Joined on March 4, 2009
Last Post on June 19, 2013
@ February 8, 2013 12:25 PM in MONOFLOW GPMIt pays to wander off the Wall. ;-)
@ February 8, 2013 11:58 AM in MONOFLOW GPMThis is from the Library: http://www.heatinghelp.com/files/articles/955/281.pdf
Read up on it before you do anything else.
@ February 8, 2013 11:23 AM in Happy Birthday CIPH!What a great organization. Some of the nicest people I've ever met. Well done, eh!
@ February 7, 2013 9:03 PM in Sharpe and New SystemAnd smile when I think about the next guy who shows up. Huh?
Life's too short not to be giggling.
@ February 7, 2013 4:23 PM in hot water loop off steam boilerthat will give you a lot more info: http://bit.ly/WROR3q
Gravity circulation is convection. The water in the steam boiler is very hot and it will rise from the boiler into the hot water zone by convection unless there's something in its way to stop it. The flow-control valves do just that.
The blending is about the temperature of the water as well. When you're making steam, the temperature of the water in the boiler is about 215 degrees. If you were to pump that up into a hot water zone there's a good chance that the water will flash back into steam when the circulator shuts off. This isn't a pressurized system and that's why that can happen. By blending some of the water returning from the zone into the super-hot boiler water you can lower the supply temperature to the zone to 180 degrees, removing the possibility of steam flash when the circulator stops.
That link will explain further. Good questions! Thanks.
@ February 7, 2013 2:08 PM in hot water loop off steam boilerAre there to stop gravity circulation into the hot-water zone when it's not calling. It can migrate from either end, and that's why there are two.
The line between the two is probably a bypass for blending, but I'm not sure which pic you're looking at.
Thanks for reading me.
@ February 6, 2013 1:47 PM in Ray Wohlfarth seminar online, February 6.Ray is amazing in a boiler room.
@ February 6, 2013 12:21 PM in One of our industry's best managers is available.His enthusiasm. He grabs the world by the balls and gives it a squeeze every day of his life.
@ February 6, 2013 12:18 PM in disappearing postI do that from time to time. Thanks.
@ February 5, 2013 2:30 PM in I'm posting this for Bill Brooks.I use a quietside qmv-9 mod condensing boiler with an output of 55kbtuh-115kbtuh. The boiler has 2 distinct hx, one for the indirect dhw, the other for my radiant heat which currently fires 3 zones.
The main lv. Area, garage, mer/shop. Heat loss was calc. using rfh warmsource 2.08a. and results in 48.5kbthu for the house.
Main lv.area =14.25kbthu, garage=10.7kbthu, mer/shop=7.7kbtuh. I suffered from short-cycling, so 3yrs. Ago I installed a 40gal. buffer tank which increased firing rates to well over 10min. I have no issues with this decision.
first 2 winters were typical with several design days. At 2deg, the
main area was 67-68deg. As predicted. The stat (lux pro air sensing) works ok but not overly speedy. Last winter was very mild but nevertheless without complaint. All was good.
summer the flow sw. sensing call for heat by the dhw failed and allowed
copious amounts of water and (glug,glug-air) to invade the boiler
interior piping before I could get things isolated. Needless to say,
the whole radiant system was pretty well drained with tons of air.
I chose to do a power purge of the main lv.area first since its supply
and return manifolds are below floor level. I am using rehau Pro
balance manifolds with stop-cocks on the return. These units can be
completely isolated from the rest of the system and purge each loop independently
from the other. By connecting a hose to the return manifold and
immersing it in a partially filled pail of water I was able to
watch for air as it was moved out. I pressurized the circulator header
and valved off the other circulators so that I would get a complete purge
thru this entire circuit only. All of the loops had gobs of air and
took a while to get everything out (so I thought). I opted to do
nothing with the
other zones until cold weather as their supply and return manifolds are
above floor level and easier to move out the air if necessary. Turns out they’re ok anyway.
weather got cold I was surprised to note the main lv. Area stat took
forever to get satisfied, in some instances firing all nite. I did not want
to fool with the plant going into winter so I chose to monitor all
zones, measuring temps. And looking at floor temps. Also observe the performance
of the plant in general. Using a snap-on pipe thermometer as an
indicator, I noted the buffer tank discharge as 120deg.most of the
the garage and mer/shop zones were always satisfied with very short
firing periods needed. The main lv. Area is heated by ½’pex supplied by
to the boiler. Porcelain tile covers 1 ½’ liteweight maxon concrete.
