H Y D R O C O U R S E T R E N C H H E A T I N G Natural convector trench heating system Modular design for bespoke applications Architectural floor grilles High efficiency finned tube element
Contents PAGE IDENTIFICATION Introduction 2 Authority 2 DESCRIPTION Hydrocourse Trench 2 Range 3 Features 3 Casing 3 Elements 3 Example A & B 3 Accessories 4 Grilles 4-7 Special options 4 PERFORMANCE 8 Correction factors 9 IDENTIFICATION Introduction This brochure provides comprehensive information about Dunham-Bush Hydrocourse trench heating, with guidance on selection, application, use and supply. Dunham-Bush Hydrocourse trench heating comprises powder coated steel casings, finned tube elements and satin anodized aluminium grilles. Hydrocourse provides natural convective heat and produces a warm air current which can be used to off-set local down draughts and heat losses. It is suitable for operation with pumped hot water systems. Authority Dunham-Bush Ltd operates a quality control system and is a registered company of Assessed Capability to BS EN 9001:2015 APPLICATIONS General 10 Selection 10 Using factors - Applications 1& 2 11 Expansion 12 Typical layout 13 Dimensions 14-24 ENGINEERING SPECIFICATION General 25 Casings 25 Edge trim 25 Floor grille 25 Levelling screws 25 Finish 25 Elements 25 Working pressure & temperatures 26 Performance 26 Standard parts & accessories 26 Packing 26 CONSTRUCTION Handling 27 Storage 27 Preparation 27 Layout drawings 27 PRICES & CONDITION OF SALE Prices 27 Conditions of sale 27 Availability 27 Ordering 27 Delivery 27 TECHNICAL SUPPORT SERVICES Product support 27 DESCRIPTION Dunham-Bush Hydrocourse trench heating is manufactured in 22 standard models and in fixed lengths of 500mm, 1000mm, 1500mm, complete with telescopic 1000-1500mm casings and a 50-1000mm trim length casings. The system comprises casings in black powdered coated steel, copper tube element with aluminium fins and rigid or roll satin anodized aluminium grilles. The standard finned element lengths are manufactured with 22mm O.D. copper tube and aluminium fins having a nominal spacing of 6mm. Some elements are also available with 15mm copper tube Casings and elements are sized to accommodate single or double runs of finned element lengths where appropriate, in progressive ascending output combinations. Return pipework options are available. 2
MODEL RANGE AND DIMENSIONS Range Standard casing models:- HTA-1 to HTA-10 Return pipework models:- HTA-1/P to HTA-10/P Fin types:- X = 60mm x 48mm W = 70mm x 76mm Y = 100mm x 70mm Z = 100mm x 100mm Features Built-in level adjustment Uniform heat distribution Minimal maintenance Silent operation Effective control of space heating Model Reference Casing Width Casing Height Fin Types (Height) HTA-1 140 125 W-070 HTA-2 270 100 WW-070 HTA-3 270 150 WW-070 HTA-4 220 175 YY-100 HTA-5 150 175 W-070 HTA-6 220 200 Z-100 HTA-7 300 200 YZ-100 HTA-8 350 150 YY-070 HTA-9 300 300 WW-070 HTA-10 400 300 ZZ-100 HTA-1P 180 125 W-070 HTA-2P 310 100 WW-070 HTA-3P 310 150 WW-070 HTA-4P 260 175 YY-100 HTA-5P 190 175 W-070 HTA-6P 260 200 Z-100 HTA-7P 340 200 YZ-100 HTA-8P 390 150 YY-070 HTA-9P 340 300 WW-070 HTA-10P 440 300 ZZ-100 Casing The casing type is defined by model reference; H - (Hydrocourse) TA (Transverse Aluminium Grille Bars) and the casing size type number. The P suffix denotes whether a casing is fitted with provision to accommodate return pipework, and the "S" suffix denotes whether a casing is a bespoke style. Example A Model HTA-2 comprises a 270mm wide, 100mm high case, with two runs of W element, size (70mm high x 75mm wide). Example B HTA-7P comprises a 340mm wide, 200mm high case, with provision for return pipework and a double run of element, consisting of one run of Y element size (100mm high x 70mm wide) and one run of Z element (size 100mm high x 100mm wide). Elements Standard element types X, W, Y and Z are manufactured in 22mm O.D. copper tube. The number of elements, orientation (by fin height) is defined by the number of letters before the fin size. e.g. W-070-22 = single run of W element set at 70mm high YY-100-22 = double run of Y element set at 100mm 3
