﻿ 000084_Calculation of Absolute Temperature,Vapor Pressure(Ice at t＜0℃),Absolute humidity,Specific Volume,Specific Heat at Constant Volume,Specific Heat at Constant Pressure,Specific Enthalpy ＆ Dry-bulb temperature-Specific Enthalpy Graph.

# Calculation of Absolute Temperature,Vapor Pressure(Ice at t＜0℃),Absolute humidity,Specific Volume,Specific Heat at Constant Volume,Specific Heat at Constant Pressure,Specific Enthalpy ＆ Dry-bulb temperature-Specific Enthalpy Graph.

## Keyword

Absolute Temperature,Vapor Pressure(Ice at t＜0℃),Absolute humidity,Specific Volume,Specific Heat at Constant Volume,Specific Heat at Constant Pressure,Specific Enthalpy
＆ Dry-bulb temperature-Specific Enthalpy Graph.

## Reference

・『JIS Z8806 湿度-測定方法』
・『湿度と蒸発』（上田政文）
・『建築設備設計マニュアル　第三版　Ⅰ空気調和編』（社団法人建築設備技術者協会）
・『理科年表　平成19年2007』（国立天文台編）
・『空気線図の読み方・使い方』（空気調和・衛生工学会）

## Remarks

・T=t+273.15.
・Saturated Vapor Pressure(kPa)={a×T^(-1)}＋{b}＋{c×10^(-2)×T}＋{d×10^(-5)×T^2}＋{e×ln(T)} Sonntag Equation.
・Vapor Pressure of Air at X% Relative humidity(kPa)=X/100*Saturated Vapor Pressure(kPa).
・Absolute Humidity of Air(kg/kg(DA))=0.622×Vapor Pressure(kPa)/(Atmospheric Pressure(kPa)-Vapor Pressure(kPa)).
・Absolute Humidity of Air(g/m^3)=804×Vapor Pressure(kPa)/((1+0.00366×Dry-bulb temperature)×Atmospheric Pressure(kPa)).
・Specific Volume(m^3/kg(DA))=0.004555×(0.622+Absolute Humidity of Air(kg/kg(DA)))×T(K).
・Specific Heat at Constant Volume(kJ/kg(DA)･℃)=0.718(kJ/kg･℃)+1.385(kJ/kg･℃)×Absolute Humidity of Air(kg/kg(DA)).
・Specific Heat at Constant Pressure(kJ/kg(DA)･℃)=1.006(kJ/kg･℃)+1.846(kJ/kg･℃)×Absolute Humidity of Air(kg/kg(DA)).
・Specific Enthalpy(kJ/kg(DA))=1.023×Dry-bulb temperature+Absolute Humidity of Air(kg/kg(DA))×(2501+1.846×Dry-bulb temperature).

## History

・2014/08/10：layout change.
・2009/03/23：Moved from www.am-consulting.co.jp to here.