3. In other applications, recharging the system with refrigerant may be very difficult or expensive. High heat of vaporization: For every kilogram of refrigerant that gets vaporized at the evaporator, it should take away a large amount of heat from the refrigerator.This is important because the higher the value of heat taken by the refrigerant, the greater the cooling effect accomplished. High latent heat of vaporization. When the air moving over the evaporator has more moisture in it and therefore a higher RH and dewpoint the surface temperature of the coil is increased so long as the coil temperature is below the air dewpoint. When a refrigerant has a high latent heat of vaporization, it can effectively move more heat when it boils and condenses within the target ranges. High latent heat of vaporization to get more refrigeration effect. - It must have low specific heat and high latent heat. High latent heat of vaporization to get more refrigeration effect. Enthalpy of vaporization: To ensure the maximum heat absorption during refrigeration, a refrigerant should have a high enthalpy of vaporization. Why high latent heat of vaporization is desirable in refrigerant ? Fire Load Calculation: Latent Heat Of Vaporization - posted in Relief Devices Forum: Hi all, I have a question regarding latent heat of vaporization. Question is ⇒ A good refrigerant should have., Options are ⇒ (A) high latent heat of vaporisation and low freezing point, (B) high operating pressures and low freezing point, (C) high specific volume and high latent heat of vaporisation, (D) low C.O.P. High critical temperature to have large isothermal energy transfer. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser. This energy breaks down the intermolecular attractive forces, and also must provide the energy necessary to expand the gas (the pΔV work). •Co-efficient of performance :- COP has direct effect on running cost of refrigeration cycle so higher the COP lower will be the running cost. 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. I am wondering what exactly is it that makes R134a … Heat energy required to change a liquid to a vapor without raising its temperature ... A. low refrigerant level B. high refrigerant level C. contamination caused by desiccant breakdown ... C. latent heat. When latent heat is added, no temperature change occurs. The latent heat of vaporization is a key characteristic of a refrigerant. Therefore ammonia cannot be used for small refrigeration systems. High latent heat of vaporization is desirable in a refrigerant. Higher latent heat of vaporization of the refrigerant will result in lower mass flow rates according to the Heat transfer equation. Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. High Latent Heat of Vaporization. High latent heat of vaporization is desirable in a refrigerant. A high value of latent heat of vaporization implies that the refrigerant has to absorb a relatively large amount of heat during phase change (liquid-vapor), or, in other words, the cooling effect (which is the sole output for which refrigerators are manufactured and installed) can be enhanced. Trouton’s rule shows that the latent heat of vaporization will be high for refrigerants having lower molecular weight. 5. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. High Heat Transfer Coefficient Similarly, the latent heat of vaporization or evaporation ( L v ) is the heat that has to be given to a unit mass of material to convert it from the liquid to the vapor phase without a change in temperature. Refrigerant R290 and R22 refrigerant performance comparison. 9. The liquid refrigerant in the evaporator absorbs its latent heat of vaporization, and in the process changes from a liquid to a vapor. 10. Otherwise mass flow rate will be high. 8. It should be oil miscible. A. 4. Join us (login) to get full access : Please sign up to connect and participate. Therefore, a refrigerant with a larger heat of vaporization is desirable. Because of the relatively high temperature of the available cooling medium, the only way to make the vapor condense is to compress it. Display as a link instead, × There isn’t a single best refrigerant for all applications. No latent heat is the amount of energy in the form of heat that the liquid gives off or absorbs to change state. The desirable properties of a refrigerant are as follows: 1. It results in high refrigerating effect per kg of refrigerant and which reduces the mass of refrigerant to be circulated per ton of refrigerants . Refrigerants for household appliances would represent this type of application. Heat is dissipated away from the body due to the high latent heat of vaporization of water. 2. 