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In the process of evaluation of U, we need to calculate various parameters. Below paragraph mentions few of them. 1. Reynolds number (Re) Reynolds number, which relates inertial forces to viscous forces and thereby characterizes the type of flow regime2. Prandtl number (Pr), which relates the thermal properties of the fluid to the conductivity of […]
Ok, TEMA Ninth edition is here. Other Than complete change in Page Indexing (Page number), Following are note worthy changes from eigth edition : Followings are Prominent Changes and Listed at TEMA website 1. New rules for flexible shell elements (expansion joints), which are based on a Finite Element Analysis (FEA) approach. 2. Tables for […]
Next step, do a detailing. To Calculate LMTD, we need to understand the flow and type of process (Isothermal or not) Generally we have complication, when either of fluid is showing isothermal characteristics. see the following variation. Two fluids are separated by a heat transfer surface (wall), these fluids ideally do not mix, and there […]
Heat Exchanger nomenclature & Designation:The name is splited in three portions e.g 23-192-BEM 1st Position : 23 : Defines, ID of Vessel2nd Position : 192 : Defines, Tube length3rd Position : BEM : it further splited in three parts as per fing N-1.2e.g B-E-M, the 1st section, defines the Type of Front head (B for […]
The 3rd Step in Heat exchanger design a preliminary estimate of the size of the exchanger is made,using a heat-transfer coefficient appropriate to the fluids, the process,and the equipment. Generally we can get reference from various resources listed below, either expected heat flux (W/m2) or range of heat transfer co-efficient. based on this information, we can […]
During Resent days, I was trying to design thermosiphon reboiler! After long days of calculation, rewriting calculations on pages! on excel! finally I come to some ‘lesson learn’ which I’ll be sharing now. But before that, following are two good references to design a thermosiphone reboiler1. Applied Process Design Volume-3 by Ludwig2. Process Heat Transfer – […]
Hi Guys… For Past so many days, missed my blogging instinct. Now I’m back, with some spare time, lets start with Knowledge sharing! Keep Reading & Smile
The next step is to decide which type of exchanger to be used?The industrial heat exchanger are varies depending upon 1. Transfer process.2. Number of fluids3. Compactness.4. Constriction.5. Flow arrangement.6. Type of heat transfer.See attached figure for more details.
<p>The first step dorm designing a heat exchanger is to understand where it will be used for.</p><p>Application is most important criteria and mostly its input from client.</p><p>Application demands understanding of functionaries expected, duty needed, properties of both side fluids, system information e.g presuredrop expected, cleaning method of the equipment, hazard category, local laws pertaining to […]
Yup, just a brief on this subject. Heat exchangers are devices used to transfer heat energy from one fluid to another, gas to gas or gas to liquid. Typical heat exchangers are seen around in most unexpected location. From household appliances as air conditioners, refrigerator etc. Boilers and condensers in thermal power plants are examples […]