1. The following list contains the descriptions of the most common types of evaporators. It is here that the liquid refrigerant is expanded and evaporated. Learn vocabulary, terms, and more with flashcards, games, and other study tools. – Compare and contrast dry-expansion and flooded evaporators. Glycol refrigeration system uses an external pump to deliver glycol solution to the evaporator coils to cool refrigerated cases. > As a professional refrigeration supplier, we manufacturer different types of evaporator and condenser, include the most popular ceiling type DD, DL, DJ evaporator, Dual discharge evaporator,small-sized evaporator, NH condenser, V type, U type, and W type condensers. In the thermosyphon evaporator design, the inside of the tubes are flooded with refrigerant, and the process fluid is on the shell side. Evaporator Types The two general types of evaporators used in today’s refrigeration systems are flooded evaporators and dry, or direct expansion (DX), evaporators. Rising Film Evaporators 3. It is connected between the receiver and the evaporator. – Explain the process of secondary refrigeration. Types of Evaporators Different types of evaporators are used in different types of refrigeration applications and accordingly they have different designs. There are two types of evap. 3.2 Different Types of Evaporators The chilled water enters from the top and flows downwards due to gravity and is then taken to a pump, which circulates it to the refrigeration load. The two general types of evaporators used in today’s refrigeration systems are flooded evaporators and dry, or direct expansion (DX), evaporators. Expanding flow evaporator. This lecture covers the various types of refrigeration that are available. The evaporator, the compressor, the condenser, and a flow-metering device such as an expansion valve. Forced Circulation Evaporators 4. By evaporation Method: Natural evaporation: The solution at below the boiling point temperature evaporation, such as seawater drying, in this case, because solvents only on the surface of the solution vaporization, solvent vaporization rate is low. Evaporator Types. horizontal type, vertical shell-and-tube type evaporators require less floor area. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. Refrigeration and Air Conditioning Training Course Evaporators and System Components 38 hours, 38 NATE CEHs, 3.8 CEUs – 360 pages Page 1 of 4 Lesson 1 - Refrigeration Evaporators Objectives: Identify various types of evaporators. Thermosyphon Evaporator. Objectives After studying this unit, you should be able to describe various types of compressor, describe various types of condenser, describe various types of evaporator, and describe various types of expansion device. The major use of this system is in beverage industry. However, the focus is on the most common type of refrigeration used in breweries: vapor compression refrigeration. In this form, there is no free surface in the evaporator (in contrast to the short-tube type—see Figure 3); the tubes are much longer and separation occurs in a separate vessel. The refrigeration cycle in a chiller consists of four key components: compressor, condenser, expansion valve, and evaporator as illustrated below. There are 2 types of Refrigeration cycles: 1. (f) Tube in tube evaporator. Start studying Unit 21 Evaporators and the refrigeration system. Flooded evaporator 2. available today. The chilled water enters from the top and flows downwards due to gravity and is then taken to a pump, which circulates it to the refrigeration load. : Forced Convection Type uses a fan or pump to force the liquid being cooled over the evap. Absorption Cycle Vapor Compression Cycle During the compression cycle, the refrigerant passes through four major components within the chiller. Vapor Compression Cycle 2. ; Evaporator Construction Types. Presentation On Evaporators (Refrigeration & Air Conditioning Lab) 2. They can be used as the as the partitions in the freezers, frozen food display cases, ice cream cabinets, soda fountains others. Thermosyphon evaporators (figure 3) are a common choice for large and small batch-type refrigeration loads where the process fluid is clean but viscous (viscosity greater than 6 cP). CLASSIFICATION OF REFRIGERATION SYSTEM. – Identify cascade and multiple-staging refrigeration systems. ; Natural Convection Type has the liquid being cooled flows naturally to the evap. We can also customize the evaporator and condenser for you. Bare tube coil evaporator 2. Basket-type Evaporator. Types of Refrigeration • Vapour Compression Refrigeration (VCR): uses mechanical energy • Vapour Absorption Re frigeration (VAR): uses thermal energy Vapour Compression Refrigeration • Highly compressed flu ids tend to get colder when allowed to expand • If pressure high enough Condenser is a heat exchanger that transfers heat from the refrigerant gas to an external cooling source (water or air are typical mediums). Each type offers its own benefit, and the most suitable type is selected in each case with consideration of the main process parameters: scaling tendency, product thermal sensitivity, annual operating hours, and accessibility for maintenance. Flooded Evaporators. There are three types of evap. the various types of refrigeration systems in common use along with their relative advantage and disadvantages, and to improve the performances of these systems. Classification of Evaporators: There are many types of evaporator, these are classified as: (1) According to the type of construction : (a) Bare tube coil evaporator. The evaporator is a heat transfer system, and is that part of a refrigeration cycle in which liquid refrigerant is evaporated for the purpose of removing heat from the refrigerated space or product. 