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Description	ERV is a system which provides controlled ventilation. This system is combined with a heat exchanger for reclaiming energy from exhaust airflows. By using the heated fresh air, less fuel is consumed in the boiler to achieve or maintain the desired operating temperature. These systems are closely related to the Heat Recovery Systems. However ERVs are not dehumidifier; they also transfer latent heat of the exhaust air. ERVs are also common in colder regions and for very tight houses with less than 0.5 air change per hour to provide adequate ventilation with already heated fresh air.
Advantages	The cost is up to $2,000 for these units, but the costs of running the ventilation can be offset by savings on heating and cooling in areas where ventilation is needed. Closely related are Heat Recovery Ventilators (HRVs) that, in addition, transfer also humidity between inbound and outbound stream.
Disadvantages	Very few suppliers are aware of this type of equipment.
Characteristic features	ERVs and HRVs can be stand-alone devices, or they can be added to existing HVAC systems
Application barriers
Information sources	http://www.enob.info/de/neue-technologien/projekt/details/feuchte-rueckgewinnung-mit-membrantechnik-fuer-die-wohnraumlueftung/ http://energyrecoveryvent.sustainablesources.com/ http://www.mitsubishielectric.ca/en/hvac/erv/how_it_works.html
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Trade:	Building services

Parameter	Minimal Value	Maximal Value	Unit
Voltage	115/60	575/60	V/Hz
Power Consumption	200	7500	W
Heat Recovery Rate	50	90	%
Maximum Heat Recovery Rate			%
Sound Power Level	34	58	dBA
Volume Flow	250	30000	m3/h
Minimum Wall Thickness	-	-	mm
Dimensions	700/700/300	2000/3000/6000	mm
Investment Cost	600	25000	€
Operational Cost	100	1000	€/year
Replacement Cost	20	400	€/year
Life Expectancy	7	15	years

Deterioration	Description
Causes
Parameter
Degradation Rate
Measurement

The Design4Energy project aims to address evolutionary life-cycle evolutionary design methodology able to create energy-efficient buildings flexibly connected with the neighbourhood energy system.

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