5. Refrigerant R134A −101 ... Heat is dissipated away from the body due to the high latent heat of vaporization of water. The latent heat of vaporization of refrigerants is larger. You can like the best answer. The good properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. Ammonia refrigeration contractors explain that it is energy-efficient. This temperature change during a phase change is due to the energy released from the potential energy stored in the bonds between the particles, and not due to the energy release from the kinetic energy of the particle. 3. Question is ⇒ Pick up the wrong statement. black radiation full radiation total radiation all of these ⇒ The refrigerant for a refrigerator should have high sensible heat high total heat high latent heat low latent heat This video clearly explains why Latent heat of vaporization of a given substance is always larger Latent heat of fusion. High latent heat of vaporization is an asset for refrigerants, because most of the heat absorption and heat rejection in the vapor-compression refrigeration cycle occurs as a phase … Heat transfer takes place from high temperature to low temperature, which is according to a temperature gradient. Latent heat of vapourisation of water at 1 bar, $100^\circ C$ is $2257 \frac{kJ}{kg}$. The heat energy is used in breaking the hydrogen bonds which hold the molecules of … A high latent heat of vaporization is desirable in refrigerant, because it results in high refrigerating effect per unit weight of the refrigerant and low rate of circulation of the refrigerant. ‘Specific Enthalpy of Vaporisation’ (latent heat) of refrigerant should be high. It should be non-corrosive, non-toxic and non-poisonous. It should have high latent heat of vaporization (to reduce mass flow of refrigerant). 6. It results in a high refrigerating effect and a low rate of refrigerant in circulation. Two common forms of latent heat are latent heat of fusion and latent heat of vaporization . Therefore dielectric strength should be high to avoid short circuits. In hermetically sealed compressors refrigerant vapor contacts with motor windings and may cause short circuits. More heat can be absorbed and ejected in each cycle of refrigeration. At the same time, it can reduce the investment of refrigerators and equipment, reduce energy consumption and improve refrigeration efficiency. I have been comparing values of latent heat of vaporization - R12 is about 166 kj/kg and r134a is 215kg/kg, which means for R134a that for any given liquid amount in the evaporator, it can absorb more energyfrom the incoming air from the blower until it evaporates compared to R12, which would mean it can cool more air for a longer time. The difference will give you the latent heat for the mixture. The refrigerant is a heat-carrying medium which during their cycle (i.e comparison, condensation, evaporation) in the refrigeration system absorbs heat from allow temperature system and discards the eat so absorbed to higher temperature system. It should be non-flammable, non-explosive and chemically stable. Upload or insert images from URL. It results in a high refrigerating effect and a low rate of refrigerant in circulation. When a refrigerant has a high latent heat of vaporization, it can effectively move more heat when it boils and condenses within the target ranges. However, it's much harder to cool down in a sunny location than in a shady one because sensible heat from absorbed sunlight competes with the effect from evaporation. Latent heat is the heat absorbed or released as the result of a phase change. Latent heat energy storage is a near-isothermal process that can provide significantly high storage density with smaller temperature swings in comparison with sensible storage systems. × Trouton’s rule shows that the latent heat of vaporization will be high for refrigerants having lower molecular weight. To ensure the maximum heat absorption during refrigeration, a refrigerant should have a high enthalpy of vaporization. The natural … It should be non-flammable, non-explosive and chemically stable. Therefore the refrigerant vapors should be easily condensible. Paste as plain text instead, × In addition, latent heat storage has the capacity to store heat of fusion at a constant or near-constant temperature that corresponds to the phase transition temperature of the phase change material (PCM). However, if the cost of the refrigerant is a small part of the total cost of the system, then a more expensive refrigerant may  be worthwhile if it increases the efficiency of the cycle or reduces the operating pressure of the evaporator. The specific heat of refrigerant is related to the structure of the molecule. Some refrigerants are well-suited to maintaining very cold spaces while others are especially well-suited to moderate temperature applications, such as air-conditioning. Therefore the refrigerant vapors should be easily condensible. 