Drayton TRV4 numbers to temperatures

[mark.carline]

Does anyone know what actual temperatures in celcius the trv4 numbers are calibrated to roughly?

Aparently the perfect room temperature is 21c so i thought i would set all 8 of ours to what ever number 21c is ?

thanks

 

[chrishutt]

It doesn't really help to use exact temperature equivalents, since the air temperature sensed by the valve head is not necessarily the same as the air temperature sensed by you.

The best thing to do is to start off with them all at a mid position (3?), let the heating system run a while and the temperatures settle. Then if the room is then too warm, turn it down a tad, and if not warm enough, turn it up a tad.

 

[noonespecial]

Why do you state that the perfect temperature is 21 degC It depends on the individual, what they are wearing, what they are doing, whether they care about our environment, how much they can and want to spend of fuel, etc

You probably don't want all your rooms at 21 deg.C.

BS recommendations are 21 for lounge, dining study, 18 for bedrooms, hallway, kitchen, 22 for bath rooms and shower rooms.

But keep the rooms as cool as you feel able - that way you will not consume excessive energy and you will delay the inevitable when we become dependant on Russia

Also turn down or off rads in any rooms which are not in use when you are able eg bedrooms during the day. Better still get the controls which do this automatically.

 

[corgiman]

21 deg C is the industry standard for the calculation of heat loss noone

21 deg is the standard ambient temp inside and you calc this against 1deg c outside then you can calculate the heat loss

Dont ask me how its been eons since i have had to do it, sure chris can explain

so thats where he gets the idea that 21 is the "the perfect room temperature"

A little info but no where near enough

BTW if I am wrong please forgive me like I said I think John major was in charge the last time I had to calculate the heat loss within a domestic dwelling, rubbish aint I

as for the number on the TRV, my experiance tells me that they are about as accurite [sic] as analogue room stat, eg no at all, as noone says just find the setting that is comfy for you and stick to it

 

[noonespecial]

21 deg C is the industry standard for the calculation of heat loss noone

We all do things differently but BS5449 and the IOPHE Design Guide is in line with what I put down. Out of interest is 21 Deg C stated anywhere to your knowledge or is it what you were taught

 

[noonespecial]

think John major was in charge the last time I had to calculate the heat loss within a domestic dwelling

Thought it was the Muppetts who were in charge at that time and he was just one of them-don't think it is any different now

 

[corgiman]

true

 

[mark.carline]

ok thanks - I understand that they do need to be tuned to the right settings by hit and miss but I am sure that Draydon have a manual or somthing that shows what the exact temperature is for the numbers 1,2,3,4,5 ??????

Anyone have a direct link to thier site ?

With the rises is energy prices a number of companties that are now pushing 21c as an ideal room temperature. See the following links:

http://www.london-energy.com/showPage.do?name=homeenergy.priorityservices.coldMonthsSupport.til

"The ideal room temperature is around 21 C (70 F)"

http://www.velux.co.uk/Service/Condensation/The-ideal-room-temperature/

"A constant room temperature of 21°C and a relative atmospheric humidity of about 40% in the rooms provide healthy living conditions."

I do think alot of people say that their room "feels cold" or "feels warm" but I have noticed (in our office) that the room temperature is 21c but what changes is the relative humidity. On occasions when people have said its old the humidity has been 10% (temp of 21c) and when they said its too hot its been 55% (temp of 21c).

If anyones interested in knowing their room temperature and humidity, I have just picked up a couple of these of eBay:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=7749876592

 

[Agile]

You seem intent on ignoring the advice we are giving you.

How you feel depends on you and not the temperature. 21*C is a guideline and NOT a figure to set anything to.

Come back from jogging and 21*C feels very hot! Come in from the icebox and it feels warm but its still 21*C in both cases.

The lower you set it the less fuel. Why not put on warmer clothes and set it to 18*C.

There is NO exact correlation between room temperature and TRV setting. It all depends on layout, air movement and rad type and temperature. The TRV picks up heat from the rad.

Setting "3" is about 21*C in a typical installation.

Tony Glazier

 

[mark.carline]

You seem intent on ignoring the advice we are giving you.

Not at all - I just want my heating system set to the lowest setting to reduce costs & conserve energy.

How you feel depends on you and not the temperature. 21*C is a guideline and NOT a figure to set anything to. ome back from jogging and 21*C feels very hot! Come in from the icebox and it feels warm but its still 21*C in both cases. The lower you set it the less fuel.

I agree but my research has shown that the majority of people feel that 21c is the perfect room temperature and so anything higher than that is a waste.

There is NO exact correlation between room temperature and TRV setting. It all depends on layout, air movement and rad type and temperature. The TRV picks up heat from the rad.

Yes I know its not an an exact science but the manufacturer must give some approximate guidelines. There is alot of money and energy at stake here:

http://www.environ.org.uk/Energy/Save Energy Around The Home/

Turning your thermostat down by just one degree can cut as much as 10 per cent off your heating bills

Setting "3" is about 21*C in a typical installation.

Ok great thanks - At the moment they are all set to 4 and i have noticed that most of the rooms seem to average around 22/23 so 3.5 was my next step.
[/url]

 

[noonespecial]

Not at all - I just want my heating system set to the lowest setting to reduce costs & conserve energy.

Then you do not want it set throughout to 21 degC[/quote]

I agree but my research has shown that the majority of people feel that 21c is the perfect room temperature and so anything higher than that is a waste..

There is no perfect temperature. In swimming pools we design to 28 degC, in factories 16 or 18 deg C, in office 19 degC in the winter and 21 or 23 degC in the summer, elderly or infirm people may require a room temperature of 24/26/28 degC. There are so many factors which your research has not considered - air temperature, Resultant Temperature, Environmental Temperature, clothing factors, all things which you are probably totally unaware of - I suggest you leave the research for the Experts

Yes I know its not an an exact science but the manufacturer must give some approximate guidelines.

This is not the purpose of TRV's, if you want to control to particular temperatures then you use controls suitable for that purpose - and not TRV's

 

[bender]

I would think that TRV's undergo a temperature test at the factory, ie that at certain TRV settings they restrict the flow at given temperatures.

If these figures were available then that would give you a starting point, for a specific temperature, at which to set your TRV.

I personally start at the middle setting (click point on mine) and adjust from there.

 

[Agile]

Each of his rooms will be different!

His best bet is to turn them all to "2" and then increase them each day to establish the lowest setting which gives him the comfort required.

Tony

 

[ported]

Approximate values:
1 = 10C
2 = 15C
3 = 20C
4 = 25C
5 = 30C

 

[Agile]

Very good to make a first posting but you are not meant to add to posts from nearly two years ago.

In any case we were not telling him because he was approaching the situation from the wrong direction.

Tony