====== Equithermal Curve (v1.0) ======

{{:cs:mervis-ide:35-help:equithermalcurve.png}}

==== Full Name ====

Lib.Mervis.v1_0.EquithermalCurve

==== Required Project References ====

  * Lib.Mervis

===== Description =====

Block for calculating the heating medium temperature according to the equithermal curve.

===== Usage in ST =====

<code>
program test
    var
        eq: lib.mervis.v1_0.EquithermalCurve;
    end_var

    eq();
end_program
</code>

===== Inputs =====

|Inputs  |Name  |Data Type|Retain|Mandatory Connection|Meaning                         |
|In      |real  |No       |Yes   |Outdoor temperature |                                |
|t_i     |real  |Yes      |No    |Calculated indoor temperature|                        |
|t_emin  |real  |Yes      |No    |Minimum outdoor temperature |                          |
|t_w1max |real  |Yes      |No    |Maximum heating medium temperature |                  |
|t_w2max |real  |Yes      |No    |Minimum heating medium temperature |                  |
|n       |real  |Yes      |No    |Temperature exponent               |                  |

===== Outputs =====

|Outputs |Name     |Data Type|Meaning                                  |
|t_flow  |real     |Calculated heating medium temperature              |
|t_return|real     |Calculated return heating medium temperature        |

===== Detailed Function Description =====

The block calculates the heating medium temperature based on the outdoor temperature. Recommended values for the parameter //n//:

^ Heating Type                          ^ Parameter //n// Value ^ 
| Underfloor heating                    | 1.10                   |
| Panel radiators                       | 1.26 to 1.33           |
| Tubular bathroom radiators            | 1.20 to 1.30           |
| Radiators according to DIN 4703       | 1.30                   |
| Convectors                            | 1.30 to 1.50           |