Symbols and Conversion Factors (1) for Psyc. Calculator

abr	definition	SI	IP	SI2IP	IP2SI
DB	dry-bulb temperature	C	F	db_c*1.8+32	(db_f-32)/1.8
DP	dew-point temperature	C	F	dp_c*1.8+32	(dp_f-32)/1.8
WB	wet-bulb temperature	C	F	wb_c*1.8+32	(wb_f-32)/1.8
RH	relative humidity	%	%	1.0	1.0
W	humidity ratio	ratio	ratio	1.0	1.0
H	enthalpy	kJ/kg	BTU/lb	eq 1	eq 2
E	vapor pressure	kPa	psi	0.145036	6.8948
DS	degree of saturation	%	%	1.0	1.0
ES	saturated vapor pressure	kPa	psi	0.145036	6.8948
V	specific volume	m^3/kg	ft^3/lb	16.018463	0.623719
DA	density of moist air	kg/m^3	lb/ft^3	0.062428	16.032859
WS	saturated humidity ratio	ratio	ratio	1.0	1.0
Q	specific humidity	ratio	ratio	1.0	1.0
X	absolute humidity	kg/m^3	lb/ft^3	0.623719	16.032859
P	atmospheric pressure	kPa	psi	0.145036	6.8948
ALL	all attributes

eq. 1 (2):
w = (h-1.006*db_si)/(2501+1.805*db_si)
db_ip = (db_si*1.8+32)
h_ip = 0.240*db_ip+w*(1061+0.44*db_ip)

eq. 2(2):
w = (h-0.240*db_ip)/(2501+1.805*db_ip)
db_si = (db_ip-32)/1.8
h_si = 1.006*db_si)+w*(2501+1.805*db_si)

Reference
1. CRC 1988. Handbook of Physics and Chemistry.
2. ASHRAE. 1993. Handbook Fundamentals. Chapter 6. American Society of Heating,
Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA 30329.