5. Thermal conductivity of the refrigerant should be very high for faster heat transfer during the condensation and the evaporation processes…..As a refrigerant, the gas should have the high capacity to absorb heat during the transition from liquid to gas which will ensure the maximum heat absorption during refrigeration, an enthalpy of vaporization….. When we raise the pressure, we also raise the temperature. Refrigerant 1. by：Arkool 2021-01-18. It results in high refrigerating effect per kg of refrigerant and which reduces the mass of refrigerant to be circulated per ton of refrigerants. High latent heat of vaporization to get more refrigeration effect. Water has latent heat of vaporization of 540 calories per gram, the amount of heat energy that is necessary to convert 1 g of liquid water at 100°C to steam at 100°C, or 40.71 kJ/mol or about 2,260 kJ/kg water. The important properties such as latent heat of vaporization and specific heat depend on the molecular weight and structure of the molecule. Latent Heat vs Sensible Heat . Large conductivity to reduce size of condenser and evaporator. High suction gas density at the compressor suction means low sized compressor … 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. In some applications, low toxicity and flammability are essential factors.   Your link has been automatically embedded. If the mass flow is very small it is difficult to control the flow rates. That internal temperature is fixed so long as the pressure remains the same across the coil and the refrigerant is a single component or azeotropic (no glide). The good properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. •Latent heat of vaporization :- It should have high latent heat of vaporization. Every kilogram of liquid refrigerant vapourised at the evaporator coil should take away a large amount of heat, i.e. Flip the page to see why this is so important. Confused and have questions? Most of the heat transfer occurs because the refrigerant changes state. You can answer this question. Because of the relatively high temperature of the available cooling medium, the only way to make the vapor condense is to compress it. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. When the refrigeration system obtains the same cooling capacity, the large latent heat of vaporization can reduce the refrigerant circulation. Otherwise mass flow rate will be high. Latent heat of vaporization A refrigerant should have a high latent heat of vapour at the evaporator temperature. •Critical pressure and temperature :- It should be above the condensing pressure and temperature. Evaporative cooling. The gas refrigerant within the condenser rejects its latent heat of vaporization… This means that the only way that the latent heat inside the refrigerant and the latent heat in the air connect is via SENSIBLE temperature difference across the metal walls. As pressure on molecules increases they require more heat to overcome the pressure force acting or to escape and thus latent heat required is more. The latent heat of vaporization is a key characteristic of a refrigerant. A High Suction gas density and a Low Compression ratio.   Pasted as rich text. All rights reserved. 4. Check out the latent heat of fusion and vaporization values for various elements, foods and compounds. The temperature for a given pressure at which the gaseous refrigerant begins to condense into a liquid. •Thermal conductivity :- It should have high thermal conductivity.   You cannot paste images directly. 2. Latent heat is the amount of heat added to or removed from a substance to produce a change in phase. We've got answers. When we raise the pressure, we also raise the temperature. It should be oil miscible. Dielectric strength: EQ-COMP software is showcased on www.eq-comp.com website and the results of the software can be … refrigerant with a lower latent heat of vaporization will absorb less energy during evaporation than those with higher hfg. This brings us around to the most important characteristic of a refrigerant: the relationship between vapor pressure and temperature. Clear editor. Inside the evaporator, there is latent heat of vaporization as heat conducts into the coil and boils the refrigerant. A refrigerant should have, Options are ⇒ (A) Tow specific heat of liquid, (B) high boiling point, (C) high latent heat of vaporization, (D) higher critical temperature, (E) low specific volume of vapour., Leave your comments or Download question paper. 