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Μηχανικός εξαερισμός με ανάκτηση θερμότητας
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Μηχανικός εξαερισμός με ανάκτηση θερμότητας

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  • 1. Mechanical ventilation with heat recovery technical training martedì 17 gennaio 2012
  • 2. Technical training - part A Mecchanical ventilation heat recovery 2 Ventilation Ventilation is the process of replacing waste air in any indoor space to provide high air quality for occupants comfort and wellbeing. martedì 17 gennaio 2012
  • 3. Technical training - part A Mecchanical ventilation heat recovery 3 Benefits Air quality - bacteria and fungi Reduction of air pollution due to high concentration of: - chemical substances (radon, smoke, carbone monoxide and dioxide, volatile organic compounds) - humidity and smelles Low energy consumption - ventilation heat losses reductione - wellbeing of walls and structures protected from indoor humidity The correct ventilations rate ensure: Indoor comfort Controllo delle condizioni microclimatiche rispetto a: - air temperature - air humidity - air movements and speed martedì 17 gennaio 2012
  • 4. Technical training - part A 4 Natural ventilation The ventilation flow rates are not constant but depending on external conditions In natural ventilation external air flows to an indoor space as a result of pressure difference due to - wind - temperature differences Mecchanical ventilation heat recovery martedì 17 gennaio 2012
  • 5. Technical training - part A 5 Natural ventilation - NATURAL VENTILATION is based only on userʼs sansations about indoor air quality. External air flows throught windows and doors opened by the users. - NATURAL CONTROLLED VENTILATION is based on userʼs or mechanical operations according to fixed and controlled criteria Mecchanical ventilation heat recovery martedì 17 gennaio 2012
  • 6. Technical training - part A 6 Natural ventilation Advantages: - no fan and no energy consumption - little investment Mecchanical ventilation heat recovery Drawbacks: - bad control of air change - noises coming from the openings - people feeling cold flows near the openings martedì 17 gennaio 2012
  • 7. Technical training - part A Mechanical ventilation heat recovery 7 Mechanical ventilation In this case, the new air is introduced naturally in the spaces thanks to adjustable air-vents situated on the outside walls. On the other hand, foul air is extracted mechanically (fans). With this extraction, the spaces are on depression and this favours the infiltration of new air. Simple flow ventilation martedì 17 gennaio 2012
  • 8. Technical training - part A Mechanical ventilation heat recovery 8 Mechanical ventilation Simple flow ventilation Advantages: - symple system and easy to use - extracted air debits are controlled - no ventilation network is nedeed Drawbacks: - air-vents are source of noises - risk of cold air flow due to air-vents badly set - no heat recovery martedì 17 gennaio 2012
  • 9. Technical training - part A Mechanical ventilation heat recovery 9 Mechanical ventilation Double flow ventilation New air filtered and preheated in winter is mechanically distribuited by a ductwork. Air is mechanically extracted by another ductwork The heart of the system is a heat exchanger witch ensures the thermal energy recovery from extracted air. martedì 17 gennaio 2012
  • 10. Technical training - part A Mechanical ventilation heat recovery 10 Mechanical ventilation Double flow ventilation Simple flow ventilation Advantages: - debits air controlled everyehere - air filtered and treated before distribution - heat recovey from polluted air flow Drawbacks: - more expensive system - ductworks integrated in the structure - important and frequent maintenance martedì 17 gennaio 2012
  • 11. Technical training - part A Mechanical ventilation heat recovery 11 The heart of the system: the air to air heat exchanger The counter flow energy recovery heat exchanger recovers waste heat from extracted air Heat recovery In the countercurrent exchanger two air rates flow in opposite directions to each other: the maximum amount of heat that can be obtained is higher than with other exchangers. martedì 17 gennaio 2012
  • 12. Technical training - part A Mechanical ventilation heat recovery 12 Heat recovery The heart of the system: the air to air heat exchanger external air polluted internal air internal air preheated air martedì 17 gennaio 2012
  • 13. Technical training - part A Mechanical ventilation heat recovery 13 ALTAIR HEAT EXCHANGERS -polypropylene counterflow heat exchanger -high heat recovery efficiency (up to 95%) -automatic exchanger defrost function -automatic by-pass - easy maintenance operations thanks to the removable panel martedì 17 gennaio 2012
  • 14. Technical training - part A Mechanical ventilation heat recovery 14 Double flow ventilation with heat recovery The exchanger recovers heat from extracted air to warm incoming airAir is extracted from polluted spaces such as bathrooms and kitchens Air is distributed in the other spaces such as bedrooms and livin rooms martedì 17 gennaio 2012
