PRODUCT BROCHURE Fixed Helical Swirl Diffuser HSC-FD HSC-FD : 07 smartemp.com
DESCRIPTION The SMARTEMP Fixed Helical Swirl Diffuser, type HSC-FD, produces highly inductive swirl discharge, diffusing the supply air stream radially with fixed horizontal discharge and strong mixing characteristics into the space. The patent pending design delivers high levels of draught-free comfort well suited to both constant volume or VAV applications, inclusive of low temperature or cold air supply air systems with a minimum supply-to-room temperature differential of - K including turndown to approximately %. Helical Twist The diffuser comes standard with a square face (figure ), or may optionally be ordered with a round face. The cambered leading edges of the twenty off-set radial vanes reduce the sound power level and pressure drop, improving aural comfort and saving fan energy. Cambered Leading Edge The vane tips feature helical twist (figure ) that reduces pressure drop, allowing the airflow rate to be increased, thereby reducing the number of diffusers required in the space. This unique feature also reduces the minimum Figure Fixed Helical Swirl Diffuser HSC-FD : 07 Figure
CONSTRUCTION - M Rivet Nut - Spigot - Connection Box - M Thread Rod - Reducer (Optional) - HSC-FD Swirl Diffuser 7 - Perforated Face (Optional) permissible VAV turndown to % at - K cooling or % at - K (based on Pa maximum total pressure) and enhances stable operation under low supply air temperature conditions. The HSC-FD diffuser may be flush mounted in a ceiling or freely suspended (ie no Coanda attachment to the ceiling required). Typical discharge height ranges from.0 to. m, depending on diffuser size and airflow. 7 The highly inductive swirl discharge benefits heating performance by strongly diluting supply air with cooler room, thereby diminishing supply air stream buoyancy. The maximum recommended differential between supply air and room air is a function of diffuser size, discharge height and airflow rate. The HSC-FD swirl vanes form a flush surface with the surrounding flat diffuser face, which may be square or round, and which may be optionally screened by a perforated face. The diffuser is made of powder coated steel and is available with nominal neck diameters of 0 mm, mm and 00 mm. Optional reducers are available to reduce effective neck size for decreased airflow rates. Reducers Reducers can be inserted into the neck from behind, Figure reducing the effective neck size to suit reduced airflow rates, especially in low air quantity VAV applications (figure ). Reducers allow a largely uniform diffuser aesthetic to be achieved by enabling the use of a common diffuser size even where airflow rates between diffusers vary widely. The ability to simply change reducer size also provides future-proofing for refurbishment and fit-out changes. Five reducer sizes are available for size DN00 and six for size DN. Fixed Helical Swirl Diffuser Reducers are not available for size DN0. HSC-FD : 07
Discharge Pattern Segment covers that blank one half, two opposed quarters, or one quarter of the diffuser vanes are available to reduce the discharge pattern from 0 to 80 (-way asymmetrical), or x 90 (-way symmetrical), or 70 (-way) so as to allow for diffuser placement in corners, in corridors, or close to a wall, respectively (figure ). Segment covers reduce the diffuser airflow rate. Segment covers may be used in combination with reducers where further airflow rate reductions are required. Reducer Mode of Operation The highly inductive swirl discharge of the HSC-FD produces rapid discharge velocity decay as the total supply air stream mass flow rate increases due to strong entrainment of secondary air from the room into the primary air stream. Effective air changes per hour are increased. Consequently, at any given airflow rate, the HSC-FD swirl diffuser is suitable both for long throws (due to the high momentum of the supply air stream) as well as short throws (due to the air stream's low velocity) making it an extremely adaptable diffuser, well suited to a broad range of applications and fit-out changes. Strong dilution of the supply air stream with large quantities of room air provides rapid supply air stream temperature equalisation and hence density equalisation with room air, preventing cold air dumping in summer and minimising warm air stratification in winter. The resultant low velocity room air motion with uniform temperature distribution throughout the occupancy space produces high levels of thermal comfort (no cold and draughty or hot and stagnant spots). x x a: -way asymmetrical blow Figure x s: -way symmetrical blow Centre-line spacing to wall: DN x DN x Figure x w: -way blow Fixed Helical Swirl Diffuser HSC-FD : 07
