[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [EnergyPlus_Support] Heating and Cooling vs. U-value
- To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
- Subject: RE: [EnergyPlus_Support] Heating and Cooling vs. U-value
- From: "James V Dirkes II, PE" <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 3 May 2011 20:34:18 -0400
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Tue, 03 May 2011 18:34:35 -0600
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=lima; t=1304469274; bh=Bry35dFQI5JEJvGKUDJVhSSQ3YIEyPZR+Iezxr1qBJ8=; h=Received:Received:X-Yahoo-Newman-Id:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:X-Received:X-EN-OrigOutIP:X-EN-IMPSID:X-Received:To:References:In-Reply-To:Message-ID:X-Mailer:Thread-Index:Content-Language:X-EN-UserInfo:X-EN-AuthUser:X-EN-OrigIP:X-EN-OrigHost:X-Originating-IP:From:X-Yahoo-Profile:Sender:MIME-Version:Mailing-List:Delivered-To:List-Id:Precedence:List-Unsubscribe:Date:Subject:Reply-To:X-Yahoo-Newman-Property:Content-Type; b=WQUYKe6HG2SJD3g5tllEmNZhc4Al8vp9ISNEgAEEFtAJGywO4pg2Fy8ngaMrW2wAsXOD/WhpsvCVxWOln4wUNH5TUS1TLoR3ZMBS52+Roybar+rO75ZxGYjlm6kDcr5v
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=O5SjN0x6QYVDDBB6pWtpviKg30RDX1s5FciSMQc4p0U87T5UW6e0Y6GXfNQisPXljZEk60d67nDrsqQw5RzmMohGHTCX9JhuFGGwC0BdSNvfdWXuTb2XzGG5w1FYJ6KM;
- Envelope-to: linda@xxxxxxxxxxxxxx
- In-reply-to: <BANLkTinah0N1rtdBaPDi4uMp7-ig=Fj6zw@mail.gmail.com>
- List-id: <EnergyPlus_Support.yahoogroups.com>
- List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>
- Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx
- References: <BANLkTinah0N1rtdBaPDi4uMp7-ig=Fj6zw@mail.gmail.com>
- Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Thread-index: AcwJ4xh9VWleTo2JS+mZ6WeYCjnhfAADkBCw
Dear Vinay,
There are indeed many variables!
Generally (probably always) more insulation in the envelope will reduce heating costs. The cooling costs are another question.
The big part of the question is whether most of the load comes from outdoors (sun and temperature) or indoors (lights and plug load). There?s also an influence from the schedules and diversity of the internal loads.
The building with a lot of internal load sources may see cooling costs increase with more insulation because one avenue for the internal loads to leave the building is the walls and the greater insulation prevents this.
So, I think you need to experiment a bit with your particular project, its internal loads and schedules, and the weather file.
p.s., As I recall Larry Spielvogel wrote an article discussing this in the ASDHRAE Journal probably 25 years ago. It was completely counterintuitive, but made perfect sense once he explained the logic.
Similarly, Steve Taylor and C. Hwakong Cheng wrote a recent article in the ASHRAE Journal (November 2010) about why enthalpy economizers are LESS effective than a simple dry bulb economizer. Perfectly counter-intuitive, but the rationale is unassailable. Check it out!
__._,_.___
Primary EnergyPlus support is found at:
<http://energyplus.helpserve.com>http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
<http://www.energyplus.gov>http://www.energyplus.gov
The group web site is:
<http://groups.yahoo.com/group/EnergyPlus_Support/>http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
<http://geo.yahoo.com/serv?s=97476590/grpId=3387488/grpspId=1705007389/msgId=20111/stime=1304469274>
Your email settings: Individual Email|Traditional
<http://groups.yahoo.com/group/EnergyPlus_Support/join;_ylc=X3oDMTJmOWE1bWkxBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA3N0bmdzBHN0aW1lAzEzMDQ0NjkyNzQ->Change settings via the Web (Yahoo! ID required)
Change settings via email: <mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx?subject=Email Delivery: Digest>Switch delivery to Daily Digest | Switch to Fully Featured
<http://groups.yahoo.com/group/EnergyPlus_Support;_ylc=X3oDMTJka2xnbThrBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA2hwZgRzdGltZQMxMzA0NDY5Mjc0>Visit Your Group | <http://docs.yahoo.com/info/terms/> Yahoo! Groups Terms of Use | <mailto:EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe> Unsubscribe
__,_._,___