Description Usage Arguments Details Value See Also Examples

Calculate values of heat flux emitted by overhead pipeline segment (surrounded by air) as a function of construction, operation, and technical condition specifications according to Appendix 5.1 of 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.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ```
m278hlair(
t1 = 110,
t2 = 60,
t0 = 5,
insd1 = 0.1,
insd2 = insd1,
d1 = 0.25,
d2 = d1,
lambda1 = 0.09,
lambda2 = 0.07,
k1 = 1,
k2 = k1,
lambda0 = 26,
len = 1,
duration = 1
)
``` |

`t1` |
temperature of heat carrier (water) inside the supplying pipe, [ |

`t2` |
temperature of heat carrier (water) inside the returning pipe, [ |

`t0` |
temperature of environment, [ |

`insd1` |
thickness of the insulator which covers the supplying pipe, [ |

`insd2` |
thickness of the insulator which covers the returning pipe, [ |

`d1` |
external diameter of supplying pipe, [ |

`d2` |
external diameter of returning pipe, [ |

`lambda1` |
thermal conductivity of insulator which covers the supplying pipe
[ |

`lambda2` |
thermal conductivity of insulator which covers the returning pipe
[ |

`k1` |
technical condition factor for insulator of supplying pipe, [].
Type: |

`k2` |
technical condition factor for insulator of returning pipe, [].
Type: |

`lambda0` |
thermal conductivity of environment, [ |

`len` |
length of pipeline segment, [ |

`duration` |
duration of heat flux emittance, [ |

Details on using `k1`

and `k2`

are the same as for
`m278hlcha`

.

Heat flux emitted by pipeline segment during `duration`

, [*kcal*].
If `len`

of pipeline segment is 1 *m* and `duration`

of
heat flux emittance is set to 1 *hour* then the return value is equal
to that in [*kcal/m/h*] units and so comparable with values of
heat flux listed in
Minenergo Order 325.
Type: `assert_double`

.

Other Minenergo:
`m278hlcha()`

,
`m278hlund()`

,
`m278insdata`

,
`m278inshcm()`

,
`m278soildata`

,
`m325beta()`

,
`m325dropt()`

,
`m325nhldata`

,
`m325nhl()`

,
`m325testbench`

1 2 | ```
m278hlair()
# [1] 138.7736
``` |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.