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本文讨论了低温（一４℃以下）空气湿度的计算方法和测定方法，建立了结霜风洞及其测定系统，通过对冷气流的湿度测定，为完善低温空气的焓湿图提供了可靠的理论依据和试验基础。
This paper discusses the calculation method and determination method of air humidity at low temperature (below 4 ℃), establishes the frosting wind tunnel and its measurement system, and provides a reliable theory to improve the psychrometric chart of low temperature air by measuring the humidity of cold air flow Basis and test basis.