Correction. The HX manufacturers are convinced that the effectiveness data provided are not reliable outside the range of 50%-130% of rated air flow. Providing better information for the model, either by manufacturers or other data sources, could allow a wider range of operation.
On 4/22/2011 7:48 AM, James V Dirkes II, PE wrote:
Dear Andrea,
The HX object is convinced that flows should never fall outside the 50-130% range. (I’m hoping that E+ improves this limitation in a future release, since it has caused me problems, too!) This calculation is based on the Air Loop flow at the HX. If you are using a constant volume system, this should be easy to fix; one or more of your flows do not agree / coincide.
If you have a VAV system or are using an economizer with variable outdoor air flow across the HX, you’re not going to avoid these errors. I don’t think the errors cause serious inaccuracies in the model, however, but I have not checked it in detail.<
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