Abstract
Modern Danish houses are often built with a great respect for insulation and air tightness. Because of this it can be necessary to install mechanical ventilation systems in order to obtain a good indoor air quality. To meet the demand for low energy consumption, air-to-air heat exchangers are often added to the ventilation systems. Heat exchangers typically operate with a thermal efficiency of 0.6-0.7. However it is possible to achieve further energy savings by preheating the cold ventilation air before it reaches the heat exchanger. This preheating could be achieved by leading the cold air through surroundings with a temperature higher than the external air temperature. Surroundings of this kind can be found in attics, crawl spaces, underground ducts etc. Analysis have been made of the preheating of the ventilation air in 3 of 6 monitored low energy houses at Hjortekaer, about 20 km north of Copenhagen. The houses each had different types of ventilation systems with heat exchangers, namely preheating in an attic, preheating in a crawl space and a traditional simple ventilation system in a low energy house. Furthermore, a theoretical analysis of the preheating in an underground duct system has been made. Investigations showed that compatibility is
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Citation Formats
Wittchen, K.
Fresh air supply in airtight, well insulated houses; Friskluftforsyning i taette, velisolerede huse.
Denmark: N. p.,
1988.
Web.
Wittchen, K.
Fresh air supply in airtight, well insulated houses; Friskluftforsyning i taette, velisolerede huse.
Denmark.
Wittchen, K.
1988.
"Fresh air supply in airtight, well insulated houses; Friskluftforsyning i taette, velisolerede huse."
Denmark.
@misc{etde_10140539,
title = {Fresh air supply in airtight, well insulated houses; Friskluftforsyning i taette, velisolerede huse}
author = {Wittchen, K}
abstractNote = {Modern Danish houses are often built with a great respect for insulation and air tightness. Because of this it can be necessary to install mechanical ventilation systems in order to obtain a good indoor air quality. To meet the demand for low energy consumption, air-to-air heat exchangers are often added to the ventilation systems. Heat exchangers typically operate with a thermal efficiency of 0.6-0.7. However it is possible to achieve further energy savings by preheating the cold ventilation air before it reaches the heat exchanger. This preheating could be achieved by leading the cold air through surroundings with a temperature higher than the external air temperature. Surroundings of this kind can be found in attics, crawl spaces, underground ducts etc. Analysis have been made of the preheating of the ventilation air in 3 of 6 monitored low energy houses at Hjortekaer, about 20 km north of Copenhagen. The houses each had different types of ventilation systems with heat exchangers, namely preheating in an attic, preheating in a crawl space and a traditional simple ventilation system in a low energy house. Furthermore, a theoretical analysis of the preheating in an underground duct system has been made. Investigations showed that compatibility is best between heating demand and possible energy gain when the preheating comes from a ground-connected system (crawl spaces or an underground duct system). Ventilation systems of this type will, beside the preheating gains, offer the opportunity of cooling the house in periods with high ambient temperatures. (AB) 57 p.}
place = {Denmark}
year = {1988}
month = {Dec}
}
title = {Fresh air supply in airtight, well insulated houses; Friskluftforsyning i taette, velisolerede huse}
author = {Wittchen, K}
abstractNote = {Modern Danish houses are often built with a great respect for insulation and air tightness. Because of this it can be necessary to install mechanical ventilation systems in order to obtain a good indoor air quality. To meet the demand for low energy consumption, air-to-air heat exchangers are often added to the ventilation systems. Heat exchangers typically operate with a thermal efficiency of 0.6-0.7. However it is possible to achieve further energy savings by preheating the cold ventilation air before it reaches the heat exchanger. This preheating could be achieved by leading the cold air through surroundings with a temperature higher than the external air temperature. Surroundings of this kind can be found in attics, crawl spaces, underground ducts etc. Analysis have been made of the preheating of the ventilation air in 3 of 6 monitored low energy houses at Hjortekaer, about 20 km north of Copenhagen. The houses each had different types of ventilation systems with heat exchangers, namely preheating in an attic, preheating in a crawl space and a traditional simple ventilation system in a low energy house. Furthermore, a theoretical analysis of the preheating in an underground duct system has been made. Investigations showed that compatibility is best between heating demand and possible energy gain when the preheating comes from a ground-connected system (crawl spaces or an underground duct system). Ventilation systems of this type will, beside the preheating gains, offer the opportunity of cooling the house in periods with high ambient temperatures. (AB) 57 p.}
place = {Denmark}
year = {1988}
month = {Dec}
}