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- Philips Experimental House Research 1974ff: Passive versus Active Measures in Europe & America
- re in-house technology, such as solar collectors, heat pumps, heat recovery units and other innovative energy supply devices - i.e. mainly “active” components... ows at that time, controlled ventilation with 90% heat recovery and two soil heat exchangers (one of them a porous wall for pre-conditioning fresh air, the ot