ACCESSORIES AND BESPOKE OPTIONS Accessories End caps for finishing Hydrocourse trench casing runs, and 90 / 270 butt & mitred corners are available as standard in all casing sizes. Mitred joints are available to any specified angle at extra cost. Expansion joints and guides where specified. Typical expansion joint & pipe guides Grilles Floor grilles have a standard anodized finish in AA5 Satin Silver, made from aluminium spar profile Y-bar. Roll grilles are suitable for light applications, and rigid grilles are suitable for medium applications, as classified in BS EN 13264:2001. Special bespoke options available:- i) Stainless steel grilles are available for all casing sizes. ii) Special grilles are available for heavy duty loads and traffic upon request. iii) When specified linear grilles are available for suitable trench applications. iv) Curved grille is available for curved trench applications. v) Decorative wooden grilles are also available for domestic or architectural applications. vi) Fixed height and telescopic mounting feet can be made to order, and accommodate the void between the finished floor level and the depth of trench casing. vii) Note that non-standard grille dimensions may affect the performance. Case style HTA-7 (300mmH x 200mmW casing) with YZ-100 elements. 4
GRILLES Butt joint corner arrangement Mitred corner arrangement (90 standard, other angles on request) 5
GRILLES Bespoke Linear Grille Applications Stainless Steel U-Bar Roll Grille 6
PERFORMANCE Standard heat outputs to BS EN 442 with LPHW 70 C mean, 0.32kg/s water mass flow rate, ambient air at 20 C Casing Style Element Type Casing Width (mm) Casing Height (mm) Standard Output Qs (W/m) HTA-1 W-070 140 125 189 HTA-2 WW-070 270 100 272 HTA-3 WW-070 270 150 428 HTA-4 YY-100 220 175 350 HTA-5 W-070 150 175 222 HTA-6 Z-100 220 200 357 HTA-7 YZ-100 300 200 482 HTA-8 YY-070 350 150 497 HTA-9 WW-070 300 300 690 HTA-10 ZZ-100 400 300 969 HTA-1P W-070 180 125 189 HTA-2P WW-070 310 100 272 HTA-3P WW-070 310 150 428 HTA-4P YY-100 260 175 350 HTA-5P W-070 190 175 222 HTA-6P Z-100 260 200 357 HTA-7P YZ-100 340 200 482 HTA-8P YY-070 390 150 497 HTA-9P WW-070 340 300 690 HTA-10P ZZ-100 440 300 969 1. Standard outputs at T = 50K to BS EN 442 standard conditions (LPHW 75/65 C and ambient air 20 C) and water flow rate 0.32kg/s 2. For different LPHW temperatures, ambient air temperatures and water flow rates, refer to page 8. 7
PERFORMANCE Corrected output (Q c ) = Qs x F1 x F2 where Qc = Corrected output (W/m) Qs = Standard output at standard conditions (W/m) Water flow rate (kg/s) = Qs / (TF TR) x Cp where TF = water flow temperature ( C) TR = water return temperature ( C) Cp = specific heat capacity of water (kj/kg K) For most applications, Cp can be taken as 4.187 kj/kg K Correction factor F1 for different water temperatures T (K) F1 T (K) F1 T (K) F1 T (K) F1 T (K) F1 20 0.37 30 0.56 40 0.77 50 1.00 60 1.24 21 0.39 31 0.58 41 0.79 51 1.02 61 1.27 22 0.41 32 0.60 42 0.81 52 1.05 62 1.29 23 0.43 33 0.62 43 0.84 53 1.07 63 1.32 24 0.45 34 0.64 44 0.86 54 1.09 64 1.34 25 0.46 35 0.66 45 0.88 55 1.12 65 1.37 26 0.48 36 0.68 46 0.90 56 1.14 66 1.40 27 0.50 37 0.71 47 0.93 57 1.17 67 1.42 28 0.52 38 0.73 48 0.95 58 1.19 68 1.45 29 0.54 39 0.75 49 0.97 59 1.22 69 1.47 Correction factor F2 for different water velocities Water Water F2 Water Water F2 Water Water F2 Water Water F2 Flow Rate Velocity Flow Rate Velocity Flow Rate Velocity Flow Rate Velocity (kg/s) (m/s) (kg/s) (m/s) (kg/s) (m/s) (kg/s) (m/s) 0.02 0.06 0.898 0.12 0.38 0.963 0.22 0.69 0.986 0.32 1.00 1.000 0.04 0.13 0.923 0.14 0.44 0.969 0.24 0.75 0.989 0.34 1.06 1.000 0.06 0.19 0.937 0.16 0.50 0.974 0.26 0.81 0.992 0.36 1.13 1.000 0.08 0.25 0.948 0.18 0.56 0.978 0.28 0.88 0.995 0.38 1.19 1.000 0.10 0.31 0.956 0.20 0.63 0.982 0.30 0.94 0.998 0.40 1.25 1.000 Water velocity (m/s) based on elements with 22mm copper tube; contact Dunham-Bush for guidance on correction factors with 15mm tube elements. 8
SELECTION & APPLICATION General Dunham-Bush Hydrocourse trench heating is designed to cover a broad range of casing sizes, grille styles and outputs. Heat is emitted by natural convection and provides evenly distributed warmth, ideal for preventing down draughts on cold surfaces such as outside walls and glazing. Standard casings are supplied in fixed lengths of 500mm, 1000mm, 1500mm. Telescopic casings with an adjustment range1 000-1500mm length are supplied for made-to-fit installations Similarly, trim casings with a range 0-1000mm can also be supplied for cutting on-site. Standard, telescopic and/or trim casings are fixed together on site to form a continuous heating run. End caps are available for finishing the ends of Hydrocourse trench cases. Where specified Hydrocourse trench heating can accommodate flow & return pipework. When using