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o Metal workers use refrigeration to temper steel and cutlery. ... Now a vapor, refrigerant "spotted red line" flows back to compressor and is compressed to high pressure "red dots". The compression process somewhat follows the constant entropy line on the P-H diagram (Figure 8). insult2injury (Mechanical) 7 Aug 06 22:23 A mixture of the right fuel and anhydrous ammonia makes a very good explosive and I believe it is a bit volatile as well. Unlike earlier vapour-compression machines, which used air as a coolant, Carré’s equipment contained rapidly expanding ammonia. ... consists of several mechanically moving parts. 2 in that a portion is withdrawn after each of the first three heat exchangers at 148, 150 and 152 and expanded at 154, 156 and 158. 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 Novel Vapor Compression Cycles with High Energy Efficiency Using Natural Refrigerants for Three Kinds of Appliances Jianhua WU*, Jiachen LI School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an710049, China A schematic of a basic vapor compression system is shown in . vapor compression refrigeration cycle is shown in Figure 4. This is the mechanical engineering questions and answers section on 'Refrigeration and Air Conditioning' with the option for disscussion in forum , usefull for competitive examination and entrance test like GATE ESE PSU. Solved examples with detailed answer description, disscussion in forum helps in easy to understand concepts. Refrigeration System. Because the feedwater is generally conventional tap or non-potable water the feed lines will accumulate salts or other contaminates over time and corrode the metal surfaces. related issues like global warming, carbon foot print, etc. In this lecture, it is … The Refrigeration System. The refrigerant continues changing from liquid to vapour state when absorbing heat and from vapour to liquid when giving out heat. One ton of refrigeration is equivalent to a refrigeration rate of 12, 600 KJ/h in SI units. 3. THE COMPRESSION REFRIGERATION CYCLE This process is called a Compression Refrigeration Cycle, and consists of boiling a liquid refrigerant to a vapor in an evaporator, during which heat is absorbed by the refrigerant, thus producing cooling (refrigeration); passing this heat-laden low pressure vapor to a compressor where its pressure is raised We want to design a vapor-compression refrigeration cycle to absorb heat from a cool environment and reject it to a warm environment. since it is subcooled somewhat before it enters the throttling valve. For this reason, the coefficient of performance (COP) of the subcooled vapour compression refrigeration system in which the subcooler acts as the evaporator for the subcooling cycle is significantly higher than that of the main refrigeration … Intercooling does not imply a significant reduction in compression power, and can even increase it. B Vapor Absorption Refrigeration System 3. The temperature at which a change of state occurs is constant during the change, provided the pressure remains constant. The constant entropy lines extend at an angle from the saturated vapor … 2. 1. The corresponding heat transfer processes can be represented on a plot of pressure versus enthalpy as shown in . Table 3 shows the inlet volumetric flow rates required to achieve 350 ton of cooling. Fluids absorb heat while changing from a liquid state to a vapor state. This process goes against the natural process of heat energy flowing from hot to cold. moving trolley fabricated for that purpose. Freon-12 was used to … Any refrigerant within the injected slug is quickly vaporized and travels with the discharge gas to again accomplish useful cooling. Figure 2. The device traps liquid slugs in the suction pipe and then injects the trapped slugs into the discharge pipe. A Carnot refrigerator will have highest value of COP for a given set of values Tc and T H. A vapor compression cycle with expansion in a throttle valve has somewhat lower value and this is further reduced when compression in not isentropic. unit 1.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. RE: Refrigerant in Vapor Compression Refrigeration Cycle -- How to decide? The design is to be based upon the ideal vapor-compression refrigeration cycle, with four components: a cooler (where we reject the heat), a throttle, a heater (where we absorb the heat), and a compressor. Effects of Super Heating-Useful superheating increases both the refrigeration effect as well as the work of compression. 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