TECHNICAL DATA - HSC-FD-C - circular face - HSC-FD-S - square face - Foam connection box with magnetic fasteners - Threaded rod - Cap D H D H DN D E Nominal diameter DN DN 0 DN DN 00 ) Volume flow rate Dimensions in mm Weight in kg V[L/s] V [L/s] V[L/s] ) Ceiling grid Reducer size Ø D E H H D D Connection T=- K T=- K with perf. T=-0 K Air Outlet Box ) 00 0-08 7-08 9-9 99 9 0 70.. 0-8- 0-0 0 8-9 -9 8-7 99 00 0-8 -8 7-9.0-0- 8-9 0 7 9 00 to.8 00-90 0-90 -8 99 9.0 - - 8-.7-0- -0 9 0 0-9 9-9 98-8 99-89 8-89 7-0 99.7 00 9-80- 8-7 9 0 0 70 to 7. 7-9 -9 8-9.7. 7-8 0-8 0-0 99 9- - -0 ) Vmax based on Pa maximum Total Pressure. ) Larger sizes available on request. ) Perforated face adds db and increases pressure loss by 0%. Products supplied may differ slightly from those described in this technical brochure due to on-going product development. Fixed Helical Swirl Diffuser HSC-FD : 07
NOTES TO NOMOGRAMS ON PAGES & 7 Comments / Nomogram valid for: Adjustments: 0 discharge pattern (-way blow). For 70 discharge (-way blow): Multiply actual airflow rate by. to determine performance from nomogram. T +ve denotes heating. For 80 or x 90 discharge (-way blow): Multiply actual airflow rate by to determine performance from nomogram. Heating valid for 00% high-level return. For low-level return: Tmax.heating ( + (LRA%)/00) Tmax, where LRA% = % low level return. Valid for discharge from closed ceiling. For freely-suspended diffuser: Heating Tmax.freely suspended Tmax.heating /. Total pressure (Pt) is inclusive of side-entry connection box pressure loss. For height.7 m select.7; otherwise select height twice (once in the grey zone; once in the white zone). T -ve denotes cooling. Minimum spacing between two diffusers (Cmin) is to be halved for spacing to walls or glazing. 7 T -ve denotes cooling. Maximum spacing between two diffusers (Cmax) is to be halved for spacing to walls or glazing. Determine Cmax twice (once based on cooling T; once based on discharge height), then select the lower of the two outputs. 8 Select desired comfort level to determine minimum and maximum spacing (Cmin & Cmax) and minimum discharge height (Hmin). 9 Hmin for discharge from closed ceiling. For freely-suspended diffuser: Hmin.freely suspended Hmin. Sound pressure level LP [NC] is valid per diffuser in a standard commercial office only with a.7 m to m ceiling. LP should not be used for spaces other than offices, but should, instead be calculated by an acoustical engineer. Thermal Comfort Guide: ADPI 9%: Premium comfort sedentary activity, such as in auditoria. ADPI 90%: High comfort near-sedentary activity, such as in board rooms, high end offices and libraries. ADPI 80%: Good comfort near-sedentary activity, such as in open-plan offices and meeting rooms. ADPI 70%: Standard comfort medium activity, such as in transient spaces, retail and lobbies. Fixed Helical Swirl Diffuser HSC-FD : 07
HSC-FD-DN0 & DN-R0 to R m /h 800 700 00 00 00 00 00 00 0 L/s 0 0 00 80 70 0 0 0 00 90 80 70 0 0 0 0 0 0 Heating Tmax [K] 0 L/s/m Reducer 0 DN0 Pt Total Pressure, Pt [Pa] 0 [Pa] 0 0 0 0 0 +0 K H = m Cooling T = -8 K - K +8 K + K.7 m - K + K m + K + +0 K +8 K + K m + K + K m 0 K ADPI 9%; ṽ 0.0 m/s: Cmin [m]. Hmin [m] DN0 DN 0 DN0 Cooling... H = m. DN0 LW LP*.7 m 7 m 0 Cooling T [K] = Sound Power, LW [db(a)] Sound Pressure, LP [NC]* 9 0 7 0 [db(a)] 0 9 [NC] H =..7.0. m - K.7 Cmax 0 [m] 0 - K -8 K ADPI 90%; ṽ 0. m/s; DR 0% @ T= C: 0.8....... 0 7 0 ADPI 80%; ṽ 0.9 m/s: ADPI 70%; ṽ 0. m/s; DR 0% @ T= C: Notes: * Based on 0 db room absorption. 0.7 0.....0. 8..... 0 0 0 0 0 REFER TO NOTES ON PAGE. 8 Fixed Helical Swirl Diffuser HSC-FD : 07
