[Bldg-sim] Any clues? -- Ceiling Fans in South East Asia

Brahme, Rohini UTRC BrahmeR at utrc.utc.com
Fri Jun 26 06:07:24 PDT 2009


What this also brings out is the issue of adapting/updating the  standards and the back-end data to local/regional conditions. Is there any effort going on in India or other parts of the world that consider the local technology options and the comfort preferences while adopting the ASHRAE standards? This to me seems to be an important part of going towards low-energy buildings equation.

Thanks

-Rohini

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Vishnuraj Nair
Sent: Friday, June 26, 2009 5:29 AM
To: 'Cramer Silkworth'; bldg-sim at lists.onebuilding.org; leonard_sciarra at gensler.com; peter.simmonds at ibece.net
Cc: sanjay at kalpakrit.com
Subject: Re: [Bldg-sim] Any clues? -- Ceiling Fans in South East Asia

 

Thanks Cramer, Leonard, Peter and all for your valuable time.

 

I am replying on behalf of Neeraj.He will follow it up once he is back in town.

 

ASHARE 55 does give a bit of information about the thermal comfort in section 5.2.3.

However the section says that the elevated speed can be used to offset the temperature by not more than 30 C (5.40 F).

The air speed considered here is however in the range of 0.8 m/s to 1m/s. However the ceiling fans designed in here in India

gives an air speed of about 2m/s for which the temperature that could be offset can be more.

No specific relation as such is given as to determine the temperature that can be offset for higher air speeds.I have referred the 

Thermal Comfort chapter of the ASHRAE Fundamentals handbook,however no particular specifics is given as to relation between the

Air speed felt on the skin and the temperature that can be offset due to it. Definitely the personal comfort level also varies with person to person.

If anyone knows about any other standard or reference manual giving information on this matter or can throw more light on this it

will be greatly appreciated.

 

Meanwhile I have written to Mr. Dick Ainsley of Big Ass Fans as suggested by Peter. If he replies I will let you all know his response.

Thanks a lot again.

 

Regards.

Vishnuraj Nair

Kalpakrit Sustainable Environments Pvt. Ltd.  

New Delhi

Tel: +91.124.4309490-92 Ext: 312 , Fax: +91.124.4309493

E-mail : vishnu at kalpakrit.com <mailto:vishnu at kalpakrit.com> 

Disclaimer: The information contained in this message is confidential and may be legally privileged. The message is intended solely for the addressee(s). If you are not the intended recipient, you are hereby notified that any use, dissemination, or reproduction is strictly prohibited and may be unlawful. If you are not the intended recipient, please contact the sender by return e-mail and destroy all copies of the original message. The views expressed in this e-mail message (including any attachments) are those of the individual sender except where the sender expressly, and with authority, states them to be the views of Kalpakrit or its group companies and the same shall be subject to the terms and conditions in governing contract in writing, if any. Kalpakrit or its group companies have all authority to check all emails being exchanged using the above address.

 

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________________________________

From: Cramer Silkworth [mailto:silkworth at transsolar.com] 
Sent: Thursday, June 25, 2009 7:26 PM
To: bldg-sim at lists.onebuilding.org; near_ej at yahoo.com
Cc: sanjay at kalpakrit.com; vishnu at kalpakrit.com
Subject: RE: [Bldg-sim] Any clues? -- Ceiling Fans in South East Asia

 

Neeraj, 

  

Look into ASHRAE Standard 55, and also the ASHRAE Fundamentals Handbook. P. Ole Fanger's work is, well, the Standard. And I think Standard 55 is being updated soon, to better account for air motion effects. I think I saw something about this in the last issue of the ASHRAE Journal. 

  

http://www.ashrae.org/ 

  

-Cramer 

  

J. Cramer Silkworth 

Transsolar Inc. 

Technical consulting for energy efficiency and user comfort in buildings. Stuttgart - Munich - New York 

134 Spring Street Suite 601 

New York, NY 10012 

212-219-2255 

silkworth at transsolar.com 

 

________________________________

   From: \ [mailto:near_ej at yahoo.com] 
Sent: Thursday, June 25, 2009 6:14 AM
To: bldg-sim at lists.onebuilding.org
Cc: vishnu at kalpakrit.com; sanjay at kalpakrit.com
Subject: [Bldg-sim] Any clues? -- Ceiling Fans in South East Asia

Dear all,

Is there a (well documented) relationship between convective air flow against the skin versus the thermal comfort expectation lowered (theoretical deg. F raised for zone thermostat set-point)?

I am trying to ascertain the cooling benefit of low power high-speed ceiling fans that are prevalent in South-East Asia. They are especially useful in better air distribution and heat transfer from the skin of the occupants via convection. For modeling the strategy is going to be two fold -- [1] model the actual (low) fan power for the fans in each space considered, and [2] model a different (higher) thermostat set-point expectation since thermal comfort cannot be modeled in eQuest. Does this seem okay? -- Looking for peer validation.

Thanks in advance.

regards,
Neeraj

Neeraj Kapoor
t: +91.99581.70018
Kalpakrit Sustainable Environments Pvt. Ltd.
New Delhi, India




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