How is double pipe heat exchanger calculated?

(Pr) number for each stream. For first iteration a Length of double pipe exchanger is assumed and heat transfer coefficient is calculated. Viscosity correction factor (μ / μw)0.14 due to wall temperature is considered 1. For Laminar Flow (Re <= 2300), Seider Tate equation is used.

How can you increase the efficiency of a double pipe heat exchanger?

Maximizing the surface area of the wall between the two fluids improves the efficiency of the heat exchanger but as with surface treatments, often results in an increase in pressure drop.

What is a double pipe heat exchanger?

DOUBLE PIPE HEAT EXCHANGER. A double pipe exchanger consists of one or more pipes or tubes inside a pipe shell. Basically two straight pipe lengths are connected at one end to form a U or “hair-pin.” Longitudinal fins may be used on the outside of the inner tube.

What is the efficiency of heat exchanger?

The heat exchanger efficiency is defined as the ratio of the actual rate of heat transfer in the heat exchanger, q, and the optimal rate of heat transfer, qopt,(1) η = q q opt = q U A ( T ‾ – t ¯ ) The optimum (maximum) rate of the heat transfer is the product of UA of the heat exchanger under consideration and the …

How do you calculate pressure drop in a double pipe heat exchanger?

Total volumetric flow = 50000 kg/hr ÷ 988.0 kg/m3 = 50.61 m3/hr Volumetric flow in each 1″ tube = 50.61 ÷ 25 = 2.02 m3/hr Pressure loss per unit length of the tube is then calculated using EnggCyclopedia’s pressure drop calculators for pipes and tubes.

Which is more efficient shell and tube heat exchangers or double pipe exchangers?

The increment in heat transfer coefficient was determined for both cases and compared. It was found that the increment in heat transfer performance in shell and tube heat exchanger is better in comparison to double pipe heat exchanger.

Which pipe is more efficient in terms of heat transfer?

A loop heat pipe (LHP) is a passive two-phase transfer device related to the heat pipe. It can carry higher power over longer distances by having co-current liquid and vapor flow, in contrast to the counter-current flow in a heat pipe.