Demand Controlled Ventilation - With the windows shut! BMS DATA LO GG ER For consistently good indoor air quality AHUs Scan to visit website Rev: 3.0-09/2016
BMS DATA LO GG ER AHUs Welcome to AirMaster ventilation! By any standards, AirMaster is a game-changer in the field of ventilation. It s duct-free air distribution and remarkably low noise emission have caught the attention of architects, M & E designers and consultants. Many different ideas have come together to create this new approach to direct ventilation. For ease of reference, the main features of an AirMaster air handling unit have been signposted on the page opposite. Further details are given on the page numbers indicated. There are over 16,000 AirMaster units installed across several countries in northern Europe. These installations are both new-build and retrofits. Within the UK, there are applications in: Facilities for children with Special Educational Needs (SEN), where low noise profiles are necessary. Retrofit ventilation for offices which cannot readily be connected to centralised ducted systems. Classrooms adjacent to well-used roads, where open windows are out of the question. AirMaster units are versatile, energy efficient and easy to install. The product line is kept at the leading edge of technology by a well-resourced R & D programme. We hope that you enjoy reading this introductory brochure. If you have any questions, please contact us using the details given on the back cover. AirMaster ventilation The shape of things to come! AirMaster ventilation pathways 2
AirMaster at a glance Low Noise: only 35dB(A) @ 1m (Page 7) Good Indoor Air Quality with the windows shut (Page 4) Demand Control links Fan Speed to Room CO 2 Content (Page 4) 49dB Attenuation of external noise (Page 7) CO 2 or PIR Control Reduces OPEX (Page 13) Duct Free Air Distribution (Page 9) Recovers 82% (Dry Bulb) of heat contained in Extract Air (Page 5) Easy to Install in New-build or Retrofits (Page 9) 30% Turndown by Fan Motors = Energy Savings (Page 5) Temperature Control by Automatic Bypass, Night Cooling & Cooling Modules (Page 14) Low Specific Fan Power 0.7-1.2 w/l/sec (Page 5) M5 / F7 Air Filters (Page 6) Aluminium Heat Exchangers (Page 14) 3
BMS DATA LO GG ER AHUs Centrally Ducted Systems The design of centrally ducted ventilation systems in buildings requires extensive ductwork. In operation, centralized air handling units require considerable specific fan power to keep all building air in circulation. AirMaster Direct Ventilation With AirMaster, direct ventilation units are installed only in those rooms where fresh air is required. Ductwork connections for each unit are limited to just two penetrations through an external wall, enabling significant savings in fan power. Building with traditional ducted ventilation Building with AirMaster demand controlled AHUs Demand Control Demand controlled ventilation is a cost effective method of maximizing indoor air quality. CO 2 sensors are used to monitor ambient conditions in ventilated spaces and provide real-time feedback to the zone controller. The controller responds by regulating ventilator fan speed. The result is that ventilation provision is kept in step with the specific needs of the building occupants. With AirMaster, the need to have the windows open becomes a thing of the past. In schools, this means that teachers can get on with the business of teaching, without having to worry about opening windows and all the associated inconvenience of traffic noise, fumes, insects, draughts and security risks. Why is Indoor Air Quality (IAQ) important? Where ventilation in a room is inadequate, heat and carbon dioxide (from occupants and computer equipment) can build up to uncomfortable levels. A high carbon dioxide level makes a room feel stuffy. Without correction of this, occupants can be expected to suffer drowsiness and impaired concentration. On the other hand, effective ventilation produces good IAQ with the benefits to occupants of alertness, improved concentration and an overall feeling of wellbeing. 4
Counterflow Heat Recovery AirMaster systems include counterflow heat exchangers to ensure the efficient recovery of heat from extracted air. By virtue of AirMaster s direct approach, each heat exchanger is contained within the associated room envelope, which means that ductwork requirements are minimal. Heat loss through such ducts is negligible, which cannot be said of long ductwork systems as used in centralized systems. AirMaster heat exchangers conform to EN308 and have a heat recovery efficiency of at least 82% (dry bulb). Typical heat recovery efficiencies: Variable Speed Fan Power EC Motors AirMaster AHUs are based on advanced fan technology, ensuring low energy consumption and long service life. Electronic commutation of fan drive motors enables linear modulating control to 30% turndown. Specific Fan Power (SFP) is between 0.7 1.2 w / l / sec for the AirMaster AM range. Calculation of SFP takes account of both fans, electronic control and the damper actuators. Counterflow plate heat exchanger 80% < h t Rotary heat exchanger 70% < h t < 80% Parallel Plate heat exchanger 55% < h t < 70% Heat Pipe and others 45% < h t < 55% Integrated fan & EC motor assembly Name of component F1 Inlet fan F2 Exhaust fan IF Fresh air filter EF Exhaust air filter MD Main damper (motorised) ED Exhaust damper (overpressure) BP Bypass damper HE Counterflow heat exchanger CT Condensate tray FT Float RT/FL Extract temperature sensor/flow sensor OT Outdoor temperature sensor ET Exhaust temperature sensor PI/PU Connection for pressure gauge for airflow measurement, inlet/extraction CH Comfort heating surface (optional) IT Inlet temperature sensor PU EXHAUST ED F2 ET MD FT Schematic of typical AirMaster unit CT HE CH * + FI BP * IT INLET INTAKE OT RT FL EF IF PI EXTRACTION 5
BMS DATA LO GG ER AHUs EN 13779 - M5 Filters as Standard / F7 Optional Indoor air quality AirMaster AHU units are provided with filters in both the fresh air intake and exhaust pathways. The filters conform to the requirements of EN 13779, (European Norm which includes guidance on filter selection - ventilation equipment installed in non-residential buildings). M5 Class filters are included as standard, with F7 offered as an alternative where external environments are expected to have a high burden of contaminants. Ensuring continued energy saving Class M5 filters are sturdy, long-lasting and effective. This means not only that indoor air quality is optimized, but also that heat exchanger surfaces are kept clean. This promotes and maintains a high level of heat exchange efficiency. If filters of lower standard (eg Class G) were used instead, the heat exchanger could be expected to show signs of deposits in just a few months. This would have adverse effects on thermal efficiency and specific fan power. 6
Noise Emissions - The Unbelievable Truth Acoustics AirMaster has one of the lowest noise profiles within the industry. Each unit is rated at no more than 35 db(a) at 1m. For areas involving high sensitivity to noise (e.g. schools for children with Special Educational Needs), AirMaster unit settings of 80% capacity would reduce noise further to 30 db(a) at 1m. AM 800 AHU installed in a classroom AM 500 AHU Sound Pressure Level, db(a) @ 1m AirMaster units have a strong attenuation effect on noise trying to make its way through from the outside. Lab tests have shown this attenuation to be 49 db, enough to make normal traffic noise virtually inaudible on the inside. This can be an important feature for designers of schools with unfavourable site noise profiles. Noise Measurement - Keeping it Simple Because each AM unit is self-contained, sound pressure levels can be measured with accuracy providing reliable predictive noise level values. There is no risk of noise ingress, as can happen with ductwork systems that pass through plant areas or other occupied spaces. 35dB(A) at 1m is the noise level of a library 7
BMS DATA LO GG ER AHUs Scandinavian Design One of our main aims when designing AirMaster s air management units was to achieve a discreet unit which would aesthetically blend into a room. A recognisable characteristic of the AirMaster AHU is its cubic design and the way it is horizontally segmented. By breaking the unit up into segments, each unit appears much lighter and more streamlined, making it less dominant in a room. Along with this, the ventilation grilles are designed to harmoniously fall in line with the rest of the unit and the room. This discreet and distinct design enables the AirMaster AHU to become more of an integrated architectural element. AirMaster s light and clean-cut lines are in keeping with traditional Scandinavian design, as practiced daily at Design-People. Klaus Schroeder MA, Industrial Designer, Partner & CEO Design People AirMaster AHUs Key benefits Provide good indoor air quality Efficient heat recovery = a true low carbon solution Excellent specific fan power means that running costs are low Easy to install additional capacity with changes to building usage. The quickest route to a fresh indoor environment Through-the-wall or through-the-roof installation Unobtrusive mounting against wall or ceiling Duct free air distribution No suspended ceilings required System can be expanded one room at a time A B 8
