Also saving in initial cost and space required are the additional advantages with single compressor multi evaporator systems. Multi-stage flash distillation (MSF) The water to be desalinated is heated at low pressure, which causes sudden, irreversible evaporation. In our Evaporators, no Jet Cleaning is required. Example 6.2. The refrigerant is supplied to two evaporators operating at different temperature through individual expansion valves. A multiple-effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. A series of evaporators working in association constitute a multiple effect evaporator system, a name give because the original steam boiler accomplishes its effect several times. 1.0 1 vote 1 vote Rate! (2004)] Description. Rate! 17.3. 1, Figure 6.44) to separate the twophase mixture after the expansion valve (no. Multiple effect evaporator Due to heat transfer, the liquid temperature increases & reaches the B.P. 17.5 and Fig. … But generally multi evaporator systems are overlooked by assuming it as complex system and hence a problem arises in maintaining specific temperature conditions economically. Using a multiple effect evaporator, the operation is based on the steam produced in one effect being used as the heat source for the following effect. The refrigerant from receiver is supplied to evaporators through individual expansion valves and the vapour produced in evaporators is pumped by the compressor. They are environmentally friendly. Thermodynamic Analysis 5.2. 17.4 Working Cycle of two evaporators operating two different temperature and one. Advantage of Forward Feed Multiple Effect Evaporator : - In this arrangement the feed and steam introduced in the first effect and pressure in the first effect is highest and pressure in last effect is minimum, so transfer of feed from one effect to another can be done without pump. C.O.P. Solution 6.3. The refrigerant leaving the bottom of the receiver is 100% liquid. 17.3 Two Evaporators operating different temperature and one compressor system, Fig. A vapour compression system having two evaporators operating at the same temperature with single compressor is shown in the Fig.17.1 and the corresponding cycle is presented on P-H diagram in Fig. during this process, vapor well be generated from the liquid feed. Lesson 19. A multi-evaporator system is a vapor-compression refrigeration system generally consisting of four major components: Evaporator; Compressor; Condenser; Thermal expansion valve; Sometimes in a refrigerator several loads are varied. The enthalpy of the suction gas is determined as under. The cogeneration system of a sugar factory consists of boiler, steam turbine, and sugar juice evaporation process. Figure 1: IDEC System [Adapted from Al-Juwayhel, et al. ‘ In such arrangement effects can be evaporators and crystallisers, of any type and also stripping column and flash vessels. 17.2 Multi-Evaporator Systems With Single Compressor. One simple alternative is to use different refrigeration systems to meet different requirement of temperatures for different cold storages. Numerical on multi-evaporation and comp... Last modified: Friday, 19 October 2012, 5:31 AM, Fig. Highly economical when compared to single effect. Advantages Of Evaporative Cooling Systems. The multiple-effect evaporator used for the conventional sugar juice evaporation process is the forward-feed multiple-effect evaporator, in which steam and sugar juice flow in the same direction. This process is repeated in successive stages where the pressure decreases according to different conditions. In evaporation facilities, the cost of processing is primarily determined by the amount of steam consumed. 17.2 Multi-Evaporator Systems With Single Compressor, 17.2.1 Multi- evaporators operating at the same temperature. 1. In our Evaporators, no Jet Cleaning is required. More evaporator systems employ this type of design than any other because it is so versatile and is often the lowest cost per unit of capacity. Vapor well be generated from the liquid feed flash distillation ( MSF the... Are given with a single compressor, Condenser and expansion valve ( no necessary to use multi-evaporators maintained different., evaporator, evaporator, and so on 13.1 ) 2 compressor evaporator... Found that about 3.51 of overall economy is obtained according to single evaporator is any superheating of or... 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