How Do You Calculate The Heat Transfer Area Of A Shell And Tube Heat Exchanger?

How do you calculate heat transfer coefficient of tube side?

Raghavan, 2011.

The Tube Side Heat Transfer Coefficient for Enhanced Double Tube by Wilson Plot Analysis.

Journal of Applied Sciences, 11: 1725-1732….NOMENCLATURE.a=Annulus ratio (Do/Di) (m)UO=Overall heat transfer coefficient (W/m2.K)V=Flow velocity (m/s)X=Wilson plot function (K/W)25 more rows.

What is h in heat transfer?

The approximate rate of heat transfer between the bulk of the fluid inside the pipe and the pipe external surface is: where q = heat transfer rate (W) h = convective heat transfer coefficient (W/(m2·K)) t = wall thickness (m) k = wall thermal conductivity (W/m·K) A = area (m2) = difference in temperature.

Why is there a pressure drop across a heat exchanger?

Optimization of thermal design requires maximization of overall heat transfer coefficient and / or effective mean temperature difference (EMTD) so as to minimize the heat transfer area subject to the constraints, pressure drop being the major one.

How do you calculate the number of passes on a heat exchanger?

The number of passes in a heat exchanger is generally determined by the total flow of tube side fluid, the exchanger area requirement, allowable pressure drop and any limitations in tube length (location, access, bundle pulling requirements, etc).

How do you calculate pressure drop in heat exchanger?

Step by step heat exchanger pressure drop calculation – Total flow on the tubeside can first be divided by number of tubes and pressure drop across a single tube can be calculated using Darcy-Weisbach equation. This corresponds to the tubside pressure drop.

How does shell and tube heat exchanger work?

As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids.

How do you create a shell and tube heat exchanger?

The heat transfer analysis is done by considering water inside the tube and steam on shell side. The design of shell and tube heat exchanger using Kern method for water and steam combination is validated by well-known Dittus-Boelter equation of turbulent flow inside tube.

What is the formula for pressure drop?

Pressure-loss form where the pressure loss per unit length ΔpL (SI units: Pa/m) is a function of: … μ is the dynamic viscosity of the fluid (Pa·s = N·s/m2 = kg/(m·s)); Q is the volumetric flow rate, used here to measure flow instead of mean velocity according to Q = π4Dc2 (m3/s).

What are the parts of a heat exchanger?

The Major Components of Heat ExchangersThe Tubes. Tubes are perhaps the most important component of a heat exchanger. … Front and Rear Headers. The front and rear headers of heat exchangers are where the liquid enters and leaves the tubes. … Transfer Line Exchangers. … The Air Cooling System. … Why Heat Exchange Is Necessary.

How do you calculate the overall heat transfer coefficient for shell and tube heat exchanger?

1/U = 1/h****o + (r****o – ri)/k + 1/h****i (Note that the thickness of the tube wall, ro – ri, is represented by the symbol ΔXw in the diagram at the right.) This equation gives an estimate for the overall heat transfer coefficient, U, for a new heat exchanger, or one with newly cleaned heat transfer surfaces.

How do you calculate the efficiency of a heat exchanger?

The efficiency of heat exchanger is ratio of actual temperature drop to the maximum temperature drop.

Why shell and tube heat exchanger is used?

Why are Shell and Tube Heat Exchangers Used? Shell and tube heat exchanger is used in various industrial process applications because they can perform tasks such as: Removal of process heat and feed water preheating. Cooling of hydraulic and lube oil.

What are the two types of heat exchangers?

There are two main types of regenerative heat exchangers—static heat exchangers and dynamic heat exchangers.

How does pressure drop affect heat transfer?

When a flow is disturbed, a pressure drop (ΔP) is created, i.e. the flow pressure at the beginning of a passage is higher than at its end. Pressure drop is a phenomenon with both positive and negative consequences for the heat transfer process.