John Siegenthaler
Contributor at PM Engineer
Articles
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1 week ago |
pmmag.com | John Siegenthaler
Air-to-water heat pumps are becoming increasingly common as primary heat sources in North American hydronic systems. This transition is likely to continue. As it does, some practitioners are learning - sometimes painfully - that heat pumps are not boilers. When boilers were paired with poorly matched balance-of-system design, it was common for installers to keep turning up the water temperature to compensate for poor heat transfer elsewhere in the system.
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2 weeks ago |
hpacmag.com | John Siegenthaler
I once heard a trainer tell some contractors that if they wanted the water in a hydronic heating system to follow the directional arrows on a schematic they had to draw arrows inside the pipe using a permanent marker. That way the water “sees” the arrows and knows what to do. Most of the audience understood this as a very humorous but absurd suggestion. It’s the ones that didn’t perceive it that way that need help.
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2 weeks ago |
pmmag.com | John Siegenthaler
Plumbing & Mechanical Engineer John Seigenthaler: Renewable Heating Design Last month, we discussed the use of hydronic heat pumps (air-to-water or water-to-water geothermal) for space heating, domestic water heating, cooling, and heat recovery ventilation. I presented a conceptual schematic for a system that could provide all four of these functions. It’s shown again in figure 1.
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1 month ago |
pmmag.com | John Siegenthaler
That’s got to be one of the most frequently-asked questions from potential customers who are convinced they want the benefits offered by modern hydronic heating, but at the same time don’t want to sweat it out in summer.
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1 month ago |
pmmag.com | John Siegenthaler
Radiant & HydronicsThe Glitch & The Fix I was recently sent a sketch for the system very similar to that shown in figure 1. When the system was operated the owner complained of flow problems. The heat emitters in any given zone were only marginally warmed when their associated zone circulator was operating. The owner questioned if another circulator should be installed in the area shown in figure 1.
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