EPP Air Handling Unit with swept internal air flow paths Steel powder coated frame Acoustic Air treatment zone External insulated volume control damper 24V Actuators to dampers Internal louvre grille supplied as a standard in white. Other colours available upon request Linear grille for recirculation and natural ventilation air paths Recirculation and natural ventilation air volume control damper Halifax House, Cressex Business Park High Wycombe Buckinghamshire HP12 3SE T: +44 (0) 1494 897700 F: +44 (0) 1494 532465 E: info@monodraught.com W: www.monodraught.com
Hybrid Thermal Mixing (HTM) system - Façade Plus series (F+) Façade Plus series (F+) The Hybrid Thermal Mixing (HTM) system from Monodraught is designed to provide natural ventilation, hybrid ventilation incorporating mixed tempered air for winter periods with the ability to provide secure night time cooling and boosted levels of ventilation during summer. The system is designed to work in conjunction with natural ventilation provided by manual or automatic windows and can be used in single sided or cross flow ventilation strategies. The units can be mounted horizontally above windows or mounted vertically to the sides of rooms and can also be ducted to provide ventilation to deep plan rooms. The system comprises of an intelligent and fully automatic control system coupled with a low energy ventilation system which switches between operational modes dependant on season, external/internal temperature conditions and indoor air quality (IAQ). Designed to meet Priority School Building Programme requirements, the Monodraught HTM F+ series uses exceptionally low specific fan powers and features an intelligent control system which is supplied as standard with full data logging facility, temperature control and CO 2 control. With the optional BACnet module, each unit has the ability to output key performance data to a central BMS to show compliance within PSBP guidelines. TECHNICAL DETAILS Material: EPP (Expanded Polypropylene) 100% recyclable. ABS, aluminium and rubber sealed volume control dampers. Composite high density glass wool cladding. Performance: Daytime hybrid ventilation rate of approximately 200 l/s (SFP 0.15). Night time hybrid ventilation rate of approximately 300 l/s (SFP 0.30). U-value through external air shut off damper = 1.2 Wm²K. Air tightness = 2 m3/h/m² @50Pa. Options: BACnet BMS interconnection module. Alternative grille colours available on request. System Requirements: Connection to clean outside air source (inlet positioned away from sources of pollution). 240V 3A fused switched spur mounted within 1m of unit. 2 F +
Dimensions: 1000 mm deep x 500 mm high, width varies with model. System Width Natural Ventilation Effective Free Area Weight of System Typical Louvre Size required (50%) 1000 mm 0.36 m 2 32 kg 1300 mm x 500 mm 1500 mm 0.5 m 2 40 kg 1800 mm x 500 mm Façade Plus series (F+) SPECIFICATION Hybrid thermal mixing ventilation system to suit a façade application. Each system is supplied complete with a fully automatic control system managing a low energy fan, insulated external volume control damper with rubber sealed low leakage aerofoil blades and re-circulation volume control damper. System constructed from EPP airflow paths and composite panels providing high levels of acoustic operation and composite panels to meet BB93 requirements. Systems are available in two widths of 1000 mm or 1500 mm wide with an overall height 500 mm and a depth of 1000 mm. Installed using drop rod (provided by others) or Gripple supports with white panel finish or boxing in by others following installation. White louvred supply grille and white linear recirculation grille are provided as standard. Fully automatic intelligent control system with traffic light indicator for manual window operation, temperature and carbon dioxide sensing and user overrides. Seasonal time and date clock built in with full data logging functionality. Optional BACnet module is available to allow BMS data interconnection. An external weather louvre (provided by others) is required for connection to HTM F+. Louvre panel to be supplied fitted with bird guard mesh and a spigot/ transition. HTM F+ system to be capable of providing an assisted ventilation rate of 200 l/s and night time purge mode of 300 l/s to provide secure night time cooling. Each system to provide a natural ventilation air path to assist natural ventilation through openable windows and reduce fan operation. CONTROLS AND USER INTERFACE Wall mounted user controls with: Room Temperature and CO 2 sensor. On/Off control. High, Medium(auto) and Low fan speed settings. LED wall panel to indicate when to open windows. 3 F +
