[Equest-users] Large Heating Savings from Chilled Beams

[Sami, Vikram]

It possible. Reheat can be a really large load - I've seen labs where 50% of the energy usage was reheat (in Summer).

In most labs, the hot labs control the supply air temperature and the ventilation driven labs end up using a LOT of reheat energy. Chilled beams are really a strategy to reduce reheat loads by allowing you to reset your supply air temperature.

A good sanity check is to submeter the reheat coils. This is easier to do if its electric or attached to a campus steam/hot water system. If it's a boiler I would create a separate boiler for the reheat coils (just for diagnosis).

You could attach your inp file too.

Vikram Sami, LEED AP
Sustainable Design Analyst
1382 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com
Perkins+Will.  Ideas + buildings that honor the broader goals of society


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Fred Betz
Sent: Thursday, October 28, 2010 4:49 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Large Heating Savings from Chilled Beams

All,

I am getting unusually high heating energy savings, ~50%, when I apply chilled beams (induction units) to patient rooms in a hospital.

I just stumbled across another energy report written by another firm for a laboratory project of ours that shows the same results, ~50% heating energy savings when applying chilled beams.

The cooling and electricity savings are in line with what would be considered reasonable and I realize there should be some heating savings due to a reduced reheat load, but 50% seems excessive.

Both buildings have approximately 40% of the floor area using chilled beams.

The lab is in a cold climate, the hospital is in a more temperate climate.

Has anyone else come across this issue?

Thanks,

Fred


FRED BETZ  PhD., LEED AP
SUSTAINABLE SYSTEMS ANALYST

AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com  |  www.aeieng.com


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