I agree with Vaibhav. Long ago, 25-30 years or so, I believe Larry Spielvogel wrote an ASHRAE Journal article about this. The concept was called “optimum U value” (or something similar).
The impact of using more or less insulation varies with climate and internal loads, but it’s somewhat counter-intuitive; more insulation is not always better!
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Vaibhav Jain
Sent: Saturday, September 08, 2012 10:01 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Increased insulation run
Hi,
It might be because - when you have more insulation the heat from internal gains is trapped inside (due to high insulation) even during night time when outside is cooler. The opposite should be in case of low insulation.
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