Passivehouse 0459vl03 ComfoAir XL 800 Certified Passive House Component Instructions
- June 13, 2024
- Passivehouse
Table of Contents
- 0459vl03 ComfoAir XL 800 Certified Passive House Component
- Passive House comfort criterion
- Efficiency criterion (heat recovery rate)
- Airflow range and external pressure difference
- Efficiency criterion (electric power)
- Settings and airflow balance
- Acoustical testing
- Frost protection
- Documents / Resources
CERTIFICATE
Certified Passive House Component
Component-ID 0459vl03 valid until 31st December 2022
0459vl03 ComfoAir XL 800 Certified Passive House Component
| Category: | Air handling unit with heat recovery |
|---|---|
| Manufacturer: | Zehnder Group Nederland B.V. |
Netherlands
Product name:| ComfoAir XL 800
Specification:| Airflow rate > 600 m3/h
Heat exchanger:| Recuperative
This certificate was awarded based on the product meeting the following main criteria
| Heat recovery rate ηHR | ≥ 75 % |
|---|---|
| Specific electric power Pel,spec | ≤ 0.45 Wh/m3 |
| Leakage | < 3 % |
| Performance number | ≥ 10 |
| Comfort | Supply air temperature ≥ 16.5 °C at outdoor air temperature of −10 °C |
Airflow range 300–535 m3/h at an external pressure of 155 Pa1)
Requirements residential buildings
Heat recovery rate ηHR = 80 %
Specific electric power Pel,spec = 0.45 Wh/m3
1)Available pressure difference with installed filters makes 145 Pa. Additional
components (e.g. heater coil) decrease the available pressure difference
accordingly.
Passive House comfort criterion
A minimum supply air temperature of 16.5 °C is maintained at an external air temperature of -4.0 °C without activated frost protection strategy. It is assumed that at lower outdoor air temperatures the frost protection strategy will be activated and the comfort criterion will be met.
Efficiency criterion (heat recovery rate)
The effective heat recovery rate is measured at a test facility using balanced mass flows of the outdoor and exhaust air. The boundary conditions for the measurement are documented in the testing procedure. With
| ηHR | Heat recovery rate in % |
|---|---|
| ∅ETA | Extract air temperature in °C |
| ∅ETA | Exhaust air temperature in °C |
| ∅ODA | Outdoor air temperature in °C |
| Pel | Electric power in W |
| ˙m | Mass flow in kg/h |
| cp | Specific heat capacity in W h/(kg K) |
Heat recovery rate
ηHR = 80 %
Airflow range and external pressure difference
The operational range of the device results from the efficiency criterion (see
below). As per the certification criteria for ventilation units > 600 m3 /h the
applicable pressure differences vary with the nominal range of operation (as
declared by the producer) and the application (residential or non –
residential building).
The external pressure difference includes all pressure losses of the
ventilation system caused by components apart from the tested unit (consisting
of casing, heat exchanger and fans). If filters are installed inside of the
unit, their pressure losses are to be reduced accordingly. The average filter
pressure drop of an operational filter is assumed to be 30% higher than that of
the clean filter.
- This device was tested according to the requirements of residential buildings with an airflow range of 300-535 m3 /h at an external pressure difference of 155 Pa. The available pressure difference with installed filters is about 145 Pa.
Efficiency criterion (electric power)
The overall electrical power consumption of the device including controllers
was measured at the test
facility as per the requirements for residential buildings at an external
pressure difference of 155 Pa.
Specific electric power
Pel,spec = 0.45 Wh/m3
Leakage
The airtightness of the unit is tested for under pressure and over pressure
before the thermodynamic test is conducted. As per the certification criteria
the leakage airflows must not exceed 3 % of the average airflow of the device’s
operating range.
| Internal leakage | External leakage |
|---|---|
| 1.00% | 1.30% |
Settings and airflow balance
It must be possible to adjust the balance of airflows at the unit itself (either between the exhaust and the outdoor airflows or between the supply and the extract airflows, if the unit is respectively placed inside or outside of the insulated thermal envelope of the building). Available operation modes are explained in detail in the operation manual.
-
Balancing the airflow rates of the unit is possible.
√ The airflow volumes can be held steady automatically (by measurement of pressure differences at the fan inlet nozzle). -
The standby power consumption of this device makes 11.90 W. The target value of 1 W was exceeded. The device should be equipped with an additional external switch so that it can be disconnected from the mains, if required.
-
After a power failure, the device will automatically resume operation.
Acoustical testing
A ventilation unit > 600 m3 /h is assumed to be operated in an installation room, for which sound limits are defined in the applicable regulations. For this device, the following sound level values have been derived from the measurements at an airflow rate of 535 m3/h:
| Duct
---|---
Device| Outdoor| Supply air| Extract air| Exhaust air
53.9 dB(A)| 52.6 dB(A)| 70.9 dB(A)| 51.5 dB(A)| 70.4 dB(A)
- For complying with the required sound level in the supply are and extract air rooms, dimensioning of a suitable silencer is required for the specific project on the basis of the measured sound level.
Indoor air quality
Instructions for changing of the air filters are documented in the operation
manual. This device is equipped with following filter qualities:
| Outdoor air filter | Extract air filter |
|---|---|
| F7 | G4 |
If the device is not operated during summer, the filter should be replaced
before the next operation.
The producer of the device has to ensure that based on the latest findings,
room air hygiene can be maintained by means of integrated or obligatory
components.
For the operation of ventilation systems a strategy for avoiding permanent
moisture penetration of the outdoor air filter needs to be considered. The
strategies are mentioned in the full report and can be implemented through
installation of either an additional component of the ventilation device in
the factory, or retrofitted to the system on-site.
Frost protection
Appropriate measures should be taken to prevent the heat exchanger and optional downstream hydraulic heater coil from getting damaged by frost during extreme winter temperatures (−15°C). It must be ensured that the unit’s ventilation performance is not affected during frost protection cycles.
-
Frost protection of the heat exchanger:
√ In order to protect the heat exchanger from freezing, the manufacturer recommends the optional installation of the hot water hydraulic coil W/17/250/2R/3K/2.9. Depending on the inlet temperature a heating power up to 5 kW is available. Alternatively, the control system of the device enables use of an additional external preheater. -
Frost protection of downstream hydraulic heater coils:
√ According to manufacturer information, the device is switched off in the case that the supply air temperature drops below to 5 °C.
It should be noted that, due to free circulation, cold air can also lead to
freezing – even when the fans are stationary. This can only be ruled out if
the air duct is closed (by means of a shut-off flap).
Bypass of the heat recovery
A summer bypass of the heat recovery is part of this appliance. Optionally it
could be controlled automatically. The effectiveness of this appliance’s
bypass for night cooling of buildings has not been tested within the scope of
this testing.
ComfoAir XL 800
www.passivehouse.com
Passive House Institute
Dr.Wolfgang Feist
64283 Darmstadt
Germany
Documents / Resources
|
Passivehouse 0459vl03 ComfoAir XL 800 Certified Passive House
Component
[pdf] Instructions
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