Thermoeconomic design of an earth to air heat exchanger used to preheat ventilation air in low energy buildings

摘要

Geothermal energy is one of the renewable sources of energy that can generate electricity and heat with a low impact on the environment. An important percent of the primary energy consumption is used to provide buildings heating and cooling. Thermal energy demand for buildings is driven by population growth and climatic conditions. For these reasons new solutions had to be found in the dwellings sector and the passive house concept has proved to be very efficient. A passive house can be equipped with geothermal systems such as heat pumps and earth to air heat exchangers. The paper presents the description and the design of an earth to air heat exchanger installed to preheat and cool the ventilation air for a passive house built within "Politehnica" University of Bucharest.