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2021-11-15 10:01:12 -0500 marked best answer Why is Site:WaterMainsTemperature Correlation from Weather File locked on one temperature for all times and locations?

I'm trying to use a Site:WaterMainsTemperature object to get a Correlation Site Water Mains Temperature output variable. Because I want my model to be flexible across sites, I set the Calculation field to CorrelationFromWeatherFile. When I run a test, however, I see that the output is locked at 3.33 degC. This value appears for every timestep and for disparate locations; Phoenix and Chicago TMY3 files return the same value, 3.33 degC. I even tried Chicago TMY2 in case it was some sort of epw file version issue, but still it returned 3.33 degC.

If I switch to the Correlation method and throw in some input values, I see the water mains temperature vary as expected, with a different temperature each day and different temperatures between sites.

The HTML table gives me a possible hint; the numbers it apparently calculates from the weather file are very small and again are the same value for Phoenix and Chicago. Phoenix HTML Table output

I haven't found any other questions about this except for this question regarding OpenStudio not having Correlation from Weather, but I'm working directly with EnergyPlus IDF editor, not OpenStudio.

Has anyone else had this issue? Is it a bug or am I just missing an object input somewhere to make this work correctly?

2021-11-15 10:01:12 -0500 received badge  Scholar (source)
2021-11-15 10:00:47 -0500 commented answer Why is Site:WaterMainsTemperature Correlation from Weather File locked on one temperature for all times and locations?

Thanks @shorowit for looking into it and filing that report. I'll keep an eye out for the fix and use Correlation inputs

2021-11-15 10:00:26 -0500 commented answer Why is Site:WaterMainsTemperature Correlation from Weather File locked on one temperature for all times and locations?

Thanks @shorowit for looking into it and filing that report. I'll keep an eye out for the fix and use 'Correlation' inpu

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