CONSTANT AIR FLOW CONTROLLER

Transcription

1 Hamuliakovo 277 The Slovak Republic Tel.: /2 / Fax: /2 / CONSTANT AIR FLOW CONTROLLER IMOS - RPK TECHNICAL SPECIFICATIONS This product is protected by industrial design pattern filed by UPV SR TPI 33-02

2 These specifications define the size, properties, application range and construction features of RPK constant air flow controllers. The specifications apply to designing, ordering, manufacturing, acceptance, delivery and use of these products as of 1 st January I. TERMINOLOGY The constant air flow controller is an air-engineering device that maintains constant volume air flow within fluctuating pressure range without any subsidiary energy source. The jacket of the controller is a component providing for air flow, attachment to the remaining parts of the air-engineering system and fixation of functional control device elements. The controller blade represents the functional surface of the control and adjustment apparatus. The adjustment apparatus serves for setting the required constant air flow according to the scale installed. The absorber is a stabilising component of controller apparatuses that is active during sudden mode changes in primary tubes. The controller cover is a part of the controller protecting its functional parts. II. GENERAL SPECIFICATIONS The constant air flow controller, hereinafter referred to as RPK, is an air-engineering device which can be used in systems where certain operational modes can generate fluctuating currents in spite of the requirement that behind the controller installation point constant air flow is needed. The RPK controller needs no energy supplies for its operation and is characterised by small dimensions, high controlling accuracy and simple installation providing for a direct connection with the tube. In addition, no maintenance is required. The controller is designed for indoor operation without direct weather influences at temperatures from -20 to 80 C, pressure difference up to 600 Pa and relative humidity up to 80%. We recommend maintaining air flow velocity between 2.2 to 10 m.s -1. The controller starts its operation according to its nominal size and the regulated amount of air when the minimum pressure difference between the front and rear part of the controller reaches 35 to 55 Pa. The control of larger air volumes requires a higher difference in pressure. Using this constant air flow controller, air-engineering equipment designers have a device at their disposal that needs no energy supply while providing for the parameters designed. Picture of the Constant Air Flow Controller Fig 1 RPK Constant Air Flow Controller 1 TPI 33-02

3 Description RPK constant air flow controllers enable to control specifically required air volumes in individual branches of airengineering systems. The user can set the required constant volume by turning the screw positioned on the right side of the cover and positioning the indicator mark against the respective scale mark. The internal setting of constant outflow air volume proceeds through the movement of the air put to the controller blade, which is transmitted to a special spring. Construction Features of the Constant Air Flow Controller The standard manufacturing version of RPK includes the jacket and other sheet-metal parts made of zinc-coated construction steel sheets. Similarly, all metallic components are zinc-coated to protect their surface from outer influences. The special spring is zinc-coated, made of high-quality flexible steel. Special bearings fit for a wide range of temperatures need no greasing. Depending on the customers' wishes, the RPK controller can also be made of stainless steel (except for bearings and the special spring) and the outer surface of the controller can be treated with dry colour of any RAL class hue. Product ordering The order must include the following information: sesignation: RPK constant air flow controller RPK size made of stainless steel STA surface finish RAL XXX - XXX - XXX - RAL... ordering example RPK STA 2 pieces TPI RPK RAL pieces TPI Product specifications The product has a label attached to it including the following information: a) name and registered office of the company b) product designation c) nominal dimension d) quality inspection record e) air flow direction 2 TPI 33-02

4 III. TECHNICAL SPECIFICATIONS The nominal dimensions of individual controllers, their lengths, speed and flow rate ranges, installation dimensions and weight specifications are specified in the figures and tables attached. Overall weight data are specified with ±5% tolerance. Fig. 2 RPK Technical Specifications Tab. 1 Main Parameters of the RPK Constant Air Flow Controller *- special production on specific order: 3,6-10,4 m.s -1, m 3.s -1 3 TPI 33-02

5 Tab. 2 Acoustic Performance Values Generated by Air Circulation with the RPK Device Chart 1 Minimum difference of static pressures in the flow controller 4 TPI 33-02

