Economiser, some FAQs

Guide for better economiser design Is it essential to pre heat feed water? How one preheats they boiler feed water? We have two options, Via economiser, mounted on exhaust of boiler, and heating incoming feed water by absorbing lost heat in flue gases Via Deareator tank, adding steam to deareator and heating the water temperature.

Energy Required to Heat Air

Recently I came across this requirement of calculating heat required to heat air (for AHU), I came across two simplified formulas, as follows. Please also note the learning from this workout at the bottom! Learning! for delta T, Centigrade vs Fahrenheit are different! I was thinking, as long as its Delta (Difference between two temperature),

Tube Holes in Tubesheet : Point to ne noted while designing heat exchanger

Tube hole finish affects the mechanical strength and leak tightness of an expanded tube-to-tubesheet joint. In general: (1) A rough tube hole provides more mechanical strength than a smooth tube hole. This is influenced by a complex relationship of modulus of elasticity, yield strength and hardness of the materials being used. (2) A smooth tube

Design of heat exchanger step :5 : Parameter Calculations

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

Differences Between The Eighth And Ninth Edition Of The TEMA

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

Design of heat exchanger step :4 : Thermal Design

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

TEMA Learning -Heat Exchanger nomenclature & Designation:

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

Design of heat exchanger step :3 : Estimate

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

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