RADIANT CEILING PANELS - Sigma Products

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RADIANT CEILING PANELSSLC / SMCTECHNICAL CATALOGMANUFACTURERS OF HYDRONIC HEATING AND COOLINGCOMMERCIAL & INDUSTRIALsigmaproducts.com T. 905.670.3200 F. 905.670.3822

SIGMA RADIANT PANEL SYSTEMS SLC/SMCTABLE OF CONTENTSPRODUCT OVERVIEW & DESIGN CONSIDERATIONS 5SLC LINEAR RADIANT CEILING PANELS. 9Unit Specifications .10Capacity Data .12Dimensions & Weights .14Pressure Drop Data .15Standard Shapes .17Installation Detail Diagrams .19Conceptual Renderings .28Guide Specifications .42SMC MODULAR RADIANT CEILING PANELS. 45Unit Specifications .47Capacity Data .48Dimensions & Weights .50Guide Specifications .52sigmaproducts.com 905.670.32003

SIGMA RADIANT PANEL SYSTEMS SLC/SMCPRODUCT OVERVIEWWith an abundance of styles and configurations, a Sigma Radiant Panel selection is sure to meetboth the design needs of architects and performance needs of the mechanical engineer.Performance data for radiant hydronic heating panels has been verified by independent testing atthe University of Waterloo in Ontario, Canada. Standard finish is textured white to match angle/teemouldings normally used for acoustic ceiling tile type installations. Custom finishes are available,and modular panels can also be silkscreened to simulate acoustic ceiling tile patterns.SLC Sigma Linear Ceiling PanelsLinear aluminum extruded panels with a castellatedsmooth face profile are available in a variety of widthsand lengths to accommodate the perimeter planning ofany building ceiling, including acoustic ceiling tile,drywall, or bulkhead ceiling types. Panel widths aremanufactured to fit into standard T-bar systems, and arealso available with extruded T-frames for mounting intodrywall or bulkhead ceiling applications.SMC Sigma Modular Ceiling PanelsModular drop-in panels are available in standard 2’ x 2’and 2’ x 4’ sizes, as well as custom sizes, for easymounting into new or existing ceiling grids.BASIC PRINCIPLESLike the sun, radiant panels transfer energy directly toany surface the panel “sees”, much the same way thatthe sunshine illuminates a room. The uniformity oftemperatures comes from the natural absorption and reradiation of energy between all interior surfaces.Radiant heat travels in straight lines until it reaches asolid object. The heat warms that object and is reradiated to nearby colder objects. Unlike convective heatwhich is actually a current of warm air, radiant heat doessigmaproducts.com 905.670.3200not rise. The floor is kept as warm as all other absorbingsurfaces. Through this silent, non-mechanical process,radiant heating panels create a thermal barrier at theperimeter of the building providing a uniform draftlesswall of warmth. This system provides an excellentintegrated building heating/cooling design. The entireceiling and all surfaces exposed to the radiant panelsbecome part of the heating/cooling system by absorbingand re-radiating heat, providing a comfortableenvironment.5