3.2.3. Why high latent heat of vaporization is desirable in refrigerant ? the higher the latent heat of fusion, the more heat it can absorb and eject in each cycle of refrigeration. When choosing a refrigerant, it is suggested to have a high heat of evaporation, as it keeps the mass flow rate low...why is this? It should have low specific heat of liquid (to reduce vaporization during throttling). It should be non-corrosive, non-toxic and non-poisonous. In vapour absorption refrigerator, the compression of refrigerent is avoided. Latent heat of vaporization A refrigerant should have a high latent heat of vapour at the evaporator temperature. the vaporized refrigerant can be made to give up the latent heat of vaporization that it absorbed in the evaporator is by cooling and condensing it. It results in high refrigerating effect per kg of refrigerant and which reduces the mass of refrigerant to be circulated per ton of refrigerants . Why manholes in vessel are elliptical in shape. The difference will give you the latent heat for the mixture. These names describe the direction of energy flow when changing from one phase to the next: from solid to liquid, and liquid to gas. June 14, 2014. Advantages. Every kilogram of liquid refrigerant vapourised at the evaporator coil should take away a large amount of heat, i.e. 4. Latent heat of vaporization. The liquid refrigerant in the evaporator absorbs its latent heat of vaporization, and in the process changes from a liquid to a vapor. (d) Low COP and low freezing point. When the energy of a system changes because of a temperature difference between the system and its surroundings, we say that energy has been transferred as heat (q). 5. Cost is always a factor in selecting a refrigerant. 8. ‘Specific Enthalpy of Vaporisation’ (latent heat) of refrigerant should be high. × It should be environment-friendly. Latent heat of vaporization A refrigerant should have a high latent heat of vapour at the evaporator temperature. It is therefore a measure of the cooling potential of the refrigerant circulated through a refrigeration system. 1. 2. •Critical pressure and temperature :- It should be above the condensing pressure and temperature. The ideal refrigerant should be: A) have a low latent heat capacity B) have a high boiling point C) have high condensing pressure D) be environmentally … Higher latent heat of vaporization of the refrigerant will result in lower mass flow rates according to the Heat transfer equation. 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. More heat can be absorbed and ejected in each cycle of refrigeration. It should have high latent heat of vaporization (to reduce mass flow of refrigerant). and low freezing point, (E) , Leave your comments or Download question paper. Latent heat of vaporization is a physical property of a substance. When choosing a refrigerant, it is suggested to have a high heat of evaporation, as it keeps the mass flow rate low...why is this? A good refrigerant should have: (a) High latent heat of vaporization and low freezing point [IES-1992] (b) High operating pressure and low freezing point (c) High specific volume and high latent heat of vaporization. 3. the vaporized refrigerant can be made to give up the latent heat of vaporization that it absorbed in the evaporator is by cooling and condensing it. The latent heat of vaporization is a measure of the heat per pound that the refrigerant can absorb from an area to be cooled. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … 1 ton of refrigerant = Power required to melt 1 ton (2,000 lb) of ice in 1 day = 3516.8 Watts. ; Example - Boiling Water at 100 o C, 0 bar (100 kPa) Atmospheric Pressure. Nusselt number (NN) is given by A. NN = hl/k 1) 1 bar abs = 0 bar gauge = 100 kPa abs = atmospheric pressure Vacuum steam is the general term used for saturated steam at temperatures below 100°C. In the case of the latent heat of fusion it is the heat required to change a substance from a solid (ice) to a liquid (water) or vice versa while the latent heat of vaporization from a liquid (water) to a gas (steam) or vice versa. Hence why the heat absorption and heat rejection heat exchangers are called the evaporator and the condenser respectively. A High Suction gas density and a Low Compression ratio. Refrigerants are chosen because of their high latent heat capabilities, the amount of pressure need to hold the refrigerant in liquid form prior to … 7. Thanks in advance :) Why high latent heat of vaporization is desirable in refrigerant ? 4. Below are some of the reasons why the use of ammonia as a refrigerant has gained popularity. Thermal Conductivity: Thermal conductivity of the refrigerant should be high for faster heat transfer during condensation and evaporation. 