Façade Plus series (F+) TYPICAL INSTALLATION/OPERATION DETAIL Cross Flow: Openable windows Summer Day Summer Night Winter Day Monodraught HTM F+ system mounted at the rear of a room to assist with cross flow ventilation using openable windows on the facade. System automatically provides secure night time cooling through natural ventilation opening or fan assisted if required. Winter ventilation automatically modulates dampers to mix re-circulated air with external air to ensure optimum ventilation temperatures. Single Sided Flow: Openable windows Summer Day Summer Night Winter Day Monodraught HTM F+ system mounted on the façade (can be ducted to provide ventilation to the rear of deep plan rooms) to assist with single sided ventilation using openable windows. System automatically provides secure night time cooling through natural ventilation opening or fan assisted if required. Winter ventilation automatically modulates dampers to mix re-circulated air with external air to ensure optimum ventilation temperatures. Single Sided Flow: Classroom 1 Classroom 2 Full height glazing & openable windows Plan View - Summer Day Section - Summer Night Section - Winter Day Monodraught HTM F+ units can be mounted vertically on the façade and can be ducted to provide ventilation to the rear of deep plan rooms to assist with single sided ventilation from manually openable windows. The duct can be a builders work plenum and is shown here with three linear grilles. This installation method allows full height glazing to be used at the elevation to maximise daylight levels within the room. 4 F +
WIRING DETAILS Standard Connections Optional Connections Façade Plus series (F+) OPTIONS Widths 1000 mm, or 1500 mm (10 or 15). Horizontal or Vertical Mounting (H or V). White panel finish for exposed installation or Silver panel finish for boxing in by others (W or S). Order code example HTM F+ (15, H, W). Controls interconnection options include: Master / slave mode to synchronise multiple units in a single zone. Inhibit input to enable / disable HTM F+ series system from BMS or Fire Alarm circuit. TYPICAL SPECIFICATION...No. Monodraught Hybrid Thermal Mixing ventilation systems to suit a façade application (HTM F+ code). Overall dimensions are 1000 mm/1500 mm wide x 1000 mm deep x 500 mm high. Each system is supplied complete with a low energy fan to provide 200 l/s (SFP 0.15) for mixed ventilation air, with the capability for night time purge mode of 300 l/s (SFP 0.30) to provide secure night time cooling, an insulated external volume control damper with rubber sealed low leakage aerofoil blades and a re circulation volume control damper. The system comes complete with a fully automatic intelligent control system including a wall mounted controller with integral temperature & carbon dioxide sensor, user overrides, and a traffic light indicator to advise room occupants regarding window operation. A built in seasonal time and date clock with full data logging functionality is also included. 5 F +
Façade Plus series (F+) The system is constructed from EPP airflow paths with composite cladding, providing high levels of acoustic attenuation and is supplied with Gripple fixings for installation. The HTM is suitable for boxing in following installation. Please note, the external weather louvre and transition to HTM are to be supplied, by others. Monodraught are able to provide a separate quotation for these items if required. CONTROL STRATEGY The HTM F+ incorporates a fully automatic control system based on a seasonal control strategy. The seasonal strategy is determined by time and date but is weather compensated to pick up unseasonal conditions. The system looks to provide natural ventilation as the default method of ventilation indicating when manual windows should be utilised to maximise IAQ and maintain comfort levels. The control system incorporates a number of temperature sensors integral to the unit to monitor external temperature, mixed air temperature and supply air temperature. In addition, a wall mounted controller fitted with an internal temperature, CO 2 sensor and user override and a manual window traffic light indicator are included as standard. Data is stored per minute on an integral data card for data analysis and compliance requirements as required. During daytime periods in the Spring, Summer and Autumn seasons, if