3 types of evaporators pdf

Evaporator types can be divided into three main groups according to the characteristics of the application. Unit 3 refrigeration equipment refrigeration equipment. Types of evaporators 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. Nptel chemical engineering chemical engineering design ii joint initiative of iits and iisc funded by mhrd page 2 of 31 lecture 1. In almost all evaporators the heating medium is steam, which heats a product on the other side of a heat transfer surface.

Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Two main categories of evaporators used in industrial refrigeration practices air coil and liquid coolers. The liquid is evaporated, or vaporized, into a gas form of the targeted substance in that process. Longtube vertical evaporators the three types of longtube vertical. The 12foot continuousflow evaporator is the most common. Each type offers its own benefit, and the most suitable type is selected in each case with. Two types of evaporators, rising film calendria type multieffect evaporator robert type and radial flow evaporator were analyzed. Multieffect boiling of a submerged tube desalination system 3.

Types of evaporator free download as powerpoint presentation. Circulation and heat transfer in this type of evaporator are strongly affected by the liquid level 3. Compressor basic refrigeration cycle evaporator condenser receiver expansion. Evaporators can be arranged in forwardfeed, reverse feed or parallel feed. The type of equipment used depends largely on the method of applying heat to the liquor and the method of agitation. Evaporators may be batch kettles or continuousflow types. These types of evaporators are often used with product recirculation, where some of the formed concentrate is reintroduced back to the feed inlet in order to produce sufficient liquid loading inside. In the plate type of evaporators the coil usually made up of copper or. The following list contains the descriptions of the most common types of evaporators. Classification of the evaporators based on the construction.

Types of evaporators this bulletin is intended to provide an introduction to the primary types of evaporators which are implemented in various industries today. The greater the temperature difference, the faster the energy. Evaporator refrigerant evaporates in the heat until, given a little more heat before giving the suction side and anger come to between 38 c. Describe how a voltmeter is used to troubleshoot an. It was observed that the total steam consumption of robert type evaporator was 36. As boiling proceed, liquid level in 1st evaporator comes down. The evaporator is a heat transfer system, and is that part of a. Unlike singlestage evaporators, these evaporators can be composed of up to seven. They condition the air in a room, and as the air passes over the coil, heat is. This handbook describes the many types of evaporators and operating options available through the experience and manufacturing capabilities of companies within the apv group. The evaporators used for the refrigeration and the air conditioning applications have different types of construction depending on the application. Installation and table of contents operation manual.

Microchannel evaporators are starting to become available. Evaporator selection the rapid development of the process industries and of new products has provided many liquids with a wide range of physical and chemical properties all of which require concentration by evaporation. Since the thickness of the liquid film layer on the outer surface of the tube. Evaporators visual encyclopedia of chemical engineering. Every evaporator design will have a means of transferring heat energy through a heat. The tubes in longtube vertical evaporators are typically 2 in. Here, there is a short region of nucleate boiling near the evaporator entrance but the main part of the evaporator has. Evaporation technology is used to turn the liquid form of a chemical substance such as water into its gaseousformvapor in order to separate undesirable substance from the liquid and purify it.

Finally 3 evaporators come to a steady state with the liquid boiling in all the 3 bodies. There are other types of plate evaporators, which work with only climbing film. This type of evaporator has higher rate of heat transfer, less contact. The liquid is typically heated only a few degrees for each pass through the heat. There are several methods of defrosting evaporators exposed to air. They may be operated in either batch or continuous modes. This guidance is intended to respond to those requests from generators and address the concerns of.

Evaporators in which heating medium is separated from the evaporating liquid by tubular heating. Mechanical engineering channel anuniverse 22 has started to stand on the shoulders of engineering giants and now, it is a place to hang out to learn the basics of mechanical. Evaporator types of evaporators absorption chiller. It is intended to transmit a steady quantity of liquid refrigerant inside the evaporator, and the amount is sustained by a float valve or. To satisfy the wide spectrum of process requirements, gea designs solutions with all types of evaporators. The third classification is flooded type and dry type. An evaporator is a device in a process used to turn the liquid form of a chemical substance such as water into its gaseousformvapor. Evaporator type gea engineering for a better world.

Design and operation of various types of multiple effect evaporators. Brine is pumped in hot weather to reservoirs of 100,000 m2 in area to a. Evaporators with direct heating the use of solar heat for the production of glaubers salt has been described by holland22,23. The evaporators used to cool the gaseous substance usually air substances in the case of liquid refrigerant evaporators water, brine, antifreeze, methylene glycol, chemical fluid, etc.

Accordingly, most evaporators are broadly classified as. Optimization of a multiple effect evaporator system. Shorttube vertical evaporators the shorttube, or calandria, vertical evaporator figure 3 is one of the earliest types still in widespread commercial use 3. It was observed that the total steam consumption of robert type evaporator. Externally the plate type of evaporator looks like a single plate, but.

They are similar to those used for condensers section 6. Types of evaporators batchtype pan, natural circulation, risingfilm, fallingfilm, risingfallingfilm, forced circulation, agitated or mechanical thinfilm capacity of evaporator mass of vapor produced. In a typical rising film evaporator, the heat exchanger is mounted vertically. Evaporator coils are specially made air conditioner parts that play an important role in the proper functioning of any ac unit. 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. The following list contains the descriptions of the most common.