EXAMPLE: HSC-FD-DN-w in an office Determine the performance parameters of an HSC-FD-DN with no reducer operating at 8 L/s and incorporating a blanking segment to produce a 70 discharge pattern (-way blow) from a.7 m high closed ceiling, supplying L/s/m to a premium office with 00% high-level return air. The supply-to-room temperature differential when cooling is - K. Due to the 70 discharge pattern, multiply the actual airflow rate of 0 L/s by., providing 70 L/s for input into the nomogram. Select no collar (Reducer 0). Select.7 m discharge height and L/s/m specific airflow, resulting in a maximum heating temperature differential ( Tmax) of + K. The total pressure (Pt) is 0 Pa, inclusive of side-entry connection box pressure loss. Select.7 m discharge height, which is common to both the grey zone and the white zone. Select - K cooling. 7 Select - K cooling and.7 m discharge height. 8 For a premium office, select ADPI = 90%. The minimum recommended centre-line distance (Cmin) between two adjacent diffusers is. m; and hence. m to walls that the diffuser discharges towards. The minimum recommended discharge height (Hmin) is. m. The maximum recommended centre-line distance (Cmax) is m (ie the lower of m for.7 m discharge height and 7 m for - K cooling); and hence 8 m to walls that the diffuser discharges towards. 9 The A-weighted sound power level (LW) of the diffuser is 7 db(a), producing a sound pressure level (LP) of NC in the space (based on 0 db room absorption). Fixed Helical Swirl Diffuser 7 HSC-FD : 07
HSC-FD-DN00 m /h 00 00 00 000 800 00 00 00 80 +0 K +8 K + K + K + K +0 K +8 K + K + K L/s 80 0 00 0 0 80 0 00 80 0 0 0 00 80 0 0 0 Heating Tmax [K] 0 L/s/m + K 0 K ADPI 9%; ṽ 0.0 m/s: Reducer 0 Pt m - K m m Total Pressure, Pt [Pa] 0 [Pa] 8 0 0 0 0 0 H = m.7 m Cooling T =. [m] 8 Cmin 0-8 K - K Cooling - K 7.0 Hmin [m] Cmax [m]... H = m.7 m LW LP*.7 m 7 Cooling T [K] = 0 Sound Power, LW [db(a)] Sound Pressure, LP [NC]* 9 0 8 0 0 9 H =..0 [db(a)] [NC].0.0 m 0 0 0 - K -8 K ADPI 90%; ṽ 0. m/s; DR 0% @ T= C:..... 0 0 0 0 ADPI 80%; ṽ 0.9 m/s: ADPI 70%; ṽ 0. m/s; DR 0% @ T= C: Notes: * Based on 0 db room absorption. 0.8 0.7...... 8.... 7 0 0 0 0 0 0 0 0 0 REFER TO NOTES ON PAGE Fixed Helical Swirl Diffuser 8 HSC-FD : 07
EXAMPLE: HSC-FD-DN00 in an auditorium Determine the performance parameters of HSC-FD-DN00 diffusers with no reducer, each freely suspended at m height and discharging 0 L/s, supplying L/s/m to an auditorium with 00% high level return air. The supply-to-room temperature differential when cooling is - K. Select 0 L/s for input into the nomogram. Select no collar (Reducer 0). Select m discharge height and L/s/m specific airflow, resulting in a maximum heating temperature differential ( Tmax) of + K. As the diffuser is freely suspended, Tmax.freely suspended Tmax.heating /. +.7 K, based on 00% high level return air. (Even 00% low level return air will only increase Tmax.freely suspended to +. K, which is not sufficient for heating. Consider using the Smartemp HSC-AD instead if heating is required.) The total pressure (Pt) is 8 Pa, inclusive of side-entry connection box pressure loss. Select m discharge height twice (once in the grey zone; once in the white zone). Select - K cooling. 7 Select - K cooling and m discharge height. 8 For an auditorium, select ADPI = 9%. The minimum recommended centre-line distance (Cmin) between two adjacent diffusers is 7.0 m; and hence. m to walls. The minimum recommended discharge height (Hmin) is. m. The maximum recommended centre-line distance (Cmax) is m (ie the lower of m for - K cooling and m for m discharge height); and hence m to walls. 9 The A-weighted sound power level (LW) per diffuser is 8 db(a). As this is a large volume auditorium (and not an office, which typically has approximately 0 db room absorption) the sound pressure level (LP) based on 0 db room absorption should not be used (ie only LW should be provided for acoustical calculations). Fixed Helical Swirl Diffuser 9 HSC-FD : 07
