BIM Q&A | How to Create Aluminum Bars in Revit
I work in cold storage refrigeration and need to use aluminum bars. Can anyone advise on how to draw aluminum bars using Revit? I appreciate any help you can provide.
In refrigeration systems, aluminum row evaporators are preferred over steel pipes and air coolers due to their higher energy efficiency and longer lifespan. This makes them a popular choice.
So, how do you calculate the required surface area of aluminum rows for a cold storage facility? Here’s a breakdown:
- The surface area should be calculated based on the fin type, as different fin specifications have varying areas. Common fin types include:
– Φ 25 × 130 with two fins per meter: 0.29 m² (with internal teeth)
– Φ 25 × 150 with two fins per meter: 0.33 m²
– Φ 32 × 150 with two fins per meter: 0.34 m²
– Φ 32 with three fins per meter: 0.495 m² - The heat exchange capacity between fin tubes and air is approximately represented by the K value, generally around 8-10 W/m²·℃. A simplified calculation method is as follows:
When the refrigeration warehouse temperature is set at -18 ℃, multiply the displacement of the semi-hermetic compressor by a factor of 2 to estimate the required aluminum fin surface area.
For example, a 5-pack medium-low temperature compressor with a displacement of 18 m³/h requires: 18 m³/h × 2 = 36 m² of evaporation area.
Given a temperature difference of approximately 10 ℃ between the evaporator and the warehouse interior, this setup achieves an ideal energy-saving effect.
Note that adjusting the evaporation area affects the temperature difference: increasing the temperature difference decreases the compressor’s cooling capacity and increases power consumption.
The formulas and guidelines provided here for aluminum pipes in cold storage are intended for your reference.
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