On Tuesday, 5 December 2017 22:16:37 UTC, charles wrote:
In article ,
whisky-dave wrote:
On Tuesday, 5 December 2017 16:30:01 UTC, T i m wrote:
On Tue, 5 Dec 2017 07:35:02 -0800 (PST), whisky-dave
wrote:


It is a 700, 1300 or 2000W heater at 240V.

So how many would I need for either my office of the labs.
How many of the above heaters would I need ?

You need to determine the volume of the room, the starting temperature and
the final required temperature and how long you have to heat up the room.
From that data, YOU can determine the kilowatts required.

Yes I know, but did you know that the outside temerature varies from day-day and that the number of students numbers 100+ coming and going through swing doors will, also affect the temerature and that 100+ studetns working in the lab for 4 hours will result in a differnt temerature if there were half a dozen.
And that workman opening those doors and coming through the lab with rubble on wheel barrows is another vairiable, and through out most of teh day because the building can only be accessed by RFID cards that they won't give them to the builders that they leave the doors wedged open to the outside world so they can freely come and go.
even when the builders finsish around 3:30-4pm the doors were wedged open at 5:30pm when I left, but it could be the students doing it there's no way to tell.





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from KT24 in Surrey, England