10.07.2015   EUROSUN 2008

System layout and boundary conditions for heating with LHS

The system layout for heating in winter shows fig. 2.

Assuming a solar input of about 500 W/m2 on the 40 m2 collector field, the heat input into the storage is about 20 kW. During 6 hours in daytime therefore 120 kWh of heat can be stored for heating the building during the night. In addition, an auxillary heater can be used. In daytime, people and equipment release enough heat to raise the temperature to a comfort level. The respective storage boundary conditions of the storage including inlet and outlet temperatures are summarized in table 2.

Table 2. Storage boundary conditions for heating.

heat input from the solar collector field in daytime to heat at night / winter season

Tin [°C]

Tout [°C]

Power input [kW]

Duration [h]

Storage capacity [kWh]

40

33.5

20

6

120

heat input to the heating system in night time / winter season (example)

Tin [°C]

Tout [°C]

Power output [kW]

Duration [h]

Storage capacity [kWh]

24

26.5

8

15

120