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HEAD

Description​

HEAD is a keyword that is used defining PUMP and COMPRESSOR CHARTS. Head can either be given as a M, KJ_PER_KG, JOULE_PER_KG.

For compressors, it is used in two separate ways under the MODELS or section:

  • Defining the UNITS of HEAD
  • Defining the set of values for HEAD under CURVES section. Here, this must be given as a set of values whose length (number of variables) match the correlating EFFICIENCY and RATE values.

For pumps, it is defined under the FACILITY_INPUTS section.

Format​

COMPRESSORS​

MODELS:
  - NAME: <name of chart, for reference>
    ...
    UNITS:
      HEAD: <polytropic head unit, M, KJ_PER_KG, JOULE_PER_KG supported>
      ...
    ....

PUMPS​

FACILITY_INPUTS:
  - NAME: <pump chart name>
    ...
    UNITS:
        HEAD: <polytropic head unit, M, KJ_PER_KG, JOULE_PER_KG supported>
        ...

Example​

COMPRESSORS​

MODELS:
  - NAME: predefined_variable_speed_compressor_chart
    TYPE: COMPRESSOR_CHART
    CHART_TYPE: VARIABLE_SPEED
    UNITS:
      RATE: AM3_PER_HOUR
      HEAD: M
      EFFICIENCY: FRACTION
    CURVES:
      - SPEED: 7500
        RATE: [2900, 3503, 4002, 4595.0]
        HEAD: [8412.9, 7996, 7363, 6127]
        EFFICIENCY: [0.72, 0.75, 0.74, 0.70]