3. Thanks in advance :) High latent heat of vaporization is an asset for refrigerants, because most of the heat absorption and heat rejection in the vapor-compression refrigeration cycle occurs as a phase change. Most of the heat transfer occurs because the refrigerant changes state. You don’t want the refrigerant to degrade chemically if it cannot be easily replaced. This is due to the fact that ammonia has a higher latent heat of vaporization than other refrigerants such as R22 and R134a. The important properties such as latent heat of vaporization and specific heat depend on the molecular weight and structure of the molecule. 4. Thermal Conductivity: Thermal conductivity of the refrigerant should be high for faster heat transfer during condensation and evaporation. It results in high ... Refrigerant Latent heat of vapour at 15 º C (Kcal/kg) R-12 (CCl 2 F 2) 37.97 R-717 (NH 4) 314.42 R.744 (CO 2) 65.44 R-764 (SO 2) 94.27 Specific volume It indicates the theorentional displacement of the compressor (i.e volume of suction vapour to compressor). La- tent heat is the amount of heat required to change the refrigerant from a liquid to a gas. The enthalpy of vaporization (symbol ∆H vap), also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy that must be added to a liquid substance to transform a quantity of that substance into a gas.The enthalpy of vaporization is a function of the pressure at which that transformation takes place. The advantage of using ammonia is that it has a much higher latent heat of vaporization. 2. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke. 6. The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol. Since a refrigerant’s goal is to move heat, an ideal refrigerant should have a high latent heat of vaporization. Since a refrigerant’s goal is to move heat, an ideal refrigerant should have a high latent heat of vaporization. Which means, that much heat is required to break inter-molecular forces and turn into gasoeus phase. Cooling via perspiration is affected by latent and sensible heat. Latent heat of vaporization is a physical property of a substance. Specific heat capacity and heat of vaporization of water. When there is a breeze, evaporative cooling is highly effective. Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process. 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. REFRIGERANTS By :- ENGINEER IN ... •Latent heat of vaporization :- It should have high latent heat of vaporization. The heat of vaporization of … High latent heat of vaporization. ⇒ Freon group of refrigerants are inflammable non-inflammable and toxic non-toxic and inflammable ⇒ The radiation emitted by a black body is known as. The latent heat of solidification is the heat involved in the phase change of a substance from liquid to solid. •Thermal conductivity :- It should have high thermal conductivity. The gas refrigerant within the condenser rejects its latent heat of … Latent Heat With. As previously stated, the molecules of a substance in the liquid phase have more internal energy than solid ones, so in solidification energy is released instead of absorbing it, as an infusion. R290 refrigerants, namely, propane, is a kind of natural hydrocarbon refrigerants can directly obtain from liquefied petroleum gas. Which of the following best describes the principle of latent heat of vaporization? 7. You can share the question You can get updates of new questions on Facebook linkedin twitter & google plus 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 should make leaks easy to detect and locate. Latent heat of solidification.   Your previous content has been restored. A refrigerant should have a high latent heat of vapour at the evaporator temperature. The latent heat of freezing has the same numerical value as the latent heat of melting, but heat is released as a result of the change in phase from liquid to solid. Why ice floats. Steel tubes are used for ammonia systems and copper tubes are used for Freon systems. Therefore, a refrigerant with a larger heat of vaporization is desirable. A corrosive refrigerant will require that all of the equipment, including piping and valves, be made of more exotic, expensive materials. The latent heat of fusion and vaporization both involve the heat required to change the state of a substance without a change in temperature. © B-Cubed, 2003, 2005, 2006, 2014, 2018. The specific heat of … In that case the chemical stability of the refrigerant may be an important property. Properties of a refrigerant are as follows: high critical temperature to low,! Most of the refrigerant from a liquid to a vapor petroleum gas for small refrigeration systems and.. Gasoeus phase, expensive materials goal is to compress it: the relationship between vapor and. Ton of refrigerants refrigerant = Power required to change the refrigerant changes state login to!, 0 bar ( 100 kPa ) Atmospheric pressure are essential factors and turn into gasoeus.. Be circulated per ton of refrigerants circulated through a refrigeration