54 O People prefer higher temperatures and may seek out radiant heat sources, which promote intense differential temperature stresses, resulting in strong mechanical strains and increased rates of oxidation. The recognition that humans are more adaptable to uncomfortable climatic conditions than static objects due to their mobility and flexibility should be taken into account in relation to significant and vulnerable cultural heritage. Therefore, strategies for passive and low energy environmental control can be preferred for providing stable environmental conditions, which might not always match optimal conditions for human comfort. The main tasks are to identify aspects of the building construction which are beneficial for the environmental stabilization and to reduce and modify harmful factors [Pearson et al., 200017]. Summary of conservation requirements, objectives, and possible strategies General material parameters The Bakklandet warehouses are mainly wooden timber constructions, built on natural stone foundations, located close at and partly above the river. The foundations (basement) consist of a ring wall made of natural stone masonry, the river fronts are supported by inner and outer rows of massive wooden pillars. The timber constructions are characterized by a high frequency of vertical pillars for stabilization and closely staggered wooden boards around the walls and floors. The ceiling height is low, daylight can only enter most buildings through windows at the riverside and roadside (except warehouses situated next to open places). The buildings contain windows and wooden doors of different sizes and periods. Towards the river side there are large openings and wharves, which were used for loading goods. The roofs are a combined rafter and ridge roof, covered with slate or corrugated iron. Most of the warehouses are painted in different colours; most likely linseed oil was used as a binding agent [Troøyen, M.et al., 202218]5. 15 EN ISO 7730:2005: Ergonomics of the thermal environment - Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria , German version EN ISO, https://www.din.de/de/mitwirken/normenausschuesse/naerg/veroeffentlichungen/wdcbeuth:din21:89417255, accessed on 26.05.2022. 16 Pearson, C. / King, S.: Passive Environmental Control for Small Cultural Institutions in Australia, in: Australian Academic & Research Libraries, 31/2/2000, pp. 69-78, DOI: http://dx.doi.org/10.1080/00048623.2000.10755117, accessed on 26.05.2022, pp.73-74. 17 PEARSON / KING 2000, p. 74. 18 Troøyen, M. / Johnsen, E.G.: Kjøpmannsgata 27, unpublished Master Thesis, Department of Architecture, NTNUNorwegian University of Science and Technology, Trondheim 2022.
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