[Hap-users] High Electrical Heating Consumption in March - VRF System

[Nitish Poonia]

Hi,
Try switching off the cooling schedule during March...looks like
simultaneous cooling and heating happening.
Thanks
Nitish
On Sep 11, 2015 12:46 AM, "Eric Rivera" <erivera at smithboucher.com> wrote:

> Hello All,
>
>
>
> I’m working on an energy model for a controls rebate for an office
> building in Kansas City, where I am comparing a VRF system with a DOAS with
> constant ventilation and a thermostat with 24/7 occupancy, to  a similar
> VRF system with DCV and ASHRAE 90.1 standard office thermostat.
>
>
>
> The DOAS for both models have an air-cooled DX coil with a setpoint of 70
> F and a natural gas fired heating coil with a setpoint of 75°F. The
> terminal units are modeled with an air cooled DX coil with a design supply
> temp of 58°F and a heat pump with design supply temp of 95°F. Both systems
> model sensible and latent heat reclaim.
>
>
>
> I would assume that under the option with controls, during the winter
> months, the DOAS would heat the building during scheduled occupied hours.
> Once the system goes in unoccupied mode, the terminal units would heat the
> space to the unoccupied setpoint.  What is weird is that electrical heating
> consumption is highest in March (See attached for a building summary
> report).  After reviewing the detailed hourly system reports, I’m still not
> able to figure out what would be causing a high heating load in March. My
> guess would be something to do the heat reclaim. My question is:
>
>
>
> What, within the heat reclaim, be causing the electrical heating demand in
> March to be so high?
>
>
>
> Any help would be appreciated,
>
>
>
> Thanks,
>
>
>
>
>
> [image: cid:image001.jpg at 01CCAE92.6FC59620]
>
>
>
> *Eric Rivera*
>
> 25501 west valley parkway
>
> olathe ks 66061
>
> direct: 913.344.0036
>
> main: 913 345.2127
>
> fax: 913 345.0617
>
>
>
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