The multiple-effect configuration combines two or more evaporator bodies to conserve steam, which is condensed in the first-effect heat exchanger only. Discuss the advantages and applications of multi-evaporator systems compared to single stage systems (Section 13.1) 2. In evaporation facilities, the cost of processing is primarily determined by the amount of steam consumed. 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. Alaqua’s multi-purpose compact evaporators have numerous advantages that make them excellent choices for dairy, beverage, specialty food, and industrial fluid applications. In our Evaporators, no Jet Cleaning is required. Energy and economical equations are given with a case study for multiple effect evaporator system. 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. As a part of TURNKEY PROJECTS, we have been designing and developing AXIAL FLOW PUMPS in various MOCs which are regularly tested on our test benches and then dispatched to our customers. 17.6 System P-H diagram of a multi- evaporator with a single compressor and multiple expansion valves, Mass flow rate of refrigerant (m1) in E1= 210 x T1 /h7- h4 kg/min, Mass flow rate of refrigerant (m2) in E2= 210 x T2 /h8- h6 kg/min. Thanks 0. 1.0 1 vote 1 vote Rate! such cases it may be advantageous to use a multi-evaporator system with the low temperature evaporator operating at –30oC and the high temperature evaporator operating at 2oC Version 1 ME, IIT Kharagpur 3. Figure 1: IDEC System [Adapted from Al-Juwayhel, et al. Advantages Of Evaporative Cooling Systems. of the system = 210 x (T1+T2),kJ/min / work of compression,kJ/min, Mass flow rate of refrigerant (m1) in E1= 210 x T1 /h6- h4 kg/min, Mass flow rate of refrigerant (m2) in E2= 210 x T2 /h7- h5 kg/min. Another alternative is to use a single refrigeration system with one compressor and multi- evaporators operating at different temperatures as per the requirement of the products. Units are relatively inexpensive, provided that they are made of carbon steel or cast iron. Industrial multi-tube (K series) Scraped-surface Rotative (RM series) Scraped-surface ASTUTE . Multiple effects, or stages, are now used to minimize the energy input required to evaporate or boil off undesirable water content.. New questions in Chemistry . There is easy control of fluctuations in loads by controlling individual evaporator. The refrigerant from receiver is supplied to evaporators through individual expansion valves and the vapour produced in evaporators is pumped by the compressor. They do not use refrigerants like CFCs and HCFCs for the cooling process, so there are no greenhouse gases emitted. … M ultiple - effect evaporator. ‒ Easy Operation and Maintenance. 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. This paper presents a control system for multi-effect evaporator, which is aimed at: (a) ensuring high accuracy of solid concentration in the outgoing liquor vis-à-vis the set-point, and (b) a fast response to any disturbance in the input liquor. Lesson 21. The refrigerant leaving the bottom of the receiver is 100% liquid. As instance, milk is normally stored at 3-4 o C while ice-cream storage requires –30 o C temperature. They are environmentally friendly. Multiple effects, or stages, are now used to minimize the energy input required to evaporate or boil off undesirable water content. But, this may not be economically choice due to the high total initial cost of different systems. 17.2. As result of calculations, it has been found that about 3.51 of overall economy is obtained according to single evaporator. Lesson 19. 1 To 6, Royal Industrial Estate, Nr. ‘ In such arrangement effects can be evaporators and crystallisers, of any type and also stripping column and flash vessels. evaporator, compressor, condenser and expansion valve, the flooded system needs a receiver (no. Applications & Advantages of Multi Effect Evaporator: ... We are able to offer a high-class Multiple Effect Evaporator System to our clients. Fig. Key Words: Refrigeration, Evaporator, Condenser, Compressor I. Lesson 18. Moreover, the vapor also displaces the air in the steam space of the 2nd evaporator. Water evaporated in the first-effect vapor body is condensed in the second-effect heat exchanger, which provides energy for evaporation in the second-effect vapor body (and so on for additional effects). Our systems also come with complete instrumentation and automation package which reduces the man power and efforts in running the system, thus making the system more User-Friendly. C.O.P. Shail Vac provides multi stage evaporation systems, so it is idle for high crystallization and viscosity solutions. 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. There are many applications in dairy and food plants where refrigeration is required at different temperatures depending on the type of products to be stored. Howard L. Freese, in Fermentation and Biochemical Engineering Handbook (Third Edition), 2014. Thermodynamic Analysis 5.2. 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. IDEC systems provide cooler supply air at a lower relative humidity than direct evaporative coolers. But generally multi evaporator systems are overlooked by assuming it as complex system and hence a problem arises in maintaining specific temperature conditions economically. Long-tube evaporators normally are designed with tubes 1″ to 2″ in diameter and from 12′ to 30′ in length. Cost-effective due to cheaper price and energy efficiency: Some of the notable advantages of an evaporative cooler over a traditional air conditioning unit include a more affordable price and lower energy consumption. Multi split air conditioner systems can easily have several interior units linked to one outside unit; the interior units can be wall mounted, floor standing, ceiling cassettes, bulkhead devices plus more and are connected by refrigerant pipelines and cables to one outdoor unit. The refrigerant from the receiver enters the evaporator (no. 3.7x10⁴ contains how many significant figures? 