Utredning av effektbehov för närvarostyrt klimatsystem i hotellrum : Jämförelse av induktionsapparaters och fläktkonvektorers effektivitet.

Sammanfattning: The aim of the study is to investigate whether induction devices can replace fan convectors, which is the climate system that is most common in hotel rooms today. The study compares the importance of the power of the two climate systems, induction devices and fan convectors, for use in hotel rooms. Climate systems controlled by presence require high power if room temperature is to be quickly regulated. The results show that fan convectors with power of 3000 W are often oversized for the hotel room, as the room being studied has a dimensioning cooling power requirement between 600 – 1700 W and heating power needs between 600 – 1000 W. Induction devices with a power of 1500 W are capable of meeting the cooling and heating needs if the room is appropriately designed according to its conditions, including sun protection and high window quality.    When the climate systems have been switched off during the absence period, the room has reached different temperatures depending on the design of the room. The time to cool or heat the room to the desired temperature, which is related to how hot or cold the room has been, differs between fan convectors and induction apparatus. High-power fan convectors have always been able to cool or heat the room in under 1.5 hours, while induction devices often can do it in a shorter time, except in cases where the power requirement is over 900 W.   What distinguishes the rooms studied is the placement of windows in different directions, the quality of the windows such as permeability, g-value and insulation ability, u-value, the rooms also have different thermal masses and sun shielding. The room that requires the highest heat output has a window with high g-value to get the most heat in during the winter months to reduce the power requirement, which turned out to have the opposite effect. When the permeability of light is high, it also contributes to more sunlight and heat being given to the room in the summer, therefore the cooling power requirement is also high for rooms with such a window.   To reduce the power requirement in an existing room, measures such as window replacement, additional insulation or sun protection change can be performed. The measures have different effects and can contribute up to 150 W lower power requirements, which means that both climate systems can be used in hotel rooms without problems.