"If you are concerned about environmental footprint, then they make no sense in the USA at all unless you are feeding them with PV or are on a grid dominated with renewable and/or hydro. On the standard US grid with an efficiency of 3.5 or worse,…"
"Just a follow up to Mark's post "cold waterlines in this space wont be exposed to outside humidity"
I am actually more worried about the indoor summer time humidity. Typical indoor conditions will be somewhere in the 50% -60% indoor humidity at…"
"Thanks for reply Mark - appreciate the follow up.
Most of the piping will be routed through interior walls, so the VB would not be present.
I am generally running continuous PEX lines from manifold to fixture stops, so will not have hidden joints. …"
"Realized the comment above did not make total sense. Of course our outside dew cycles has nothing to do with interior pipe insulation. But yes we do have pipe condensation issues. Cold water lines (incoming temp 40F-50F) are below the dewpoint of…"
"Hi David, Thanks for follow up.
It is becoming common to insulate the cold lines to prevent condensation now that most new construction turns basements into living space. We have a LOT of dew cycles in our climate (probably thousands a year), so…"
"Thanks Sean - I do not have 'wet walls' most places I will be installing the supply tubes. So definitely cannot drill holes larger enough to allow continuous insulation in the 2x4 sticks. And even a 2x6 would not be allowed by code to drill a 1.75"…"
"- if you mean circulators - yes of course they can be changed. No other motors beside outdoor heat pump.
- heat transfer plates get full? this is what heat exchanger plates are - no opportunity for them to 'get full'…"
"Lots of questions - some of the easiest ones first.
I am firmly in the camp of hydronic space conditioning vs forced air. It is more efficient from an energy standpoint and radiant heat beats convection heat any day in my books. It is also much…"
"condensation is always worse on north facing roofs in the northern hemisphere because those roofs do not see the sun and are cooler. Outdoor kitchen is probably more open than the barn meaning the metal roof has less chance to operate independently…"
"Perhaps if the person who built the barn and roof had even a basic understanding of building science or even barn building, they would have understood that this is common condition in open air barns with metal roofs and that some form of drip…"
"Just in case it is not clear - the heat pump graphic was the only one available in the software used to draw this. It will be refrigerant and not water connected between the outdoor heat pump and DX2W"
"Thanks for reply Sean.
Yes - I will also be cooling via the radiant panels. The cooled water will extract heat from the objects in the room. This is not common in residential but is used a lot in commercial spaces.
The water going to the ceiling…"