R/m325tracefw.R
m325tracefw.Rd
Trace values of thermal-hydraulic regime (temperature, pressure, consumption) in the bunched pipeline along the flow direction using norms of heat flux values prescribed by Minenergo Order 325.
m325tracefw(
sender = c(0, 1),
acceptor = c(1, 2),
temperature = c(70, NA_real_),
pressure = c(pipenostics::mpa_kgf(6), NA_real_),
consumption = c(20, NA_real_),
d = rep_len(100, 2),
len = rep_len(72.446, 2),
year = rep_len(1986, 2),
insulation = rep_len(0, 2),
laying = rep_len("tunnel", 2),
beta = rep_len(FALSE, 2),
exp5k = rep_len(TRUE, 2),
roughness = rep_len(0.001, 2),
inlet = c(0.5, 1),
outlet = c(1, 1),
elev_tol = 0.1,
method = "romeo",
verbose = TRUE,
csv = FALSE,
file = "m325tracefw.csv",
maxcores = 2
)
identifier of the node which heat carrier flows out.
Type: any type that can be painlessly coerced to character by
as.character
.
identifier of the node which heat carrier flows in. According to topology
of test bench considered this identifier should be unique for every row.
Type: any type that can be painlessly coerced to character by
as.character
.
snapshot of thermal-hydraulic regime state: temperature of heat carrier
(water) sensor-measured on the root node, [°C].
Type: assert_double
.
Use NA_float_
s for nodes without temperature sensor.
snapshot of thermal-hydraulic regime state: sensor-measured
absolute pressure
of heat carrier (water) inside the pipe (i.e. acceptor's incoming edge),
[MPa].
Type: assert_double
.
Use NA_float_
s for nodes without pressure sensor.
snapshot of thermal-hydraulic regime state:
sensor-measured amount of heat carrier (water) on root node that is
transferred by pipe (i.e. acceptor's incoming edge) during a period,
[ton/hour].
Type: assert_double
.
Use NA_float_
s for nodes without consumption sensor.
internal diameter of pipe (i.e.diameter of acceptor's incoming edge),
[mm].
Type: assert_double
.
pipe length (i.e. length of acceptor's incoming edge), [m].
Type: assert_double
.
year when the pipe (i.e. acceptor's incoming edge) is put in operation
after laying or total overhaul.
Type: assert_integerish
.
identifier of insulation that covers the exterior of pipe (i.e. acceptor's incoming edge):
0
no insulation
1
foamed polyurethane or analogue
2
polymer concrete
Type: assert_subset
.
type of pipe laying depicting the position of pipe in space. Only five types of pipe laying are considered:
air
,
channel
,
room
,
tunnel
,
underground
.
Type: assert_subset
.
logical indicator: should they consider additional heat losses of fittings
located on this pipe (i.e. acceptor's incoming edge)?
Type: assert_logical
.
logical indicator for regime of pipe (i.e. acceptor's incoming edge): if
TRUE
pipe is operated more that 5000
hours per year.
Type: assert_logical
.
roughness of internal wall of pipe (i.e. acceptor's incoming edge),
[m].
Type: assert_double
.
elevation of pipe inlet, [m].
Type: assert_double
.
elevation of pipe outlet, [m].
Type: assert_double
.
maximum allowed discrepancy between adjacent outlet and inlet elevations of
two subsequent pipes in the traced path, [m].
Type: assert_number
.
method of determining Darcy friction factor:
romeo
vatankhan
buzelli
Type: assert_choice
.
For more details see dropp
.
logical indicator: should they watch tracing process on console?
Type: assert_flag
.
logical indicator: should they incrementally dump results to csv-file
while tracing?
Type: assert_flag
.
name of csv-file which they dump results to.
Type: assert_character
of length 1 that can be used safely
to create a file and write to it.
maximum cores of CPU to use in parallel processing.
Type: assert_count
.
data.frame
containing results of tracing in
long format
(narrow format)
mostly like it returned by function m325tracebw
:
node
identifier of the node for which regime parameters is calculated.
Values in this vector are identical to those in argument acceptor
.
Type: assert_character
.
tracing
identifiers of nodes from which regime parameters are
traced for the given node. Identifier sensor
is used when
values of regime parameters for the node are sensor readings.