SLC/SMC SIGMA RADIANT PANEL SYSTEMSPRODUCT OVERVIEWUnlike conventional HVAC systems, radiant heatingpanels do not rely on room temperature. The criticaldesign parameter is the difference between the meanpanel temperature and the average unheatedtemperature of all surfaces within the space. If theaverage unheated surface temperature (AUST) and thetemperature of the air in a room equals the mean paneltemperature (MPT), there will be no net heat transfer.When the AUST falls below the MPT, the panels radiateenergy into the room. The energy radiated does notdirectly warm the air, but rather warms the glass/walls/furniture/floors and people inside of the room. Theseobjects in turn warm the air.The mean radiant temperature within a space is one ofthe most important factors influencing occupantcomfort. Sigma Radiant Panels affect the mean radianttemperature directly by raising the surface temperaturesin the space, and thereby providing occupants withsuperior control of ambient conditions.DESIGN CONSIDERATIONSRadiant heating design is similar to that of conventionalhydronic heating systems. Zone thermostats supply hotwater to panels that respond instantaneously to give thespace the necessary heating. Piping is located in theceiling plenum which is usually readily accessible.As the panels raise the Mean Radiant Temperature inthe space, they make occupants more comfortable atambient temperatures lower than those required ofconvective systems. Consequently, Sigma recommendsan inside dry bulb temperature 3 to 4 Deg F below thatnormally used with convective systems.Room loads should be calculated in the normal manner,using the ASHRAE guide. Calculations based onexcessive factor of safety room loads should not beused, because such assumptions result in excessivepanel width being specified. Using too wide a panel forthe application reduces both effectiveness andefficiency of the system.Sigma utilizes 5/8” OD (1 2” nominal) copper tube,allowing for the use of standard plumbing fittings. All U-6bends and spiral panel interconnectors (to connect multi-panel circuits together) are expanded so that nocouplers are required. Access panels are easy to specify,and are essentially separate, removable, radiant panelswith no copper. This provides the installer and owner ameans to access the hot water supply and hot waterreturn connections in drywall or bulkhead ceilingconfigurations. To properly access a given ceiling, Sigmarecommends that access panels be at least 12 incheslong. Note that designers should account for heatingcapacity reduction due to access panel insertion into abuilding design. For example, if the wall to walldimension of a room is 10 feet, and an 18” long accesspanel is used, then the maximum active copper length isreduced from 10 Feet to 8.5 Feet. If the room requires4000 Btuh of heat, then the panel must supply 4000Btuh/8.5 feet 471 Btuh/lineal feet. For the room withan acoustic ceiling tile-type ceiling, and no access panel,only 400 Btuh/lineal feet is required. Once the Btuh/lineal feet is correctly established, use the capacitycharts to ascertain the specific Sigma radiant panel thatworks for you.DESIGN EXAMPLE(A) Determine the heat lossCalculate the realistic heat loss of the perimeter usingstandard ASHRAE methods. As explained above, do notuse excessive safety factors. In this design example weshall use a heat loss of 8500 Btuh.(B) Determine the available length of panel per zoneRadiant heating panels should run continuously alongthe perimeter of a room or area. Sometimesobstructions such as building columns, partition walls,or changes in direction influence the available length ofactive panel (i.e. panel where copper can be installed).Typical column spacings in buildings are 20 to 30 feet.Generally, using the longest panel length is mosteconomical and efficient. Bear in mind, however, thatwhile Sigma can produce panels up to 14 feet long,these are extremely awkward to handle (especially forwidths over 24”). Both the Sigma factory and, moresigmaproducts.com 905.670.3200

SIGMA RADIANT PANEL SYSTEMS SLC/SMCPRODUCT OVERVIEWimportantly, the jobsite installation personnel will haveissues with bowing and weight. For this reason, Sigmarecommends maximum panel lengths of 13 feet.As an example, assume a building has 24” squarecolumns spaced on 26 foot centres. The available panellength is reduced to 24 feet, and this would typically besupplied as two 12 foot panels.(C) Determine the available length of panel per zoneDividing the heat loss from (A) by the available panellength from (B) gives the required capacity in Btuh/Lineal foot or Watts/Metre. For a given Average WaterTemperature , simply choose the panel configurationthat meets the required capacity. For example, assumea heat loss of 8,500 Btuh for each 26 foot bay. Thisgives 8500/24 354 Btuh/Lineal Foot.(E) Calculate design water temperature dropUsing 2 of the 18-3 pass panel; each panel is 18 incheswide by 12 feet long. The panels are interconnected usingSigma spiral panel interconnectors.Each panel is 12 ft. x 3 pass 36 ft. copper/panel2 panels: 2 x 36ft 72ft. straight copper.3 interconnectors between the 2 panels.@ 0.85 USGPM, we interpolate from the Pressure DropChart in Section 5. E.(Page 15):Pressure Drop in ft. H2O/100ft. 1.4Interconnector Pressure Drop in ft. H2O 0.125Therefore:From the Sigma capacity tables at an assumed AverageWater Temperature of 180 deg. F, choose 18-6 passradiant panel which gives 406 Btuh/Lineal foot. Notethat a 6 pass panel requires same end Hot WaterSupply/Return connections. If opposite end connectionsare required, and for simplicity, assuming the AverageWater Temperature was 190 deg. F, the 18-3 passradiant panel with a capacity of 379 Btuh/Lineal Footwould be chosen. Note that the Sigma capacity tables donot show every possible available capacity, and someinterpolation is required. For example, 24-6 pass can beinterpolated between 24-4 pass and 24-8 pass. Contactyour local representative if you require specificcalculations.(D) Calculate design water flowThe water flow rate is calculated from:USGPM Heat Loss (Btuh) / (500 x WTD)Where WTD Water Temperature Drop in this example,the heat loss is 8500 Btuh and with a desired WTD 20deg. Fsigmaproducts.com 905.670.32007

SIGMA RADIANT PANEL SYSTEMS SLC/SMCSLCLINEARRADIANT CEILING PANELSsigmaproducts.com 905.670.32009

