Passive ventilation systems with heat recovery and night cooling

In building design the requirements for energyconsumption for ventilation, heating and coolingand the requirements for increasingly betterindoor climate are two opposing factors.This paper presents the schematic layout andsimulation results of an innovative multifunctionalventilation concept with little energyconsumption and with satisfying indoor climate.The concept is based on using passivemeasures like stack and wind driven ventilation,effective night cooling and low pressureloss heat recovery using two fluid coupledwater-to-air heat exchangers developed at theTechnical University of Denmark. Throughbuilding integration in high performance officesthe system is optimized to incorporatemultiple functions like heating, cooling andventilation, thus saving the expenses of separatecooling and heating systems. The simulationresults are derived using the state-of-theastbuilding simulation program ESP-r tomodel the heat and air flows and the resultsshow the feasibility of the proposed ventilationconcept in terms of low energy consumptionand good indoor climate.