the internal room temperature exceeds 26 C or the CO 2 level goes above 1500 ppm, the system will provide a boosted level of ventilation until which time optimum conditions are met. If the external temperature is below 15 C the system will operate under a hybrid ventilation strategy as per winter mode. During Summer periods between midnight and 7 am and the internal temperature is above 18 C, the system will provide night time cooling providing a peak ventilation rate of 300 l/s until such time that the internal temperature goes below 18 C. During Winter periods the system will operate under a hybrid ventilation strategy utilising the fan to mix and re-circulate warm room air to minimise cold draughts. All settings are customisable during commissioning phase. WINTER TIME THERMAL MIXING Depending on the external air temperature, the system will introduce ventilation air mixed with recirculated room air with the ratio of mixed to fresh air to minimise cold draughts and maintain IAQ / comfort conditions. Generally the system will try to supply a mixed air temperature above 15 C. Thermal Mixing Conditions: Internal room temperature = 23 C Ventilation rate set at 200 l/s External Temperature range varies Mixing of recirculation and external air supplies vary to maintain minimum supply air temperature of 15 C. System automatically modulates over 100% and these mixing levels are for representation only. 6 F +
Thermal Mixing Conditions Internal Room Temperature 23 o C Ventilation Rate 200 l/s External Temperature range varies Mixing of recirculation and external air supplies vary to maintain minimum supply air temperature of 15 o C. System automatically modulates over 100% and these mixing levels are for representation only Resulting mixed air temperature passed into room (temperature reading 1 m from edge of diffuser) 20 15 10 5 Min supply temperature Façade Plus series (F+) 0 Text 15 Mixing Rate 2:5-60 l/s Fresh air 140 l/s Recirculated air Mixing Rate 1:2-70 l/s Fresh air 130 l/s Recirculated air Mixing Rate 2:3-80 l/s Fresh air 120 l/s Recirculated air Mixing Rate 3:4-85 l/s Fresh air 115 l/s Recirculated air Mixing Rate 4:5-90 l/s Fresh air 110 l/s Recirculated air 20.8 20.4 19.9 19.7 19.5 Mixing Rate 1:1-100 l/s Fresh air 110 l/s Recirculated air 19.1 Mixing Rate 3:2-120 l/s Fresh air 80 l/s Recirculated air 18.3 Mixing Rate 2:1-130 l/s Fresh air 67 l/s Recirculated air 17.7 Mixing Rate 3:1-150 l/s Fresh air 50 l/s Recirculated air 17.1 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0-1 -2-3 -4-5 20.6 20.5 20.4 20.3 20.2 20.1 20.0 19.9 19.8 19.7 19.4 19.1 18.8 18.4 18.1 17.9 17.7 17.5 17.2 17.0 20.2 19.6 19.3 19.2 18.7 17.8 17.2 16.4 20.0 19.4 19.1 18.9 18.4 7.4 16.7 15.9 19.9 19.1 18.8 18.7 18.0 16.9 16.2 15.3 19.7 18.9 18.6 18.4 17.7 16.5 15.7 14.7 19.6 18.7 18.3 18.1 17.4 16.1 15.2 14.2 19.4 18.5 18.1 17.9 17.1 15.7 14.8 13.6 19.3 18.3 17.8 17.6 16.8 15.3 14.3 13.0 19.1 18.0 17.6 17.3 16.4 14.8 13.8 12.5 19.0 17.8 17.3 17.1 16.1 14.4 13.3 11.9 18.8 17.6 17.1 16.8 15.8 14.0 12.8 11.3 18.5 17.1 16.6 16.3 15.3 13.4 12.1 10.6 18.1 16.7 16.2 15.8 14.7 12.7 11.4 6.8 17.7 16.3 15.7 15.4 14.2 12.1 10.7 9.0 17.4 15.9 15.2 14.9 13.7 11.5 10.0 8.2 17.0 15.4 14.8 14.4 13.1 10.8 9.3 7.5 16.7 15.1 14.4 14.0 12.7 10.3 8.7 6.8 16.5 14.8 14.0 13.6 12.2 9.8 8.1 6.1 16.2 14.4 13.7 13.2 11.8 9.2 7.5 5.4 15.9 14.1 13.3 12.9 11.4 8.7 6.9 4.7 15.6 13.7 12.9 12.5 10.9 8.1 6.3 4.1 TESTING During December 2013 an HTM F+ system was installed within a climatic test chamber and a special heat sensitive membrane was fitted running through the centre of the system. An insulated chamber fitted below the HTM F+ system was heated to 23 C to represent an internal room condition. Thermal imaging video cameras were used to record the temperature profile of the mixing of air in real time. The thermal imaging cameras were set to record three zones with averaged temperature readings within each zone :- external air temperature, internal room air temperature and mixed supply air temperature. The system was then set to provide 200 l/s of mixed ventilation air to represent maximum daytime ventilation rates. Zone 1 is recording the external air temperature with an average temperature within the measured zone of 11.7 C Zone 2 is recording an internal room temperature with an average temperature within the measured zone of 22.7 C Zone 3 is recording the mixed air supply temperature with an average temperature within the measured zone of 16.4 C 7 F +
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