BTBa. FLUSHLINE Ventilated chilled beam for cooling, heating and ventilation. BTBa
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1 FLUSHLINE Ventilated chilled beam for cooling, heating and ventilation BTBa CEILING UNIT FLUSHLINE BTBa FLUSHLINE BTBa is a complete climate system offering immense flexibility. Ideal for large areas with large cooling requirements. Integrated in a suspended ceiling to give a clean appearance. Compatible with standard T-profiles. FUNCTION Cooling and ventilation (BTBa 1-A). Cooling, heating and ventilation (BTBa 1-AB). AREAS OF APPLICATION FLUSHLINE BTBa is suitable for all types of rooms cooled using water as a heat transfer medium: Offices and conference rooms Hotels Lecture theatres Computer rooms Banks Restaurants Laboratories KEY FIGURES Cooling effect: 3 W/m ( t mk = 1 C, = 1 l/sm). Heating effect: 115 W/m ( t = 3 C). Air flow: Up to 2 l/sm. Lengths: From 12 mm to 39 mm. Width: 592 mm (nominal 6). Height: 233 mm. Control Unit: In each room or centrally. Stifab Farex Control System, see separate brochure. We reserv the right to change the technical specification 63
2 ADVANTAGES OF FLUSHLINE BTBa FLUSHLINE BTBa is a ceiling unit supplied complete for integration in a suspended ceiling. FLUSHLINE BTBa is equipped with a protective lower section which ensures that air is supplied to the occupied zone without draughts occurring. The unit s air duct is easily accessible for cleaning via the cleaning cover placed at the end of the unit. FLUSHLINE BTBa is an excellent supply air unit. The narrow openings distribute the supply air in a thin jet along the entire length of the ceiling unit. Thanks to the advantageous supply air principle FLUSHLINE BTBa has a very low sound level. All essential suspension fittings (excluding screws for fastening to slabs) are supplied with each unit. Function Air duct BTBa 1-A: Cooling, ventilation Cooling battery FUNCTION Cooling: When cooling is required the coolant circuit valve is opened and chilled water flows through the battery. The indoor air is fed, using convection by gravitation and induction from the supply air, through the unit and removes the excess heat. Cooling battery Radiant heating: BTBa supplemented with a radiant lower section connected to the heating circuit. The heated water flows through the copper pipes that are connected to the extruded aluminium lower section and heats the room. The exchange of heat primarily takes place through radiation. The control system should be designed with a neutral zone (2 C), to avoid simultaneous heating and cooling. Refer to the separate Control System brochure. Design Air duct Radiant heat BTBa 1-AB: Cooling, heating, ventilation Cover for cleaning at the end of the unit INSTALLATION FLUSHLINE BTBa is designed to fit in standard support bars with a 6 mm modular measurement and with T-profiles that are 24 mm wide. FLUSHLINE BTBa is not suitable for 12 mm T-profiles. DESIGN FLUSHLINE BTBa is made of enamelled sheet steel. Visible components are enamelled in Stifab Farex standard white RAL 91 max. DE = 1. gloss value 3±6. The cooling battery is made up of copper pipes with aluminium fins. The air duct can be opened for cleaning using a cover at the end of the unit. The radiant bottom section, where applicable, is made of extruded aluminium with fixed copper pipes. Suspension consists of a ceiling bracket and drop rods. It can be adjusted laterally and vertically. Max. recommended operating pressure: 6 kpa Max. recommended test pressure for testing completed installations: 9 kpa Min. recommended flow temperature: +13 C Max. recommended flow temperature: +9 C The cooling water temperature should be selected so that the system operates without condensation. Horizontal connection 188 Ceiling bracket 48 Suspension: Installation set M9 Threaded drop rod M6 L = 5 mm Hole pattern ceiling bracket M9 64
