R/m278hlair.R

In omega1x/pipenostics: Diagnostics, Reliability and Predictive Maintenance of Pipeline Systems

#' @title
#'   Minenergo-278. Normative heat loss of open-air pipe
#'
#' @family Minenergo
#'
#' @description
#'  Calculate normative heat loss of the open-air supplying pipe
#'  as a function of construction, operation, and technical condition 
#'  specifications according to
#'  Appendix 5.1 of \href{https://docs.cntd.ru/document/1200035568}{Minenergo Method 278}.
#'
#'  This type of calculations is usually made on design stage of district
#'  heating network (where water is a heat carrier) and is closely related to
#'  building codes and regulations.
#'
#' @param t1
#'   temperature of heat carrier (water) inside the supplying pipe, [\emph{°C}].
#'   Type: \code{\link{assert_double}}.
#' @param t2
#'   temperature of heat carrier (water) inside the returning pipe, [\emph{°C}].
#'   Type: \code{\link{assert_double}}.
#' @param t0
#'   temperature of environment, [\emph{°C}]. In case of open-air pipe this is
#'   the ambient temperature. Type: \code{\link{assert_double}}.
#' @param insd1
#'   thickness of the insulator which covers the supplying pipe, [\emph{m}].
#'   Type: \code{\link{assert_double}}.
#' @param insd2
#'   thickness of the insulator which covers the returning pipe, [\emph{m}].
#'   Type: \code{\link{assert_double}}.
#' @param d1
#'   outside diameter of supplying pipe, [\emph{m}].
#'   Type: \code{\link{assert_double}}.
#' @param d2
#'   outside diameter of returning pipe, [\emph{m}].
#'   Type: \code{\link{assert_double}}.
#' @param lambda1
#'   thermal conductivity of insulator which covers the supplying pipe
#'   [\emph{W/m/°C}]. Type: \code{\link{assert_double}}.
#' @param lambda2
#'   thermal conductivity of insulator which covers the returning pipe
#'   [\emph{W/m/°C}]. \code{\link{assert_double}}.
#' @param k1
#'   technical condition factor for insulator of supplying pipe, [].
#'   Type: \code{\link{assert_double}}.
#' @param k2
#'   technical condition factor for insulator of returning pipe, [].
#'   Type: \code{\link{assert_double}}.
#' @param lambda0
#'   thermal conductivity of environment, [\emph{W/m/°C}]. In case of overhead
#'   laying this is the thermal conductivity of open air.
#'   Type: \code{\link{assert_double}}.
#' @param len
#'  length of supplying pipe, [\emph{m}]. Type: \code{\link{assert_double}}.
#' @param duration
#'  duration of heat loss, [\emph{hour}]. Type: \code{\link{assert_double}}.
#'
#' @return
#'  Normative heat loss of the open-air layed supplying cylindrical pipe 
#'  during \code{duration}, [\emph{kcal}].
#'  If \code{len} of pipe is 1 \emph{m} (meter) as well as \code{duration} is set to
#'  1 \emph{h} (hour) (default values) then the return value is also the
#'  \emph{specific heat loss power}, [\emph{kcal/m/h}] and so comparable with those
#'  prescribed by \href{https://docs.cntd.ru/document/902148459}{Minenergo Order 325}.
#'  Type: \code{\link{assert_double}}.
#'
#' @details
#'   Details on using \code{k1} and \code{k2} are the same as for
#'   \code{\link{m278hlcha}}.
#' @export
#'
#' @examples
#'  library(pipenostics)
#'
#'  m278hlair()
#'  # [1] 138.7736
#'
m278hlair <-
  function(t1 = 110, t2 = 60, t0 = 5, insd1 = 0.1, insd2 = insd1, d1 = .25,
           d2 = d1, lambda1 = 0.09, lambda2 = 0.07, k1 = 1, k2 = k1,
           lambda0 = 26, len = 1, duration = 1
           ) {
    checkmate::assert_double(
      t1,
      lower = 0,
      upper = 450,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      t2,
      lower = 0,
      upper = 450,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      t0,
      lower = -15,
      upper = 30,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      insd1,
      lower = 0,
      upper = .5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      insd2,
      lower = 0,
      upper = .5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      d1,
      lower = .2,
      upper = 1.5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      d2,
      lower = .2,
      upper = 1.5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      lambda1,
      lower = 1e-3,
      upper = 1,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      lambda2,
      lower = 1e-3,
      upper = 1,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      k1,
      lower = 1,
      upper = 4.5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      k2,
      lower = 1,
      upper = 4.5,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      lambda0,
      lower = 1,
      upper = 100,
      finite = TRUE,
      any.missing = FALSE,
      min.len = 1L
    )
    checkmate::assert_double(
      len, lower = 0, finite = TRUE, any.missing = FALSE, min.len = 1L
    )
    checkmate::assert_double(
      duration, lower = 0, finite = TRUE, any.missing = FALSE, min.len = 1L
    )
    checkmate::assert_true(commensurable(c(
      length(t1), length(t2), length(t0), length(insd1), length(insd2),
      length(d1), length(d2), length(lambda1), length(lambda2), length(k1),
      length(k2), length(lambda0), length(len), length(duration)
    )))

    q1 <-
      pi * (t1 - t0) / (log((d1 + 2 * insd1) / d1) / (2 * k1 * lambda1) + 1 /
                          (lambda0 * (d1 + 2 * insd1)))
    q2 <-
      pi * (t2 - t0) / (log((d2 + 2 * insd2) / d2) / (2 * k2 * lambda2) + 1 /
                          (lambda0 * (d2 + 2 * insd2)))
    q <- q1 + q2
    q * len * duration
}