6 Explanatory notes: * [m 3.h -1 ] - air flow through the controller * [± %] - accuracy of the pre-set air flow through the controller v [m.s -1 ] - average air speed through the controller p p [Pa] - pressure loss caused by the controller f m [Hz] - octave spectrum frequency L W [db/okt.] - acoustic performance value IV. EXAMPLE OF SELECTING THE AIR FLOW CONTROLLER Chart 2 Quick Selection of RPK Type There is one system with variable air flow and a room into which the constant air volume must be transported m 3.h -1. Maximum allowed noise level in the room is 50 db(a) and maximum pressure difference on the controller is 250 Pa. The average absorptance of the room α=0.15 and the absorption of the room is 8 db. - the preliminary selection of the controller size will be made using Fig. 4. next, air circulation velocity will be calculated - 4,0 m.s -1 - noise parameters must be checked using Tab. 2 f m [Hz] noise of the controller room absorption correction for A balance filter resulting noise level L PA = 44 db(a) The flow controller can be accepted supposing that the noise of the system in front of the controller and the noise of the distribution element both comply with the required noise parameters of the room. 5 TPI 33-02

7 V. INSPECTION, ACCEPTANCE AND WARRANTY The inspection of product completion and quality is performed by the manufacturer. All RPK controllers are checked for functionality and, if required in advance, pre-set to specified values. Product parameters are verified according to inspection regulations and the acceptance of the product is performed in accordance with valid ASEK s.r.o. company regulations. The RPV constant air flow controller is supplied in the assembled state. The manufacturer provides a 12-month product warranty valid from the installation date with the maximum warranty of 18 months since the shipment date. VI. INSTALLATION AND MAINTENANCE The installation of the controller in the tube is made by usual installation methods used for air-engineering elements. Before installing, the tube opening designed for controller tails to be inserted must be checked. During the installation process, the controller jacket must not be damaged because it could block and disable the controller blade. The controller can be installed in horizontal, slanting and vertical tubes but the blade rotation axis must remain in a horizontal position. The device must be installed in a correct orientation to ensure air inflow from the side nearer to the controller blade. According to the controller size, the controller should be mounted to the tube using φ3.2 x 13 to φ3.9 x 16 studs or equally-sized clenches. Finally, the joint should be sealed with a sealing tape. After finishing the installation process, you should set the flow volume by turning the setting screw with its head protruding on the right side of the cover. The required constant volume is set by turning the setting screw - clockwise rotation increases the value being set while it is decreased by anticlockwise movement. If you install the controller, you should provide enough space to access the setting screw. You should also take care to prevent the bearing body standing out from the controller jacket from touching other elements. To enable a failure-free operation of the regulator, you must firmly fix the tube and the flexible hoses attached to it. The influx part of the tube must be cleared from impurities. During its period of service, there is no need to perform any maintenance of the controller. For this reason, the access to controller elements is completely blocked. Fig. 3 RPK Installation Procedure 6 TPI 33-02

8 VII. PACKING, SHIPMENT AND STORAGE RPV products are shipped in cardboard packages. When ordering large amounts of controllers, you can contract special conditions of their packing, arrangement on paletts and transport. Customers are advised to abide by environmental regulations and collect used packages for recycling at their own expense. Controllers are shipped by common means of transport at the customer's expense. It is recommended that you store RPK products indoors and in a dry place. VIII. PRODUCT EXAMINATIONS The manufacturer constantly examines the quality of its products supplied. RPK products comply with legal regulations concerning product examination and certification. IX. APPENDIX Any adjustments to the specifications presented here must be discussed with the manufacturer. The manufacturer reserves the right for technical innovations and is not obliged to announce these changes in advance. Related standards:stn CR Ventilation for buildings. Terminology. STN EN 1505 Ventilation for buildings. Sheet metal air ducts and fittings with rectangular cross - section. STN EN 1506 Ventilation for buildings. Sheet metal air ducts and fittings with circular cross - section. 7 TPI 33-02