Click here to get an answer to your question ️ What is the disadvantage of ammonia using as a refrigerant? (ii) It is poisonous in high concentration although it is easily detectable due to its peculiar smell and since it is less dense than air it goes up in the atmosphere not affecting the life too much on earth. The brine is used to condense the ammonia c. The brine absorbs heat from the space to be cooled d. Only Freon 22 refrigerants are used e. The condenser pressure must be very high. Ammonia (NH 3) is a well-known refrigerant, particularly applicable in large, industrial plants where its advantages can be fully utilized without compromising safety.. Ammonia is renowned for its favorable thermodynamic properties. Ammonia, a colorless gas with a distinct odor, is a building-block chemical and a key component in the manufacture of many products people use every day.It occurs naturally throughout the environment in the air, soil and water and in plants and animals, including humans. Log in. Ask your question. The freezing point and melting point of liquid ammonia -77.7 and -33.40 are low and the liquid range is very small. Efficiency Ammonia is a highly efficient refrigerant, with a theoretical efficiency slightly higher than that of R134a or propane. Benefits and disadvantages of ammonia The ammonia (NH 3 ) is the most advanced among natural substances, which are used as working media in refrigeration units, and known under designation R717. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. In 1850, it was originally proposed by the American Alexander Twining to use CO2 as a refrigerant in a vapor compression system and it obtained a British patent. Do not mix ammonia with chlorine bleach, as this produces toxic gases called chloramines. Due to ammonia’s hygroscopic nature, it migrates to moist areas of the body, including the eyes, … Finally, compared to CFCs and HCFCs, ammonia requires narrower pipes thus using less space and driving down the valving costs. Please enable Cookies and reload the page. Ask your question. Ammonia has a high efficiency and can easiliy be applied below temperatures of 80 °C. At the same time, there is a huge global population of ammonia systems where those challenges are successfully dealt with. Disadvantages Of Liquid NH3 As a Solvent1. Ammonia has been frequently used as a refrigerant in refrigeration systems. • … As a result, where ammonia refrigeration is appropriate, it can offer lower long-term operation costs. And it’s easily detected by its odor. 2 Ammonia as refrigerant The use of ammonia as refrigerant is increasing due to the restrictions on the use of halogenated hydrocarbons. system using other type of refrigerant for the same temperature level application. Orshoven et al. the following as-sets: 3 ammonia neither harms the atmospheric ozone layer nor contributes to global warming It cannot be cooled below a temperature of zero degrees centigrade b. The disadvantage of water use as refrigerant out weights the advantage, therefore, the R-718 (water) is not considered as a good refrigerant. Weighing the Advantages and Disadvantages of R744 Table 1 outlines the advantages and disadvantages of R744 as a refrigerant. What is the disadvantage of ammonia using as a refrigerant? The refrigerant employed in the compressor, condenser and evaporator systems : In all refrigeration, heat is collected in a suitable fluid and this fluid is removed from the space substance being cooled carrying the heat with it.Such fluid known as refrigerant. they appear greener and healthier when we use … Ammonia’s one disadvantage is its toxicity, but the IIAR reports the refrigerant has a well-established safety record. shown that water and ammonia perform better than the other refrigerants in regards to their potential latent enthalpy. In this respect, the endeavors to reduce the global greenhouse effect can also be best supported with this refrigerant. Ammonia reacts with copper. • The difference in enthalpy of ammonia as a fluid at saturation conditions at 1165.8 kPa abs and 236.2 kPa abs is found in the: ... One of the biggest disadvantages of using an ice box for refrigeration is: a. Many working fluids have been used for such purposes. • Low working pressure. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … Ammonia is considered a high health hazard because it is corrosive to the skin, eyes, and lungs. A number of supermarket installations with CO 2 as the secondary refrigerant have been installed with good results. x A very high enthalpy (heat) of vaporization, making its use possible to produce temperatures as low as - 60°C. Course Hero has all the homework and study help you need to succeed! a. ammonia cannot be detected in case of leakage b. ammonia has a bad effect on ozone layer c. ammonia is toxic in nature d. ammonia has higher energy cost Ammonia has a recognizable odour and so leaks are not likely to escape. There are two key disadvantages to using ammonia as a refrigerant: It is not compatible with copper, so it cannot be used in any system with copper pipes. Q4. Ammonia’s toxicity, flammability and material compatibility have to be taken in to account. Fertilizers are economically very beneficial to farmers. Then using liquid ammonia and freon in succession. iv)Inorganic compounds:-Ammonia, carbon-di-oxide, Sulfur dioxide, Air, etc. Ammonia consists of one nitrogen atom bonded to three hydrogen atoms. The vessels in the machine room have to be sized to carry the system charge throughout the year, so fairly large surge capacities must be included. shown that water and ammonia perform better than the other refrigerants in regards to their potential latent enthalpy. Further use of CO2 occurred in the 1930s when it was used as a cascade refrigerant with ammonia as the high side to obtain low temperatures for freezing foods and to provide refrigeration for cold storages. Fig.1. The primary refrigerant is contained within the primary loop in the machine room and ... it is possible to use alternative fluids, such as ammonia. The secondary refrigerant is circulated through the display cases in the supermarket using a pump. The pungent odor of ammonia makes it easy to detect leaks. In a wide range of applications, it outperforms synthetic refrigerants. Furthermore, it does not cause depletion of the ozone layer. ... are possibilities enabling reduction of greenhouse gas emissions of refrigerants without the disadvantage of … HCFSs are ozone-depleting substances and, under the terms of the Montreal Protocol, the Canadian government has adopted a phase-out schedule. As a refrigerant, ammonia offers some advantages, including particularly: x Good thermodynamic properties (heat/mass transfer) allowing for obtaining machines with one of the best existing performance coefficients. what is net ionic equation for 5 H2O2 _ 2 KMnO4 + 3 H2SO4 --> 5 O2 +2 MnSO4... 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