units
SI ↔ IP unit conversion helpers for psychrometric applications
(temperature, humidity ratio, mass flow, power, pressure, volume flow,
length, enthalpy, density, specific volume), plus state_to_ip()
to convert a complete moist-air state at once.
API Reference
SI ↔ IP unit conversion helpers for psychrometric applications.
Pure conversion functions, no state, no dependencies beyond stdlib. Conversion
factors come from NIST SP 811 (2008). Each pair (X_to_Y / Y_to_X) round-trips
to better than 1 part in 10⁶.
- Conventions:
SI — °C, kg/kg, kJ/kg dry air, Pa, kg/s, m³/h, m, kg/m³, m³/kg
IP — °F, gr/lb (grains per pound), BTU/lb dry air, psi/inHg, lb/h,
Use state_to_ip() to convert an entire MoistAirState to a dict
of IP-unit values in one shot.
-
pyedautils.units.c_to_f(c: float) → float[source]
Celsius → Fahrenheit.
-
pyedautils.units.f_to_c(f: float) → float[source]
Fahrenheit → Celsius.
-
pyedautils.units.c_to_k(c: float) → float[source]
Celsius → Kelvin.
-
pyedautils.units.k_to_c(k: float) → float[source]
Kelvin → Celsius.
-
pyedautils.units.kgkg_to_grlb(x: float) → float[source]
kg water / kg dry air → grains water / lb dry air (mass ratio).
1 lb = 7000 grains; the mass ratio is dimensionless so the factor is 7000.
-
pyedautils.units.grlb_to_kgkg(x: float) → float[source]
grains water / lb dry air → kg water / kg dry air.
-
pyedautils.units.kgkg_to_gkg(x: float) → float[source]
kg / kg → g / kg (convenience).
-
pyedautils.units.gkg_to_kgkg(x: float) → float[source]
g / kg → kg / kg (convenience).
-
pyedautils.units.kgs_to_lbh(m: float) → float[source]
kg/s → lb/h.
-
pyedautils.units.lbh_to_kgs(m: float) → float[source]
lb/h → kg/s.
-
pyedautils.units.kgs_to_kgh(m: float) → float[source]
kg/s → kg/h.
-
pyedautils.units.kgh_to_kgs(m: float) → float[source]
kg/h → kg/s.
-
pyedautils.units.kw_to_btuh(p: float) → float[source]
kW → BTU/h.
-
pyedautils.units.btuh_to_kw(p: float) → float[source]
BTU/h → kW.
-
pyedautils.units.pa_to_kpa(p: float) → float[source]
Pa → kPa.
-
pyedautils.units.kpa_to_pa(p: float) → float[source]
kPa → Pa.
-
pyedautils.units.pa_to_psi(p: float) → float[source]
Pa → psi.
-
pyedautils.units.psi_to_pa(p: float) → float[source]
psi → Pa.
-
pyedautils.units.pa_to_inhg(p: float) → float[source]
Pa → inches of mercury (at 60 °F).
-
pyedautils.units.inhg_to_pa(p: float) → float[source]
inches of mercury (at 60 °F) → Pa.
-
pyedautils.units.m3h_to_cfm(v: float) → float[source]
m³/h → CFM (ft³/min).
-
pyedautils.units.cfm_to_m3h(v: float) → float[source]
CFM (ft³/min) → m³/h.
-
pyedautils.units.m_to_ft(m: float) → float[source]
metre → foot.
-
pyedautils.units.ft_to_m(ft: float) → float[source]
foot → metre.
-
pyedautils.units.kjkg_to_btulb(h: float) → float[source]
kJ/kg → BTU/lb.
-
pyedautils.units.btulb_to_kjkg(h: float) → float[source]
BTU/lb → kJ/kg.
-
pyedautils.units.kgm3_to_lbft3(rho: float) → float[source]
kg/m³ → lb/ft³.
-
pyedautils.units.lbft3_to_kgm3(rho: float) → float[source]
lb/ft³ → kg/m³.
-
pyedautils.units.m3kg_to_ft3lb(v: float) → float[source]
m³/kg → ft³/lb (reciprocal of density conversion).
-
pyedautils.units.ft3lb_to_m3kg(v: float) → float[source]
ft³/lb → m³/kg.
-
pyedautils.units.state_to_ip(s: MoistAirState) → dict[source]
Convert a MoistAirState (SI) to a dict of IP-unit values.
The returned dict has explicit unit suffixes in the keys so it can be
handed directly to a UI/template without losing context.
