CO2示踪气体法测定室内新风计算方法研究

新风是评价室内微环境空气质量的重要指标之一,精确测定室内新风量在室内环境污染、通风空调和建筑节能等领域具有非常重要的意义.本文以CO2作为示踪气体,首先利用干冰升华和人体呼吸产生CO2这2种方法对室内新风进行测定,而后运用盒子模式,分别用非线性回归法、差分法、国标法和稳态法计算新风量,最后根据计算结果,讨论了不同计算方法的误差来源及优缺点.结果表明,CO2作为示踪气体测定新风量,不同的计算方法得到的结果差别较大：非线性回归法与其它方法相比最为精确,差分法其次,国标法计算的新风量偏低,而稳态法计算的新风量偏高.

Study on Calculation Method for Measuring Air Ventilation Rate with Trace Gas of CO2

Air ventilation rate is one of the most important indexes to evaluate the indoor air quality. Measuring indoor air ventilation rate accurately is significant in the fields of indoor environmental pollution, heating and ventilating, and building energy conservation et al. In this paper, CO2 was selected as the trace gas to measure the air ventilation rate, this kind of gas could be obtained from processes of dry ice sublimation and human breathing. And then, the box model was applied and the experimental data was analyzed by the methods of nonlinear regression, difference, GB and steady state, respectively. According to the results, the error sources, advantages and disadvantages for different calculation methods were discussed. The results indicated the nonlinear regression method had highest precision among the above methods, and the next one was difference method. In addition, comparing with the standard value, the calculation results of GB method was relatively lower, but that of the steady state method was relatively higher.