Choosing the right unit The size, location and purpose of each room must all be considered when providing good ventilation. AirMaster units up to AM 1000 can be mounted against the ceiling, or partly recessed into the ceiling void. WALL EXHAUST OPTION Fresh air intake and exhaust ducts are run horizontally through the wall on which the unit is mounted. The openings in the outside wall are covered with louvered gratings (as shown on back page). Possible interaction from space heating and air-conditioning systems must also be anticipated, and SAV are well placed to advise on this. ROOF EXHAUST OPTION As for the wall exhaust, mounting is also on the wall but with the fresh air and exhaust penetrations run upwards through the roof (ref photo B). External finishing is by roof caps and flashings. Ceiling unit without recess as seen in photo B (opposite page) Options for mounting In all cases, AirMaster units move supply air along the ceiling, exploiting the so-called Coanda effect. This occurs when air hugs the ceiling as when passing over a reverse aerofoil, so that when it eventually falls into the room, it does so at some distance from the AHU. USING CEILING VOID RECESS To reduce visual impact, either 1/3 or 2/3 of unit height can be concealed within the ceiling void space (ref photo A). External facing panels need only be provided for the visible portion. Recessing can be used with duct connections either through the wall or roof, with unit mounting either on the wall or ceiling. Bottom panel access for easy maintenance Partly recessed ceiling unit as seen in photo A (opposite page) 9
BMS DATA LO GG ER AHUs Floor Standing Models Floor mounted AirMaster AHUs can be positioned so as to circulate air from one side, or both sides. How do they work? SAV s AirMaster direct, low noise air handling units (AHUs) provide energy efficient, zone-specific ventilation with heat recovery. Demand control gives rapid response to local indoor air quality (IAQ) requirements. Corner positioning (plan) Mid-wall positioning (plan) AirMaster units can be installed in different ways to suit a range of spaces, ensuring optimum circulation of air and providing an environment which is fresh, comfortable and productive. Corner and mid-wall positioning (elevations) Each of these positions gives a distinctive air circulation pattern, as shown in the diagrams above. Colour options Lacquered medium density fibreboard (MDF) surface panels can be supplied in any of the 8 colours shown below, as standard. Floor standing AirMaster AHUs installed in a day care centre Where a different RAL colour is chosen, arrangements can be made to provide this at a modest additional charge. FLOOR MOUNTED MODEL is free standing and can be positioned along the room periphery, or as a means of partitioning a room. The floor standing range by AirMaster includes the AM 900 & AM 1200 AHU. 10
Technical Data Summary Wall mounted units Floor standing units AM 100 300 500 800 1000 900 1200 Maximum capacity at 35 db(a) m 3 /h 100 300 550 725 1075 830 1310 Maximum capacity at 30 db(a) m 3 /h 75 240 430 650 950 690 1050 Throw (max.) m 5.5 6.5 7.5 8 8 12 9.5 Weight (ventilation units without options) kg 40 50 108 155 286 180 630 Colour, panels RAL 9010 (white) 9010 9010 9010 9010 9010 9010 Dimensions (L x D) mm 1170 x 578 1274 x 578 1600 x 719 1910 x 916 2324 x 1244 800 x 588 2427 x 496 Dimension (H) mm 256 333 439 474 558 2323 2098 Min. room height for horizontal intake/exhaust mm - - - - - 2400 2400 Min. room height for vertical intake/exhaust mm - - - - - 2400 2500 Electrical connection Ph & V 1~230 1~230 1~230 1~230 3-230 1~230 1~230 / 3~230 Frequency Hz 50 50 50 50 50 50 50 Power consumption (max.) W 25.5 100 132 156 305 240 254 Operating current A 0.2 0.6 1.1 1.1 2.2 1.8 1.4 Power factor 0.54 0.56 0.58 0.56 0.6 0.6 0.6 SFP at maximum capacity w/l/sec 0.9 1.2 0.9 0.8 0.9 0.9 0.8 CC Cooling unit Cooling capacity W 575 2450 3280 5240 6450 - - Power consumption W 143 611 1040 1110 1450 - - Operating current A 0.9 3.8 6.4 10.8 8.9 - - Leakage current (max.) ma 1.5 2 2 2 2 - - Weight kg 35 49 71 86 85 - - Electrical heating surface Electrical heating surface (comfort heating) W 500 1500 630 1000 1500 1050 1670 Water heating surface Capacity at flow/return temperature of 70/40 C W - 400 800 1100 2800 1160 2460 Capacity at flow/return temperature of 65/35 C W - 340 680 940 2400 990 2110 Standard or Optional Control Features Inbuilt data logger CO 2 sensor wall-mounted / Integrated PIR motion sensor Humidity sensor / Condensate pump Thermostat BMS 11
BMS DATA LO GG ER AHUs Controls Data logging for unit performance monitoring AirMaster units come with integral data logging and display. Data storage enables performance analysis and diagnostics of any shortfalls, helping to keep operations and air quality optimised. Basic features and controls AirMaster s ventilation system can be optimised for local operating conditions using the features below: Manual start and stop via the control panel Automatic operation using programmed weekly schedule Background ventilation with reduced minimum airflow Night cooling Automatic bypass for temperature control Start / stop using motion (PIR) sensor Start / stop and modulating control using CO 2 sensor or hygrostat Can be controlled via main BMS system 12