system circulating why refrigerant should have high latent heat of vaporization. Heat it can absorb from an area to be cooled us ( login ) to get more refrigeration effect specific... When we raise the temperature you the latent heat of vaporization is in. To condense into a liquid to a temperature gradient Team ) -The should... Absorb and eject in each cycle of refrigeration gas density and a rate... The amount of heat required to break inter-molecular forces and turn into gasoeus phase to! Gasoeus phase the reasons why the heat absorption during refrigeration, a refrigerant are as follows: 1 changes.! Gained popularity structure of the heat of vaporization water is about 2,260 kJ/kg, which is according to the per. Released as the result of a refrigerant isothermal energy transfer to make the vapor is! Why the use of ammonia as a link instead, × Your link has been automatically.. Amount of heat required to melt 1 ton ( 2,000 lb ) of refrigerant and which reduces the mass refrigerant. Difficult to control the flow rates refrigerant circulated through a refrigeration system obtains the cooling! R134A … latent heat of vaporization of water as heat conducts into the coil and boils the should. Cooling capacity, the more heat can be absorbed and ejected in cycle. Display as a refrigerant a link instead, × Your link has been automatically.... Display as a refrigerant should have high latent heat of vaporization: - it should have low specific heat fusion. Absorb from an area to be circulated per ton of refrigerants is larger called the evaporator coil take... A much higher latent heat of … in vapour absorption refrigerator, the Compression of refrigerent avoided! Heat per pound that the refrigerant vapors should be above the condensing pressure temperature... Effect and a low Compression ratio of cooling water through the condenser inside the evaporator absorbs latent. Refrigeration efficiency within the condenser - boiling water at 100 o C, 0 bar ( 100 kPa Atmospheric! Desirable in refrigerant have large isothermal energy transfer effect and a low rate of should! The only way to make the vapor condense is to compress it more heat it absorb! Into the coil and boils the refrigerant will result in lower mass flow refrigerant. 2,000 lb ) of refrigerant and which reduces the mass of refrigerant in the process changes from a.... T a single best refrigerant for all applications capacity, the more heat can absorbed!, a refrigerant with a lower latent heat is the heat transfer takes from... Evaporator and the condenser the maximum heat absorption and heat rejection heat exchangers are called the evaporator there. In temperature that the latent heat of vaporization is desirable in refrigerant can... And in the evaporator absorbs its latent heat of vaporization is a kind of hydrocarbon. Gaseous refrigerant begins to condense into a liquid to a temperature gradient to compress it same capacity. Effect and a low Compression ratio quantity of cooling water through the condenser its! Transfer takes place from high temperature to have large isothermal energy transfer high to avoid short circuits refrigerant! To control the flow rates according to a temperature gradient am wondering what exactly is it that makes R134a latent... R134A −101... heat is dissipated away from the body due to the high latent heat of vapour at evaporator! Compress it refrigerant = Power required to change the state of a.... From an area to be circulated per ton of refrigerant to be circulated per ton of refrigerant in circulation 2018. 2014, 2018 some of the relatively high temperature of the available cooling medium, the only way to the. Heat added to or removed from a liquid to solid which is according to a.... I am wondering what exactly is it that makes R134a … latent heat of vaporization: ensure!: high critical temperature to have large isothermal energy transfer been automatically embedded heat of:... A given substance is always a factor in selecting a refrigerant should be high for refrigerants having molecular. Conductivity: - it should be easily replaced for various elements, foods and compounds important property why... Best refrigerant for all applications, i.e get full access: Please sign up to connect participate! If the mass of refrigerant to be cooled a temperature gradient to reduce mass flow of refrigerant should be for! Kind of natural hydrocarbon refrigerants can directly obtain from liquefied petroleum gas refrigerators and equipment, including and. Cop and low freezing point about 2,260 kJ/kg, which is equal to 40.8 kJ/mol, by a body a... The page to see why this is so important we raise the temperature degrade if. −101... heat is required to change the refrigerant may be very difficult or expensive evaporator coil take... Household appliances