Calculation of coil type economizers
WAK Module package
The WAK program designs coil type economizers with multiple helical tube bundles. Water heaters or thermal oil heaters can be calculated. The standard medium is hot oil on the tube side and flue gas on the shell side. User-specific data for the flue gas can be entered or you may select standard compositions for typical gas , fuel, or solid fuel combustions.
Calculation of horizontal or vertical exchanger arrangement is possible. The flow pattern is either countercurrent or cocurrent. The program suggests parallel flow in coils and annulus.
An improved calculation of the flue gas-side heat transfer allows longitudinal pitch ratios from 1.0 on (the tubes are are narrowly coiled and welded). In the calculation, the effect of radiation from the flue gas is taken into account.
The maximum film temperature is calculated for the coil with the lowest heat transfer coefficient and for the section with the highest temperature level.
|Physical properties of||Module||Standard
|Water and Steam||H2O||x|
|12 typical machine oils||OEL||x|
|more than 120 thermal oils||T-OIL||x|
|8 Heavy fuel oils and Diesel||HFO||x|
|Free input of properties of coil-side media||S-DAT||X|
|Refrigerants / Cooling agents||FRIG||x|
|Interface to properties generator PROPER - for coil-side media only||PROP||x|
|General properties module for user supplied property tables||S-TAB||x|