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Developing a schema for ASHRAE Standard 229P.
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"Simplified" Method to Specify HeatRejection fan power #232

Open JacksonJ-KC opened 4 months ago

JacksonJ-KC commented 4 months ago

fan_electric_input_power was removed from the HeatRejection data group in addressing the Issue below. https://github.com/open229/ruleset-model-description-schema/issues/181

However, now there is no way to specify the full load fan power if it is known directly (no SIMPLE methods of specification like for Fan and Pump). For eQUEST there is no input associated with nameplate motor horsepower, nor brake horsepower/shaft power. Heat rejection fan power is only available as the full load input power, or as a ratio of input power to nominal heat rejection capacity.

JasonGlazer commented 1 month ago

@KarenWGard, since you prompted the changes in #181, would it be possible for you and @JacksonJ-KC to propose a solution that addresses all concerns?

KarenWGard commented 1 month ago

the data names were changed so that Heat rejection fan specification is consistent between Fan and HeatRejection.

The change from fan_electric_input_power to the new data elements were prompted by rule 22-17, which reads "The baseline heat rejection device shall have an efficiency of 38.2 gpm/hp"

In discussions with the group, especially Maria, we concluded that the "hp" in the equation is the fan_shaft_power

We could add HeatRejection.fan_design_electric_power to be consistent with the Fan data elements and nomenclature, but we would need a way to convert to fan_shaft_power in order to evaluate rule 22-17.

@JacksonJ-KC - thoughts on this?

JacksonJ-KC commented 4 weeks ago

HeatRejection.fan_design_electric_power would address the issue on my end. However, I disagree that the hp in 38.2 gpm/hp is referring to fan shaft power. The notes a, b, c, g in Table 6.8.1-7 all indicate that the denominator is referring to the fan motor nameplate hp. I do not see a reason to think that the units changed to shaft power for the 38.2 specification.

JacksonJ-KC commented 4 weeks ago

This would not help at all unfortunately with regards to rule 22-17... likely a step in the wrong direction if others agree that it is referring to nameplate hp. It may not be possible to evaluate in that case

claperle commented 3 weeks ago

I agree with Jackson that the hp is motor hp and not shaft power.

KarenWGard commented 3 weeks ago

Let's discuss this with the RDS workgroup next week.

On Thu, Jun 6, 2024 at 4:45 PM Jackson Jarboe @.***> wrote:

This would not help at all unfortunately with regards to rule 22-17... likely a step in the wrong direction if others agree that it is referring to nameplate hp. It may not be possible to evaluate in that case

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JacksonJ-KC commented 3 weeks ago

@JasonGlazer Conclusion is to add back the fan_design_electric_power data element to HeatRejection and Karen will update rule 22-17 and check for any other rules impacted.