FEATURES Tsupply-room - K (cooling); + K (heating), depending on application. Well suited to low temperature VAV systems with minimum Tsupply-room = - K including turndown to %. Discharge height:. m to. m. Diffuse airflow from fixed stable horizontal swirl discharge pattern for high thermal comfort. 0 off-set radial vanes flush with flat diffuser face. Diffuser face may be square or round. Optional perforated screen. For installation substantially flush with suspended false ceiling or freely suspended. Vanes with cambered leading edges to reduce both noise and pressure drop. Helical twist vane tips for increased airflow rate range of operation. Available in neck sizes: DN0; DN; DN00. Low sound power level and pressure loss. Suitable for high airflow rates. Optional reducers for low airflow rates (DN and DN00 only). Segments covers (/; / opposed; /) for diffuser placement near walls, in corridors or in corners. Diffuser made of powder coated sheet metal. Central optional threaded rod fastener with flush cap. Optional foam connection boxes, including magnetic perimeter edges and central connection nuts, stackable for storage and transport. Fixed Helical Swirl Diffuser 0 HSC-FD : 07
ORDER DETAILS HSC-FD-DN - -R - -P - - CONNECTION TYPE: - 0* = No connection box. - KF = Thermally insulated foam connection box with magnetic fastener & blanking cap. - KFR = As for KF plus threaded rod fastener and cap. SURFACE FINISH: - 900* = Face powder coated to RAL 900 (Signal White). - 900* = Face powder coated to RAL 900 (Jet Black). - = Face powder coated to RAL. FACE FINISH: - 0* = No perforated face. - = Perforated face. DISCHARGE PATTERN: - w* = No blanking segments. - w = / blanking segment for diffuser adjacent to wall. - s = / blanking segments for diffuser in corridor. - a = / blanking segment for diffuser in corner. REDUCER: - 0* = No reducer - = Reducers to for size DN. - = Reducers to for size DN00. FACE SHAPE: - S*= Square face with 90 turn-up for coffered ceilings: - 9 mm* for size DN0; - 9 mm* ( mm to 0 mm [.7 ] available) for size DN; - 9 mm* to 0 mm [.7 ] for size DN00. - C = Circular face with flush contact edge ( mm / 0 ) for closed false ceilings: - Ø mm* for size DN0; - Ø 00 mm* for size DN; - Ø 70 mm* for size DN00. NOMINAL DIAMETER: - DN0 = Nominal neck diameter 0 mm. - DN = Nominal neck diameter mm. - DN00 = Nominal neck diameter 00 mm. MODEL: - Helical Swirl Ceiling - Fixed Direction Note: * Standard, if no type code entered. Products supplied may differ slightly from those described in this technical brochure due to on-going product development. Fixed Helical Swirl Diffuser HSC-FD : 07
TENDER TEXT Furnish and install SMARTEMP Fixed Helical Swirl Diffusers, type HSC-FD, to provide diffuse airflow with fixed stable horizontal swirl discharge pattern for the provision of high thermal comfort. Each diffuser is to be made of powder coated steel and shall include 0 off-set radial vanes flush with the flat diffuser face. The diffuser shall be installed complete with a flush colour matching central cap and shall be suitable for central threaded rod connection. The diffuser face is to be square or round, as specified, and is to be fitted with the optional perforated screen where indicated. The diffuser is to be installed substantially flush with the suspended false ceiling or freely suspended, as specified. Swirl vanes are to include cambered leading edges for reduced noise and pressure drop, and helical swirl vane tips are each to have geometric twist to increase the airflow rate range of operation. Diffuser neck size is to be DN0, DN or DN00, as appropriate. Fit optional reducers where low airflow rates are required (DN and DN00 only). Install the diffusers at a discharge height of. to. m. For VAV applications, operate each diffuser within an airflow rate band turning down to no less than % at a Tsupply-room - K. For heating applications, observe Tsupply-room recommendations. Install segments covers (/; / opposed; /) for diffuser placement near walls, in corridors or in corners. Connect each diffuser to SMARTEMP foam connections boxes, suitable for perimeter magnetic and/or central threaded rod connections, as specified. Fixed Helical Swirl Diffuser HSC-FD : 07