Greetings,
Regarding the Section 6.5.6.1 and specifically the exception 5., we’d like to ask for some clarification in case that more than 60% of the outdoor air heating energy has been provided.
1. The energy is provided from site-recovered energy. Does it mean that this could be a heat exchanger (plate or energy wheel type), which as part of the respective AHU is recovering energy from the exhaust air?
2. The energy is provided from site solar energy. Does it mean that such solar energy could be from photovoltaic panels, which save the fam power energy of the respective ventilation device.
Your support and comments are highly appreciated.
Thanks.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
April 30, 2023 - 11:39 am
1. Yes
2. More than 60% of the outdoor air heating energy must come from site solar to qualify for the exception. I would interpret this as a solar thermal source not PVs that offset fan energy. I suppose you could have electric resistance heat powered by PV but that is a rather inefficient way to do it. Maybe a heat pump powered by PV but that might have a hard time keeping up with the demand of heating outdoor air depending on the climate.
Vassil Vassilev
ManagerTermoservice
13 thumbs up
August 19, 2024 - 8:23 am
Greetings,
There is a clearing question regarding the same Section 6.5.6.1. and specifically, the table 6.5.6.1-1.
In case, our zone is 5A and the outdoor air is 100%, then for the Design Supply Fan Airflow Rate (L/s), it is shown >0.
How this should be interpreted, because it somehow provokes various suggestions.
Also, in this case should Baseline model have an energy recovery device.
Thanks in advance,
Vassil
Vassil Vassilev
ManagerTermoservice
13 thumbs up
August 24, 2024 - 3:00 am
Hi Marcus,
For the question case send in Aug.19, could you please provide me a simple reply - should the Baseline case be modeled with an energy recovered device ?
Your advice is highly appreciated.
Thanks.
Vassil
Tyler Thumma
7GroupLEEDuser Expert
67 thumbs up
September 5, 2024 - 8:29 am
For climate zone 5A, all systems with an outdoor air percentage greater than or equal to 80% are required to have energy recovery, unless exception(s) to 6.5.6.1 apply.
For the Baseline system, energy recovery would be required if the supply airflow and outdoor air percentage exceed the limits in Table 6.5.6.1-1. Since the Baseline outdoor airflow may be lower than the Proposed outdoor airflow, and the Baseline supply airflow is sized according to G3.1.2.9, it is possible for energy recovery to not be required for the Baseline system even though it may be required for the Proposed system.