.Greenhouses.Components.HVAC.CHP .Greenhouses.Components.HVAC.CHPThe CHP model does not consider part-load operation (ON/OFF regulation is assumed). Thus, constant natural gas consumption and total efficiency are assumed. The electrical efficiency is computed assuming a constant second-law efficiency, whose value is computed using the nominal operating conditions.
The gas source is assumed to be at a constant temperature of 500ºC. The primary side fluid is modeled by means of 1-D incompressible fluid flow model (Cell1DimInc), in which a dynamic energy balance and static mass and momentum balances are applied on the fluid. The heat transfer in the primary fluid is modeled with a constant heat transfer coefficient. However, it can be changed to other heat transfer models through the HeatTransfer parameter in the fluid model.
Furthermore, the model includes a Boolean input connector on_off, which defines the operational state of the CHP. In the equations, the Boolean input is translated to a variable value together with a first order block, which can take into account a start-up time constraint. The model also includes a real output connector Wdot_el, which outputs the value of the generated electrical power. This connector is useful, for example, in the case where a heat pump is powered by the CHP.
| Name | Description |
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 Medium | Medium in the component |