[TRNSYS-users] Parameter settings for Type 534

[Song Aoye]

Dear All,




Does anyone know how to set up the immersed heat exchanger so that its heat transfer capacity can be increased?

My current setting is:

Exchanger type        horizontal tube bank
Fluid        20% Ethylene Glycol solution
Multiplier for Natural Convection Correlation        0.6
Exponent for Rayleigh Number        0.25
Geometry Factor        1
Geometry Factor Exponent        0
Tube lnner Diameter        0.098 m
Tube Outer Diameter        0.105 m
wall Conductivity        1440 kJ/h m K
Tube Length        30 m
Number of Tubes        1
Header volume        0.0226 m3
Cross Sectional Area        0.0075 m2


This setting will make it difficult for the cold energy of the fluid in the exchanger to be transferred to the water tank. 

When the temperature difference between the fluid in the exchanger and the water outside is 5 °C, the temperature of the fluid flowing into the exchanger will only increase by 0.13 °C after it flows out. 

So how should I change the above parameters to make the heat transfer ability of this exchanger stronger?
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