[Equest-users] Boiler HIR and Section G3.1.1

r s ramyashivkumar at gmail.com
Tue Jul 2 08:27:19 PDT 2013

Hi Vamshi,

Just wondering, you say two buildings? Was there any MPR issue raised
within PIf1 in the review about having only one building per LEED submittal?


On Tue, Jul 2, 2013 at 11:04 AM, vamshi ranga <vamshiranga at gmail.com> wrote:

> Dear All,
> I have following doubts, I would be very grateful for your valuable time,
> 1. We have modeled a boiler with 82% *combustion efficiency* in eQUEST
> with HIR = 1.219  which is just the inverse of boiler efficiency . But from
> LEED reviewer, we got comment saying that, HIR of 1.219 is equivalent to
> 77% efficiency. Could you please let us know, how to convert combustion
> efficiency to HIR
> 2. We have two buildings, one is Main Office building (7 day week, 8hr
> running and Air-Conditioned, Main Office building has 5 to 7% of total two
> building areas) and the other is Factory+Office building (7 day week,
> Factory is 24 hr running and Air-Conditioned with 100% of occupancy,
> lighting and equipment on all the time. While the Factory's Office is 24hr
> running and Air-Conditioned with 50% of occupancy, lighting and equipment
> on all the time) which are connected by enclosed bridge (air conditioned).
> These buildings are modeled together in eQUEST and it comes to be System 7
> (Boiler for heating) as per Table G 3.1.1. After reading it for many number
> of times and to confirm my understanding of the section, doubts are as
> follows on ASHRAE Appendix G Section G3.1.1
>                 - What should be the system type for Main Office building
> (Conditioned area is around 45000 Sq ft)? and let me know the exception of
> G3.1.1 if any gets applied
>                 - What should be the system type for factory's Ground
> Floor Office building? (Area is around 150000 Sq ft) and Does the exception
> "Schedules that differ by 40 *equivalent *full load hours" gets applied?
> since the diversity is 50% for factory's office, if this exception is not
> applicable, let me know how the equivalent full load hours need to be
> calculated )
>                 - What should be the system type for Factory's First
> Floor office building? (This floor is total office, and ground floor
> factory area is of double height from ground)
>                 - Does the exceptions of Section G 3.1.1 applies at
> building level or at each system level? Exception "b" says both the things,
> so there is confusion
>                 - Does the term "Peak thermal loads" in exception "b"
> consider the load added due to outside air as well?
> Let me know, if you need any further clarification to resolve my doubts.
> Thanks,
> Vamshi.
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