SLC/SMC SIGMA RADIANT PANEL SYSTEMSSLC UNIT SPECIFICATIONSOVERVIEWSigma Linear Radiant Panels are generally used inapplications where hydronic heating is required for wallsadjacent to building exteriors, also known as perimeterwalls. Linear panels have a castellated or smooth face,and Sigma offers, but is not limited to, a variety ofstandard extrusions. The extrusions can beinterchanged to provide an end product that is tailoredto the customer requirements, whether this be a simple,flat (2-Dimensional) panel used for T-Bar type ceilings, ormore architecturally pleasing designs such as exposedceilings, nominal panel widths start at 4”, and continuein increments of 2” to virtually any width required. Aswell, Sigma provides 6” extrusions with either 1 or 2copper saddles allowing the density of copper to doublefor a given panel width. This allows for an increase inheating capacity given a fixed panel width application.As such, Sigma Radiant Panels are a flexible, efficient,and aesthetically pleasing solution for your hydronicheating needs.CONSTRUCTIONSigma Linear Radiant Panels are constructed fromaluminum-extruded planks in a variety of profiles. Eachextrusion type has been designed with the same tongueand groove detail to facilitate interchangeability with allother extrusions. After panel lengths are identified, thenecessary extrusions are cut into planks, which simplysnap together longitudinally. A small screw is drilled atthe plank interfaces, and this, combined with other clips,provides necessary rigidity to the panel. In order toreduce the amount of field work required, all of thisconstruction occurs at the Sigma factory and arrives onsite as a completed panel cut to the customer-specifiedlength.10Once the planks are cut and assembled, they are readyfor painting. The exposed surface of the panel is paintedwith a specially formulated polyurethane powder paint toprovide a textured low gloss finish, capable ofwithstanding the requirements inherent with thermalcycling. After painting, a non-hardening Heat TransferPaste is applied at the interface between the copper andthe aluminum saddle, which is an integral part of theextrusion.The straight copper tubes associated with the specificRadiant panel are placed into aluminum saddles afterthe heat transfer paste has been applied. As an optionSigma can also pre-solder and pressure test theserpentine copper circuit at this stage. All ends ofcopper that require site connection, such as Hot Watersupplies, Hot Water Returns, or interconnections toother panels on long circuits, are bent up at a slightangle at the factory.In order to provide a uniform contact area betweencopper and aluminum, the copper circuit is attached tothe aluminum saddles via special clips spaced amaximum of 24” apart. Cross Braces are added onto theRadiant Panel to facilitate site installation via wirehangers or alternate mounting methods. Finally, Sigmaplaces labels onto the panel to indicate the panelorientation (female side of panel facing perimeter wall),as well as to identify the panel as per the Sigmadocumentation submittal. This same identifying label isaffixed onto the product when it is brown-wrapped andultimately placed vertically onto a skid for shipping tothe customer.sigmaproducts.com 905.670.3200

SIGMA RADIANT PANEL SYSTEMS SLC/SMCSLC UNIT SPECIFICATIONSMATERIAL SPECIFICATIONPANEL — Extruded Aluminum, various profiles, castellated or smooth on the exposed side, with identical tongueand groove design for interchangeability. Copper Saddleis integral to each extrusion. Contact us for other extrusions not shown in this catalogue.SIZES — Panel widths from 4” and up, in increments of2”. Bullnose, Channel extrusions available for 3-D applications. Panel Lengths custom cut to customer requirements.PAINT — Standard is Sigma Radiant Panel White(“RPTXT2” color) Polyurethane-Polyester Formulation inTextured White. Contact us for custom colour options.COPPER — 5/8” (16 mm) Outside Diameter, tempered.Standard is straight copper pre-bent at customer Hotwater Supply/Return locations, and u-bends suppliedloose for field installation. Optionally: copper can be presoldered and tested at factory. Copper is held down tointegral aluminum panel saddle via zinc-plated springsteel clips, with non-hardening heat transfer paste applied between copper and saddle.SUSPENSION — Mounting frame is not included instandard orders. A custom option is 1” wide x 2” high x1/16” thick aluminum extruded T-Frame, mechanicallyclinched by Sigma, used generally for drywall type ceilings with 3” clearance to all walls. As well, Sigma stocks1’ wide x 2” high x 1/16” thick aluminum tee (144”lengths0 and 1” x 1”x 1/16” thick aluminum Angle(126” lengths) for LOOSE framing requests, generallywall to wall applications.INSULATION — Standard is NO Insulation. Option: 1” or2” Foil Faced Batt Insulation installed at factory, dependent on Customer Mechanical Specification. Insulation can be foil faced one side only, or completely ENCAPSULATED.WEIGHT — Dependent on copper tube density. Use awet weight of 2.5 Lbs/Sq.Ft (12.2 kg/Sq.Mtr) when calculating requirements for suspension of panels to building structure.SUPPORT — Extruded aluminum channel cross bracesspaced every 36” maximum.sigmaproducts.com 905.670.320011