9/8/2019 Types of Evaporators: Bare Tube, Plate Evaporators, Finned Evaporators 5/21 Sponsored Content Recommended by Plate types of evaporators provide excellent shelves in the freezers and similar applications. – List the main types of flooded evaporators. This type of evaporator is used mainly in applications for seawater desalination and refrigeration technology. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Select proper fin spacing for a particular application. Falling Film Evaporators 2. Glycol Refrigeration Systems. Some commercial refrigeration systems have one condensing unit, associated with two or more evaporators, Fig. Specifically glycol is a short form for propylene glycol that is an antifreeze. Mechanical Features: Type: 3.3” Shell and tube evaporator 5. Evaporators are manufactured in a wide variety of types, shapes, sizes and designs, and are classified in the following way:- Tube in tube evaporator According to the manner in which liquid refrigerant is fed 1. Plate evaporator 4. Definition : The evaporator is a heat transfer system, and is that part of a refrigeration cycle in which liquid refrigerant is evaporated for the purpose of removing heat from the refrigerated space or product. (c) Plate type evaporator. [1] Wide World of Refrigeration. This is a variant of the short-tube type in which the whole tube bank may be easily removed for cleaning. due to the density differences of the chilled and warm liquid. Plate Evaporators 5. Due to various advantages and flexibility … To satisfy the wide spectrum of process requirements, GEA designs solutions with all types of evaporators. Evaporator operating principle can summarize briefly as follows. The evaporators can be classified in various ways depending on the construction of the evaporator, the method of feeding the refrigerant, the direction of circulation of the air around the evaporator, etc. The evaporators may be classified into a forced convection type or natural convection type, depending on whether the substance to be cooled lows naturally by difference in density through the heat transfer surfaces of the evaporator or forced by pump or fan. Description: ICE 59 Motors are primarily used in the evaporator of commercial refrigeration walk-in coolers and freezers, but can be used in many applications demanding high efficiency and dependability with output ratings up to 7.6 watts. The reason for refrigeration is to remove heat from air, water or other substance. Finned tube evaporator 3. TYPES OF EVAPORATORS According to type of construction 1. In almost all evaporators the heating medium is steam, which heats a product on the other side of a heat transfer surface. 5.2 VAPOUR COMPRESSION SYSTEMS The challenge in refrigeration and air conditioning is to remove heat from a low temperature source and dump it at a higher temperature sink. Dry expansion evaporator 6. 2. Evaluate evaporator coil performance criteria. – Define eutectic solution and eutectic temperature. In this type of refrigeration system, the vapor produced in the evaporator passes into the absorber. The liquid is evaporated at the outside of the tubes. pressure side of a refrigeration system. (d) Shell and tube evaporator. ... stamped evaporator, multicircuit, finned tube bare pipe, liquid heat exchangers, drum type evaporator, plate type evaporator in a tank, pipe in pipe evaporator. Evaporator is an important component together with other major components in a refrigeration system such as compressor, condenser and expansion device. construction that are commonly being used today: Flooded Evaportators As the name implies, a flooded evaporator is always filled with liquid refrigerant. Presentation on evaporators 1. Evaporator in a cooling system in which the liquid evaporates and this order is Refrigerant device that extracts heat from its environment. Horizontal Film Evaporators. In the absorber, the vapor is absorbed and released from the absorbent, which … It flows from one tube to the other in form of droplets, jets or as a continuous sheet. (e) Shell and coil evaporator. Liquid refrigerant (dark red), flows through the thermostatic valves for evaporators. Evaporator. (b) Finned tube or extended surface type evaporator. The absorber consists of a homogeneous mixture of ammonia and water known as aqua ammonia. Shell and coil evaporator 6. Compared to horizontal type, vertical shell-and-tube type evaporators require less floor area. Long-tube Vertical Evaporator. Start studying Unit 21 Evaporators and the refrigeration system. – Describe three types of multiple-evaporator systems. Refrigeration is only one part of an entire industry built around keeping indoor air comfortable and healthy called heating, air conditioning, ventilation, and refrigeration (HVAC/R). 3-10, repeated (two or more) evaporator refrigeration systems are usually used in commercial refrigeration systems. 1. In other words, the evaporator is a refrigerant. As the name implies, a flooded evaporator is always filled with liquid refrigerant. 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