Jet Fan Systems. Tailored solutions for car park ventilation

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1 Fans Air Handling Units Air Distribution Products Fire Safety Air Curtains and Heating Products Tunnel Fans Jet Fan Systems Tailored solutions for car park ventilation

2 Car park ventilation the principle Basics Jet fan systems are active systems offering a cost effective solution to ventilate and extract smoke from enclosed or underground car parks. This ductless ventilation system provides either normal ventilation and can also be provided for smoke extract in case of emergencies, or a combination of both, i.e. a dual purpose fan. n ef cient system re uires good planning, starting with the physical dimensions of the car park, considering the pattern of utilisation as well as peak loads. Ventilation rates are mostly based on an air exchange rate (pollution), or on a rate multiplied with the number of parking spaces. This is de ned in the appropriate local building regulations, de ning normal ventilation and emergency ventilation. The typical system includes the jet fans and main exhaust air fans, eventually supply air fans, should the openings in the building (entrance, ramps etc.) not be suf ciently si ed. n addition, a control system with carbon monoxide detectors and or heat smoke detectors is re uired to operate the system effectively. A jet fan system offers the ventilation on demand principle also for car parks depending on the measurements of the CO detectors. Jet fans can be individually controlled, or grouped together in re ones. n re mode, after a pre-set standstill escape period, the jet fans will run at full speed to uickly and effectively clear the smoke. Bene ts The space saving design, compared to standard duct based ventilation systems, offers a variety of bene ts t is possible to ventilate or extract smoke in particular sections of the car park. CO (carbon monoxide) detectors and smoke sensors ensure that only fans in polluted areas are activated and the fans are switching into smoke extract mode immediately when a re starts. No expensive, bulky and complex duct systems, making it an ideal solution also for renovations. Car park design is more attractive. mproved air uality in underground car parks compared to conventional ducted systems (mixture of all layers of air within the car park). Optimum safety is provided in case of a re in the car park. apid smoke extraction, smoke cooling, limited smoke spread, i.e. a better smoke control. Jet fan systems for smoke extract prevent costly conse uential damages in case of a re the ceilings are subjected to less heat, and smoke is uickly removed from the building. ore exible in positioning when the parking area in the car park is redesigned. Energy saving in exhaust air fans due to reduced system resistance (no duct systems). educed installation and running costs. Control system A control system is re uired, which is tailored to handle the re uirements of the speci c project for ventilating and smoke extraction. As a rule car park ventilation is based on 6ACH for normal ventilation and 10ACH for smoke extract according to international standards. n ndia national building code (N C) ask for 12ACH for normal ventilation and 30ACH for smoke extract. A good control system saves energy by reducing the ventilation rate with the help of CO sensors, depending on the car park usage, increasing ventilation rate only in peak hours and operating the jet fans only selectively, according to demand. When used for smoke extract, the system has to work on a re detection system (heat or smoke detection). n car parks with different levels, the system has to run the jet fans full speed on the re level, and simultaneously switch off the fans in all other levels. The main exhaust air fans are switched to full speed. The control e uipment regulates the main supply and/or exhaust fans together with the jet fans, both depending on the signals coming from the sensors.

3 Tailored solutions CFD simulation A C simulation is needed to con rm that there is enough air movement in all areas of the car park to secure the re uired number of air exchanges, to con rm the proposed number of jet fans and to determine the location where the jet fans have to be installed. n order to be able to perform a C analysis, it is essential to have a 3-D model of the building site, giving all openings, slab height, surface of the ceiling ( at or with drop beams, etc.) and all other details in 2-D autocad format re uired to carry out a simulation. A CFD analysis is used to simulate the air ows, to ensure that the distribution of the air is suf cient to effectively ventilate the car park under normal conditions as well as in emergency situations. Systemair offers this service meaning everything from one source and rsthand truly tailored solutions. Systemair range Jet fans The Systemair jet fans are e uipped with adjustable aluminium impellers and EC standard motors, available for ambient temperatures for CO exhaust (between 40 C and 60 C) or for high temperature smoke exhaust (300 C/2h) applications. Certi cation in accordance with EN Two speed high temperature fans can also be used for normal CO extract ventilation (dual purpose fans). Three si es (31, 3 and 400 mm impeller diameter), circular or octagonal design. Also available with fully reversible blade settings (on re uest). Fan casings and outside sheet for fan housing manufactured from hot dip galvani ed sheet and silencers manufactured from pre-galvani ed sheet. Pre-wired terminal box manufactured from thermoplast in ambient temperature version, from aluminium in high temperature version. Easy access at the outer fan casing. Silencers with integrated inlet cones and guide vane to straighten the air ow. Sound attenuating material non-in ammable in accordance with D N 4102, corresponding with E guideline 97/69. Protection guards on inlet and outlet, manufactured from galvani ed steel. Mounting brackets manufactured from galvani ed steel, for safe and easy ceiling suspension. De ector/guide vane on the outlet side.(available as an accessary on re uest) Control system With active motor protection in ambient temperature mode, with individual and grouped failure signal. n case of re motor protection is being deactivated. Each fan is controlled by an individual control- and power unit. Possibility to have auto-changeover to a standby fan, should one of the main fans fail. The Systemair control modules and regulation systems correspond to VD guideline 20 3, D N/VDE 0660, D N/ VDE and D N/EN The concept has been approved by TÜV, the modules are CE-labelled.