Type: assert_character
.
backward
identifier of tracing direction. It constantly equals to FALSE
.
Type: assert_logical
.
aggregation
aggregation method associated with values of calculated temperature or
pressure in data.frame
's row for the node. For forward tracing
the only option is identity
.
Type: assert_character
.
temperature
snapshot of thermal-hydraulic regime state: traced temperature of heat
carrier (water) that is associated with the node, [°C]
Type: assert_double
.
pressure
snapshot of thermal-hydraulic regime state: traced pressure of heat
carrier (water) that is associated with the node, [MPa]
Type: assert_double
.
consumption
snapshot of thermal-hydraulic regime state: traced pressure of heat
carrier (water) that is associated with the node, [ton/hour]
Type: assert_double
.
job
value of tracing step counter. For forward tracing value of job
counts the number of traced paths from root node.
Type: assert_integer
.
The calculated (values of) regime may be considered as representation of district heating process in conditions of hypothetically perfect technical state of pipe walls and insulation.
They consider the topology of district heating network much similar to
m325testbench
:
Tracing starts from sensor-equipped root node and goes forward, i.e along
the flow direction. Function m325traceline
serves under the
hood for tracing identified linear segments from root node to every
terminal node. Hence they only need root node to be equipped with sensors.
Sensors at other nodes are redundant in forward tracing, since the tracing
algorithm by no means consider them for tracing.
Moreover in the forward tracing algorithm they assume the flow of heat carrier is distributed proportionally to the cross-sectional area of the outgoing pipeline. Actually, a lot of reasons may cause significant deviations from this assumption. As a result, the sequence of paired backward/forward tracing may be divergent for regime parameters.
Though some input arguments are natively vectorized their individual values
all relate to common part of district heating network, i.e. associated with
common object. It is due to isomorphism between vector representation and
directed graph of this network. For more details of isomorphic topology
description see m325testbench
.
They are welcome to couple the algorithm with functionality of data.table.
Other Regime tracing:
m325tracebwm()
,
m325tracebw()
,
m325traceline()
# \donttest{
# Minimum two nodes should be in district heating network graph:
m325tracefw(verbose = FALSE)
#> node tracing backward aggregation temperature pressure consumption job
#> 1 1 sensor FALSE identity 70.00000 0.5883990 20 0
#> 2 2 1 FALSE identity 69.71603 0.5813153 20 1
# node tracing backward aggregation temperature pressure consumption job
# 1 1 sensor FALSE identity 70.00000 0.5883990 20 0
# 2 2 1 FALSE identity 69.71603 0.5813153 20 1
# Example with the test bench:
nx <- pipenostics::m325testbench
# avoid using numeric identifiers for nodes:
nx$sender <- paste0("N", nx$sender)
nx$acceptor <- paste0("N", nx$acceptor)
# Alter units:
nx$d <- 1e3 * nx$d # convert [m] to [mm]
# Perform backward tracing to get regime on root node:
bw_report <- do.call("m325tracebw", c(as.list(nx), verbose = FALSE))
# Put the traced values to the root node of the test bench:
root_node_idx <- 12
root_node <- paste0("N", root_node_idx)
regime_param <- c("temperature", "pressure", "consumption")
nx[root_node_idx, regime_param] <-
subset(bw_report,
node == root_node & aggregation == "median",
regime_param)
rm(root_node, root_node_idx)
# Trace the test bench forward for the first time:
fw_report <- do.call("m325tracefw",
c(as.list(nx), verbose = FALSE, elev_tol = .5))
# Let's compare traced regime at terminal nodes back to test bench:
report <- subset(
rbind(bw_report, fw_report),
node %in% subset(nx, !(acceptor %in% sender))$acceptor &
aggregation == "identity"
)
regime_delta <- colMeans(
subset(report, backward, regime_param) -
subset(report, !backward, regime_param)
)
print(regime_delta)
#> temperature pressure consumption
#> -4.640201e-01 -5.208802e-03 -5.465713e-16
# temperature pressure consumption
# -4.640201e-01 -5.208802e-03 -5.465713e-16
stopifnot(sqrt(regime_delta %*% regime_delta) < 0.5)
# }