[Hap-users] Hap-users Digest, Vol 91, Issue 2

Mon Sep 11 08:00:42 PDT 2023

Thank you Diego,

I have revised the data and it is ok.

I think that, more likely, this may have something to do with the relative
sizes of the convective and radiative components and the way in which
radiative heat gains are distributed in the space.

According to EXCHANGE_8_2, from Carrier web page, the radiant component of
the lighting fixture output is stored in the thermal mass of the building,
to be released later over time by convection, while the convective component
of the lighting heat becomes an instantaneous space cooling load – see
Figure 3, recessed unvented fixtures - It highlights the difference between
heat gain and heat loads.

The heat gain occurs for a duration of, for instance, nine hours starting at
0700 and continuing through 1600 hs. The actual cooling loads are smaller
than the heat gains while the lights are on. This is because a large portion
of the heat gain is thermal radiation. This radiant heat is absorbed by the
mass  or the floor, walls and furnishings in the room, stores in the mass
and then released by convection to the room air where it then becomes a
cooling loads. This process causes a delay between the time a heat gain
occurs and the time its full effects as a cooling load.

The lighting we are modeling is "recessed unvented", and it shows the lowest
amount of direct heat gain to the space. During the first hour, 0700 of the
total heat gain, approximately 66 % becomes an instantaneous space load by
convection, while the remaining 34% of the heat gain is either convected
into the ceiling space above or into the room directly. The remaining load
is  radiant energy, which is stored in the room mass and released over time.
The cooling loads continue long after lights are turned off, at 1600 hs.
This is due to the radiant heat and the heat storage effects. When the
lights are turned off, some radiant heat from the previous nine hours is
still stored in the room mass and continues to be convected to the room air
over time.

This is why scheduled lights, where they are on for say 8-10 hours per day,
then off the remainder of the time, can result in more quantity of hours of
operation than the ones that were scheduled.

I would appreciate your opinion on the thoughts above.

Thank you,

Paula Hernández

Ingeniera Paula Andrea Hernández LEED  AP (BD +C) / Edge Expert & Auditor

Capitulo Argentino de ASHRAE 

Estudio Ingeniero Mario Pedro Hernández

Cel: 11 1559221377 (+54 9 1159221377)

Tel.: 11 1544712688 (+54 11 944712688)

Av. Montes de Oca 1103 5º D - C.A.B.A.

Web Site: www.mphingenieria.com.ar

e-mail: paulahernandez4 at fibertel.com.ar

-----Mensaje original-----
De: Hap-users [mailto:hap-users-bounces at lists.onebuilding.org] En nombre de
hap-users-request at lists.onebuilding.org
Enviado el: viernes, 18 de agosto de 2023 05:57 p.m.
Para: hap-users at lists.onebuilding.org
Asunto: Hap-users Digest, Vol 91, Issue 2

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Today's Topics:

   1. Re: Interior Lighting equivalent full load hours (Diego Escalona)

----------------------------------------------------------------------

Message: 1

Date: Sat, 19 Aug 2023 08:52:53 +1200

From: Diego Escalona < <mailto:descalonak at gmail.com> descalonak at gmail.com>

To: Paula A Hern?ndez < <mailto:paulahernandez4 at fibertel.com.ar>
paulahernandez4 at fibertel.com.ar>

Cc:  <mailto:hap-users at lists.onebuilding.org>
hap-users at lists.onebuilding.org

Subject: Re: [Hap-users] Interior Lighting equivalent full load hours

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Hi Paula,

you may have some spaces with other light schedules or other power. I
recommend that you check every single one in the report first to be sure of
that.

Cheers

On Sat, 19 Aug 2023, 7:56 am Paula A Hern?ndez via Hap-users, <
<mailto:hap-users at lists.onebuilding.org> hap-users at lists.onebuilding.org>
wrote:

> Hi,

> 

> 

> 

> I have recived the following comments from a Reviewer:

> 

> 

> 

> 

> 

> The schedule I have used is the 90.1 Office Interior Lighting, which 

> gives a total of 2688 hours per year in which interior lighting is on.

> 

> 

> 

> I cannot explain why this is happening, I would appreciate your 

> comments,

> 

> 

> 

> Thank you,

> 

> 

> 

> Paula

> 

> 

> 

> 

> 

> [image: Region XII Horizontal-small]

> 

> *Ingeniera Paula Andrea Hern?ndez LEED  AP (BD +C) / Edge Expert & 

> Auditor*

> 

> *Capitulo Argentino de ASHRAE *

> 

> 

> 

> Estudio Ingeniero Mario Pedro Hern?ndez

> 

> Cel: 11 1559221377 (+54 9 1159221377)

> 

> Tel./Fax: 4302-9561 Tel.: 4303-3481

> 

> Av. Montes de Oca 1103 5? D - C.A.B.A.

> 

> Web Site:  <http://www.mphingenieria.com.ar> www.mphingenieria.com.ar

> 

> e-mail:  <mailto:paulahernandez4 at fibertel.com.ar>
paulahernandez4 at fibertel.com.ar 

> < <mailto:mphingenieria at fibertel.com.ar> mphingenieria at fibertel.com.ar>

> 

> 

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