[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Supermarket refrigeration modeling - unexpected results
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Supermarket refrigeration modeling - unexpected results
- From: "tmrossi889" <rossi@xxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 26 Dec 2011 18:02:54 -0000
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 26 Dec 2011 11:03:00 -0700
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=lima; t=1324922579; bh=RZqJAwC9KM0WFruhI+3afevXd8jxXQWAqedwq/pCX4A=; h=Received:Received:Received:X-Yahoo-Newman-Id:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:To:Message-ID:User-Agent:X-Mailer:X-Originating-IP:X-eGroups-Msg-Info:X-Yahoo-Post-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:Content-Transfer-Encoding; b=h3PrSfn6xe/xa5kWAp77CqZBA4wJxSS2arQ8Zy6YPZfU0ZdggfSyjI/EXskiT0FEodiWOWMSdf6gSdU1nL2tJQgUs+wvThjyhh8hJ232EFy56qcllpaKQ5d3oaksjGvM
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=u7JhTzkGYcrG2Vajal4MwdepN7/edz0z075ZZJFpmCuq2FGxQMN1iQp3HnFok3avbWf6E4ad3XDAf9e5aSBmZ4b5Nr1GTBHhvHqTC3tjgAY059pT8RbmethIf8aRvlmr;
- Envelope-to: linda@xxxxxxxxxxxxxx
- 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
- Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx
- User-agent: eGroups-EW/0.82
We are using EnergyPlus 7.0 to model a supermarket with refrigeration. We started with an example input file and tweaked it to better represent the particular building we're interested in.
We are trying to use the model to predict the savings associated with mechanical subcooling, but found results that were lower than expected. We dug into it and found unexpected suction temperatures. With a mechanical subcooler, the suction temperature is always 0C for all time steps and for all liquid temperature setpoints. When the subcooler is removed, the suction temperature is 4C above the constant evaporating temperature (4C of superheat). This doesn't seem right to me and I suspect it explains the lower then expected energy savings.
Has anyone else noticed this or have an explanation?
Todd Rossi
Field Diagnostic Services, Inc.
215/359-3915
------------------------------------
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
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.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/