Joined on September 30, 2012
Last Post on June 26, 2014
@ March 15, 2014 5:49 PM in Delta p vs delta tYou mentioned saving ∆T pumps for larger zones. In this case, are you then controlling the pump directly with 0-10volt or utilizing a pulse width modulation approach?
@ March 15, 2014 3:59 PM in Delta p vs delta tWhat outputs the 2-10v? There is a thermostat that does this?
@ March 15, 2014 2:10 PM in Delta p vs delta tAre you creating your own proportional zone valves with CCVs somehow?
@ March 15, 2014 1:38 PM in system advicePeople use manifolds for rads all the time. It saves time and I don't think you'll save much cash assembling your own. I'm pretty sure you can get QS adapters for anything (definetly EK20) but the cost adds up when you need a bunch of them.
@ March 11, 2014 1:00 AM in Sizing a boiler in Watertown, MAOne thing to keep in mind, if your system contains a lot of water a smaller boiler won't be as responsive to thermostat changes. For example, if you like a night setback and expect to wake up and crank the thermostat, your boiler must first bring the system up to temp and that takes longer with a smaller boiler.
@ March 4, 2014 12:59 AM in geothermal vs. airsourcei wonder what the best way to configure such a system is. if the btu load is dominated by low temp radiant, one would hope for great cops. perhaps two storage tanks, one for each temperature, but then the question is how to control such a setup.
@ March 1, 2014 2:33 PM in Reducing mod/com output with multiple stage gas valve3400 btu minimum with 40 to 1 mod rate is excellent. combi boilers should make great use of this if the technology pans out.
@ February 25, 2014 12:35 AM in The best Delta T for a mod-con?i'm curious what impact unnecessary delta has on heat exchanger efficiency, assuming identical return temp.
a true counter flow, i would think, would be dependent on mainly return temp or modulation output as the primary variables governing boiler efficiency when the system is at equilibrium.
but a lot of these modcon heat exchangers don't look like counter flow. i would think, therefore, that such designs would suffer a more significant penalty from unnecessary high supply temp output, but i haven't seen any manufacturers' data that would suggest this to be true
@ February 23, 2014 8:10 PM in Help with Steam Efficiencythere is something horribly wrong if it takes 35 minutes to get heat at the closest radiator
are you sure the pressure is not going over 2psi
@ February 23, 2014 4:53 PM in Big problem with even heat distribution, please please help!why do the risers continue up through the ceiling
would a vent be behind the plaster, or would the vent be outside on the roof
@ February 23, 2014 2:22 PM in Big problem with even heat distribution, please please help!it looks like the riser is capped and ends before the ceiling --am i seeing that correctly
do you know when these problems began
@ February 23, 2014 1:57 PM in Big problem with even heat distribution, please please help!take a photo of the radiator, i think that would help people here determine the type of steam distribution employed
@ February 23, 2014 1:26 PM in geothermal vs. airsourcewhat type of system are you trying to heat --what temperature do you need at design conditions.
you can see from the charts that the cop drops off if one needs high system temps. i was surprised though, that the btu output doesnt drop too much. and i wonder how that compares to airsource.
@ February 22, 2014 6:40 PM in loud banging after oil->gas conversion can't sleepgreat idea. but where do those steam mains go. can you film the piping in the other parts of the basement.
@ February 22, 2014 11:45 AM in geothermal vs. airsourcehttp://www.waterfurnace.com/products.aspx?prd=502W12
click on the specification pdf
go to the section on performance data
might need to decipher a few acronyms
it seems like that table is for full capacity, though. i wish there was one at partial load. i also wonder how hard these sytems would be to integrate with wood.
@ February 21, 2014 8:07 PM in geothermal vs. airsourceAnd one thing occurs to me which is not specified in the EIA worksheet. I'm going to assume that their 'typical' efficiencies might be calculated with condensor temps around 140. am i right about that and how much do higher or lower design water temps affect the efficiency?
don't assume, pick a major company like waterfurnace and check the online docs. you will find tables that indicate cop is highly dependent.
@ February 21, 2014 6:39 PM in Uneven distribution of heatyou might want to post in the steam section and add some photos so people can determine what type of system it is.
@ February 21, 2014 3:14 PM in BEST WAY TO PIPE A 2 PIPE STEAM CONVERSION TO A 3 ZONE HOT WATERif the renter pays, then there is no direct incentive to improve the efficiency of the heating system or building envelope.
@ February 21, 2014 12:27 AM in BEST WAY TO PIPE A 2 PIPE STEAM CONVERSION TO A 3 ZONE HOT WATERwhy
that seems like such a waste, can't see any positives.
@ February 21, 2014 12:25 AM in BEST WAY TO PIPE A 2 PIPE STEAM CONVERSION TO A 3 ZONE HOT WATERsome rads are not good candidates for conversion because they are not connected accross the top. i dont think that was mentioned but seems pretty important.
@ February 21, 2014 12:20 AM in BEST WAY TO PIPE A 2 PIPE STEAM CONVERSION TO A 3 ZONE HOT WATERhow could the op efficiently zone the steam system
trvs cant call for heat
apologies for my failing keyboard
@ February 17, 2014 11:53 AM in Kickstart THIS!I'm looking back through the SelectTemp brochures. The technology seems so relevant to today. Is there a design/install manual out there somewhere?