L.P.H.W or M.T.H.W as the heating medium in long lengths, consideration must be given to the change in output along the length due to the reduction in water temperature from flow water temperature to return water temperature. On long runs consideration must be given to accommodate the expansion of the element/pipework. Dunham-Bush can supply expansion bellows and guides upon request. Step 1. Select a model to suit to the desired dimensions that the floor void/trench will accommodate. Base the selection of the model firstly by the model s casings height. Trench heating is supplied with an additional height adjustment of up to 50mm (with factory-fitted M6x70 levelling screws) Adjustable casing supports can also be supplied for floor voids greater than 150mm in depth, up to the depth of 450mm. Special, bespoke casings can be considered contact your Dunham-Bush represetative. Step 2. Once the desired model is selected, calculate the nominal output per length, using the correction factors. Step 3. Decide the location of the trench heaters and consider floor grilles. If heaters are to be installed in areas of high foot traffic, rigid grilles are more suitable than roll grilles. The standard grille offered for all applications is the Y-Bar roll grille. Step 4. Consider finishes as well as control accessories; contact Dunham-Bush for further guidance. 9
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SELECTION & APPLICATION Provision for expansion, general considerations. When the elements and tubing are connected to form a continuous run, provision must be made for the resulting expansion when the heating medium is applied to the system. It may be possible, in some circumstances, to arrange for a small amount of expansion to be taken up within the casing by allowing the pipework to float. But it is usually necessary to provide expansion bellows & guides to compensate for the expansion. As a basic rule the maximum float should not exceed 6mm. Because of the limited space available within the trench casings it is not always possible to fit proprietary expansion bellows, and for this reason Dunham-Bush offer purpose made expansion joints and suitable pipe guides. Quantity of Expansion Joints and Guides To decide on the quantity and suitability of Dunham-Bush expansion joints & guides for a particular application. The total amount of movement or expansion of the elements and tubing in the run being considered. This will depend upon the difference between the minimum installed and maximum operating temperature and the coefficient of the linear expansion of the tubing material. Each expansion joint & guide kit is capable of accepting up to 6mm maximum of expansion, i.e. 3mm from each end. 11
GENERAL ARRANGEMENT - CASINGS AND GRILLES 12
GENERAL ARRANGEMENT - ADJUSTABLE (TELESCOPIC) CASING SUPPORTS 13
HTA-1 SINGLE ELEMENT TYPE W-070 HTA-1P SINGLE ELEMENT TYPE W-070 14
HTA-2 DOUBLE ELEMENT TYPE WW-070 HTA-2P DOUBLE ELEMENT TYPE WW-070 15
HTA-3 DOUBLE ELEMENT TYPE WW-70 HTA-3P DOUBLE ELEMENT TYPE WW-70 16
HTA-4 DOUBLE ELEMENT TYPE YY-100 HTA-4P DOUBLE ELEMENT TYPE YY-100 17
HTA-5 SINGLE ELEMENT TYPE W-070 HTA-5P SINGLE ELEMENT TYPE W-070 18
HTA-6 SINGLE ELEMENT TYPE Z-100 HTA-6P SINGLE ELEMENT TYPE Z-100 19
HTA-7 DOUBLE ELEMENT TYPE YZ-100 HTA-7P DOUBLE ELEMENT TYPE YZ-100 20
HTA-8 DOUBLE ELEMENT TYPE YY-070 HTA-8P DOUBLE ELEMENT TYPE YY-070 21
HTA-9 DOUBLE ELEMENT TYPE WW-070 HTA-9P DOUBLE ELEMENT TYPE WW-070 22
HTA-10 DOUBLE ELEMENT TYPE ZZ-100 HTA-10P DOUBLE ELEMENT TYPE ZZ-100 23
ELECTRIC TRENCH HEATING Model: HTA-E Unit size: 200mm wide x 125mm deep. Element Enclosure: Electric IP 66 rated Levelling Feet: depth) M6x70 (1-50mm adjustment on casing Our range of electric trench heaters are an alternative option to the standard LPHW convectors. Natural convection is achieved from an electric element with outputs ranging from 150 1000W. The electric heaters can have one of three standard selections for grille styles. Y-bar grille being the most common, to the I-Bar/U-Bar grilles for medium to heavy foot traffic. Available lengths and outputs: 800mm casing length outputs 150 750 W 1000mm casing length outputs 200-1000W 1200mm casing length outputs 250-1000W 1500mm casing length outputs 300-1000W 24
