Naslov
Utjecaj prisilne ventilacije na toplinsku udobnost i potrošnja energije za prostorno grijanje i hlađenje promatrane obiteljske kuće
(Effects of mechanical ventilation system on thermal comfort and space heating and cooling energy consumption in detached family house)

Autori
Blecich, Paolo ; Franković, Bernard

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
21st International symposium on heating, refrigerating and air conditioning Interklima 2011 / Andrassy, Mladen - Zagreb : Fakultet strojarstva i brodogradnje Sveučilišta u Zagrebu, 2011, 34-35

Skup
21st International symposium on heating, refrigerating and air conditioning Interklima 2011

Mjesto i datum
Zagreb, Hrvatska, 07.04.2011. - 08.04.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
mechanical ventilation; heat recovery; energy saving
(prisilna ventilacija; povrat topline; ušteda energije)

Sažetak
Hourly values of meteorological parameters from the test reference year for the City of Rijeka were used to investigate the effects of mechanical ventilation system on thermal comfort and on space heating and cooling energy consumption in a detached single-family house in the Rijeka. The analysis includes three family houses, each having a floor area of 150 m2 in two storeys, with different energy performance levels: a normative house being built with minimum requirements and the other two being built with Low-energy and Passive House standards, respectively. The normative house is not equipped with a mechanical ventilation system, and as such consumes 90 kWh/m2 of energy for space heating and 9 kWh/m2 for space cooling annually. The space heating energy consumption in the low energy house amounts to 50 kWh/m2 annually, with possible further reductions by 20 kWh/m2 if a mechanical ventilation heat recovery system is provided. The passive house, having a mechanical ventilation heat recovery system, consumes 9 kWh/m2 of energy for space heating and 8 kWh/m2 for cooling. Out of the three houses, the best thermal comfort is achieved in the passive house: the number of hours with comfortable air temperature and humidity is the biggest. The heating season is longest in the normative house, i.e. 148 days, and shortest in the passive house, only 42 days. The exhaust air heat recovery system preheats the intake fresh air, and by doing so the heating balance point temperature moves from 15 to 12 °C. Contrary to what one might expect, energy efficient houses use less energy for cooling, although the cooling season is longer: 69 days in the normative house as opposed to 96 days in the low-energy and 121 days in the passive house. In summer period, overheating of energy efficient houses can be prevented providing higher flow rates of fresh air in the mechanical ventilation system at night, which will result in a 25% reduction of the space cooling energy consumption, but also in a 100% fan power consumption increase. Instead, the house can be protected from overheating by passive solutions such as roof overhangs, window shadings and natural night ventilation.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne tehničke znanosti

POVEZANOST RADA