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Neuhaus, E and Schellen, H L (2007) Humidistat-controlled heating and ventilation systems to create preservation conditions in historic buildings in the Dutch climate. Proceedings of the 9th Clima World Congress Wellbeing Indoors, Helsinki Finland, 10-14 June 2007.

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In a marine temperate climate historic buildings that are equipped with thermostat-controlled heating systems show very low relative humidities (RH) during the heating season. This may lead to mechanical damage due to drying of hygroscopic materials like e.g. wood. Humidistat controlled systems are investigated using two different cases. Two top monuments of the Netherlands serve for the case study: Hunting Lodge St. Hubertus and Muiden Castle. The effectiveness of a humidistat-controlled heating system is investigated, both by simulation and by experiment. When using humidistat-controlled heating, the heating system is mainly used to maintain basic temperature levels during the heating season. During the humid seasons the heating system may be used to lower RH. Simulations are performed using Matlab Simulink. In the experimental setup a humidistat-controlled room is compared with a thermostat-controlled room. Simulation results show that humidistat-controlled heating is a good method to provide preservation conditions in historic buildings. Simulation results are validated by measurements. Though energy expenditure is significant lower, thermal comfort may decline. A humidistat-controlled ventilation system is investigated by making use of simulation. In historic buildings with high visitor numbers, high moisture and CO2-levels may occur. By selective ventilating with outdoor air, excessive moisture can be removed and low CO2-levels maintained. Preservation effects mainly occur by eliminating high RH by ventilating with air that has a lower specific humidity or by slightly heating the ventilation air. To maintain healthy environment conditions, control of the system on CO2-concentration is a priority.

Item Type: Article
Uncontrolled Keywords: Humidistat-controlled climate; Energy efficiency; Energy saving; Thermal comfort; Conservation heating; Simulation; Environmental monitoring
Subjects: English > Climate Control > Heating
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Depositing User: Anna Samuelsson
Date Deposited: 01 Apr 2008 12:21
Last Modified: 04 Apr 2017 10:21

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