An electrically heated cement floor covers an area of 100 mx 30 m. The surface tem- perature is 25°C and the ambient tempera- ture is 23°C. Approximately how much he is given off, in kilowatts? NOTE: from the point of view of heat radiation, cement is considered to be an insulator.

An electrically heated cement floor covers an area of 100 mx 30 m. The surface tem- perature is 25°C and the ambient tempera- ture is 23°C. Approximately how much he is given off, in kilowatts? NOTE: from the point of view of heat radiation, cement is considered to be an insulator.

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