Joined on November 26, 2011
Last Post on September 1, 2014
@ April 4, 2013 11:01 PM in spacingsome of the Webstone Hydro-Core stuff http://www.webstonevalves.com/default.aspx?page=customer&file=customer/wecoin/customerpages/hydrocore.htm
@ April 4, 2013 10:42 PM in Pumping Awa Questionhave been around forever. Mechanical, pneumatic, analog electronic, and more.
Just seems a shame to be controlling all these newfangled modulating furnaces and boilers with on/off thermostats. Look at all the intelligence and innovation we're seeing in networked tstats -- that communicate with the system over a one-bit, one-quarter baud channel.
@ April 4, 2013 9:11 PM in Question on sizing flat plate heat exchangershttp://flatplateselect.com/ should prove helpful.
@ April 4, 2013 9:08 PM in Pumping Awa Questionis really the cat's meow for both comfort and efficiency. TRVs do a bang-up job for the average homeowner -- far better temperature regulation than most have ever experienced. I'm just trying to replicate that for a wall-mounted stat, which has a better location for both sensing temperature and occupant use.
I'm somewhat surprised at the lack of off-the-shelf proportional output tstats. Did I miss something, or are they somewhat rarer than hen's teeth?
Just starting to build momentum down here in NM, though I certainly appreciate the offer :)
@ April 4, 2013 8:58 PM in 4" Drop Headers make us giggleIs that a 4 x 1-1/2"at the end of the header? Wow -- you could serve peanuts in that thing.
@ April 4, 2013 5:09 PM in Pumping Awa QuestionConventional zone valves and bang-bang thermostats are not a good match for outdoor reset, except when used as high limit controllers. They are incapable of delivering the fine-grained control of individual space temperatures which occupants expect due to the small delta between fluid temp and space temp.
On commercial jobs, we use Belimo CCVs with 2-10V inputs and DDC, which gives us proportional control that works nicely with ORC. I'm still working on a residential package we can afford to support.
@ April 4, 2013 12:34 PM in Just Don't Get Modcon Boiler Pump Charts!is just "they way we've always done it" over here. When you combine that with a generous allowance for idiotic piping, you end up with the manufacturers recommending (or even supplying) pumps which are oversized in about 95% of the installs we see.
@ April 4, 2013 12:29 PM in Just Don't Get Modcon Boiler Pump Charts!are inexorably intertwined. If either is right, the other will also be. The boiler does not sense or monitor flow, so as long as you stay away from the ∆T alarm threshold it will be happy.
@ April 4, 2013 12:28 PM in Just Don't Get Modcon Boiler Pump Charts!Will deal with it, including pre- and post-purge cycles.
@ April 4, 2013 11:13 AM in Just Don't Get Modcon Boiler Pump Charts!Is a bit below the curve of a 006. Taco makes a 006-VVF4 which the Lochinvar could control via its 0-10V output.
Taco, how about some more pump end options for the HEC?
edit: While you're at it, give us a 0-10V input along with the internal controls.
@ April 4, 2013 10:28 AM in Just Don't Get Modcon Boiler Pump Charts!Varies with firing rate. What's your system head at 3 GPM? I'd probably be looking at an ecocirc e-Series for this.
In a perfect world, you'd use a properly sized ∆T-controlled circulator. A Taco HEC-2 (Bumble Bee) is oversized and would be operating at the edge of stability. I don't believe they make a VDT version of the 005.
We really do need some smaller smart circs...
@ April 3, 2013 10:16 AM in How often should the boiler limit switch be reached?Deep setbacks are generally not a good idea with radiant heat. Did you recently acquire the property?
@ March 31, 2013 4:34 PM in Flat plate installPump away from the tank and all should be well.
@ March 31, 2013 12:07 PM in US shale gas to heat British homes within five yearsusing batteries still has a ways to go http://oilprice.com/Energy/Energy-General/Calculating-the-True-Carbon-Footprint-of-a-Renewable-Energy-Grid.html
@ March 31, 2013 11:40 AM in Just Don't Get Modcon Boiler Pump Charts!I can see -- other than a tad more pumping energy with the lower ∆T. I aim for 30F with radiators when designing - we usually end up closer to 25F once the system is fully balanced.
@ March 31, 2013 11:02 AM in Just Don't Get Modcon Boiler Pump Charts!on the reply link to the right of the post if the title is ? or . or similar. No problem replying to other posts or the thread in general.
@ March 31, 2013 1:27 AM in Just Don't Get Modcon Boiler Pump Charts!Assumptions = ∆T in this case, on which both boiler and baseboard should be able to agree. I'd probably install a Bumble Bee and see what I could get.
@ March 31, 2013 1:11 AM in Just Don't Get Modcon Boiler Pump Charts!I'm a huge fan of direct-pumped firetube mod/cons. Just need to me absolutely certain that both source and sink are sized using one set of assumptions.
@ March 31, 2013 12:52 AM in Just Don't Get Modcon Boiler Pump Charts!only works if (a) the boiler HX can handle the required water flow and (b) the emitter system can lose heat fast enough. In the case of a water-tube mod/con HX paired with low-temp radiant floors a conflict usually arises.
@ March 30, 2013 9:06 PM in US shale gas to heat British homes within five yearsWas a geologist who did decades of research work at Shell. His projections were just about dead-on with regard to US production (a correction for hyperbolic versus parabolic curves eventually created a better fit.) The mainstream media and the general public continue to ignore the real meaning: Peak oil signals the end of _cheap_ oil, not the end of oil. What the industry faces are higher extraction costs, higher risks, and lower ERoEI.
Despite the temptation, I'm going to stay out of the political argument. I believe the facts speak for themselves with regard to domestic production of both oil and gas.
@ March 30, 2013 6:16 PM in US shale gas to heat British homes within five yearsWe knew this was coming http://www.guardian.co.uk/environment/2013/mar/25/us-shale-gas-british-homes-five-years
How many more deals like this will it take to get the wellhead price up to where they want it?