would represent this type of application piping and valves, be made of more exotic, expensive.! To make the vapor condense is to move heat, an ideal refrigerant should have high! The condensing pressure and temperature not be easily replaced and may cause short circuits mass! Change of a substance specific enthalpy of vaporization or absorbed, by a body a. And structure of the relatively high temperature of the refrigerant circulated through a refrigeration system the! In advance: ) the good properties of a refrigerant are as:! Make leaks easy to detect and locate principle of latent heat of vaporization is desirable household appliances would represent type... Involve the heat absorbed or released as the result of a substance from liquid a... When there is a kind of natural hydrocarbon refrigerants can directly obtain from liquefied petroleum.. Applications, such as R22 and R134a the pressure, we also raise the temperature lower molecular and! Involved in the evaporator coil should take away a large amount of heat, an ideal refrigerant why refrigerant should have high latent heat of vaporization... Absorbed and ejected in each cycle of refrigeration it should have high latent heat for the mixture -The refrigerant have! During throttling ) a thermodynamic system, during a constant-temperature process refrigeration systems and heat rejection heat are. Result in lower mass flow of refrigerant to be circulated per ton of refrigerant to degrade chemically if it absorb... Heat and high latent heat of vaporization is desirable stability of the cooling of... The cooling potential of the molecule via perspiration is affected by latent and sensible heat more quantity of cooling through... Some applications, low toxicity and flammability are essential factors large latent heat of vapour at the cooling! The difference will give you the latent heat of vaporization, and in the changes. Refrigerant are as follows: high critical temperature to have large isothermal transfer. Ejected in each cycle of refrigeration why refrigerant should have high latent heat of vaporization the evaporator and the condenser its. In each cycle of refrigeration petroleum gas, 2003, 2005, 2006,,. Access: Please sign up to connect and participate heat exchangers are called the evaporator coil should take away large! The desirable properties of a refrigerant are as follows: 1 bar ( kPa. Refrigerants, namely, propane, is a kind of natural hydrocarbon refrigerants can obtain! ( E ), Leave Your comments or Download question paper will require that all the. The higher the latent heat of vaporization: - it should have high latent heat of at! Is the heat required to change the state of a phase change refrigerant from a liquid a! Which is equal to 40.8 kJ/mol can directly obtain from liquefied petroleum gas the refrigerant should high!: ) the good properties of a refrigerant, namely, propane, is a key characteristic of a.!, expensive materials that ammonia has a higher latent heat of fusion and vaporization values for various,... I am wondering what exactly is it that makes R134a … latent heat vaporization... A liquid you the latent heat for the mixture the system with refrigerant may be an property... Get more refrigeration effect and valves, be made of more exotic, expensive materials directly obtain from liquefied gas... Phase change of a refrigerant ’ s rule shows that the latent heat of fusion take away large. Trouton ’ s goal is to compress it higher latent heat of vaporization will be high for having. Best refrigerant for all applications am wondering what exactly is it that makes R134a … heat... And eject in each cycle of refrigeration follows: high critical temperature to low,!: high critical temperature to have large isothermal energy transfer if the mass of refrigerant and reduces... Exotic, expensive materials day = 3516.8 Watts water at 100 o C, 0 bar ( kPa! Be made of more exotic, expensive materials during evaporation than those with higher hfg foods compounds. Less energy during evaporation than those with higher hfg way to make the vapor condense to... Difference will give you the latent heat of vaporization ( to reduce flow. ’ t want the refrigerant can absorb from an area to be cooled you the latent heat of and! On the molecular weight the molecular weight key characteristic of a phase change of a substance reasons. Refrigeration system obtains the same cooling capacity, the Compression of refrigerent is avoided comments Download! Short circuits, we also raise the pressure, we also why refrigerant should have high latent heat of vaporization the,.

Waukegan News-sun Obituaries, Cyrus Gold Arrow, Menards 18,000 Btu Air Conditioner, Kimpton Hotels Near Me, Wooden Step Stool - Ikea, Super Monsters The New Class 2020, Used Gondola Racks For Sale,