ENGINEERING SPECIFICATION The Hydrocourse trench heaters shall be manufactured by Dunham-Bush Limited, Downley Road, Havant, Hampshire, PO9 2JD. The models, style, numbers and quantities shall be as indicated in the schedule and/or on the drawings. The construction of all heaters must comply with the following specification. General Each trench heater shall consist of a sheet metal casing, heating coil. Where appropriate to the model, water control valves shall be fitted into the casing. Casing Construction Casings shall be constructed from 1.2mm mild steel panels, adequately stiffened to minimise distortion. All casings shall have rounded edges, for increased safety. Casing Dimensions Each model has its own unique dimensions, Our Hydrocourse heaters have a selection of depths and widths to suit all trench applications. Casing dimensions shall have a manufacturing tolerance of ±1mm. Fitted Grilles All fitted grilles shall be pencil proof, manufactured from aluminium alloy in either Y-bar or I-Bar profile. Our grilles are manufactured in either rigid sections to suit the Hydrocourse trench length, or Roll-up grille for continuous runs up to and including 3000mm in length on request we can use U-Bar stainless steel. Alternative option from our standard transverse grille is the linear option. Linear grille is only available in Y-bar aluminium in set lengths of 1.0m, 1.5m 2.0m. Curved grilles are an available option, a.dwg file is required at quotation stage. Please note that without a.dwg file, we are unable to proceed with an order until all information is received. Casing and Grilles Finish All mild steel casing components, casings and grilles shall be pre-treated before the application of polyester powder coating. Casing standard colour : Black 00 E 53, 10% gloss. Grille standard colour: Silver AA5 anodised finish. Colours to BS4800:1989. Other colours available on request. Elements Elements shall be supplied in single lengths of 15mm O.D. solid drawn copper tubes, expanded into single plate aluminum fins. Test pressures for coils only 10.5 barg cold test 7.0 barg max water pressure. 25
ENGINEERING SPECIFICATION Copper tube/aluminium finned elements Element types X, W, Y and Z consist of 22mm O.D. copper tube with (X) 60mm x 48mm, (W) 70mm x 75mm, (Y) 70mm x 100mm and (Z) 100mm x 100mm aluminium fins having a minimum thickness of 0.35mm. Outside diameter of tube shall be as listed below. Element Min Max Tube dia. O.D.mm O.D.mm 22MM 22.055 21.975 15MM - - All copper tube/aluminium finned elements shall have plain ends and shall be available in lengths of 1000 and 1500mm. Unless otherwise stated the finned length shall be 150mm less than the overall length, giving 75mm plain tube ends for connection to pipework (fittings by others). Working Pressure and Temperatures The working pressure and temperature and cold test pressure may be limited to those given for expansion joints and fittings used with elements. Element only Maximum working pressure 14.0 bar gauge. Maximum working temperature 175 C. Maximum cold test pressure 21.0 bar gauge. Anchors Where necessary, Anchors shall be provided by others. Performance Hydrocourse shall be capable of producing the heat outputs listed in the manufacturer s Product Catalogue, when installed in accordance with their recommendations. Heat outputs shall be derived from tests to BSEN 442. Standard parts 500mm, 1000mm and 1500mm fixed casings. 1000mm- 1500mm telescopic casings and 50-1000mm trim lengths. Casings shall include two element supports, one baffle, captive nuts and screws. Grille trims shall be supplied in 2000mm lengths and floor grilles in lengths of 500mm, 1000mm, 1500mm, (roll grille only is also available in 3000mm) Standard Accessories End plates, 90 / 270 butt corner, 90 / 270 mitred corners and expansion joints. Special Accessories Fixed height and Telescopic mounting feet, height and width as per customer requirements. Packing Hydrocourse Trench components shall be properly packed and labelled. Expansion joints & guides When specified, expansion joints & guides shall be supplied to suit the element. Expansion joints shall be manufactured from gliding metal and shall have plain copper female ends suitable for forming a capillary joint. Maximum working pressure of 2 bar gauge and (cold) test pressure of 3 bar gauge. Expansion joint pipe guide kits are manufactured from 1.6mm mild steel and shall be provided for fitting each side of an expansion joint at intervals along the element run to ensure only axial movement. Guide clips shall be slotted to allow element grading. 26
