AIVC - Air Infiltration and Ventilation Centre

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heat recovery

Passive stack ventilation with heat recovery.

Attempts to assess the performance of heat pipe heat recovery units for naturally ventilated buildings. The effectiveness of four heat pipe units was measured in a two zone chamber. The pressure loss characteristics of the units were determined by computa

Heat recovery and the cause of energy efficiency.

What has heat recovery done for the cause or energy efficiency? If some manufacturers or heat recovery equipment are to be believed, the savings in ventilation costs are "quite staggering".

Performance of passive stack ventilation with heat recovery system.

In order to explain the effect of heat recovery on a passive ventilation system using stack effect, and to show the factors and conditions that the heat-recovery system can be installed in a passive ventilation system, the following investigations are made. The characteristics of the airflow in houses using the passive ventilation with the heat recovery units were investigated from scale model experiments and numerical experiments. And the effect of energy saving by the heat recovery system was investigated from numerical experiments using the standard weather data of cities in Japan.

Test method of heat recovery units in single houses.

The study was to test five units used in single house mechanical ventilation systems with heat recovery. Tests were made according to CEN project prepared by CEN TC 156/WG2/AH7 including air tightness, pressure-airflow's curves and temperature ratios. A full test on frost and condensation was also realised on one unit to determine the influence of these parameters on performances. Test results, influence of wet or dry conditions and main conclusions for using these results in dimensioning, will be given.

Good indoor climate and air quality in energy efficient houses.

Two energy-efficient single-family houses (known as ESPI houses) with competitive overallcosts were set up during the study in Finland. The consumption of energy for room heating inESPI houses was reduced to a half at the construction stage, by employing simple solutionswhich can be used by every builder. The level of thermal insulation of the houses wasimproved remarkably. The houses were equipped with a controlled ventilation system and anefficient exhaust air heat recovery unit. One of the houses was oil heated and the other waselectrically heated.