On 05/12/2017 17:22, 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 teh above heaters would I need ?

42!

As a ball park in a solid wall Victorian village hall with 16kW of wall
mounted convection heaters on flat out in winter it can hold its own in
freezing conditions - but it takes an age to warm up the air near to the
floor. It never gets there on just convection heaters if a door is open
- in contrast to what happens when the warm air curtain is running. The
warm air fills down from the ceiling to the top of the door and then
escapes. Without the curtain heater it would take 4-6 hours to warm up
and the room would still be unpleasantly cold nearest the floor.

It warms up in under an hour if the 3kW curtain heater over the door is
on as well to start with. That is a space roughly 3x6x12m. The walls are
still cold and robbing heat but once the air in the room is warmed up
the building feels fine to the people in it. You do get condensation on
the still cold walls if there are a lot of people in dancing.

You can knock about 1kW of heating off for every 10 people in the room.
(ie it still needs 6kW of heating in winter with 100 people in)

--
Regards,
Martin Brown