Energieffektivisering på Vista
Sweden has distinct seasons with cold winter and temperatures down to minus 25 ?C andpleasant summers with temperatures above 20 ?C. During spring and autumn there could becomechallenges with precipitation. The diverse climate in Sweden affects many homeowners. For thepeople living in leisure boats and permanent housing boats the seasonal changes are clearlyimpacting their economy and the indoor climate. During the winter the indoor climate can getextremely cold and humid, which affects the boats more vital parts and the standard of livingnegatively.The leisure boat, Vista, is 76 foot and was built 1938 in Orust with an oak rough. Vista has twoactively used rooms, the living room and one bedroom. In addition to these two rooms there arealso an engine room and room in the stern. Vista is in need of energy efficiency because of thehigh energy cost relative to the available living space. The heating cost today is around 1 400SEK/m2 and per year, this includes the kitchen area and the engine compartment of 38 m2. Thisreport will through thermo graphical and an analysis of Vista?s heating requirement, documentthe need for insulation and proposals for alternative efficient energy solutions that needs to bedone together with other alternatives for profitable energy efficiency.The measured value during the period from February 2012 to April 2012, confirm that Vista?smain energy challenge is to reduce the relative humidity. In order to improve this, a separatedehumidifier should be installed together with a mechanical ventilation system which isrecommended for all boats over 40 feet. Further improvements of the internal climate are tochange all the windows to triple-glazed as the current windows at deck are leaking. To get amore balanced and improved heat distribution as well as a more comfortable in-housetemperature and indoor climate, with less manual work, the owners should invest in a pelletstove. A pellet stove without a chimney can reduce the environmental pollution, which is highertoday because of the current woodstove.The results of the modeling indicate that by isolating just the floors and roof of the boat, theindoor temperature will reach 20 ?C. To accomplish an enhanced internal environment at Vistathe required investment will be 120 000 SEK. The investment includes a 10 cm thick isolation ofland discs consisting of Rockwool, a dehumidifier, a ventilation system, eight new triple-glazedwindows and window molding for two smaller windows and a pellet stove. None of thesemodifications will affect Vista?s historical presence and the electricity usage can be significantlyreduced as the heating radiators can be removed. The total cost per month with a 15 yearpayback plan is will be 8 000 SEK.