'BreathingWindow' Highly effective room ventilation system for all earth climates

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: healthy ventilation; energy saving; building-cost reduction; fine-wire heat exchanger. Symposium; Iceland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.5450; http://web.byv.kth.se/bphys/reykjavik/pdf/art_150.pdf

topic: indoor climate SUMMARY: The “breathing window ” (BW) is a smart, decentralised balanced ventilation system in the skin of building. This new device gives houses and offices a custom-made ventilation system acting on indoor-air quality Each room has its own high-tech breathing window. The BW is not yet on the market although the experimental zero-production has started. The winding process of 15 km copper thread on the “fine-wire heat exchanger ” is a challenge. This new air/air heat exchanger weighs less than 0.8 kg and is compact enough to be cleaned in a dishwasher. It also measures and acts on the CO2 concentration inside the room; it could even act as a fire alarm. The h/w/d dimensions of the first generation BWs are 750/200/180 mm, respectively. The BW can be mounted in a window post or in an outer wall. After having tested prototypes in Iceland and in the Netherlands the predicted 95 % heat-transport efficiency seems attainable. At a 20°C difference between inside and outside air temperatures two 4W fans exchange some 50 m3/h making the thermal energy saving 320 W/h. Traditional power plants have an efficiency of about 40% resulting in a net energy saving of the BW of 300 W/h. Therefore, the ”overall energy efficiency ” of the BW is 89%. The fine-wire heat exchanger has only an 18 Pa pressure difference. The fans in our current BW prototype cause 30 dB noise, which needs to be addressed in the next prototypes.