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open229 / ruleset-model-description-schema

Developing a schema for ASHRAE Standard 229P.
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Clarity for HeatRejection fan data elements #181

Closed KarenWGard closed 1 year ago

KarenWGard commented 1 year ago

The HeatRejection data group currently has two variables defining fan power:

fan_electric_input_power and fan_nameplate_power

however, it is unclear the difference between these two variables, and exactly what they mean. A text search for these two variables shows that they are not currently being used by the ruleset checking tool, so we can make clarifications to their meaning without undue repercussions.

This issue came to light while studying implementation of rule 22-17, which reads "The baseline heat rejection device shall have an efficiency of 38.2 gpm/hp"

In order to calculate the heat rejection device efficiency, @mkarpman suggests that we implement the following variables for heat rejection fans in exactly the same way they are used for the Fan data group:

                    fan_motor_nameplate_power
                    fan_shaft_power
                    fan_motor_efficiency
JasonGlazer commented 1 year ago

@KarenWGard can you suggest the date element names and notes language you would like to see.

KarenWGard commented 1 year ago

@JasonGlazer - per @mkarpman's suggestion, we use the same data element names as for the fan data group:

fan_shaft_power - Power delivered to the fan’s shaft and does not include the mechanical drive losses. Equivalent to fan brake horsepower for inch-pound units.

fan_motor_efficiency - Efficiency of the fan motor at rating conditions

fan_motor_nameplate_power - the fan motor horsepower at rating conditions

JasonGlazer commented 1 year ago

I presume these are replacing the existing fan_electric_input_power and fan_nameplate_power data elements, right?

KarenWGard commented 1 year ago

yes

On Thu, May 4, 2023 at 10:23 AM Jason Glazer @.***> wrote:

I presume these are replacing the existing fan_electric_input_power and fan_nameplate_power data elements, right?

— Reply to this email directly, view it on GitHub https://github.com/open229/ruleset-model-description-schema/issues/181#issuecomment-1534876542, or unsubscribe https://github.com/notifications/unsubscribe-auth/A3G3CLADITF4GQVPANGSXB3XEO3XPANCNFSM6AAAAAAW7MZ5F4 . You are receiving this because you were mentioned.Message ID: @.*** com>

JasonGlazer commented 1 year ago

Addressed in 0.0.28