Functional Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 274

Fig. 18 Connection of the trivalent buffer tank [ 12 ]. A Domestic cold water inlet, B domestic cold
water users, C heating system, 1 buffer tank, 2 HP unit, 3 additional burner, 4 opened expansion
tank, 5 circulation pumps, 6 hydraulic safety group, 7 solar panels, and 8 solar circulation pump

3 System Operating and Control

Nicolae Badea, Emil Ceanga, Marian Barbu and Sergiu Caraman

3.1 Operating Modes of the CHP Unit

Depending upon requirements, the mCHP unit can operate using different types of
operating modes (electricity and/or heat-driven). Time-variant operating modes
may be implemented by means of an energy management system, which selects the
optimum operating mode for the speci c requirements.

￿ Heat-driven operating mode

The heat demand is always the control variable for CHP operating in the heat-
driven operating mode. The generated electricity has to be supplied for own use
or to be fed into the grid.