controling different temps in different rooms / areas

[mattysupra]

Hi,

How can i control different temps in different areas automatically, im talking about radiators / blowers feed by water from a boiler.

What i want to do is this-

1- Warehouse i want to heat to 18c from 6am-4pm monday - friday, at weekend and night i want it to drop down to a minimum of 12c

2- Work Area - 21c from 9am-5pm monday - friday can be as low as 5c at night / weekend. But i also want to over ride it to stay at 5c if area not being used for weeks on end

3- Same as number 2 above (different area)

The heating system is not installed yet, would i be better of with 3 small boilers and thermostats or can i use one large boiler but something controlling when the hot water is allowed through to the rads?

For reference i think i need around a 70kw boiler to heat the 3 areas all together.

 

[calorific]

Am sure that some will advocate separate zone controls (three timers/stats) with one big boiler and three zone valves.

However, the "all eggs in one basket" is a concern

 

[mattysupra]

Am sure that some will advocate separate zone controls (three timers/stats) with one big boiler and three zone valves.

However, the "all eggs in one basket" is a concern

the concern being that if boiler breaks down i loose heating to all areas?

So these zone controls, do you have a link or a make of one maybe that i can have a look at and read about? Been trying to get quotes for new heating system but when im explaining what i want done im getting silence on the phone and being told it cant be done or they dont do heating systems like this etc.

 

[dcawkwell]

Depends how big the area is. Like how big the warehouse is.

A gas space heater may be suitable for a large warehouse.

Otherwise 2 boilers in cascade with zone valves for the 3 areas and 3 wall thermostats. A boiler failure won't matter as the second boiler
will cover. Both boilers will work in times of high demand.

Sorted.

 

[mattysupra]

Depends how big the area is. Like how big the warehouse is.

A gas space heater may be suitable for a large warehouse.

Otherwise 2 boilers in cascade with zone valves for the 3 areas and 3 wall thermostats. A boiler failure won't matter as the second boiler
will cover. Both boilers will work in times of high demand.

Sorted.

warehouse is small. It is 9m x 9m with a 3m ceiling height. Was thinking of using 2 x large domestic radiators in there or a small water / airblower with a 18kw output.

To give you a idea of what we are looking at.

Warehouse - 18kw air/water blower (well over powered but as i want stat controlled i presume not a issue? )
Work area - 18kw air/water blower
Work area 2 - 31kw air/water blower
70kw oil or lpg boiler

Total area to be heated including warehouse is 2304 cubic meters spread over 2 floors but all open and interlinking with large 3m x 3m openings between the 3 areas. Warehouse has doors to close off the opening.

EDIT- just found a link to similar blowers and spec - http://www.ebay.co.uk/itm/UNIT-BLOW...ling_Air&var=580155811936&hash=item416e0e92af

 

[calorific]

Regarding the control, something like this would allow different temps at different times to be programmed.

In simple terms this controls the zone valves which flicks a microswitch which turns the boiler on/off. It's a simple matter really, controlling a switched live

 

[Norcon]

Have a small single heater coil battery installed in my workshop.
Made by powrmatic.
The fan is held of by a pipe stat so that it doesn't blow cold air down the shop.
It will lift the shop to 12c with -2 out side which I'm happy with.
12c is a good temperature to work in. So its undersized with regard to space temperatures above that.

If your fitting air sensors as control I assume you will interlock the fans only and let the pump flow/boiler operation remain.
Thus when the fan starts again hot water is instantly available.
Or did you have other thoughts on control?