Wall mounted CO 2 sensor Integrated CO 2 sensor Start / stop and modulating control by CO 2 sensor AirMaster units can be controlled to start / stop and automatically adjust the air flow using signals from a CO 2 sensor. This function is particularly suited to schools, academies and universities. Humidity sensor PIR/Motion sensor Start / stop and modulating control by humidity sensor For domestic applications, ventilation can be arranged so as to monitor and control relative humidity (RH). AirMaster hygrostats have a humidity measuring element of stabilised synthetic gauze. They can be used with either minimum or maximum settings and can operate within a range of 25-95% RH. Hydrostats are suited to systems designed for a constant base level of ventilation, with the dehumidify signal used to take the unit to full power. Start / stop by movement sensor (PIR) The ventilation system can be set to start / stop using a signal from a movement (PIR) sensor. When this signal ceases, the ventilation unit does not stop immediately, but continues in operation for a further pre-set period of say, 30 minutes, to maintain steady conditions in the event of an occupant s return. 13
BMS DATA LO GG ER AHUs Automatic Bypass Control for Free Cooling of Supply Air Should inlet temperature increase beyond the desired setting, an automatic bypass damper diverts a portion of incoming fresh supply air around the counterflow heat exchanger. This bypass air remains at external conditions and helps to bring down the temperature of the re-combined flow of supply air. During periods of hot weather, night time operation by AirMaster units takes advantage of the thermal mass of the associated building. The temperature of supply air during night hours can be expected to fall, and movement of this air into a room would effectively cool down the room surface areas. As temperature increases again the following day, supply air would be cooled as it passed over the same surface areas. Night cooling is at the cheapest electricity tariff, helping to reduce the cost of daytime operation by any supplementary coolers. Where external temperatures of over 30 0 C can be expected, AirMaster offer dedicated cooling units. These are designed to reduce supply air temperature by up to 15 0 C. Cooling units are dimensionally compatible with all horizontally mounted AM models and can be readily integrated with the associated control panels. Supplementary Heating To avoid any feeling of draught on cold days, heating can be provided to the supply air pathway, just before entering the room. Heating can be by finned water tube or electric element. Automatic Condensate Control Aluminium Heat Exchangers AirMaster counterflow heat exchangers are made of pressed aluminium elements. They have a thermal efficiency of 82% (EN 308 dry bulb) and 90% (50% RH, -10ºC external temp). The natural conductivity of aluminium enables internal air pathways to be kept wide. The heat exchanger elements Counterflow Heat Exchanger have a free space of 3.4mm between plates and individual passageway areas of 60mm 2. This eliminates the risk of condensate blockage. Condensate Removal During heat recovery, exhaust air is cooled significantly and it s entrained moisture falls out as condensate. This is led to a collection tray. Normally, this condensate is evaporated by the exhaust air. However, if conditions prevent this happening and the quantity of condensate increases, this would be detected by a float sensor. The resultant signal reduces the flow of fresh air and increases exhaust air flow. In this way, the condensate is further encouraged to evaporate, leading to the condensate sensor being deactivated. Where a high level of humidity is anticipated (such as in the wet areas) a condensate pump can be provided as an option. 14
Airlinq BMS An Airlinq BMS Network can control up to 20 AHUs from a single control panel. The figure shows an Airlinq BMS with a central control panel and two sensors (e.g. PIR and CO 2 ) in each room Digital BMS In addition, interface modules can be provided to accept signals from the following types of main BMS: KNX BACnet TM / IP BACnet TM MS / TP LON MODBUS RTU RS485 Working together, AirMaster and BMS can: Display and log all information (sensors and equipment status) for operation, performance monitoring and carbon reduction assessment Enable remote adjustment of set points Activate night cooling Process alarm signals e.g. filter change notification Provide information from CO 2, movement or humidity sensors Enable remote diagnostics of equipment performance 15
External Views of AirMaster AHUs We hope you have found the contents to be of interest. For further information, or to request an AirMaster product brochure, please call us on: 01483 771910 or email us at info@sav-systems.com SAV Systems, Scandia House, Boundary Road, Woking, Surrey GU21 5BX Tel: +44 (0)1483 771910 Web: www.sav-systems.com E-mail: info@sav-systems.com