Influence of sorption isotherm hysteresis effect on indoor climate and energy demand for heating

Jerzy Kwiatkowski , Monika Woloszyn , Jean-Jacques Roux


In order to investigate the effects of sorption isotherm hysteresis on indoor climate and energy demand, a new module for precise representation of mass transfer in materials in contact with indoor air, called Humi-mur, was developed and implemented in the energy performance simulation tool, TRNSYS. This extended whole-building HAM (Heat–Air–Moisture) simulation tool was then used to investigate the impact of the moisture-buffering effect on indoor conditions in a room. Two modelling approaches were compared: including/excluding moisture-buffering effect and including/excluding hysteresis in sorption isotherm. In addition, two ventilation strategies were used: constant airflow ventilation (CAV) and relative humidity sensitive ventilation (RHS). The simulation showed that for the CAV system, the use of moisture-buffering materials did not change energy demand but improved the indoor conditions. For the RHS ventilation system, the use of the buffering materials led to a higher energy demand, but the indoor relative humidity comfort was significantly improved. The results also showed that hysteresis of the sorption isotherm impacts on indoor conditions, even if the effect is smaller for the studied material than the average moisture-buffering effect.
Author Jerzy Kwiatkowski ZSCG
Jerzy Kwiatkowski,,
- Department of Power Engineering and Gas Heating Systems
, Monika Woloszyn
Monika Woloszyn,,
, Jean-Jacques Roux
Jean-Jacques Roux,,
Journal seriesApplied Thermal Engineering, ISSN 1359-4311
Issue year2011
Keywords in EnglishIndoor climate, Energy demand, Hysteresis in sorption isotherm
Languageen angielski
Score (nominal)35
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2011 = 2.064 (2) - 2011=2.389 (5)
Citation count*17 (2017-06-05)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.