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gennady

gennady

Joined on January 27, 2011

Last Post on April 13, 2014

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Delta t

@ April 13, 2014 8:59 AM in Multicirculator/Multizone

I would calculate loads for each zone, measure radiation, and decrease flow via increasing delta t. Usually radiation is oversized so you can go to delta t over 40-50F. Then balance zone to calculated delta T. It worked for me.

Venting

@ April 12, 2014 9:29 AM in Burnham Alpine

You can do it with boilers, just pipe within the chimney must be supported every 5 feet.

alpine 210

@ April 11, 2014 10:09 AM in Burnham Alpine

is it multi family building? 210.00btuhr?

Car analogy

@ April 9, 2014 10:14 PM in Mid range boilers

Boiler is just a part of system, so you comparing not cars but engines. What 2L engine is better, Audi or WW? I guess not much of a difference. What about the rest? You mention 2 zones. I guess , correct me if I wrong, you will be using 2 thermostats to stop and start flow trough the zones?

Midrange

@ April 9, 2014 9:09 AM in Mid range boilers

Midrange in what sense?

Steam vs hydronic

@ April 6, 2014 2:13 PM in Value of converting oil/steam to modcon gas?

If you have a steam system, you can have comfort and savings comparable to mod con hydronic. It is all about contractor not an equipment. Unqualified contractor will ruin any type of system, good contractor will make any system run well.

bad apple

@ March 14, 2014 1:34 PM in General steam trap question

The bad trap, failed in open position will turn off nearby traps and cause them to fail. It is like a bad apple.

another one

@ March 14, 2014 1:01 PM in Mod/Con Heat Exchanger Designs

you forgot to look at Inox-Radial heat exchanger

Correction

@ March 2, 2014 10:42 PM in New Gas Conversion

In order for boiler to condense you do not need water temperature below 130. Boiler can condense at 160F return water temperature. Also, when using outdoor reset, water supply temperature usually around 160F at average long island winter outdoor temperature.

Ocs

@ February 10, 2014 7:59 PM in CAST IRON RADIATORS

Anthony is a great guy and they sell first class product.

piping

@ January 26, 2014 9:49 PM in does this system look right?

This system is piped completely wrong.
-no point of no pressure change.
- boilers are piped in a way that their pumps are pumping into itself. i do not see system pumps
- differential pressure bypass is in wrong place.
and so on

whole thing looks like a joke

Heater

@ January 26, 2014 1:29 PM in rinnai hot water help

Sorry , I misread your question.

water heater

@ January 26, 2014 10:00 AM in rinnai hot water help

Water heaters are not boilers. They cannot be used as a boiler, Ask original installer to install real boiler.

piping

@ January 26, 2014 9:40 AM in Converting a 2 pipe radiator system to a 1 pipe or staying with 2 pipe- Any thoughts

I would definitely not recommend monoflo. No way. I would organize system into type of load, high temperature, medium temperature and low temperature, and pipe them with primary secondary, high first and low temperature last on the flow. I would do separate outdoor resets for each load. Also, you mention on measuring radiators to determine load. How do you know those radiators are sized properly? What was the name and qualifications of the person who designed and installed them? Just do proper heat loss and remember radiant system produce lower air temperature and generally requires probably 30% less input than convection system.

savings projections

@ January 19, 2014 10:40 PM in Calculating savings with degree days

I usually under estimate savings. Real life savings sometimes surprise me as well. There are more factors affecting savings other then just HDD calculations. And those factors are really impossible to predict. Main factor is ability of the boiler to follow load without overshooting. Proper set up of PID, where access is available, becomes essential. Another factors in modulating condensing boilers is avoiding boiler stopping and short cycling. Just my 2 cents.

Savings

@ January 19, 2014 6:51 PM in Calculating savings with degree days

In my understanding properly sized boiler will run non stop at design degree hour. So having heat loss done and knowing how much BTU is lost at these conditions, I multiply total hours of degree day per year. I get these at http://www.degreedays.net , then I get fuel usage per year based on those numbers. Then i deduct hot water fuel usage from customer bills, and get annual savings with new equipment.

design day water temperature

@ January 16, 2014 9:12 PM in New Lochinvar Knight Questions / Concerns

Radiators and baseboards are rated based on average water temperature. With delta T 20F, entering water temperature 160F, we have 150F AWT. with 180F entering WT we have 170F AWT. Looking at Governale gov-free radiator we see that btu per square foot of EDR will be 150 for 170F AWT and 110 for 150F. Now, there is a question if existing radiators will emit enough BTUs to cover heat loss at 160F entering water temperature. Also we have to consider that piping is not insulated and probably there never will be 160F at radiator.

Dankirk boiler

@ January 12, 2014 8:45 PM in Dunkirk boilers

We installed few of their boilers with no problems at all. Excellent product.

delta T

@ January 12, 2014 8:36 PM in Is envelope heat loss linear to inside/outside delta T?

Delta T is difference between 55F and outdoor temperature. 55F is design temperature of the envelope of the house. Heat is lost from envelope of the house to outdoor. But huge factor in heat loss are infiltrations. They might be larger than heat loss trough the envelope itself.

TRV

@ January 12, 2014 10:19 AM in Why not a zone for every room?

If you want to zone each room separately, you need to install TRVs on each radiator. steam or hot water does not matter. It is called indoor reset.

24 v

@ January 10, 2014 10:03 PM in Weil-Mclain Ultra 3 blows 3 amp and Limit Open error

you have a problem in low voltage section. 3 amp fuse is protector against short in low voltage circuits. disconnect low water cutoff and install original plug p12 or just check low water cut off harness on short and continuity. if harness is ok then check LWCO. you can jump its contacts if you can determine them. do not short power to low water cut off. Also those electronic low water cutoffs used by weil mclain need good ground. if protector is affecting the ground then LWCO will not work and will give you these messages. Check if boiler mechanical ground is connected to panel ground.

analyzer

@ December 22, 2013 4:30 PM in Recommendations for new flue gas analyzer- URGENT!

Testo is excellent analyzer
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