SLC/SMC SIGMA RADIANT PANEL SYSTEMSSLC CAPACITY DATAIMPERIALMean Water Temperature (Degrees F)NOMINAL Panel Width (inches) - Tube 45606387817659658741064Heating capacities are shown in Btuh/Lineal ft. and are based on 700F Room temperature. For every 10F decreasein Room temperature below 700F, the output increases by 0.9%. For every 10F increase in Room temperatureabove 700F the output decreases by 0.9%12sigmaproducts.com 905.670.3200

SIGMA RADIANT PANEL SYSTEMS SLC/SMCSLC CAPACITY DATAMETRICMean Water Temperature (Degrees C)NOMINAL Panel Width (millimetres) - Tube 8401023Heating capacities are shown in Watts/Lineal Metre and are based on 210C Room temperature. For every 10Cdecrease in Room temperature below 210C, the output increases by 2%. For every 10C increase in Room airtemperature above 210C the output decreases by 2%sigmaproducts.com 905.670.320013

SLC/SMC SIGMA RADIANT PANEL SYSTEMSSLC DIMENSIONS & WEIGHTSUnit ModelNOMINAL WidthActual PanelCeiling OpeningWeightWidth-TubesInches (mm)WidthSIGMA T-Frames(operating)Inches (mm)“B”lbs./ft. (kg/m)“A”6-1 andNumber of Panels6-2PanelWidth of each12-2Ceiling Opening Width0.7SIGMA(1.04 kg/m)forsupplied6”(152.4mm)6.082” (154.5mm)6.582”"A"(166.5 mm)NominalPanel WidthActualPanel Width0.9Frame(1.34 kg/m)'Tee'for Drywall"B"12” (304.8 mm)11.977” (304.2mm) 12.477” (316.2 mm)inches (mm)inchesmminchesmminchesmm12-41 @ 6 (152)6152.46.082154.56.582166.51.5 (2.23 kg/m)1.8 (2.68 kg/m)2 @ 418-3(203)8203.27.977202.68.477214.618” (457.2 mm)17.872” (453.9 mm) 18.372” (465.9 mm)18-62 @ 6 (304)12304.811.977304.212.477316.22.2 (3.27 kg/m)3 @ 624-4(457)18457.217.872453.918.372465.92.9 (4.31 kg/m)4 @ 624-8(610)24609.623.767603.724.267615.73.6 (5.35 kg/m)24” (609.6 mm)23.767” (603.7 mm) 24.267” (615.7 mm)5 @ 6 (762)3076229.662753.430.162765.42.7 (4.01 kg/m)30-53.6 (5.35 kg/m)30-104.5 (6.69 kg/m)30” (762 mm)29.662” (753.4 mm) 30.162” (765.4 mm)6 @ 6 (914)36914.435.557903.136.057915.136-636-1236” (914.4 mm)35.557” (903.1 mm) 36.057” (915.1 mm)4.4 (6.54 kg/m)5.4 (8.02 kg/m)1.Dimensions in Table 1 are sample widths. Nominalpanel widths from 4” to 48” are available in 2 inchincrements.3. Sigma supplied perimeter T-Frames are constructedwith T aluminum extrusions. Opening dimensions are forSigma supplied Frames only.2. For panel lengths, allow a minimum of .187”(5 mm)for expansion clearance from end of panels to inside ofTee.4. For customer-supplied frames allow min .125”(3mm)width clearance between the edge of the panel and theinner edge of the frame for expansion. Allowminimum .187” (5mm) length clearance between theedge of the panel and the inner edge of the frame.14sigmaproducts.com 905.670.3200

SIGMA RADIANT PANEL SYSTEMS SLC/SMCSLC PRESSURE DROPIMPERIALFlow RateVelocityPressure DropInterconnector(GPM

ceiling plenum which is usually readily accessible. As the panels raise the Mean Radiant Temperature in the space, they make occupants more comfortable at ambient temperatures lower than those required of convective systems. Consequently, Sigma recommends an inside dry bulb temperature 3 to 4 Deg F below tha

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