Heating in summer

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Hello,

I have an issue for my proposed design for my LEED model. It ends up using
a significant amount of gas for heating during the summer. However, the
baseline model is not using gas for heat during the summer. Does anyone
have an idea for why this might be?

Thanks,

*Mike Campbell, EIT, LEED AP O+M

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That, Sir, smells of reheating. Are you controlling your cooling coil so minimum reheat occurs?

John R. Aulbach, PE, CEM

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Mike,

Are you questioning why there's an increased amount of heating during the summer, or that
the heating is by gas?
If it's the latter, I took a very quick glance at your input file and noted that
HEAT-SOURCE=HOT-WATER, which means a BOILER that is heated by gas.

Joe

Joe Huang

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Which would likely result in a large boiler satisfying tea kettle summer loads with significant cycling and other standby losses.

Mike

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I didn't look at your file, but if it's a commercial building, you can
spend a lot of gas heating it at night in the summer, depending on the
weather. Check your schedules.

Robert Wichert P.Eng. LEED AP BD&C

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Need to review some of your inputs. The HW loop is set to STANDBY which
means the pump will run whenever a system fan is scheduled on and the
system's heating is available. Looking at your input, the HW loop is
always on as system fans are on 24/7 and heating is always available. The
PMZS units have gas furnaces with the cold deck control = RESET. The
default hot deck control is CONSTANT at 120F as input. PMZS has a default
minimum hot deck airflow of 1%. Each of these units is 100% outside air
24/7.

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I am questioning why there is ana increased amount of heating during the
summer.

*Mike Campbell, EIT, LEED AP O+M

*From:* Joe Huang [mailto:yjhuang at whiteboxtechnologies.com]
*Sent:* Tuesday, September 25, 2012 5:38 PM
*To:* Michael Campbell
*Cc:* equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Heating in summer

Mike,

Are you questioning why there's an increased amount of heating during the
summer, or that the heating is by gas?
If it's the latter, I took a very quick glance at your input file and noted
that HEAT-SOURCE=HOT-WATER, which means a BOILER that is heated by gas.

Joe

Joe Huang

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>From reviewing the SS-A report, I can see that the heating energy is being
used by the RTU furnaces. In my baseline model, these are modeled as PTACs
with hot water coil heat, with no heating energy mid-summer. Any ideas for
how to fix this?

*Mike Campbell, EIT, LEED AP O+M

*From:* Ron Pecarina [mailto:rp.esdc at gmail.com]
*Sent:* Tuesday, September 25, 2012 11:29 PM
*To:* Michael Campbell
*Cc:* equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Heating in summer

Need to review some of your inputs. The HW loop is set to STANDBY which
means the pump will run whenever a system fan is scheduled on and the
system's heating is available. Looking at your input, the HW loop is
always on as system fans are on 24/7 and heating is always available. The
PMZS units have gas furnaces with the cold deck control = RESET. The
default hot deck control is CONSTANT at 120F as input. PMZS has a default
minimum hot deck airflow of 1%. Each of these units is 100% outside air
24/7.

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