  • 15. Technical training - part A Individual ventilation units 15 Model Air flow m3 /h Microprocessor* Power supply V Fans power W Sensible heat recovery efficiency % Weight Kg CP 150 150 CTR 230 43 >92 38 CPX 150 150 CTRX 230 43 >92 38 Data referred to the following conditions: Dbt external air -5°C; external R.H. 80%; Dbt environment 20°C; environment R.H. 50%; 50% nominal airflow Mechanical ventilation units with high efficiency heat recovery. ALTAIR CP martedì 17 gennaio 2012
  • 16. Technical training - part A 16 Mechanical ventilation units with high efficiency heat recovery. ALTAIR CP -150m3 /h nominal airflow -compact size and reduced height -vertical installation on wall or horizontal on ceiling -low consumption radial fans with electronic motors -G4 filters for exhaust air -F7 low pressure drop filters for fresh air -plug-n-play connection with electrical panel -standard microprocessor control CTR* -advanced microprocessor control CTRX* Individual ventilation units martedì 17 gennaio 2012
  • 17. Technical training - part A 17 Mechanical ventilation units with high efficiency heat recovery. ALTAIR HR - VR Model Air flow m3 /h Microprocessor* Power supply V Fans power W Sensible heat recovery efficiency % Weight Kg HR 300 350 CTR 230 71 x 2 >93 52 VR 300 350 CTR 230 71 x 2 >93 48 HR 500 500 CTR 230 200 x 2 >91 52 VR 500 500 CTR 230 200 x 2 >91 48 HRX 300 350 CTRX 230 71 x 2 >93 52 VRX 300 350 CTRX 230 71 x 2 >93 48 HRX 500 500 CTRX 230 200 x 2 >91 52 VRX 500 500 CTRX 230 200 x 2 >91 48 Data referred to the following conditions: Dbt external air -5°C; external R.H. 80%; Dbt environment 20°C; environment R.H. 50%; 50% nominal airflow Individual ventilation units martedì 17 gennaio 2012
  • 18. Technical training - part A 18 Mechanical ventilation units with high efficiency heat recovery. ALTAIR VR -two models available: 350m3/h and 500m3/h nominal airflow -VR version for vertical installation on wall or floor -HR version for horizontal installation on floor or ceiling -low consumption radial fans with electronic motors -G4 filters for exhaust air -F7 low pressure drop filters for fresh air -plug-n-play connection with electrical panel -standard microprocessor control CTR* -advanced microprocessor control CTRX* ALTAIR HR Individual ventilation units martedì 17 gennaio 2012
  • 19. Technical training - part A 19 Individual ventilation units ALTAIR SP Model Air flow m3 /h Microprocessor* Power supply V Fans power W Sensible heat recovery efficiency % Weight Kg SP 300 350 CTR 230 71 x 2 >92 45 SPX 300 350 CTRX 230 71 x 2 >92 45 SP 500 500 CTR 230 200 x 2 >90 46 SPX 500 500 CTRX 230 200 x 2 >90 46 Data referred to the following conditions: Dbt external air -5°C; external R.H. 80%; Dbt environment 20°C; environment R.H. 50%; 50% nominal airflow Mechanical ventilation units with high efficiency heat recovery. Separable ventilating unit and heat recovery module. martedì 17 gennaio 2012
  • 20. Technical training - part A 20 Individual ventilation units ALTAIR SP Mechanical ventilation units with high efficiency heat recovery. Separable ventilating unit and heat recovery module. - two models available: 350m3/h and 500m3/h nominal airflow - separable ventilating module and heat recovery unit - casing made of high density PPE and steel - horizontal installation on floor or ceiling - low consumption radial fans with electronic motors - G4 filters for exhaust air - F7 low pressure drop filters for fresh air - plug-n-play connection with electrical panel - standard microprocessor control CTR* - advanced microprocessor control CTRX* - inspectionable exchanger and filters martedì 17 gennaio 2012
  • 21. Technical training - part A Collective Ventilation Units 21 Mechanical Ventilation System for collective dwellings Renewal of the air in single flats is ensured by a couple of centralised fans located on the roof or on a terrace of the building. Heat recovery is made by recovery u n i t s l o c a t e d i n t h e s i n g l e apartments. martedì 17 gennaio 2012
  • 22. Technical training - part A Collective Ventilation Units 22 HELIX Air ventilating units to be interfaced with heat recovery modules: - nominal airflow from 2000m3/h to 5600m3/h - high values of static pressure available to the ducting - inverter controlled centrifugal blowers -constant pressure -double panels casing with rockwall insulation -differential and average pressure sensors Mechanical Ventilation System for collective dwellings martedì 17 gennaio 2012
  • 23. Technical training - part A Collective Ventilation Units 23 ALTAIR XC - two models available: 100m3/h and 200m3/h nominal airflow - horizontal installation with beneath access for inspection -polypropylene counterflow heat exchanger -high heat recovery efficiency (up to 95%) -G4 filter for exhaust air -F7 low pressure drop filters for fresh air High efficiency heat recovery modules Mechanical Ventilation System for collective dwellings martedì 17 gennaio 2012
