Best Of
Re: Monoflow/Reverse Return Piping Question
the selling feature if monoflo was a sinhle pipe loop around the structure. It took some calculations to get the sizing correct
Im not sure that single pipe benefit offsets the other issues
As you can see this RR example takes more pipe/ insulation
PIC balance valves are another option for flow balancing, commonly used with air handlers and zone valves
Home-run is yet another option
More info here
https://www.caleffi.com/sites/default/files/media/external-file/Idronics_8_NA_Hydronic%20balancing.pdf
hot_rod
Re: What's a good humidity meter?
from Amazon
govee bluetooth works very well for $12.00. Battery lasted for several years.
SlamDunk
Re: Mixing valves in oil fired radiant floor heating system
A propane or natural gas condensing boiler can output low enough temp water to feed radiant directly. a cast iron boiler(weather it is gas or oil) can not. It would condense at low supply water temps which will destroy the cast iron. Condensing boilers have special heat exchanges that can handle the condensation. I thought Viessman used to have a condensing oil boiler but i'm not sure. Energy Kinetics also makes some higher efficiency conventional boilers for gas or oil.
mattmia2
Re: Radiant Floor Heating System – Is a 10°F Single Space - Same Zone Temperature Difference Acceptable?
If the contractor is no longer responding, have your lawyer send them a letter. That will usually grab their attention.
I'd like to know if they can safely raise the water temperature to heat that room properly. Is the boiler currently operating on outdoor reset or just running up to a set temperature?
How many square feet is that alcove? If it's on it's own, dedicated loop, install a thermostat in the room; wired or wireless. Easy.
Or get supplemental heat installed. A small radiator if you can get piping to and from that location. Or even an electric radiator. More difficult.
Change the doors and windows to a higher R-valve. Even more difficult.
Re-do the whole project. Tighter tube spacing. Very difficult.
Re: Radiant Floor Heating System – Is a 10°F Single Space - Same Zone Temperature Difference Acceptable?
Not sure about the law and I could see that being very messy and specific to contracts but I don't think it really matters. I can see no reason why, after completion, someone would not share this information with the owner if it were available. I design well over 100 radiant jobs each year and I rarely have any contact with the building owners, I let all my customers know that they should print a full size copy of the radiant plans and include them for the owner as part of the project along with a digital copy for future reference. As far as I'm concerned that info should always stay with the house, I'm very grateful for the plans and notes that were left from previous owners for my house (along with the box of breakers for my now obsolete panel!)
GGross
Re: New steam boiler - newbie help
With the fact that most steam heated buildings were sized with radiators that could heat the building to 85° on the coldest day of the year, with the windows open… There is a whole story about that… I believe that those old homes are much better insulated today, with new windows and other energy conserving measures added to lower fuel costs, you will find that the 30% factor built into that NET AHRI sq foot boiler rating is too conservative, so Paul has a point. The opposite direction may also apply if all the old asbestos insulation was removed from all the steam pipes, and no one has replaced that insulation. then a opinion for going up a size may have merit because you size a steam boiler to the attached radiation, not the building's heat loss. And since all those uninsulated steam pipes will be removing heat from the steam at a faster rate than an insulated pipe will, than you may need a bigger boiler.
The best advise is to make sure all the steam mains are insulated. and select the smaller boiler.
Re: New steam boiler - newbie help
Look for a steam boiler with a "Sq Ft of Steam" rating of 300-330. Always round down to the smaller boiler if you land between two of them. Others will disagree with me on this, no doubt.
Re: Mini Split Location
Don't put a 24000 in under any circumstances. You should be able to do 600 sq ft/ton12,000btu. What temperature are you expecting? If the 14,000 won't do it something is wrong unless you have no insulation.
Cathedral ceiling has little effect on the load as the space above your head stays unconditioned when on cooling. You really don't have a good spot to do this with one head. I would use 2 6000 btu or a 6 & an 8 if available. 2 tons for 600 square feet is crazy
Re: What's a good humidity meter?
Before I bought the electronic hygrometer I used to use an oven probe type thermometer with a piece of wet cord over the probe.
mattmia2
Re: Geothermal, one loop field, two air handlers
One thing to watch when you set up your pumps is the primary flow always needs to be above the flow of the two heat pumps. If the flow rate is too low, the heat pumps will pull some of their own return water into the supply without going through the geo loop which will reduce COP.
If those Alphas have IFCs, I'm wondering if it might be better to leave the purge valve closed between the closed spaced Ts to avoid this issue.
P.S. How dare you install a heat pump water heater, it should be a dual tank with a desuperheater! The HPWHs are expensive, unreliable and maintaince nightmares :) On a serious note, do watch how you set up the recirc on it, uncontrolled recirc will wear them out.
Kaos