2/4/EN/8 Swirl Diffusers Type RFD recommended for use in rooms with ceiling heights of approx. 2.60 . . . 4.00 m TROX GmbH Heinrich-Trox-Platz D-47504 Neukirchen-Vluyn Telephone +49 / 28 45 / 2 02-0 Telefax +49 / 28 45 / 2 02-2 65 e-mail [email protected] www.troxtechnik.com

Contents • Description Construction RFD-Q The application of TROX swirl diffusers has been extended from the comfort conditioning field and has found a significant number of industrial applications. Therefore, to complete the range of FD swirl diffusers which have been so successful, the RFD range has been extended to include smaller diameters. The construction of the diffuser results in a swirling rotational type of discharge of supply air ensuring a high level of induction and rapid reduction in temperature differential. The Swirl diffusers can be used in either constant or variable air volume...

Dependant on requirements of maximum volumetric flow, noise level and installation situation, swirl diffusers are available with or without discharge nozzles. Depending on architectural demands the face can be circular or square. Duct connection details for the type RFD swirl diffuser are shown below. For types RFD-...-UO or RFD-...-UD, the top entry plenum box supplied includes the internal subframe. In this configuration the diffuser face is held in position by a central fixing bolt which has a decorative cap. perforated plate perforated plate perforated plate perforated plate perforated plate...

Construction • Dimensions The face section of the diffuser or side entry plenum box is demountable, held in position by a central fixing bolt. The screw head is covered by a decorative cap. The plenum box can be supplied with a volume control For type RFD-...-D-N (which is only available with discharge nozzle), the plenum box and diffuser face form an integral For simple adjustment of the volume flow, on request the plenum box can be provided with a test connection for measurement of reference pressures and a volume control damper, operated by sheathed cables. The characteristic curve of pressure...

Installation • Fixing Because of their excellent performance, type RFD swirl diffusers can be installed flush with a continuous ceiling or freely suspended (with discharge nozzle). Installation is also possible on stub ducts or suspended above a grid ceiling. For the suspended versions of the top or side entry plenums neck, transition piece and plenum box are fitted with suspension holes resp. suspension lugs. For ceiling panels up to 20 mm thickness, clamp fixing is possible without additional support from the slab ceiling Ensure that the ceiling panels are stable. The diffuser face and side...

Data given: Volume flow per diffuser V = 24 l/s Required: Octave band sound power level of regenerated Diagram 1: Sound power level and pressure drop Effective jet velocity veff: Correction to Diagram 1: Damper angle 1 Sound power level and pressure drop Size 125 Construction with discharge nozzle 2 Sound power level and pressure drop Size 125 Construction without discharge nozzle

Acoustic Data 3 Sound power level and pressure drop Size 160 Construction with discharge nozzle 5 Sound power level and pressure drop Size 200 Construction with discharge nozzle 6 Sound power level and pressure drop Size 200 Construction without discharge nozzle

Acoustic Data Correction to Diagram 7: Damper angle Correction to Diagram 9: Damper angle Correction to Diagram 8: Damper angle H Correction to Diagram 10: Damper angle 7 Sound power level and pressure drop Size 250 Construction with discharge nozzle 8 Sound power level and pressure drop Size 250 Construction without discharge nozzle 9 Sound power level and pressure drop Size 315 Construction with discharge nozzle 10 Sound power level and pressure drop Size 315 Construction without discharge nozzle

Acoustic Data Example Data given: · Volume flow per diffuser V = 30 l/s Supply air temperature differential ͬ t Z = – 8 K Sound pressure level in room L A = 40 dB(A) Room height H = 3.0 m Required: spacing dimensions A x B = 3.20 m x 3.20 m Distance to side wall X = 1.60 Flush installation in ceiling with discharge nozzle. Due to restricted ceiling void, plenum box with side entry spigot is required. Diagram 1: Sound power level and pressure drop RFD-R-D-A /125 L WA = 37 dB(A) ͬ p t = 40 Pa To arrive at room sound pressure level, corrections are required for the number of diffusers and room absorption....

Air velocity at a distance 75 mm from the wall Permitted volume flow ranges see Selection Table Page 6. Diagrams 13 to 16 are applicable to configurations with discharge nozzle. The following corrections should be used for configurations without discharge nozzle: 13 Diffuser arrangement: more than one row 14 Diffuser arrangement: single or more than one row 15 Air velocity at the wall and temperature quotient

Permitted volume flow ranges see Selection Table Page 6. Diagrams 17 to 20 are applicable to configurations with discharge nozzle. The following corrections should be used for configurations without discharge nozzle: 17 Diffuser arrangement: more than one row 18 Diffuser arrangement single or more than one row 19 Air velocity at the wall and temperature quotient

Permitted volume flow ranges see Selection Table Page 6. Diagrams 21 to 24 are applicable to configurations with discharge nozzle. The following corrections should be used for configurations without discharge nozzle: 21 Diffuser arrangement: more than one row 22 Diffuser arrangement: single or more than one row 23 Air velocity at the wall and temperature quotient

Permitted volume flow ranges see Selection Table Page 6. Diagrams 25 to 28 are applicable to configurations with discharge nozzle. The following corrections should be used for configurations without discharge nozzle: 25 Diffuser arrangement: more than one row 26 Diffuser arrangement: single or more than one row 27 Air velocity at the wall and temperature quotient

Permitted volume flow ranges see Selection Table Page 6. Diagrams 29 to 32 are applicable to configurations with discharge nozzle. The following corrections should be used for configurations without discharge nozzle: 29 Diffuser arrangement: more than one row 30 Diffuser arrangement: single or more than one row 31 Air velocity at the wall and temperature quotient