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SWEI

SWEI

Joined on November 26, 2011

Last Post on September 1, 2014

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also check out

@ April 4, 2013 11:01 PM in spacing

some of the Webstone Hydro-Core stuff http://www.webstonevalves.com/default.aspx?page=customer&file=customer/wecoin/customerpages/hydrocore.htm

proportional controls

@ April 4, 2013 10:42 PM in Pumping Awa Question

have 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.

ORC

@ April 4, 2013 10:26 PM in Pumping Awa Question

= Outdoor Reset Control

sizing tool

@ April 4, 2013 9:11 PM in Question on sizing flat plate heat exchangers

http://flatplateselect.com/ should prove helpful.

proportional control

@ April 4, 2013 9:08 PM in Pumping Awa Question

is 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 :)

giggles

@ April 4, 2013 8:58 PM in 4" Drop Headers make us giggle

Is that a 4 x 1-1/2"at the end of the header?  Wow -- you could serve peanuts in that thing.

Nice work.

Zone valves and ORC

@ April 4, 2013 5:09 PM in Pumping Awa Question

Conventional 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.

something lower

@ 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.

∆T and GPM

@ 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.

Lochinvar controls

@ 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.

6' at 3 GPM

@ 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.

required speed

@ 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...

How long has this been happening?

@ 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?

Where's the expansion tank?

@ March 31, 2013 4:34 PM in Flat plate install

Pump away from the tank and all should be well.

grid storage

@ March 31, 2013 12:07 PM in US shale gas to heat British homes within five years

using batteries still has a ways to go http://oilprice.com/Energy/Energy-General/Calculating-the-True-Carbon-Footprint-of-a-Renewable-Energy-Grid.html

not much difference

@ 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.

Can't click

@ 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.

can't reply to threads having titles that begin with punctuation marks

@ 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.

don't get me wrong

@ 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.

dump the primary/secondary

@ 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.

M. King Hubbert

@ March 30, 2013 9:06 PM in US shale gas to heat British homes within five years

Was 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.

US shale gas to heat British homes within five years

@ March 30, 2013 6:16 PM in US shale gas to heat British homes within five years

We 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?
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