3 STANDARD MODELS BTBa 1-A: Ceiling unit with two-way air supply. Cooling and ventilation. BTBa1-AB: Ceiling unit with two-way air supply. Cooling heating and ventilation. Colour: RAL 91 max. E = 1, gloss value 3±6. Width: 592 mm. Length: Exact lengths in mm: Standard lengths held in stock marked in bold above. Height: 233 mm. Connection: Horizontal from the end, air and water on the same side (OH). Standard models Air, push-in fittings (nipple) Damper Cooling Heat (where applicable) BTBa with horizontal connection (OH) Variants BTBa Cooling: Plain pipe ends Cu Ø 15 x.5 mm. Heating: Plain pipe ends Cu Ø 12 x 1. mm. Note, intense heating of the connection pipes can damage the internal solder joints, consequently brazing is not permitted. Air: Push-in fittings (nipple) Ø1 mm. The units are supplied with Installation set M9 (threaded bars and ceiling brackets without screws for securing to the slabs). Illustration on page 4. Air, push-on fittings (sleeve) Heat Cooling BTBa with internal horizontal connection (OI) Variants Connection OH = Horizontal from the end, air and water on same side. TH = Horizontal from the end, air and water on opposite sides. OI = Internal horizontal, air and water on same side. TI = Internal horizontal, air and water on opposite sides. Internal horizontal connection is adapted for vertical coupling. However, note that sound levels are higher with vertical coupling. Design In addition, to the standard design the following options are available: C folding lower section. D double nozzle row in the duct (where large air flow is required). E one-way supply air. BTBa with options DE - one-way air supply and double nozzles Effects BTBa 2 is an effect option offering a lower capacity, which is beneficial when a full length model is required but without the specified effect of BTBa 1. BTBa with option C - folding lower section 65
4 SPECIAL TYPES Colour Can be supplied in an optional colour or structured enamel on request. Accessories Design Flushline BTBa complete with factory fitted control system. Valves and actuators fitted to the ceiling unit s connections and a room sensor on the unit s under side. Connections Factory soldered nipples with connection thread G15, internal or external threads. Special variants Stifab Farex has a range of variants in addition to the material shown in the catalogue. Please contact Stifab Farex for further information. Threaded bar Thread lock Maximum drop bar length Threaded bar length ACCESSORIES Installation fitting M9S The four threaded bars in installation set M9 are replaced by double threaded bars interconnected with a thread lock. See illustration and measurement table to the right. Installation fitting M9S Installation Threaded Maximum fitting bar length drop rod length M9S M9S M9S Measurement table Installation fittings M9S 66
5 PROJECT PLANNING 1. Cooling capacity calculation Using the Stifab Farex heat balance software FARCLIM a designer can produce an assured basis for calculating the capacity requirement. 2. Installation area See The Project Planning Guide under Installation spacing overleaf. Physical limits of contract Ventilation: VE connection to nipple Ø 1 mm Cooling: RE Connection to pipe Cu15 mm 3. Physical limits of contract The installation of FLUSHLINE BTBa is easy to specify. The physical limit of contract is the point where the supply and return are connected to the cooling and heating medium systems and the connection sleeves on the air side. All parts in between these points are part of the system order. In order to avoid misunderstandings, contract negotiations should specify the physical limits of contract, preferably with a drawing as the example opposite. RE = Pipework contract VE = Ventilation contract Heating lower section: RE connection to pipe Cu 12 mm Example: BTBa with horizontal connection (OH) Control BTBa 4. Limitation of liability In projects where FLUSHLINE BTBa is included as a separate contract, it is appropriate that filling, pressure testing and venting be carried out by the pipework contractor. These routines can then be combined with commissioning of the entire system. RC RG 5. Recommended limit values Min. cooling water flow:.4 l/s Min. flow temperature: +13 C Temperature increase cooling water: 2 4 C Min. heating water flow:.12 l/s Highest flow temperature: +9 C Temperature reduction heating water: 5 2 C The cooling water temperature should be selected so that the system operates without condensation. Max. recommended operating pressure: 6 kpa Max. recommended testing pressure when testing completed system: 9 kpa 6. Venting Attempt to lay supply pipes higher than or at the same height as connections on the ceiling units. This will ensure that any air can be expelled at the min. recommended water flow per loop. 7. Circulated air openings in suspended ceilings See the Project Planning Guide under Circulated air openings overleaf. 