Renaine circulation plus#

However, as the room temperature is satisfied wouldn’t it make sense to slow the circulator down and modulate its flow based on room load? This makes it dynamic. Indeed, if this single zone did not see any load change it would be static.

This is also know as zoning with circulators. If there was one boiler with a modulating gas valve, to maintain a specific T or to control the return water temperature, the flow would have to be modulated with the firing rate of the boiler – hence this is a dynamic, variable flow application. The piping system that moves Btus from the boiler(s) between the boiler loop supply and return would only be a static, constant flow application if there was only one on/off boiler on this loop. I have been questioned about two applications that might not be dynamic – boiler primary and individual pumped zones. Flows change as heating or cooling loads change, a function of the laws of thermodynamics (Btus are affected by T and circulated pounds of water or US GPM). Hydronic heating or cooling systems are 99.9 per cent dynamic. These are applications where the flow is required to change, as opposed to static systems where flows are constant. Variable flow products are best suited for dynamic applications. The following six basic concepts will help with the decision making process. However, you could affect flow change by using a modulating two-way or three-way valve, but that is a topic for another day. Most of the time this is accomplished with a circulating pump that changes speed depending on what the system or application requires.

Simply put, variable flow means “changing” flow, but becomes a more complicated concept depending on how, why and when the change is done. End-users, maintenance technicians, wholesalers and installers have to sift through: the various features and benefits the reasons for installing variable flow versus not and the when and where questions this variable flow renaissance has brought about.

Renaine circulation plus#

Over the last half decade plus there have been a number of pump manufacturers getting into the variable flow market here in North America.