Heat exchange is a fundamental and important operation in chemical processing. Control of process conditions is critical to production of on-specification products, efficiently, economically and safely. Understanding the phenomenon of heat plate type heat exchangertransfer and the appropriate application of energy transport theory and its associated empirical relationships is a field that chemical engineers must master.

This spray heat exchanger tubes in rows is fixed to the steel, the thermal fluid flow in the pipe, cooling water leaching from the top of the uniform under the spray device, it is also known as the spray cooler. spray heat exchanger tube is a layer of film with higher levels of turbulence, heat transfer coefficient outside the tube increases much more immersive. In addition, most of this heat exchanger placed in the place of air circulation, cooling water evaporation is also part of the heat away, reducing the cooling water temperature can play, increasing the role of heat transfer driving force. Therefore, comparison, and immersion, spray heat exchanger greatly improved heat transfer.

The heat exchanger is a double-pipe heat exchanger.golden south sea pearl In the experiment you must investigate the exchanger performance by measuring various operating conditions and:

determining the heat load on the exchanger,
determining the steam film coefficient from a plot of the overall heat transfer coefficients versus water velocities,
estimating the exchanger efficiency from the data collected.

Tube heat exchanger tube heat exchanger is different from the direct control of the diameter into the concentric casing, connected together by the U-shaped bend. In this heat exchanger, a fluid tube to go, and the other take a fluid annulus, both can get a higher flow rate, so the heat transfer coefficient. In addition, tube heat exchanger, two fluids can be as pure counter-current, large logarithmic mean driving force. Simple tube heat exchanger, can withstand high pressure,tahitian pearl applications are also easy (according to the number of pipe sections need to change). Particularly because pipe heat exchanger heat transfer coefficient with the same time, heat transfer driving force big and strong to withstand high pressure advantage of the production process in the ultra-high pressure (for example, a pressure of 3,000 atmospheres pressure polyethylene production process) heat exchanger used in almost all bushings.

"Zones" can best be defined as regimes of phase changes where the overall heat transfer coefficient (Uo) will vary. Using T-Q (Temperature-Heat) diagrams are the best way to pinpoint zones. The system is defined as co-current or countercurrent and the diagram is constructed. The diagram on the left illustrates the use of T-Q diagrams. These diagrams should accompany your basic (input-output) diagram of the heat exchanger. Chemical #1 enters the shell at 200 0C as a superheated vapor. In Zone 1, it releases heat to the tubeside chemical (Chemical #2). Zone 1 ends just a Chemical #1 begins to condense. The tubeside (Chemical #2) enters as a liquid or gas and does not change phase throughout the exchanger.jewelry factory Chemical #1 leaves Zone 1 and enters Zone 2 at its boiling temperature, Tb1. T* marks the temperature of Chemical #2 when Chemical #1 begins to condense. In Zone 2, Chemical #1 condenses to completion while Chemical #2 continues to increase in temperature. The temperature of Chemical #2 when Chemical #1 is fully condensed is denoted at T**. Finally, in Zone 3, both chemicals are liquids. Chemical #1 is simply liberating heat to Chemical #2 as it becomes a subcooled liquid and exits the shell at 100 0C.

Posted by: eede at 07:05 AM | No Comments | Add Comment
Post contains 581 words, total size 4 kb.