8. Control System Depending on the flexibility required installation control can be divided into two main groups. Permanent room division There are no plans to utilise the room differently in the future. Several units can be controlled by the same valve, depending on the water velocity and pressure drop. Cooling and heating are controlled in sequence. Flexible room division Each unit is equipped with a valve for each module. A suitable number of actuators for valve control are connected in parallel and are then connected per room to a suitable control system. Cooling and heating are controlled in sequence. Flexible room division is the most common method used to build up a control system and is also the preferred option. Permanent room division Module Module Module Flexible room division RC =Room temperature sensor RG= Controller RC RC =Room temperature sensor RG =Controller RG 9. Stifab Farex room control equipment Stifab Farex offer a number of options tailored to the product range. See separate documentation or contact Stifab Farex. 67
6 PROJECT PLANNING GUIDE Circulated air openings It is important that circulated air openings are fitted in the suspended ceiling for the FLUSHLINE BTBa to obtain the correct circulated air flow. Each metre of FLUSHLINE BTBa requires circulated air openings in the suspended ceiling with a free area of at least.1m 2. Diagram 1. Functional length X l (m) 4, 3,5 3, 2,5 v z =,2 m/s v z =, m/s Functional length (diagram 1) The functional length is a reference parameter based on comprehensive laboratory measurements in a full scale room and many years of experience. The functional length has been developed with the intention of providing planning assistance when placing chilled beams and ceiling units and thereby prevent high air velocity in the occupied zone. The air flow in the functional diagram represents a single row of nozzles. For design D - double row of nozzles, read off the functional length for half the flow, the functional length obtained is then doubled. The functional length with double nozzles at 2 l/sm is read off at 1 l/sm, which gives for v z =. m/s functional length 2 x 1.1 = 2.2 m. Installation spacing Distance from the ceiling To ensure air circulation through the ceiling unit the opening (S) between the ceiling unit and the ceiling/joist should be: S = 5 mm, if the position of the circulated air opening permits circulated air supply from two sides. S = 95 mm, if the position of the circulated air opening only permits circulated air supply from one side. Distance to circulated air openings Place the openings next to the unit s ends if possible. Where this is not possible the circulated air openings should be placed at least half a functional length from the unit s outlet openings. L.5 X l (vz =,2). Distance from a wall The minimum recommended distance between a unit that is placed parallel to a wall is X l, according to the figure to the right. Distance between two parallel units The minimum recommended distance between two parallel units, directed against each other is 1.4 X l according to the figure to the right. Practical experience has shown that the functional lengths are frequently shorter due to the effects of external convection sources (computers, printers, individual loads, etc.) and fixed flow obstacles (luminaires and furniture against the wall and floor) and the room s ceiling height. Stifab Farex has advanced laboratories where we regularly carry out full scale tests on behalf of our customers. Please contact your closest Stifab Farex office for further information. 2, 1,5 1,, Installation spacing (l/sm) distributed on both sides S Distance to the ceiling L L L,5 X l (vz=,2) S = 5mm, circulated air supply from two sides Distance to circulated air openings L X l S = 95 mm, circulated air supply from one side Distance to the wall L 1,4 X l Distance between two parallel units 68
