Abstract
Under certain conditions, migration of small amounts of moisture
in the envelope of buildings can cause heat flow through permeable
thermal insulation materials due to the conversion of latent heat
when moisture evaporates from a warm surface, diffuses through the
insulation, and condenses on a colder surface. In these cases,
themagnitude of the latent heat flux can be of the same order as
the heat transfer by conduction. The latent heat transfer may
result in a heat gain which coincides with other gains of an
occupied building, and thus can cause an extra requirement for
cooling. The paper reviews and quantifies the importance of heat
flow processes in moist insulation systems. It then employs
modeling to analyze the effect of extra heat gain caused bylatent
heat transfer in the envelope on the thermal load on an office
building chosen asan example. An extra cooling requirement of 6-7
% is found.
| Original language | English |
|---|---|
| Journal | A S H R A E Transactions |
| Volume | 104 |
| Issue number | 2 |
| Pages (from-to) | 930-940 |
| ISSN | 0001-2505 |
| Publication status | Published - 1998 |
| Event | 1998 ASHRAE Annual Meeting, American Society of Heating, Refrigerating and Air-Conditioning Engineers - Toronto, Canada Duration: 19 Jun 1998 → 24 Jun 1998 |
Conference
| Conference | 1998 ASHRAE Annual Meeting, American Society of Heating, Refrigerating and Air-Conditioning Engineers |
|---|---|
| Country/Territory | Canada |
| City | Toronto |
| Period | 19/06/1998 → 24/06/1998 |