Mono Flow Tees and Donfoss Valves

[Deleted User]

We are bidding a job where a customer wants to reuse his
existing old steam radiators and convert these to hot water.
We would like to use mono flow tees with donfoss valves on
each coil. There are 17 radiators on the system.
Has anyone seen or installed systems like this? Any problems.

Ken_8

Sounds like an absolute

nightmare.

A heat load calculation is a must. Without it you could never know if the EDR output via steam can be met - or needs to be - by hot water (which is "short" on output).

The system pumping and Cv ratings, monoflow tee Cv factors coupled with the Danfoss TRV Cv ratings as well - and the size of the new return(s) will be a major calculation.

If you don't do the designs properly, you may have a tough time getting paid. This job will not be cheap. It can be done and we have done one or two. None recently. You must do the math.

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Mike K_2

Opps forgot to say we are running all new piping, only rad
are being reused.

TGO_54

piping

If you use a monoflow system you will have to compensate for the temp drop at the end if the loop. You may want to consider a two pipe radiatiator system instead. The supply temp will be the same to all of your radiators.

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Boilerpro_3

> nightmare.

>

> A heat load calculation is a must.

> Without it you could never know if the EDR output

> via steam can be met - or needs to be - by hot

> water (which is "short" on output).

>

> The system

> pumping and Cv ratings, monoflow tee Cv factors

> coupled with the Danfoss TRV Cv ratings as well -

> and the size of the new return(s) will be a major

> calculation.

>

> If you don't do the designs

> properly, you may have a tough time getting paid.

> This job will not be cheap. It can be done and

> we have done one or two. None recently. You

> must do the math.

>

> _A

> HREF="http://www.heatinghelp.com/getListed.cfm?id=

> 68&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

> "Find A Professional"_/A_

Boilerpro_3

As Ken said, you must do your homework

However,the output of hot water rads can be the same as steam rads if need be because the water temp can be run at 225F supply and 205 return (as long as the boiler is rated for it and you have proper system pressure) giving you an average rad temp of 215F, typically the same as steam. On the conversions I have worked on, this is typically not an issue. The highest temp one I have had is 180F average at design and the lowest was about 135F at design. Radiation capacity has never been a problem on the systems I've worked with.

Definitely check that the last radiator capacity in the loop because of the colder supply. The TRV's should balance things out if you have hot enough water.

There are lots of these steam to divertor tee conversions around here that were done in the 1960's and they work just fine.

But again, DO YOUR HOMEWORK!

Boilerpro