RE: [EnergyPlus_Support] Insulating wooden floor raised 400mm from ground in temperate climates

HI, Dr. Ooi

There are lots of suggestion given by Jeremiah below. He is a PCM expert. Are you going to try any of them to satisfy your appetite for comfort/energy savings?

Dr. Li

To: ooi_kb3@xxxxxxxxxxx; EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jcrossett@xxxxxxxxxxxxxxx
Date: Fri, 16 Nov 2012 18:27:18 -0800
Subject: RE: [EnergyPlus_Support] Insulating wooden floor raised 400mm from ground in temperate climates

Closed cell spray foam with R value of 7.2 per inch, adding Resistance does very little after so apply about 8 inches. This will provide a tight air seal so to model it use AFN and reduce the surface crack CFM to near 0. If the foam is light in color set the solar absorbance to a realistically low value. (if exposed this will reduce heat gain from long wave solar radiation) Set the roughness to smooth. Use conductivity,specific heat and density of similar type of foam.(from HOF materials dataset) Spray foam applied to the exterior does not have thermal bridgeing, while inside applications require an assumed increase in conductivity. Use cost object and apply a bidded cost for construction. Based on fanger PPD, surface temperatures, energy savings, energy value and client appetite for comfort/energy savings and first cost adjust the insulation the thickness.

Sent from my Windows Phone

From: Ooi
Sent: 11/16/2012 3:43 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Insulating wooden floor raised 400mm from ground in temperate climates

i have a 12 m x 12 m single storey with wooden floor. This house is located 37.7 degrees south of the equator on the eastern side of a very big land mass. The temperature and wind varies widely, and this location is tooted to have 4 seasons in a day. Its getting expensive to maintain and operate a gas heater with ducts to the 6 compartments of this 54 yr old house.

The floor is raised 400-500mm above ground level. The house is of brick veneer and the bricks go down at least have a meter into the ground. Dr Li suggested 1 m insulation around the perimeter both horizontally and vertically. Since the air space below the floor is vented to the outdoor air which can go down to 5C in winter months, i doubt this is sufficient to make the occupants not having to wear socks or slippers.

i am also looking for economical floor insulation for a proposed 6.3m x 3.4 m nanny house separate to the above building. Any better suggestion than looking for cheap underfloor insulation/s?

All the best to everyone, ooi

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