Best Of
Re: Air Vent Requirement
On a one pipe steam system, vets on the main or the risers will determine how fast steam reaches a given radiator. The vent on the radiator will determine how long after steam gets there before the radiator is filled. Two different functions — but on most one pipe systems the runouts and risers do not have vents, and the radiator vent handles both functions, and that is perfectly fine if the radiator heats adequately along with the rest of the system. If a specific radiator gets steam much more slowly than desired, then a vent on the runout or riser can help
Re: What size pex tubing do you recommend?
For an ice melt system you would want 3/4" pex, 9" on center.
What size boiler do you have to run this?
Call; it 600 sq ft times 125- 150 BTU/ sq ft = 75- 90,000 btu/hr per bay
hot_rod
Re: any suggestions on pumps?
well you don't add the 2 head loss together assuming they are piped normally, if they are piped in series so one has to flow through the other first then your "furthest" zone via piping would just have a higher pressure drop (head)
So your first example with a 20 degree delta T you would size your pump for
(2 + 3.5) GPM @ 7' head (highest pressure drop)
5.5 GPM @ 7' Head
add a little fudge factor to that
6GPM @ 10' head = Alpha 15-58 even if you were to add the head this would fall within the curve so not sure where the issue is there
or for example 2 with a little fudge factor
10 GPM @ 25' head = Alpha 26-99
I would go with the 15-58 personally, especially if you are pumping each zone. If the 10 degree delta is very important then you would need a 26-99. feels a bit like overkill though.
GGross
Re: how to connect this steam radiator?
With any kind of luck, that means that the more or less horizontal runout under the floor isn't horizontal — that it's sloped back to the main, as it should be. That would be very nice…
And no, that is WAY too much out of line for a union to work. In fact, any alignment error is too much for a union.
However, there are ways… and the best is create a swing joint with two elbows at 90 degrees to each other (or one 90 and one 45) and a straight, rather than angle valve. With two elbows — I'd use street elbows — one can correct any amount of alignment error.
Re: Your thoughts and opinions please
it is a tough go to keep a crowd for more than 1/2 day, even with two breaks
Id pick 4 topics for a 1/2 day session, leaving time for discussion
hot_rod
Re: using pex tees in hydronic hot water heat system
The use of tees cannot be avoided unless the radiation is piped in a series loop which is only used for smaller jobs. Also with a series loop the baseboard footage installed needs to be adjusted because of the decreasing water temperature.
Sounds like you may have air trapped in some radiation or other issues.
Re: 1 Ton = 400 CFM??
I have adjusted away from the 100 CFM per 3000 BTU of cooling standard on many occasions. Most of my work was done in the southern tip of New Jersey. Cape May County is a peninsula at the southern most part of New Jersey that is surrounded by large bodies of water. The Atlantic Ocean to the east and south, and the Delaware Bay to the west. So the prevailing wind will often blow humid air from the evaporating waters around this area causing an unusually high amounts of relative humidity. The latent heat that must be removed from that air, in order to allow the sensible temperature to drop, often requires a slightly larger piece of equipment for the same exact home that may be located in the central and northern part of the state. This often sets the number at 80 CFM per 3000 BTU of cooling. or 100 CFM per 3750 BTU of cooling.
As @pecmsg so eloquently stated: "it's a starting point".
Do you know why 12,000 is called one ton of cooling?
Back when refrigeration was in the early stages it was determined that it took a certain amount of heat to melt one ton of ice (2000 lbs.) over a 24 hour period. That number was approximately 288,000 BTU. In order to get the BTU per hour, you would divide 288,000 by 24 Hours in order to come up with 12,000 BTU per hour. That number became the standard way to measure refrigeration equipment in 1903 or 1904. Only a few short months after Willis Carrier invented Air Conditioning.
Re: Another acquisition: ASC acquires Ward
They are quickly ruining the company.
