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The AC module package is a design tool for bare or finned tube (circular finned, spiral fins with ripples, rectangular finned, fin plates) cross flow heat exchangers. Physical properties of the used media may be entered manually by using the "free input" feature. The evaporation and condensation of pure substances in the tubes is possible. |
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The following heat exchangers can be designed with the AC module package | |
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Cooling of any medium with air, |
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Heating of air or other gases with saturated steam, hot water etc. |
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At extra charge: |
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Heating and cooling of pools or any rooms in free convection |
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In general, heat transfer in tube bundles with rectangular or circular finned tubes as well as heat exchanger batteries can be calculated.
Extension: The given area reserve and the actual outlet temperatures of the media (often differing from the required temperatures) are determined. To determine the temperature distribution in crossflow, a sophisticated cell method is used. The geometrical data of the tube sheet can be saved as CAD file.
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The program calculates multi-pass bundles and shells. Tube pitch and tube pattern are selectable freely. It is possible to specify circular or square fins as well as bare tubes and corrugated tubes. Circular or square shells are possible.
Tubes may have circular cross section. If fins are used, the tubes may also have oval or rectangular cross section. |
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Single-phase: |
The calculations in single-phase heat transfer are based on the theoretical principles found in the VDI Heat Atlas. |
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Condensation |
When cooling down air or humid gases, condensation of the humid part at the cold wall is considered. The thermal transfer is calculated by using the method of [1] page 108. The amount of water or the humidity are calculated as well. If the wall temperature is below zero or if there is a huge amount of condensed water the program displays warnings. |
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Evaporation |
Evaporation of pure substances in tubes is calculated according to the VDI Heat Atlas. |
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The program supports several media for which the properties are automatically determined. Among those substances are e.g moist air, flue gas, a widely used cooling gas (H2N2) and water. Property modules, which were especially created by user request, can be integrated into the program. This also holds for condensing media. For other media, which are not subject to phase changes, the user enters mean values for the necessary properties. The integration of our property data generator program PROPER to determine properties and phase equilibria of more than 800 substances is also possible at extra charge.
* Included since version 8.5
| Properties | Module |
| Refrigerants with / without condensation or evaporation | FRIG |
| 1,2 + 1,3 propylene glycol, ®Antifrogens (Clariant) | GLYK / GLYC * |
| Helium gas | He |
| Moist gases with condensation | HX * |
| Ammonia | NH3 |
| Nitrogen | N2 |
| Nitrogen / hydrogen mixture, any composition | N2H2CO |
| Proprietary oils, classified according to viscosity | OEL * |
| Properties of pure substances and mixtures | PROPER |
| Sea water | SAWA |
| Declaration of property tables | STAB |
| Heat transfer oil | TOIL * |
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® Registered trademark of Clariant GmbH |
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| Construction types | |
| Natural convection (as extension of AC only) | ACK |
| Pressurized gas cooler (as extension of AC only) | DGK |
| Single-side or crosswise twisted tubes | DRLL |
| Pool heat exchanger (free convection / no circulation) | Fa |
| Heat transfer and pressure drop in flow through tubes with internal longitudinal or spiral fins |
INLR |
| Pressure drop in multi-pass round shells | Lae |
| Recirculation of hot air in tube register heat exchangers | PLRE |
| Heat transfer and pressure drop for tubes with twisted inserts |
TWIS |
| Fan power consumption | VENT |
| Transient temperature distribution | ZELL trans |
| Miscellaneous | |
| Inspection documents for air coolers according to VDI 2049 | 2049 |
[1] Verfahrenstechnische Berechnungsmethoden, Part 1, VCH Weinheim
[2] LV Heat Atlas
