[Equest-users] Need separate total consumption for different different zones served by same chiller

[David Eldridge]

The energy is by location of the primary equipment when referring to utility meters, so the chiller is located on one utility meter (as it will be in real life) and pulls kWh from there.

You need to use CHW metering to measure cooling energy consumed by one or more pieces of equipment. You can do this by looking at the AHU/FCU energy usage totals in the output reports, or if you can group several AHUs together on a separate loop of the CHW system you can monitor that loop in the same way. Note that this still won’t directly allocate kWh (neither would the real life system performing this function) but you can use the ratios of cooling consumed by residential and retail secondary equipment to allocate the primary chiller kWh.

Fans and other auxiliary electricity use should be totaled up per utility meter as you described for each AHU or FCU, just like they actually could be fed from certain panels billed to a separate meter and/or account in real life.

If there were zonal packaged systems such as heat pumps in each space then the metering system as described would work with each heat pump being assigned to a meter.

Likewise for heating the primary energy use of a boiler will be on one meter, but could be allocated in post-processing based on the usage of heating energy provided by the AHUs/FCUs or by making a dedicated loop to monitor as a group and use the ratio between residential and commercial to assign gas usage.

If the building had individual furnaces for instance then the metering approach would work.

DSE Mobile

> On Jul 9, 2019, at 2:10 AM, RiseUp via Equest-users <equest-users at lists.onebuilding.org> wrote:
> 
> Hi All,
> 
> i am modelling building which has residential + commercial areas.whereas single chiller is serving for both the areas. So i have created different utility meters for both the system as indicated below:
> <image.png><image.png>
> But After Simulation i am not able to find out separate consumption for cooling,Heating & space rejection.
> <image.png>
> So please help me out to find out separate consumption in every sector & to find out total consumption to calculate separate EPI for residential & commercial block.
> 
> Regards,
> Vishal
> 
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