Right hydrocarbon refrigerants absorb a minimum of moisture. What does the presence of bubbles indicate? The physical impacts to the internal operation of the system include: • Increasing levels of moisture become insoluble with the refrigerant at certain temperatures and pressures, resulting in the formation of ice, typically within the expansion device. Compressor. Highest COPs of 3.12, 3.07 and 2.96 were obtained with 120 g charge for R152a, R134a and R32, … (e) heat transfer. C. Evaporator. Fig. A chemical dot placed under the glass lens of a sight glass, which is exposed to liquid, serves what function? Humidity depends on water vaporization and condensation, which, in turn, mainly depends on temperature. Thanks for giving this info!” Reply. a) 20% b) 15% c) 10%. This may require filter changes daily/weekly/monthly until the moisture levels are below the point at which oil breakdown can occur e.g. Answer & Solution Discuss in Board Save for Later. again affect the thermophysical properties of the refrigerant. Free. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and. Correct Answer : B. moisture presented in the liquid refrigerants so that Abstract-The performance of heat transfer is one of the most important research areas in the field of thermal engineering. 64. Mcq Added by: Muhammad Bilal Khattak. 3. A (C.O.P.) IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Carbon dioxide. P = (C.O.P.) The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and (A) Carbon dioxide (B) Sulphur dioxide (C) Lithium bromide (D) R-12. etc. B. Condenser. Learn how each type works, what defines them, their pros and cons, and draw a comparison between them here to be able to make an informed decision you won’t later regret. Presence of moisture in a refrigerant affects the working of_____? How should gauge set hoses be sized for use in evacuating a system? Meaning of Refrigerant: A refrigerant is a working substance which is used in refrigerating machine. Often DOUBLE but in NO case LESS THAN 1.2 times operating pressure. Ans: d; Refrigeration in aeroplanes usually employs the following refrigerant (a) Co2 (b) Freon-11 (c) Freon-22 (d) Air (e) none of the above. A. compressor B. condenser C. evaparator D. expansion valve E. heat transfer. Moisture present in the refrigerant reacts chemically with the P 2 O 5 and appears as an increase in mass in the first tube. Term. The official moisture meter for testing soybeans is the GAC 2100 as of August 1, 1998 (DICKEY-john Corp, Auburn, IL). (e) heat transfer. Generally, the first property considered is miscibility (lubricant with liquid refrigerant). R + 2 . D. R-12. Desiccant or refrigerant? Moisture is the presence of a liquid, especially water, often in trace amounts.Small amounts of water may be found, for example, in the air (), in foods, and in some commercial products.Moisture also refers to the amount of water vapor present in the air.. Moisture control in products. It will also be responsible for some serious long-term damage to the system in many different ways. D (C.O.P) P = (C.O.P) R. View Answer Discuss. Presence of air drastically reduces the capacity of the refrigeration system. – Adsorption of substances into plastics and elastomers, thereby changing their physical properties and reducing their ability to seal properly. Abstract - The working agent in a refrigerating system that absorbs carries or releases heat from the place to be cooled or refrigerated can be termed as a refrigerant. – Reduction in lubricating properties leading to erosion and s Generally refrigerants are classified into various types on the basis of their physical and chemical changes during the course of operation. Refrigeration in aeroplanes usually employs the following refrigerant (a) Co2 (b) Freon-11 (c) Freon-22 (d) Air (e) none of the above. The moisture content and the permeability predominantly influence the impact of pollutants on the rate of weathering of the material. (e) heat transfer. A) Technician A only B) Technician B only C) Both A and B D) Neither A nor B . – Increasing levels of moisture become insoluble with the refrigerant at certain temperatures and pressures, resulting in the formation of ice, typically within the expansion device. D. Expansion valve. ... must be graduated to a point higher than operating press.This is often _____ but in no case less than _____ times the working press. Refrigeration in aeroplanes usually employs the following refrigerant (a) Co2 (b) Freon-11 (c) Freon-22 (d) Air (e) none of the above. R + 1 . Refrigeration and Air Conditioning Refrigeration and Air Conditioning. B. Sulphur dioxide. A. Consequently, any humidity in systems using diese refrigerants die in the form of free water, making her presence known through freeze-ups. Term. This heat transfer generally takes place through a phase change of the refrigerant. Question No : 56 Presence of moisture in a refrigerant affects the working of . are just as the name states, loosely filled with molecular sieve material which is held in the Flash-gas may be detected in the system by the observation of bubbles or gas presence in the ... Increasing the pipeline diameter may have incidence on the oil circulation and affect the gas compressor. The refrigerant that has moisture in it will not just affect the efficiency of the refrigeration system. It is a working fluid through which heat is transferred from the cold body to the hot body. Compression Ratio The compression ratio needs to be as small as possible otherwise the leakage of refrigerant occurs across the piston. of a refrigerator working as a heat pump is given by . The coefficient of performance (C.O.P.) Presence of moisture in a refrigerant affects the working of (a) compressor (b) condenser (c) evaparator (d) expansion valve. Moisture content determines how much dry matter is bought or sold. These properties are pressure, temperature, volume, density, enthalpy, flammability, ability to mix with oil, moisture reaction, odor, toxicity, leakage tendency, and leakage detection. Ans: d 30. As the name implies, water vapor is water in vapor form. rohitpatel Feb 4, 2020 At 11:06 am “Hi, A lot of information about Refrigerants and refrigerants work in all details Your site provides very useful information. In terms of comfort and health, the ideal relative humidity is 40 to 50 percent. 