The reduction of the peak cooling load of the passenger compartment of a prototypical automobile is examined by considering venting of the interior and electrochromic coatings on the windows. Since the peak load occurs when the vehicle is parked in the bright sun in a hot day, an independent power source consisting of solar cells integrated on the vehicle is also considered. It is found that under the constraints of available power maximum benefit is obtained at a venting rate of about 40 l/s. The peak cooling load is then reduced by 30 %, while temperatures of interior surfaces are reduced by as many as 20 Cel and of the air by up to 30 Cel. Preliminary investigation of electrochromic windows shows a peak cooling load reduction of over 40 %. It is estimated that the combined application of both techniques will reduce the peak cooling load and therefore the A/C capacity by more than a factor of two. Also, passenger comfort is significantly improved during the first ten to fifteen minutes of vehicle operation. Power requirements are evenly divided between the two techniques at about 40 W each. The entire roof area of the vehicle or one-half of it is needed if amorphous or crystalline silicon solar cells are used, respectively.
Integration of solar cells in automobiles as a means to reduce the air conditioner capacity and improve comfort
Integration von Sonnenzellen in Kraftfahrzeuge zur Verkleinerung der Klimatisierungsanlage und zur Komfortverbesserung
1989
4 Seiten, 2 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
Design of Automobiles for Comfort
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