density_water: Density of Saturated Liquid Water

In iemisc: Irucka Embry's Miscellaneous Functions

Density of Saturated Liquid Water

Description

This function solves for the density of water using only the temperature of the water in either units of degrees Celsius, degrees Fahrenheit, or Kelvin.

Usage

density_water(
  Temp,
  units = c("SI", "Eng", "Absolute"),
  Eng_units = c("slug/ft^3", "lbm/ft^3")
)

Arguments

Temp	numeric vector that contains the temperature (degrees Celsius, degrees Fahrenheit, or Kelvin)
units	character vector that contains the system of units [options are SI for International System of Units, Eng for English units (United States Customary System in the United States and Imperial Units in the United Kingdom), or Absolute for Absolute Units]
Eng_units	character vector that contains the unit for the density of water [options are slug/ft^3 or lbm/ft^3]

Details

The simplified equation is expressed as

\frac{\\rho^{t}}{\\rho_c} = 1 + b_1 \times \\tau^{1/3} + b_2 \times \\tau^{2/3} + b_3 \times \\tau^{5/3} + b_4 \times \\tau^{16/3} + b_5 \times \\tau^{43/3} + b_6 \times \\tau^{110/3}

where

\\rho_c = 322 \frac{kg}{m^3}

where

\\tau = 1 - \\theta

where

\\theta = \frac{T}{T_c}

where

T_c = 647.096 K

with

b_1 = 1.99274064

b_2 = 1.09965342

b_3 = -0.510839303

b_4 = -1.75493479

b_5 = -45.5170352

b_6 = -6.74694450 * 10 ^ 5

\rho' = rho^t in the equation

Water Density (mass divided by volume) [kg/m^3, slug/ft^3, or lbm/ft^3]

\rho_c

Water Density at the critical point, kg/m^3

T

the water temperature, Kelvin

T_c

the critical water temperature, Kelvin

Value

the density as a numeric vector. The units are not returned.

Note

Note: 1 lbf = 1 slug * 1 ft/sec^2, thus 1 slug = 1 lbf * sec^2 / 1 ft (Reference 2)

Thus, lbm/ft^3 = lbf*s^2/ft/ft^3

Author(s)

Irucka Embry

References

IAPWS SR1-86 (1992). "Revised Supplementary Release on Saturation Properties of Ordinary Water Substance". September 1992, http://www.iapws.org/relguide/Supp-sat.html

Examples

# Example 1 (Compare to reference standard in Reference paper)

library(iemisc)

273.16 # K

373.1243 # K

647.096 # K

Temp <- c(273.16, 373.1243, 647.096)

round::round_r3(density_water(Temp, units = "Absolute"), d = 3)


# Reference standard

999.789 # kg/m^3
958.365 # kg/m^3
322 # kg/m^3





# Example 2 - Example from the hydraulics package

library(iemisc)

rho <- hydraulics::dens(T = 25, units = "SI"); rho

rho2 <- density_water(Temp = 25, units = "SI"); rho2





# Example 3 - compare with densityH2Ov from aiRthermo

install.load::load_package("iemisc", "units")

Temp <- 180

# create a numeric vector with the units of degrees Celsius
T_C <- set_units(Temp, "degree_C")
T_C

# create a numeric vector to convert from degrees Celsius to Kelvin
T_K <- T_C
T_K

# create a numeric vector with the units of Kelvin
units(T_K) <- make_units(K)

pre <- aiRthermo::saturation_pressure_H2O(drop_units(T_K))
pre

rho_h2o <- aiRthermo::densityH2Ov(pre, drop_units(T_K), consts =
aiRthermo::export_constants()); rho_h2o

# Should not be the same as aiRthermo deals with water vapor rather than
# saturated liquid water

density_water(Temp = drop_units(T_K), units = "Absolute")

iemisc documentation built on June 22, 2024, 9:45 a.m.