4 Safety requires individual planning CFD simulations CFD simulation Systemair offers assistance in the planning and design of Systemair Jet Fan Systems. Section velocity vectors On re uest and against a fee, which will be reimbursed when ordering the project with Systemair, we can provide CFD (computational uid dynamics) simulations, assisting in selecting the number, si e and positioning of the fans, and giving all information re uired for your speci c project. Checklist Detailed information is re uired regarding the building site. Please ask for the Systemair checklist for jet fans and CFD-analyses. n uence of drop eams Mean age of air

5 Jet fan systems Systemair range Systemair jet fan range covers two fan designs Jet fan AJ (unidirectional) respectively J (reversible, available on re uests) in circular version, and where space is limited, jet fan AJ (unidirectional) or J (reversible, available on re uests) in octagonal casing with minimum height of 36 mm. The jet fans have either adjustable aluminium blades, or fully welded steel impellers. oth designs are available for standard temperature applications as well as for high temperature applications (F300 = 300 C/2h). AJR/RJR circular version: Available in three si es (31, 3 and 400) Jet fan casing manufactured from hot dip galvani ed steel with anges on both ends Fan code A R J HT(F300) Pre-wired terminal box mounted at the outer fan casing Two circular silencers, manufactured from galvani ed steel, length 900 mm Two galvani ed steel inlet outlets cones each side Protection guard at the inlet side Mounting brackets for ceiling suspension Guide vanes to direct the air o are avai a e on re uest as accessories or oth designs. High temperature version (F300) 2-pole motors mpeller diameter Jet fan round casing A - unidirectional - reversible Octagonal jet fan AJ8

6 Approved safety Aerodynamic and acoustic measurements Systemair jet fans have been, during development aerodynamically and acoustically tested on an AMCA rated Systemair test rig in Systemair technical center. Temperature and differential pressure The high temperature test is in accordance with the latest EN standards. The tests were made with air ow from motor to impeller. erod na ic easure ent coustic easure ent

7 Control system t e system on r t on 1. Power supply: 1. Power supply Switching cabinet, designed for total power consumption or for total absorbed current. 2. Main fans: 2. Switching and control unit for main fans (dimensioned according to number of fans, absorbed power of fans, wiring and start-up, reversibility). Inlet fan/extract fan Inlet fan/extract fan n 3. Jet fans: 3. Switching and control unit for jet fans (dimensioned according to number of jet fans, absorbed power of jet fans, wiring and start-up, reversibility). Jet fan Jet fan n 4. Central control unit: 4. Central control unit (one modul per ventilation/smoke one, con gurated according to functions). Smoke extract/ventilation section Smoke extract/ventilation section n 5. CO-alarm signal input: 5. CO-alarm signal input (CO-alarm system not included) 6. Input for accessories: 6. Accessories (optional) over ride panel for re brigade, smoke detectors, acoustic signals, illuminated alarm boards,

8 Control system Modular control system, adapted to the project requirements. To control fans for ventilation and smoke extract in underground car parks, equipped with main supply/extract fans, jet fans and sensors. Jet fan module Clearly laid out concept, functionality approved y T /S d ermany. Single or two speed fans, unidirectional or reversi le can e controlled. Each jet fan is allocated to an individual control module. For service and initial operation each jet fan can e manually activated. Central control unit with control panel In normal ventilation mode the system is eing switched depending on CO alarm systems, on timers or input from central uilding control systems. The fan operates either in high or in low speed, in the selected direction of rotation. In re mode the system is eing switched depending on the re detection system. irtual smoke extract ones can e formed, having different directions of smoke extraction. All fans activated in the smoke extract zone will automatically run in the pre-set fan speed and direction of rotation. The uilt in over-current protection of the motor is deactivated. The fan runs until it is mechanically destroyed y the re.

9 Checklist for offers for Jet fans / CFD-analyse Project: Customer: Simulation Type 1. Supply air mechanical natural If mechanical, then ll in: Air volume m /h Location(s) supply air fan(s) in drawing Corresponding drawing ( le name, format) Number of fans If natural, then ll in: Si e(s) in m and location(s) of the openings in the drawing Corresponding drawing ( le name, format) 2. Exhaust air mechanical If mechanical, then ll in: Air volume m /h Location(s) exhaust air fan(s) in drawing Corresponding drawing ( le name, format) natural If natural, then ll in: Si e(s) a x b in m and location(s) of the openings in the drawing Corresponding drawing ( le name, format) Number of Fans 3. Car park e uired air exchange rate ACH asement Details 4. Jet fan speci cation Medium temperature/time C/ h To be used for Air volume jet fan m /h Outlet velocity jet fan m/s Thrust N Two speeds 100/ 0 eversible Smoke extract yes yes CO-extract no no 5. Required drawings elevant oor plans of the car park Plan ( le name, format) elevant sectional drawings of the car park Plan ( le name, format)

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