[Bldg-sim] Energy efficieny: VRF + DOAS vs VRF + unconditioned Ventilation system

[Santiago Velez]

Thanks Andrew, I wonder though if besides first cost or maintenance related
issues there are any energy savings at all, and if so why is that the case.
I Read about better performance of evaporator running with lower air
temperature in a DOAS, but you still need energy to treat ventilation air
in the DOAS system, so were are the savings coming from?



On 21 July 2015 at 10:39, Andrew Corney <andrew.corney at sefaira.com> wrote:

> Hi Santiago,
>
> One benefit might be the ability to do the dehumidification remotely via
> the DOAS system. This could alleviate the maintenance of drip trays /
> condensate drains from your VRF fan coil units. You might also be able to
> down-spec the VRF fan coils that you are using as well (possibly reducing
> size).
>
> Another benefit would be that it might be cheaper to do a higher
> performance style of heat recovery centrally that could help reduce heating
> energy in particular.
>
> So there are 2 reasons!
>
> cheers,
>
> Andrew
>
> On Tue, Jul 21, 2015 at 2:33 PM, Santiago Velez <santiagogvelez at gmail.com>
> wrote:
>
>> Dear Group, Can someone enlighten me about the energy efficiency benefits
>> of conditioning the ventilation air in a VRF + DOAS system, versus letting
>> the VRF handle all the load (internal loads + Ventilation loads).
>> Thanks in advance.
>> Regards,
>> Santiago.
>>
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>
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