Moisture control of the indoor climate in Skokloster castle Rickard Eriksson Moisture control aims to reduce the risks associated with high relative humidity (RH) to avoid the emergence and growth of mold. In historic buildings with little or no demand for thermal comfort there are, to lower RH, mainly three active climate actions. These are heating, dehumidification and adaptive ventilation. The methods have been used in Skokloster castle (an unheated baroque castle between Uppsala and Stockholm) for three years to enable decision making of what climate control strategy that can prevent mold growth in a energy efficient way. Each action lasted for a year in three different case study rooms. To see the effect of the actions, three reference rooms with no actions were used. Temperature and RH was measured for all years and rooms. In the case study rooms energy use was registered. The result shows that the need for active climate control has been low, which can be shown by studying the energy use. The energy use is generally low for all actions and should not be crucial for the future choices. The result is in many ways difficult to interpret, but it shows that it would be too risky not to apply moisture control in Skokloster castle. An important conclusion is that it is largely the exceptions that have navigated the equipment and that the exceptions therefore should navigate the choice of the climate control strategy.

This thesis examines three medieval churches within Lagunda parish in Örsundsbro.The parish has previously had problems with mould growth and has therefore, inselected churches installed various types of moisture control, together with devicesfor measuring temperature, relative humidity and mixing ratio, at three locations inthe churches. The moisture control should in an energy efficient way reduce the riskof mould growth and thus reduce the future maintenance costs. The purpose of this thesis is to analyse the results and to see how the moisturecontrol measures has worked in the churches. The data has been collected in theprogram Omnisens and compiled by Magnus Wessberg at Uppsala University, whichresulted in diagrams that include relative humidity and mould risk, which theanalysis has been based on. Two different moisture control measures have beenused in the churches that this thesis examines. The measures are condensationdehumidifier and moisture controlled ventilation. The result is varying between the churches but shows that there has been a needfor moisture control that reduces the relative humidity indoors. The energy usagehas differed between the measures, but should not be crucial when deciding onfuture measures.The result also shows that the indoor climate is largely influencedby rainfall and that the church's organs in the study should be taken into account infuture measure, since the result when there is a risk of mould differs from otherparts of the churches. / Detta examensarbete undersöker tre medeltida kyrkor inomLagunda församling i Örsundsbro. Församlingen har tidigarehaft problem med mögelpåväxt och har därför i utvalda kyrkorinstallerat olika fuktstyrande åtgärder tillsammans medutrustning som mäter temperatur, relativ fuktighet och ångkvotpå tre platser i kyrkorna. Åtgärderna ska på ett energieffektivtsätt minska risken för påväxt av mögel och därmed minskaframtida kostnader för underhåll. Arbetet syftar till att analysera resultat av mätningarna och sehur de fuktstyrande åtgärderna fungerat i kyrkorna. Data harsamlats in i programmet Omnisens och har av MagnusWessberg på Uppsala universitet sammanställts vilket resulterati diagram där bland annat relativ fuktighet och mögelrisk kanutläsas som analysen sedan har utgått ifrån. I kyrkorna somundersöks i detta examensarbete har två olika fuktstyrandeåtgärder använts, kondensavfuktare och fuktstyrd ventilation. Resultatet är varierande mellan kyrkorna men visar på att detfunnits behov av fuktstyrande åtgärder som sänker den relativafuktigheten inomhus. Energiförbrukningen har skiljt sig mellanåtgärderna men bör inte vara avgörande vid val av framtidaåtgärd. Det visar även att inomhusklimatet i stor grad påverkasav nederbörd utomhus och att kyrkornas orglar i studien börbeaktas vid framtida åtgärder då resultatet när det finns risk förmögel där skiljer sig från andra delar i kyrkorna.

Churches are old historical buildings often built of stone that carry a heritagethat is important to preserve for the future. It’s common that churches haveproblems with high relative humidity which also causes mold growth. Moldspores are found naturally in the air but require good conditions, such as highhumidity, materials to adhere to and a favorable temperature, to start growing.Attempts have been made to reduce the humidity in churches with varioushumidity-limiting methods. The purpose of this study is to investigate whetherclimate control methods can prevent the growth of church mold and control therelative humidity so that the results can provide guidelines for other churcheswith the same problems. Nine churches in north Gotland's pastorate have been used in the study. In threeof these, textile cabinets were installed in the sacristy for three different climatecontrol methods: humidity-controlled dehumidification, mechanical exhaustventilation and humidity-controlled heating element. These were measured overan eight-month period with a data logger that measured the relative humidityand temperature once every half an hour. Measurements were also taken fromthe respective sacristy. For the other six churches, measurements were taken bythe organ during a 12-month period with the same data logger. Then a moisturecontrolled dehumidifier was installed in only three of the churches in the middleof the church room. The relative humidity and temperature were measured onceagain in all six churches for the next eight months. The results from this study show that in the three churches where moisturecontrolled dehumidification was installed, the measured values were slightlybetter for both relative humidity and the risk of developing mold. In the textilecabinets, on the other hand, the values for both relative humidity and the riskof mold were slightly higher than in those for the respective sacristy. However,the values were somewhat more stable which is a good thing. The need to regulate the climate of churches will not decrease. Finding costeffective solutions for controlling the indoor climate is therefore important forpreserving their cultural-historical heritage.