Μηχανικός εξαερισμός με ανάκτηση θερμότητας

Mechanical ventilation with heat recovery

technical trainingmartedì 17 gennaio 2012

Technical training - part A

Mecchanical ventilation heat recovery

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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



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BenefitsAir 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 comfortControllo delle condizioni microclimatiche rispetto a:

- air temperature

- air humidity

- air movements and speed


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




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




Natural ventilation

Advantages: - no fan and no energy consumption- little investment


Drawbacks: - bad control of air change- noises coming from the openings- people feeling cold flows near the openings



Mechanical ventilation heat recovery

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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




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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




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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.




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Double flow ventilationSimple 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




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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.




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Heat recovery

The heart of the system: the air to air heat exchanger

external air

polluted internal air

internal air

preheated air




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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




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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



Individual ventilation units

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Model Air flowm3/h Microprocessor* Power supply

VFans power

W

Sensible heat recovery efficiency

%Weight

Kg

CP 150 150 CTR 230 43 >92 38

CPX 150 150 CTRX 23043

>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




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*





ALTAIR HR - VR

Model Air flowm3/h

Microprocessor* Power supplyV

Fans powerW


%

WeightKg

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






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


-plug-n-play connection with electrical panel

-standard microprocessor control CTR*

-advanced microprocessor control CTRX*

ALTAIR HR





ALTAIR SP

Model Air flowm3/h

Microprocessor* Power supplyV

Fans powerW


%

WeightKg

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



Separable ventilating unit and heat recovery module.




ALTAIR SP


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



Collective Ventilation Units

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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.




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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





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ALTAIR XC

- two models available: 100m3/h and 200m3/h nominal airflow

- horizontal installation with beneath access for inspection



-G4 filter for exhaust air


High efficiency heat recovery modules





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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



-G4 filter for exhaust air





Electronic microprocessors

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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

√



Electronic microprocessors

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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)√



Air distribution system

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Components and pieces od the distribution ductworks

Insulated plenums for inlet/outlet air

Insulated silencer

Regulation rings for reduction




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components and pieces od the distribution ductworks

Connections for valves

Half hard duct for air inlet

Half hard duct for air outlet




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components and pieces od the distribution ductworks

Valves for installation on wall/ceiling

Ventilation grids for inlet/outlet air




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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.



Reference projects

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Individual ventilation for apartments in a condominium

ALTAIR CP - Milano



Reference projects

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Thanks for attention


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