Field-based study on the energy-saving effects of CO_2 demand controlled ventilation in an office with application of Energy recovery ventilators

摘要

Field studies were carried out to investigate the thermal performance of ceiling-based HVAC systems, which typically consist of package air-conditioners and an energy recovery ventilator (ERV), and to test the energy-saving efficiency of CO_2-demand controlled ventilation systems with integrated ERV systems. Measurements from sensors placed in both the occupied zone (0-1.8 m) and the upper ventilation zone (at ceiling height) were taken in an environmentally controlled, open-type office, configured with workstation furniture and partitions. The distributions of temperature, relative humidity (RH), and CO_2 concentration were assessed throughout the test site for four scenarios. Tests were conducted to investigate the effects of the ERV, heat loss from the ducts, CO_2 demand control strategies, and contaminant patterns generated in a real office. Measurements showed that, with the application of an ERV system, the energy consumption of the air conditioning system could be reduced by 20-30% and that of the ventilation system, i.e. outdoor air load, likewise reduced by 60-70%.