  • 24. Technical training - part A Collective Ventilation Units 24 ALTAIR SP High efficiency heat recovery modules -two models available: 350m3/h and 500m3/h nominal airflow -to be interfaced with HELIX external ventilating unit -horizontal installation on floor or ceiling -polypropylene counterflow heat exchanger -high heat recovery efficiency (up to 95%) -G4 filter for exhaust air -F7 low pressure drop filters for fresh air Mechanical Ventilation System for collective dwellings martedì 17 gennaio 2012
  • 25. Technical training - part A Electronic microprocessors 25 Standard microprocessor CTR List of the available functions CTR Manual selection of the fans speed: OFF + 3 speed levels √ Automatic by-pass management √ Prevention from heat exchanger freezing: speed reduction/stop of the intake fan; max level of the exhaust air fan speed √ Simplified visualization of the unit operation mode and of incidental alarms (LED) √ Filters status monitoring by mean of the running time of the unit or by controlling the pressure drop across the filters √ Fans status monitoring through tachimetric signal (if available on the fan) or by controlling the pressure difference between the inside and outside of the supply and exhaust air ducts √ martedì 17 gennaio 2012
  • 26. Technical training - part A Electronic microprocessors 26 Advanced microprocessor CTRX - main features Tabella rapida delle funzioni disponibili List of the available functions CTRX Manual selection of the fans speed: OFF regulation of the fan speed in a range [MIN-MAX] √ Unbalanced airflow between inlet airflow and exhaust airflow √ Automatic control of the fans speed: CO2 e CO2/VOC, HR sensors with programmable range of PPM or HR (by the user); 3 speed levels or continous speed √ Remote control of the fans speed by 0-10VDC signal √ Booster (fans at maximum speed) for a period of time settable by the user √ Booster from a remote contact NC for a fixed range of time. (time range settable by the software) √ Booster from a remote proximity switch NC: PIR strategy √ Unit switch ON/OFF from a remote contact √ Weekly cronoprogrammming √ Prevention from heat exchanger freezing: proportional electric pre-heater √ Prevention from heat exchanger freezing by closing a free voltage switch to allow the user to start a customized strategy √ Managing of electrical post-heating in a proportional way in order to reach the set point value for the average internal temperature Tr and to mantain the intake air temperature Ti in a fixed range (comfort range) √ Managing of a water post-heating in a proportional way in order to reach the set point value for the average internal temperature Tr and to mantain the intake air temperature Ti in a fixed range (comfort range) √ Managing of a water post-cooling in a proportional way in order to reach the set point value for the average internal temperature Tr and to mantain the intake air temperature Ti in a fixed range (comfort range) √ Simplified visualization of the unit operation mode and of incidental alarms (sinoptic and detailed) √ Remote selection of the unit running mode: closed contact=unit is ON; open contact=unit is OFF or unpowered √ Possible managing of more than 1 similar units (up to 4) with a single control panel (master & slave) √ Possibility to change the language of the remote control panel (Italian, English, French, German, Spanish) √ martedì 17 gennaio 2012
  • 27. Technical training - part A Air distribution system 27 Components and pieces od the distribution ductworks Insulated plenums for inlet/outlet air Insulated silencer Regulation rings for reduction martedì 17 gennaio 2012
  • 28. Technical training - part A Air distribution system 28 components and pieces od the distribution ductworks Connections for valves Half hard duct for air inlet Half hard duct for air outlet martedì 17 gennaio 2012
  • 29. Technical training - part A Air distribution system 29 components and pieces od the distribution ductworks Valves for installation on wall/ceiling Ventilation grids for inlet/outlet air martedì 17 gennaio 2012
  • 30. Technical training - part A Air distribution system 30 Ventilation flow rates Ventilation debits are calculated in accordance with: - European and national standards about energy efficiency - European and national standards about indoor air quality - local hygienic reccomendations Indoor air quality is ensured by the frequency of turnover of interior air by replacement with outside air. The number of changes per hour depends on the type of spaces (residential building, office, school ecc.) For residential applications the frequency is about 0,5-0,7 changes per hour. martedì 17 gennaio 2012
  • 31. Technical training - part A Reference projects 31 Individual ventilation for apartments in a condominium ALTAIR CP - Milano martedì 17 gennaio 2012
  • 32. Technical training - part A Reference projects 32 Thanks for attention martedì 17 gennaio 2012