The two manholes connect through a 16-inch jacket housed underneath the track that also holds the two, 4-inch main lines that supply the platform. In addition to the ¾-inch tubing, there are also eight 2-inch PEX main lines for each platform that run from two manholes in the landscape area, and then enter the slabs and stub into the manifold boxes. “We then placed six manifold boxes every 85 feet, housing a total of 20 TruFLOW Jr. “We laid down a total of 48,000 feet of ¾-inch Wirsbo hePEX tubing placed 6 inches on center,” says Greg Koba of Klamm Mechanical in Burnsville, Minn. This solution circulates through PEX tubing buried in the concrete to heat the station surface until it is warm enough to melt snow and ice. The system is designed for a 50% water/glycol solution, which is heated by a high-efficiency boiler. Each platform is 425 feet long and 26 feet wide with a snowmelt system embedded in the concrete to keep commuters safe from slipping in the icy, snowy Minnesota winters. The Northstar commuter rail in Ramsey, Minn., a suburb northwest of Minneapolis, consists of two main passenger platforms and a pathway to a large parking garage. Now that you’ve learned all the basics of radiant manifolds, let’s take a look at some of these workhorses in action. Copper manifolds tend to be used for higher-flow custom applications. HDPE (high-density polyethylene) “unassembled” manifolds are typically used for direct-burial applications, such as turf conditioning or permafrost prevention. There is also an EP manifold that features a 1-inch barrel with 2- through 8-loop configurations, accommodates 15.4 gpm, and can handle a maximum temperature of 194☏ at 44 psi. There are brass, stainless steel and engineered polymer (EP) versions that offer various barrel sizes, gpm, and temperature and pressure capacities.įor example, the TruFLOW brass manifold offered by Uponor comes in a 1-inch or 1¼-inch barrel with two through 12 loops and accommodates 21 gpm with a temperature/pressure capacity of 194° F at 145 psi. Most manifolds in today’s systems are “pre-assembled,” with the supply and return together in one assembly. Some modular manifolds can also accommodate additional add-on loops, if necessary. They can come in two- through 12-loop configurations with the most common being four to six loops. Manifolds are available in a variety of shapes and sizes to accommodate various installation applications. Now, contractors can simply take the manifold out of the packaging, mount it on a wall or in a manifold cabinet and attach the tubing. Earlier versions required onsite assembly of the parts and pieces before installation. Radiant manifolds have evolved over the years. They can also feature manual or automatic air vents and fill-and-purge ports, which are used during commissioning (i.e., initial startup) of a radiant system. They can include ball valves to shut off the entire manifold as well as all the loops tied to that manifold and They can feature a temperature gauge to show the temperature differential between the supply and return water temperature They can have actuators, which turn individual loops and/or zones on and off They can have flow meters, which allow adjustment of the volume - measured in gallons per minute (gpm) - through the individual loops of the radiant system
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |