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報情術技146技術情報℃0.00.10.20.30.40.50.60.70.80.9-151.2391.2281.2171.2051.1941.1831.1721.1611.1511.140-141.3581.3461.3341.3221.3101.2981.2861.2741.2621.250-131.4881.4751.4611.4481.4351.4211.4091.3961.3831.370-121.62916.151.60015.861.5711.5571.5431.5291.5151.502-111.7821.7661.7511.7351.7191.7031.6881.6731.6581.643-101.9481.9311.9131.8971.8801.8631.8471.8301.8141.798-92.1282.1092.0902.0722.0542.0362.0182.0001.9831.965-82.3232.3032.2822.2632.2432.2242.2042.1852.1662.147-72.5342.5132.4912.4692.4482.4272.4062.3852.3642.343-62.7642.7402.7172.6932.6702.6472.6242.6012.5792.557-53.0112.9862.9602.9352.9092.8852.8602.8362.8112.788-43.2793.2523.2243.1973.1703.1433.1163.0903.0633.037-33.5683.5383.5093.4793.4503.4213.3933.3643.3363.307-23.8803.8483.8163.7843.7533.7213.6903.6593.6293.598-14.2184.1834.1484.1144.0804.0464.0123.9793.9453.913-04.5814.5434.5064.4694.4324.3954.3594.3234.2884.25304.5814.6154.6484.6824.7164.7504.7854.8204.8554.89014.9254.9614.9975.0335.0695.1055.1425.1795.2165.25425.2925.3295.3685.4065.4455.4845.5235.5625.6025.64235.6825.7725.7635.8045.8455.8875.9285.9706.0126.05546.0986.1416.1846.2286.2716.3156.3606.4046.4496.49556.5406.5866.6326.6786.7256.7726.8196.8666.9146.96267.0107.0597.1087.1577.2077.2577.3077.3577.4087.45977.5117.5627.6147.6667.7197.7727.8257.8797.9337.98788.0428.0978.1528.2088.2638.3208.3778.4338.4918.54998.6058.6658.7238.7828.8418.9018.9619.0219.0829.143109.2059.2679.3299.3929.4459.5189.5829.6469.7109.775119.8409.9069.97210.0410.1110.1710.2410.3110.3810.451210.5110.5810.6510.7210.7910.8710.9411.0111.0811.151311.2311.3011.3811.4511.5311.6011.6811.7511.8311.911411.9812.0612.1412.2212.3012.3812.4612.5412.6212.701512.7812.8712.9513.0313.1213.2013.2913.3713.4613.541613.6313.7213.8113.8913.9814.0714.1614.2514.3414.441714.5314.6314.7114.8114.9014.9915.0915.1815.2815.381815.4715.5715.6715.7715.8715.9716.0716.1716.2716.371916.4716.5816.6816.7916.8917.0017.1017.2117.3217.422017.5317.6417.7517.8617.9718.0818.1918.3118.4218.532118.6518.7618.8818.9919.1119.2319.3519.4619.5819.702219.8219.9520.0720.1920.3120.4420.5620.6920.8120.942321.0721.1921.3221.4521.5821.7121.8421.9822.1122.242422.3822.5122.6522.7822.9223.0623.1923.3323.4723.612523.7623.9024.0424.1824.3324.4724.6224.7624.9125.062625.2125.3625.5125.6625.8125.9626.1226.2726.4326.582726.7426.9027.0627.2127.3727.5327.7027.8628.0228.182828.3528.5228.6828.8529.0229.1929.3629.5329.7029.872930.0430.2230.3930.5730.7530.9231.1031.2831.4631.643031.8332.0132.1932.3832.5632.7532.9433.1333.3233.51(表1) 湿り空気線図・空気の飽和水蒸気圧(mmHg)1.ある気温の飽和水蒸気圧を求める。(例) 23.5℃の飽和水蒸気圧を求める。▲表で、縦軸:23 、横軸:0.5 の交点の値を読む。 ⇒21.71(mmHg)2.気温と相対湿度から露点温度を求める。(例) 23.5℃で相対湿度45%の場合の露点温度を求める。▲23.5℃での飽和水蒸気圧は、1. より、21.71(mmHg)相対湿度を求める式は、上記より、相対湿度45%の水蒸気圧は、21.71×0.45=9.7695(mmHg)表から、この値は10.8℃と10.9℃の間の水蒸気圧の値であり、この間に飽和水蒸気圧となることがわかります。よってこの場合、露点温度は10.8℃で、10.8℃以下になると結露します。(参考文献) 一般社団法人 日本金属屋根協会等『鋼板製屋根・外壁の設計・施工・保全の手引き MSRW 2014』相対湿度φi(%) = 水蒸気圧 hi (mmHg)/飽和水蒸気圧 Hi (mmHg)表の読み方

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