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R: [EnergyPlus_Support] thermal mass versus insulation
Gents,
Thanks for your experiences, very interesting.
I have seen that speaking about comfort using thermal mass get better
radiant temperature: values are almost steady and closer to the best
temperatures (rather then in the light wall) during both summer and winter.
But about energy consumption what I have seen is that the light solution has
better performance in winter and the massive one during the summer.
(About the simulation: the wall is with heavy concrete and with good heat
capacity on the inside and insulation on the outside, the alternative wall
is completely made by insulation (kind of German Passive house), It is a
residential building, occupied during the day 7-9 16-23 during the week and
from 7 to 23 during the weekend, Internal gains are around 25Kwh/m2)
The heating system works with 20°C as winter set point and 26°C as summer
set point, the winter set back temperature is 16°C.
Natural ventilation has constant rate of 1ach.)
I am not understanding why, if both solutions have same transmission
properties, the insulated one works better during the winter. The question
is: could the massive wall absorb heat and release so slowly that at the end
more air delivered is required?
Thanks a lot!
Emanuele Naboni
+510.395.7241
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Da: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Per conto di
josep.sole@xxxxxxxxxxx
Inviato: Saturday, September 16, 2006 10:35 AM
A: EnergyPlus_Support@xxxxxxxxxxxxxxx
Oggetto: RE: [EnergyPlus_Support] thermal mass versus insulation
My experience is also: Thermal mass has a very small (not at all) influence
on a Energy consumption.
Increasing thermal mass o decreasing it has different effect depending
internal gains schedule, ventilation during day or night, occupation/
inoccupation schedule, night and day setpoint temperatures....
At the end the problem is not internal mass versus insulation.
In most of buildings thermal mass is placed on floor ceiling, internal
partitions and furniture,... facades have only a very small (neglectable)
contribution on it.
Josep Sole
URSA Iberica Aislantes SA
-----Mensaje original-----
De: EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com [mailto:EnergyPlus_Support@
<mailto:EnergyPlus_Support%40yahoogroups.com> yahoogroups.com] En nombre de
Miguel Angel Pascual
Enviado el: sábado, 16 de septiembre de 2006 16:11
Para: EnergyPlus_Support@yahoogroups. com
Asunto: Re: [EnergyPlus_Support] thermal mass versus insulation
Our experience is that intenal mass has an small impact on energy
consumption.
Internal mass can sligthly reduce heating Energy consumption in buildings
with high solar heat gains.
It is also possible to get a higher consumption in a more massive building,
if the heating system is off in the night. This is due to higher temperature
inside the building.
Here in spain architects use to think that internal mass is an effective
measure to save Energy,
But usually this is not reflected by simulations.
I hope it helps.
Miguel Angel pascual.
---
Miguel Angel Pascual Buisan
Sent via BlackBerry
-----Original Message-----
From: "Emanuele Naboni" <emanuele.naboni@
<mailto:emanuele.naboni%40gmail.com> gmail.com>
Date: Sat, 16 Sep 2006 00:48:29
To:EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
Subject: [EnergyPlus_Support] thermal mass versus insulation
Gents,
I am running a simulation to understand for a residential building located
in Milan if is better to have an envelope with thermal mass or a light wall
(similar to passive house wall). Both wall have the same K=0.4w/hm2 °C.
The light wall gives better Energy consuptions performance in winter
season, the thermal mass during the summer.
Is this a reasenable result?
Might it be that the thermal mass during the winter absorbe part of the heat
from the HVAC?
Thanks in advance to anyone has experience on the field!
Emanuele Naboni
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