17.3 Two Evaporators operating different temperature and one compressor system, Fig. A pressure reducing valve is installed to reduce the pressure of the vapour corresponding to the pressure of lower temperature evaporator. Numerical on multi-evaporation and comp... Last modified: Friday, 19 October 2012, 5:31 AM, Fig. ‒ Solvent Volume Reduction is a solution. The enthalpy of suction vapour can be obtained by taking heat and mass balance of the refrigerant vapour leaving the evaporators. Lesson 20. Rupala Automobiles, © Copyright Shail Vac Engineers. Benefits: The advantages of evaporative cooler. This is possible as the flash gas is removed at state 4. This process is repeated in successive stages where the pressure decreases according to different conditions. The working cycle of the system is represented on P-H diagram in Fig. They are energy efficient. II. The latent heat of the vapor leaving in single effect evaporator is not used but is discarded. Understanding the needs and concerns of our customers we have been taking complete turnkey projects. It is also necessary to use multi-evaporator and two stage compression system if the compression ratio is more (>7). Multiple-effect evaporation. Applications of Multi-Effect Evaporators: Advantages: ‒ Product Concentration . ‒ Water/Solvent Recovery. Describe multi-evaporator systems using single compressor and a pressure reducing valve with: a) Individual expansion valves (Section 13.2.1) b) Multiple expansion valves (Section 13.2.2) 3. Multi-stage flash distillation (MSF) The water to be desalinated is heated at low pressure, which causes sudden, irreversible evaporation. mechanical advantage of a wedge less more Evaporator Multiple Effect Evaporator Application: Single - effect external circulation evaporator is suitable for the evaporation process of liquid materials in the industries of pharmacy, food, chemical industry, light industry etc. (2004)] Ideal for heat-sensitive products, up to 20,000 lbs/hr (~9,000kg/h) water removal … Thermally Driven Compressor 6.1. Fig. Rate! The cogeneration system of a sugar factory consists of boiler, steam turbine, and sugar juice evaporation process. 17.5 and Fig. 5.5 Long-Tube Vertical Evaporators. 1. Multieffect Falling Film Evaporators 4.2. cost of material and installation of the evaporator system increases because of the large number of effects involved. This can result in significant savings, especially in hot desert climates. Highly economical when compared to single effect. We Are the Leading Multiple Effect Evaporators Supplier. 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. = 210 x (T1 + T2) / (m1 + m2) (h2 - h1), 17.2.2 Multi- evaporators operating at different temperatures. Description. The saturated suction vapour having h1 enthalpy is compressed to condensing pressure and the enthalpy the discharged vapour is h2. 1, Figure 6.44) to separate the twophase mixture after the expansion valve (no. Module 5. - Product is obtained at lowest temperature. Our company can help you in developing a multiple effect Evaporator that will fulfill your custom application requirements. CASCADE CONTROL FOR MULTI-EFFECT EVAPORATOR Control of multi-effect evaporators is different from that of a single evaporator. In addition to the basic equipment in a direct expansion refrigeration circuit, i.e. The single effect evaporator uses rather more than 1 kg of steam to evaporate 1 kg of water. 5). Therefore, it is very common under field conditions to use multi-evaporators maintained at different temperatures. Key words: Multiple-effect evaporator, evaporator selection, design 1. For a multiple – effect evaporator system calculations, the values required to be obtained are (i) The area of the heating surface in each effect, (ii) The kg of steam per hour to be supplied, and (iii) the amount of vapour leaving each effect, particularly in the last one. Example 6.2. 2, Figure 6.44) and evaporates due to the he… 17.2.1 Multi- evaporators operating at the same temperature . A block diagram of vapour compression refrigeration consisting of two evaporators operating at different temperature and one compressor system is shown in Fig. 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. Multiple effect evaporator Due to heat transfer, the liquid temperature increases & reaches the B.P. There has to be trade-off between the material cost and the steam cost and the number of effects giving the minimum total cost is the most thermo-economic solution. In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. 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Freese, in Fermentation and Biochemical engineering (! The liquid temperature increases & reaches the B.P the above analysis may deviate, if there is any of... 6.44 ) to separate the twophase mixture after the expansion valve, cost. Of processing is primarily determined by the amount of steam consumed various exotic MOCs considering above. Help you in advantages of multi evaporator system a multiple effect evaporator Due to heat transfer, the vapor leaving single..., or stages, are now used to minimize the energy input required to evaporate.!, it is possible as the flash gas is removed at state 4 economy is according... And hence a problem arises in maintaining specific temperature conditions economically, while evaporator ice-cream! Standard air conditioner systems, multi evaporator and one & for continuous.! Is heated at low pressure, which are accessible for Cleaning using some is... 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