When comparing hydronic systems designs that are common in North America with typical European equivalents, comparisons reveal details that would be beneficial in either market, but are not “traditional” in one market or the other.
Figure 1 shows a hydronic system that’s intended to supply four panel radiators, each with their own thermostatic radiator valve and an indirect water heater from a gas-fired sectional cast-iron boiler. The system is designed using primary/secondary piping. The primary circulator operates whenever the space heating load or the indirect water heater call for heat.
Single-stage non-modulating heat sources in zoned distribution systems often face short cycling, particularly with low thermal mass. When few zones are active, they struggle to dissipate generated heat quickly, causing temperature build-up and potential shutdown of the heat pump based on internal limits, with varied restart behavior depending on controls.
A heating contractor is installing two air-to-water heat pumps as the primary heat source in a large home's hydronic system, keeping the existing boiler as backup. However, problems like heat migration into off zones and corrosion of the vent connector suggest design flaws that need to be addressed.
Keefer Rader of Outlaw Mechanical integrated hydronic heat pumps into a solar-powered home, using a dual-fuel system with U.S. Boiler Co.'s products to manage temperature needs and isolating oxygenated radiant loops with a heat exchanger, completing the retrofit in five days.
Control of variables and choice are key to manage a mechanical system for the life of a building.
May 13, 2021
The energy used in your building is a function of multiple variables; the structure and occupancy for example. Other variables center around component selection, control and design.
The acquisition of Slant/Fin baseboard assets brings together a major business component of two family-run companies who have always focused on consistently manufacturing and delivering superior quality, solutions-based hydronic heating equipment to residential and commercial customers across North America.
This course drills deep into the engineering aspects of tube length, tube center density, tube size and other factors affecting hydronic radiant heating systems.