bodyheat or body heatMaybe You remember some personal experiences. For example the heat from 100 persons in a 50 m² room. It is like a 10 kW heating system.If You eat 2400 Wh or 2062 kcal or 8640000 Joule in 24 hoursthen Your body will produce 100 W in average. Maybe You remember some personal experiences. For example the heat from 100 persons in a 50 m² room. It is like a 10 kW heating system. That is enough to heat even a room without insulation. If You do not feel comfortable with 99 other people in a 50 m² room then You need an other heating system or a better insulation. W / (m . K) shows the quality of an Insulation material. Wm²K shows the quality of an insulation. Vacuum insulation is current state of the art at Insulation materials.
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