3/26/2023 0 Comments Minitube manta![]() ![]() The availability of new hardware further simplifies the installation. There have been many successful applications of minitube distribution systems ranging from residential retrofits all the way up to 170,000-sq.-ft. The injection pump will function equally well in this location. This component would allow the injection pump to be located near the manifold station as shown in Figure 4. Other hardware that could speed installation of a minitube system includes Webstone’s recently released Hydro-Core hydraulic separation interface/purging valve. In the future, keep your eyes open for ECM-based circulators that also have the necessary logic for outdoor reset-based injection mixing controls already built in. networked devices, they eliminate the need of separate controls, and speed installation. There also are some circulators currently on the market from Taco and Grundfos that have a complete injection mixing controller built in. Examples include variable-speed injection pump controllers from tekmar, Taco, Honeywell and HBX. Several hardware options also are available to control the multiple injection pumps involved in a multi-zone minitube system. Low pressure drop in the headers and hydraulic separator creates very little tendency for the circulators to interact with each other. This will result in very little pressure drop along the length of the headers. My suggestion is to select a piping size that keeps the maximum flow velocity at around 2 ft. It is important to generously size the headers on both sides of the hydraulic separator. Hydraulic separation between the injection pumps and boiler circulators.Īrguably, these functions could be provided using other multiple hardware components, but not with the installation simplicity and minimal space requirement offered by the “3-in-1” functionality of the hydraulic separator. This device provides three desirable functions: This system uses a hydraulic separator between the boilers and injection pumps. In many cases, this temperature difference is four or more times greater than the temperature drop across the manifold station.įigure 3 shows the modern way to set up a multi-zone minitube system. ![]() ![]() the boiler outlet temperature minus the floor circuit return temperature). The piping between the mechanical room and manifold station is now sized for the flow rates associated with a much higher temperature difference (e.g. In minitube systems, the mixing takes place at the manifold station(s). Using this approach, the piping between the mechanical room and manifold station(s) must be sized for the flow rate associated with a typical manifold temperature drop of 15° F to 20° F. The piping details for a typical injection mixing system are shown in Figure 1. Most injection mixing systems used with radiant floor heating perform the mixing in the mechanical room and distribute relative low temperature water to manifold stations. Reduced flow rates allow for smaller piping and smaller circulators. This high temperature difference allows a relatively low flow rate to carry a significant amount of heat. Like most injection mixing applications, minitube distribution systems leverage the high temperature difference between a “hot” boiler and a low temperature heating distribution system. They are well-suited to projects where a conventional boiler that operates with water temperatures in the range of 160° F to 180° F under design load conditions supplies a low temperature load such as slab-type floor heating. Minitube distribution systems are a specialized application of injection mixing. ![]() This is where a minitube distribution system might save several thousand dollars. ![]()
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