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The calculation of general comfort is based on the Fanger theory for comfort. The class percentages get multiplied with a certain amount of satisfaction ratio, this way the weighted average is taken to calculate the general comfort. The satisfaction percentages for every class are:
Class 1: 95%
Class 2: 90%
Class 3: 80%
Class 4: 65%
If for instance, during 100% of the time the temperature is classified as class 2, the satisfaction rate of all the people in the zone is 90%. The weighted average equation with the above-mentioned example is as follows:
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In the example, the comfort class is 4 because of more than 1% of the time the temperature is classified as class 4. If the temperature is analysed, only at the start of a high setpoint the temperature is lower than 17°C and therefore in class 4.
To make sure the temperature is met at the start of a high setpoint, an economiser is often used. Every room controller in the Hysopt software has an economiser. The economiser analyses the behaviour of the room controller during the simulation and learns from those observations. When the configured setpoint is not reached at the desired time, the economiser will adapt so that over time the configured setpoint is reached at the correct moment. In the figure below the room temperature isn’t met at the beginning of the first high setpoint, but because of the economiser, it starts warming up the room earlier reaching the desired temperature just in time for the second high setpoint.
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The user should only activate the economiser in the software if the installed or planned thermostatic room controllers also have an economiser.
Investment
In the section “Investment” the NPV (Net Present Value), the payback and discounted payback, and the IRR (Internal Rate of Return). Because of the abundance of information on the internet about these calculations, it's not described in this Wiki.