7 TECHNICAL SPECIFICATION Cooling The capacity is measured in accordance with the Nordtest NT VVS 78, using ceiling units with the following dimensions: Length = 3 mm, = 1 l/s m which give q k =.88 l/s. Table 1. Cooling capacity P k (W/m active length), as a function of the primary air flow (l/s, m), mean temperature difference t mk ( C) and the number of active supply nozzles. Shielding refers to the number of deactivated air nozzles evenly distributed along the unit s duct. Accounted capacity applies to the cooling water, the primary air s addition is accounted in table 2. Diagram 2. The function between the cooling effect P k (W), the temperature change t k ( C) and the cooling water flow q k. Table 1. Cooling effect P k (W/m active length), effect variant 1 Primary air Shielding % Design - D, double nozzles (two-way supply) l/sm , 7,5 1, 12,5 15, 3,5 5, 7,5 1, 12,5 3, 5, 7,5 1, 2,5 5, 7,5 1 2 t mk, Temp. difference, room water, C UNITS OF MEASURE P: Effect W, kw t r : Room temperature C v: Velocity m/s q: Flow l/s p: Pressure Pa, kpa t m : Mean water temperature C t m : Temperature difference I t r - t m I C t: Temperature difference between supply-return C t l : Temperature difference, room supply C p: Pressure drop Pa, kpa Supplemental index: k = Cooling, v = Heating, l = Air Effect comparison, Nordtest NT VVS 78 t mk ( C) P k W/m active length Correction for water flow Correction factor 1,1 P k =32,5 t 1, mk (W/m) l =3, m =1 l/sm q k =,88 l/s BTBa Design - E, one-way supply (single nozzles) 7, Design - DE, double nozzles and one-way supply For effect variant 2 the table values are reduced by 17%. Diagram 2. Water flow cooling effect P k (W) t k ( C) = ,,9,8...,4 P corr (W/m)= correction factor P k,5,6,7,8,9,1,11,12q... Re = 3 Re = 6 (q=,39) (q=,78) The unit s active length Horizontal connection from the end (OH/TH): L Act = L Nom 2 (mm) Connection internal horizontal (OI/TI): L Act = L Nom 34 (mm),4,5,6,7,8,9,1,11,12,13,14,15 q k,2,3,4,5,6,65 V (m/s) 69
8 TECHNICAL SPECIFICATION Diagram 3. Pressure drop p k (kpa), in the cooling coil as a function of the cooling water flow q k and the length of the unit. Primary air Table 2. The primary air s cooling effect P l (W) as a function of the air flow and cooling temperature t l ( C). Table 3. The air s natural attenuation L (db) including end reflection. Diagrams 4, 5, 6 and 7. The relation between the pressure drop p l (Pa) air flow and sound level L A (db(a)) with horizontal connection of the supply air. The diagram applies for two-way supply with single nozzles and one-way supply with double nozzles. Diagram 3. Pressure drop water flow cooling V (m/s) q k,2 1,2 1,,15 Length = 1,2 m 1,8 m 2,4 m 3, m 3,9 m,8,6,1,9,5,8,7,4,6,3,5,4,,35,4,5,6, P k (kpa) Table 2. The air s cooling effect P l (W) Air flow t l, Temp. difference room supply ( C) The air s cooling effect can be calculated: P l (W) = 1,2 t l Table 3. Natural attenuation L (db) k 2k 4k 8k Hz db 7
9 Diagram 4. Air flow pressure drop sound level for L = 1.2 m Diagram 5. Air flow pressure drop sound level for L = 1.8 m P t (Pa) Closed Open P t (Pa) Closed db(a) db(a) 35 4 Open BTBa Diagram 6. Air flow pressure drop sound level for L = 2.7 m Diagram 7. Air flow pressure drop sound level for L = 3.9 m P t (Pa) 5 Closed P t (Pa) 5 Closed db(a) 35 4 Open 2 db(a) Open For sound data when shielding, the sound active length is calculated according to the formula: L sound active = L Nominal (1- Shielding (%) ) 1 71
10 TECHNICAL SPECIFICATION Radiant lower section Table 4. Heating effect P v (W) as a function of the mean temperature difference t mv ( C). Diagram 8. The function between the heating water flow q v, the temperature change t v ( C) and heating effect P v (W). Diagram 9. The pressure drop p v (kpa), in the heating loop as a function of the heating water flow q v. Diagram 8. Water flow heating, radiant bottom section P v (W) 1 t v ( C) = Table 4. Heating effect P v (W/m), radiant lower section Heating effect at t mv C,12,2,3,4 q v W,15,2,3,4,5 V (m/s) Diagram 9. Pressure drop water flow, heating radiant lower section v (m/s),5 q v,4 Längd 1,2 m Längd 2 m Längd 3 m Längd 3,9 m,4,3,3,,2,2,15,15,12,1,2,3,4,5,6, P v (kpa) 72
