Development And Evaluation Of Residential Ventilation Systems

For the need of energy reserving, the recently built house in China is airtight. As a result, the fresh air imported by infiltration can not satisfy the indoor air quality criterion. Mechanical ventilation system is one of the most efficient methods to the problem. The mechanical supply and exhaust system with energy recycle equipment is worthy of being advocated which not only can recycle the energy of the exhaust air but also ventilate efficiently. In this item, a new machine for mechanical supply and exhaust system with energy recovery equipment was designed and produced in the factory. Then the machine was tested in the lab. The tested parameters of the machine including airflow rate, pressure and noise all achieved the aims. Then the mechanical supply and exhaust system was installed in a house in Shanghai. The ventilation effect was tested by the means of traced gas. The results indicated that the nature ventilation rate was less than 0.2 times per hour as the result of airtight, while the ventilation rate by the mechanical supply and exhaust system was more than 1 time per hour. Whether the interior doors opened or closed did not influence the mechanical ventilation rate;the outlets set only in the living room or in each room also did not influence the mechanical ventilation rate. At last, 4 parameters were introduced for evaluation of residential ventilation systems which were thermal comfort, noise, ventilation rate and life cycle costing. When the ventilation systems all satisfied the first three criterions, the LCC was the determinant criterion.