|The more you understand the difference between Delta-T and Delta-P, the better you can serve your customers with the energy-saving components and systems that are right for their home - and their energy budget!|
System Design with Differential Temperature (Delta-T)North American residential system design is pegged to the temperature differential between the supply and return (Delta-T). It's part of the Universal Hydronics Formula, it's how we size boilers, select pipe size and determine the amount of radiation to put into a room. We also zone our systems and turn them on and off via a thermostat on the wall- all in an effort to deliver comfort.
Smart Delta-T CirculatorsIf we use a Delta-T based smart circulator in these North American systems, like the Taco Bumble Bee or 00-VDT, it reacts to how many zones are open, which zones are open, and even how cold it is outside, automatically - without an outdoor sensor. These infinitely variable speed Delta-T circulators deliver ONLY the BTU's required to match the actual heating load required by each zone. The entire system runs at peak efficiency, no matter the time of year, accurately providing optimum comfort and real electric and fuel dollar savings.
On the other hand, Delta-P ECM circulators operate best on constant circulation and utilize thermostatic radiator valves (TRV's), instead of thermostats, to control the flow to panel radiators. As the TRV's modulate open and closed, the pressure in the system changes and the Delta-P circulator speeds up and slows down to compensate for the change in pressure.
FloPro UniversityVariable Speed Pumping: Where to Use It, How to Use It, and Why to Use It.
The Universal Hydronics Formula