During firing periods I measured 70-72deg. Floor temps which are
than previous years. Also the space feels noticeably drafty. I had to
run the gas logs most of the day to cut the chill and even had to call
up the a/c airhandler (on its own stat) with electric strip heat inside when it was below 20deg. ABSOLUTELY UNHEARD OF!
boiler and buffer tank appeared in order with discharge temps. Usually
around 120deg. I decided to check temps. Further down the line to see what
temps. Were actually being sent to the main lv. Area zone. Between the
buffer tank discharge and this zone’s circulator is roughly 5’of ¾’
a Honeywell supervent in between. HORROR OF HORRORS I measured
typically 80-85deg. Going to the floor and sometimes as cool as only
is causing this temp. drop of 40deg. Before it even gets to the
floor?? Is the supervent clogged causing a temp/pressure drop, or is
slug of air lurking in the circulator headers? Also I am not using
outdoor reset and the circulators are not modulating type.
want to restate that the plant has never suffered problems in the past
until this air situation. In the past even in bitterly cold weather
walking in bare feet
was always very comfortable! I’ve been trying to think this thru
without outside assistance. The smile has long since left my face!
I’ve enclosed 3 photos which hopefully get transmitted and clarify the plant layout:
the top piping of the buffer tank. The 2 pipes toward the back are the
main radiant zone returns mixing with the heated water from the boiler.
The pipe in the foreground is the heated buffer water going to the circulator header. The boiler directly fires the buffer.
2. Shows the relationship of the circulator header to the boiler piping. (note supervent)
with the remainder of the piping relationship to the dhw,etc. the
direct firing of the dhw and buffer are seen in this pic.
Any thoughts or suggestions would be greatly appreciated.
@ February 5, 2013 10:44 AM in Heritage on an English buildingSent to me by a friend in Liverpool.
@ February 1, 2013 3:39 PM in One of our industry's best managers is available.more of the same. Whoever gets him will be more successful. Bob has so much experience and understanding of this business. I hold him in the highest regard.
@ February 1, 2013 10:11 AM in One of our industry's best managers is available.I've known Bob Muser for most of my career and they really get no better than he is. Check out his resume.
@ February 1, 2013 7:31 AM in Happy birthday, Dan Holohan!Erin does the Thursday e-newsletter. I'm lost without her. She's my favorite (our secret!).
@ February 1, 2013 7:29 AM in Happy birthday, Dan Holohan!63. I'm enjoying these Sixties s much as the last Sixties. ;-)
Thanks for all the good wishes. I had a wonderful birthday. I flew to Dallas for AHR. My son-in-law, John, who is an engineer for the State Department (embassies need special HVAC systems) picked me up at the airport and bought me a steak dinner. I love that guy.
AHR was huge, as always. Great to see everyone. Thanks.
@ January 31, 2013 2:00 PM in Moving Threads?I have to do that from my end, and I often do if I think the question might get a better response in another section. If you (or anyone else) see a question that you'd liked moved, just email me and I'll take care of it. firstname.lastname@example.org. Thanks.
@ January 28, 2013 11:44 AM in A new sectionInspired by a fine conversation with my friend Mark Eatherton
@ January 27, 2013 7:54 AM in Happy birthday, Dan Holohan!If I knew I was going to live this long I would have taken better care of myself.
@ January 26, 2013 3:30 PM in some of the dead men showing offNote how the installing company got their name on the boiler. That's a nice thing that manufacturers used to do. I'll bet it built great brand loyalty.
Note, too, how the journeymen wore hats and the apprentices wore caps.