7 shows the effect of refrigerant charges on the system COP.The COP increases with refrigerant charge for all the refrigerants. A Compressor . Technician A says "intent to vent" means the technician is working in a shop without adequate ventilation.Technician B says "intent to vent" means the technician is working on an air conditioner in a shop that does not have a recovery machine for each type of refrigerant being serviced.Who is correct? refrigerant sample analysis of moisture presence. The second tube is used as a tare. Find an answer to your question Presence of moisture in a refrigerant affects the working of which component With PAG lubricants, higher functionality improves miscibility for a given viscosity grade. Humidity is measured in either relative humidity (relative terms) or dewpoint temperature (absolute terms). Increase in refrigerant charge increases the quantity of refrigerant in the system, which increased the cooling capacity and also the COP of the system (Eq.). Pump size, hose length, hose diameter, size of system to be evacuated, ambient temperature, suction line size, and the amount of moisture in the system. This moisture meter uses approximately 400–450 g of sample. 65. Ans: d 31. REFRIGERANTS: The working agent in a refrigerating system that absorbs or releases heat from the place to be cooled or refrigerated can be termed as a refrigerant. Control of moisture in products can be a vital part of the process of the product. Refrigerants differ widi respect of the amount of moisture in the soil, they can hold in solution and die effects, which absorbed moisture on system components. Share this question with your friends. REFRIGERANT PROPERTIES Refrigerants can be characterized by a number of properties. A. PLEASE COMMENT BELOW … How should gauge set hoses be sized for use in evacuating a system? This is the question you have to ask yourself before buying a dehumidifier to make sure the one you get complies to your expectations. Formerly the number of useful refrigerants was very limited. A column of refrigerant creating weight pressure in the liquid line can be a solution for flash-gas, but may have incidence in the expansion and evaporation. Answer to Presence of moisture in a refrigerant affects the working of (a) compressor (b) condenser (c) evaparator (d) expansion valve . However, if you notice a moisture buildup in a particular location of the refrigerator or if there are signs of excess moisture, these may be indications of a larger problem. Use the shortest length and the largest diameter possible for the quickest evacuation. There are a large number of refrigerants, which are used to transfer heat from low temperature reservoir to high temperature reservoir by using vapour compression refrigeration system. Definition. This heat transfer generally takes place through a phase change of the refrigerant. Definition. B (C.O.P.) Presence of moisture in a refrigerant affects the working of (a) compressor (b) condenser (c) evaparator (d) expansion valve. Ans: d. 30. < 75ppm There are 3 types of drier . The most preferred type of the refrigerant mixture is zeotropic mixtures. Having a little bit of moisture on the interior of a refrigerator is completely normal, depending on levels of humidity. Also, due to presence of moisture in air, acids or other corrosive compounds may form and this may affect the tubing of the refrigeration system. Loose fill driers . Name 3 things that moisture does in a refrigerant system? b. Thanks for sharing the informative post. Presence of moisture in a refrigerant affects the working of_____? Refrigerants are the working fluids for refrigeration and air conditioning systems. Use the shortest length and the largest diameter possible for the quickest evacuation. (e) heat transfer. Presence of moisture in a refrigerant affects the working of. Pump size, hose length, hose diameter, size of system to be evacuated, ambient temperature, suction line size, and the amount of moisture in the system. What factors affect the speed of an evacuation? What factors affect the speed of an evacuation? P = (C.O.P.) It is also very important for assessing storability, and it affects end-use value. This is very useful to know the working principle of refrigerant in the Air Conditioning Application. This method is satisfactory when the refrigerant is pure, but the presence of lubricant produces inaccurate results, because the lubricant is weighed as moisture. c. A pressure relief device on a refrigeration system shall have sufficient capacity to prevent the pressure in the pressure vessel from rising more than __ above the setting of the pressure relief device. Ans: d. 31. What is the Primary purpose of the Site Glass in a refrigerant system? Definition. Definition. Ans: d 30. Presence of moisture in a refrigerant affects the working of (a) compressor (b) condenser (c) evaparator (d) expansion valve. C. Lithium bromide. Reply. The interactions between the lubricant/refrigerant pair can affect film characteristics on heat transfer surfaces and ultimately overall energy efficiency of the system. In this paper, we shall study about the different refrigerants used in various refrigeration systems. Ans: d 31. Refrigeration in aeroplanes usually employs the following refrigerant (a) Co2 (b) Freon-11 (c) Freon-22 (d) Air (e) none of the above. C (C.O.P ) P = (C.O.P) R - 1 . Humidity is the presence of water vapor in the atmosphere. detect the presence of moisture in the system. Moisture is considered to cause significant damage to inorganic building materi-als. (e) heat transfer . Presence of moisture in a refrigerant affects the working of (a) compressor (b) condenser (c) evaparator (d) expansion valve. For assessing storability, and it affects end-use value presence of moisture in a refrigerant affects the working of % vapor form miscibility ( lubricant liquid... And health, the first tube working fluid through which heat is transferred from cold. For some serious long-term damage to inorganic building materi-als in terms of comfort and health, the first property is... 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presence of moisture in a refrigerant affects the working of 2021