CONSTRUCTION Handling The purchaser is responsible for off loading. Heaters are grouped together and loaded upon a pallet up to 2.0m x 1.2m. When a significant quantity of heaters is delivered, they may be palletised and shrink wrapped, so a fork lift truck or some form of lifting equipment is strongly desirable. Care should be taken to ensure the heaters are not dropped or knocked under any circumstances. Storage Heaters should be stored under clean, dry conditions. The shrink wrap should not be removed until heaters are required for installation, unless damage in transit is suspected. Note the purchaser must examine the heaters promptly upon receipt and any claims for damage will only be accepted if, at the time of delivery, the consignment note is endorsed with a note detailing the damage and counter signed by the transport driver. Installation details Hydrocourse heaters are supplied with a copy of the Installation, Operation & Maintenance Instructions, which provide full details for installing, connecting and commissioning the unit. Additional copies are available upon request, or can downloaded from www.dunham-bush.co.uk. Preparation A suitable trench void should be prepared ready to accept the trench heating system. The trench void should be straight, uniform and level and free from obstructions that encroach on the casing, grille trim or grilles. If the trench system is to be cast into the floor, the installer must take adequate precautions to protect the dimensional stability of the casing assembly. Suitably sized plywood shuttering must be fitted to the grille recess prior to casting taking place. PRICES & CONDITION OF SALE Prices Dunham-Bush Ltd do not issue price lists but will be pleased to supply a written quotation upon request. Condition of sale The standard conditions of sale appear on all quotation and order acknowledgement forms. Additional copies are available upon request. Availability Hydrocourse trench heaters are supplied direct from our manufacturing plant. The availability varies with demand and should therefore be checked at the time of ordering. Packaging Heaters are placed on the pallets and given individual labels for referencing and then they are shrink wrapped. Each heater is marked to show the model, figure number, serial number and any reference given on the order for site identification. This information also appears on the consignment note. Delivery to site Hydrocourse heaters are delivered to site in accordance with our Conditions of Sale. The purchaser is responsible for the off loading and proper safe storage. Ordering and enquiry detail To allow us to process your order promptly, please refer to any quotation we have supplied and any relevant correspondence. Please send your order to our Agent or Sales Engineer who provided the quotation, remember to include the coil handings as incomplete information will delay manufacturing process. TECHNICAL SUPPORT SERVICES Product support In the United Kingdom and Ireland, Dunham-Bush has a network of Sales Agents, situated at strategic locations, to provide local support. Pipework connections Coil connections are either 15mm/22mm O.D straight pipe. Local isolating and regulating valves are recommended. Observe the correct flow and return positions, to ensure the rated heat output. Wiring diagram A project specific wiring diagram is supplied separately along with the installation instructions for reference when connecting the remote components where specified. 27
Quality Dunham-Bush operates a quality control system and is a company of assessed capability to BS EN ISO 9001:2015 Whatever the product, wherever its eventual destination, Dunham-Bush design and manufacturing policy has always been firmly based on technical quality. Other Dunham Bush products Series AM cased fan convectors Series BM concealed fan convectors Series CM cased fan convectors Series 600 ceiling tile heaters Series SL slim-line fan convectors Evolution radiant panels Evo-Lite radiant panels Dunham Strip radiant panels Lynx fan coil units Panther fan coil units Leopard fan coil units Cougar fan coil units Puma fan coil units Ocelot fan coil units Aerocourse fan-assisted trench heating Finvector perimeter sill-line heating Series UH unit heaters System LST low surface temperature radiators Sentry air curtains Sentinel air curtains BS EN ISO 9001: 2008 Manufacturer reserves the right to change any product specification without notice Dunham-Bush Ltd Downley Road Havant Hampshire PO9 2JD Tel. 023 9247 7700 Fax. 023 9245 3601 Email: info@dunham-bush.co.uk www.dunham-bush.co.uk 135-000-000-C May 2018