11 EXAMPLE BTBa An office with the dimensions w x d x h = 5 x 4.5 x 3 m has a cooling requirement of 2 W, a heating requirement during the winter of 6 W. The air flow should be 4 l/s. The sound level from the installation must not exceed 3 db(a). Dimensioned room temperatures: summer 24.5 C winter 2 C Cooling water temperature: 13/16 C, t mk = 1 C. Request to place FLUSHLINE in 2 4 rows from the corridor to the facade. DIMENSIONS Horizontal connection Exact lengths for BTBa: Cu Ø 15 x,5 SOLUTION Cooling Supply air that maintains a temperature of 16 C gives 48 W in cooling effect. 233 Cu Ø 12 x 1, BTBa Accordingly, FLUSHLINE should meet 2 48 = 1592 W. Table 1 gives for 2 x FLUSHLINE at a length of 3.6 m with and an air flow of 4 l/s, t mk = 1 C and with an overall length of 7.2 m cooling effect 177 W. Result: 2 FLUSHLINE with a length of 3.6 m (active length L Act = x.2 = 6.8 m). (View: end) Heating With the heating water temperature of 55/45 C ( t mv = 3 C) Table 4 gives an air flow of 115 W/m. 7.2 m FLUSHLINE gives the effect 828 W, which is sufficient to meet the requirement. 6 1 Cooling water With a cooling requirement of 1592/2 = 796 W/unit the required water flow can be read from Diagram 2. A temperature increase of 3 C gives the water flow.63 l/s. The pressure drop is read from Diagram 3, which gives the result 3. kpa per 3.6 meter length. Heating water With a heating requirement of 6/2 = 3W/unit, the necessary water flow can be read from Diagram 8. A temperature drop of 1 C gives a water flow less than.12 l/s. To prevent laminar flow in the pipes it s recommended to establish a flow over.12 l/s, e.g. by lowering the temperature to 6 C or only utilise the heating function on one of the units. The pressure drop is read from Diagram 9. With a length of 36 m and.12 l/s the pressure drop will be 42 kpa. (View: side) Push-in fittings Ø 1 (nipple) Adjustable suspension bracket 4 Sound level Reading from Diagram 7, an air flow of 2 l/s per unit results in a maximum sound level of 3 db(a), if the pressure drop across the unit does not exceed 5 Pa. (View: top) L WEIGHT Weight per meter BTBa: Design A Design AB Dry weight 21 kg/m 22 kg/m Weight filled 21,6 kg/m 22,8 kg/m with water 73
12 SPECIFICATION Ceiling unit system type FLUSHLINE BTBa for cooling and ventilation or cooling, heating and ventilation. The units are supplied enamelled in Stifab Farex white, standard colour RAL 91 max. E = 1. gloss value 3±6. Limits of contract Stifab Farex s limits of contract are at the connection points for water (according to the figure under Project Planning Physical limits of contract). At these connection points RE connects to plain pipe ends, fills the system, vents and carries out a pressure test. VE connects the ducting connections with the dimensions as set out in the diagram on page 49. The units are supplied with suspension fittings (threaded bars and ceiling brackets excluding screws for securing to joists). Specification Product Ceiling unit Flushline BTBa a - bbbb - cccc - dddd - ee Accessories Installation fittings BTBT aaa - bbb Effect: 1 = Effect variant 1 2 = Effect variant 2 Design: A = BTBa basic design with cooling and ventilation. B = with additional radiant heat. C = with additional folding lower section. D = with additional double nozzles. E = with additional one-way air supply. Type: M9S Length: 2, 5, 9 mm Size: 6 = Width at the top edge mm, width at the lower edge 6 mm. Lengths: 1188, 1488, 1788, 288, , 2988, 3288, 3588, 3888 Connection: OH = Horizontal from the end, air and water on same side. TH = Horizontal from the end, air and water on opposite sides. OI = Internal horizontal, air and water on same side. TI = Internal horizontal, air and water on opposite sides. Order examples: Ceiling unit wit two-way air supply, cooling, ventilation and connection OH: BTBa1- A OH. 74
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