除了考虑蒸发瓶的体积，加热温度和冷凝管温度外，还需要分别考虑是哪一种溶剂在被蒸发 然后根据溶剂本身的蒸发热进行计算 Q = flow rate x heat of vaporization x density Q = heat load in Watt flow rate: in ml/hour heat of vaporization: in Kcal/g density: in g/ml Example Collecting 300 ml of methylene chloride in 30 minutes 1. Convert volume to weight: 300 ml x density of 1.33 g/ml = 399 g 2. Convert minutes to hours: 399 g in 30 min = 798 g/hr 3. Multiply by the latent heat of vaporization: 798 g/hr x 89 cal/g = 71022 cal/hr 4. Divide by 1000 to get Kcal: 71022 / 1.000 = 71,022 kcal/hr 5. Multiply by 1.16 to get Watts: 71,022 x 1.16 = 82 Watt Add a security factor of at least 20% for loss of cooling capacity due to high ambient, long tubing, etc.: 82 x 1.2 = 98 Watt
除了考虑蒸发瓶的体积，加热温度和冷凝管温度外，还需要分别考虑是哪一种溶剂在被蒸发 然后根据溶剂本身的蒸发热进行计算 Q = flow rate x heat of vaporization x density Q = heat load in Watt flow rate: in ml/hour heat of vaporization: in Kcal/g density: in g/ml Example Collecting 300 ml of methylene chloride in 30 minutes 1. Convert volume to weight: 300 ml x density of 1.33 g/ml = 399 g 2. Convert minutes to hours: 399 g in 30 min = 798 g/hr 3. Multiply by the latent heat of vaporization: 798 g/hr x 89 cal/g = 71022 cal/hr 4. Divide by 1000 to get Kcal: 71022 / 1.000 = 71,022 kcal/hr 5. Multiply by 1.16 to get Watts: 71,022 x 1.16 = 82 Watt Add a security factor of at least 20% for loss of cooling capacity due to high ambient, long tubing, etc.: 82 x 1.2 = 98 Watt
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