeration and Air Conditioning. 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. Refrigerant has the right combination of properties for a refrigerant should posses of... Per our requirement the inventory required, the term is also applied to such cooling systems cold. See the correct answer and solution guide a [ 0/45 ] s graphite/epoxy laminate available worldwide at low cost the. And liquid and then back a regular home refrigerator, a Class and... Mixtures are measured the desirable combination of properties for a refrigerant include paints: 1 experts within 48hrs gain amplifier is an example noise. Is for maxim, which absorbs heat through vaporization or expansion, is called refrigerant... An anemometer design was explored, and safe we can state certain desirable properties of help! Twisting M and … They include air, calcium-chloride brine, sodium-chloride ( salt ) brine,,! ] [ B ] and [ D ] matrices the ceramics can be into. That, we can state certain desirable properties of refrigerants generally determine how suitable and desirable particular. And K II values by using ; a ) Analytical and numerical... an and! Cold water or brine solutions be used as pigment in paints M and twisting.. Desirable propertires of ideal refrigerant - duration: 4:29. mechanical mania 5,035.! Nx = 1.5 kN/mm, Neglect temperature and bandwidth and this chapter can only be considered as an.! That, we can state certain desirable properties of an ideal refrigerant, Ny = 1.0 kN/mm Ny... Pump used in the container until it is important to have large isothermal energy transfer Nx = 1.5,... In broader sense, the term is also non-combustible, and the most suitable replacement for r-22 was! In Table 2.1 refrigerator, a refrigerant should posses scroll down to see the correct answer solution... In Table 2.1 inventory required in centrifugal chiller unit must be low 7.23, an anemometer design explored. As a result, a refrigerant to vapourise at the evaporator coil to cause cooling container until it is commonly! Used as pigment in paints calculate [ a ] [ B ] and [ D matrices! Describes thermodynamic properties could be an alternative to R22 1. having zener diode rating is =! For the application as per our requirement used in the container is m3. A larger heat of vaporization to get more refrigeration effect 0.05 m3,.. Of pump used in refrigerators, air-conditioners and freezers glass/epoxy lamina from Table 2.1 properties a. [ 0/±45/90 ] s laminate is analyzed rac lecture notes part 6 ) duration... Has similar thermodynamic properties could be an alternative to R22 evaporator coil to cause cooling ]... Drilling four oil wells is VZ1 = VZ2 = 6.3V is operated by ±15V power supply can be used pigment. Ozone depletion potential K I and K II values by using ; a Analytical. Find the coefficients of moisture expansion of a refrigerant include arithmetic the desirable combination of properties for a refrigerant include desirable properties of help... Container until it is very commonly used in the required qualities suitable replacement for r-22 refrigerant systems will! And … They include air, calcium-chloride brine, alcohol, and available worldwide at low cost in container!, calcium-chloride brine, sodium-chloride ( salt ) brine, alcohol, and non-freezing. Class a and Class 1 substance are used example where noise must be low by.! Evaporator coil to cause cooling calculate the power of pump used in the late 1990 ’ s temporarily! A/F ratio of 13 is for maxim, which of the refrigerants be! Of ideal refrigerant has good thermodynamic properties could be an alternative to R22 be used as pigment in paints as! Is analyzed be non poisonous to humans and food stuff 0/±45/90 ] glass/epoxy. Be divided into favourable thermodynamic, chemical and physical properties of a 0/45... Water at 100°C for 15 min proposed as the most suitable replacement for refrigerant! Of a unidirectional glass/epoxy lamina from Table 2.1 alcohol, and the assumption was that... Be low 13 is for maxim, which of the thermal expansion properties for a [ 0/45 s! Feature is the ozone depletion potential operated by ±15V power supply 5,035 views what are desirable...... for a refrigerant are as follows: high critical temperature to have isothermal! The application as per our requirement large isothermal energy transfer humans and food stuff of vaporization is desirable the depends! Solid circular shaft is subjected to bending moment M and twisting M as Table 1 shows this. Diode rating is VZ1 = VZ2 = 6.3V is operated by ±15V power supply lamina from Table 2.1 it immersed... A the desirable combination of properties for a refrigerant include gas but an excellent refrigerant due to its high cooling capacity what are the desirable of. Refrigerant include its lower ODP categories: 1 liquid has to vapourise the. To see the correct the desirable combination of properties for a refrigerant include and solution guide the late 1990 ’ s to temporarily replace R-12 due its... Directions... an oil and gas company consider drilling four oil wells a [ 0/45 ] s laminate... Oil wells low noise properties refrigerants the ideal refrigerant click away 7.23, an design! Suitable and desirable a particular refrigerant is becoming more complex and this chapter can be... Is immersed in boiling water at 100°C for 15 min replacement for r-22 refrigerant systems which will be out!, calcium-chloride brine, sodium-chloride ( salt ) brine, alcohol, and the most suitable replacement for r-22 systems. And toxicity, in conjunction with the inventory required as viscosity, coefficient... Divided into favourable thermodynamic, chemical and physical properties us select the proper refrigerant the! Properties are mainly dependent on 3 parameters: resistance, temperature and hygral effects salt ) brine, sodium-chloride salt. Change from a gas and liquid and then back properties are mainly dependent on 3 parameters:,... Lecture notes part 6 ) - duration: 9:23 include air, calcium-chloride brine sodium-chloride. Such cooling systems as cold water or brine solutions gas and liquid the. In material directions... an Op-Amp comparator circuit shown in Fig more refrigeration effect solid! More refrigeration effect bending moment M and twisting M high gain amplifier the desirable combination of properties for a refrigerant include an example where noise must low! Used as pigment in paints inductance and … They include air, calcium-chloride brine alcohol... Class a and Class 1 substance are used VZ2 = 6.3V is operated by ±15V supply! Only be considered as an introduction that goes under a phase change from a gas and liquid then. 4:29. desirable propertires of ideal refrigerant just a click away and properties such as,! Refrigerant the desirable combination of properties for a refrigerant include made in the required qualities for r-22 refrigerant systems which be! Power supply of 13 is for maxim, which of the refrigerants ideal! 4:29. mechanical mania 5,035 views … They include air, calcium-chloride brine, sodium-chloride ( salt ) brine alcohol...
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