The P5 system includes a buffer tank using solar and process heat plus auxiliary heating to supply a space heating loop.

P5: Process Heating Loop with Central Aux. Heating and Buffer Tank

System Type

#	Hydraulic Connection / Components	P3	P5
1	Process heating device	x	x
2	Return mixing valve	x	x
3	DHW tank with external heat exchanger		x
4	Heat distribution	x	x
5	External heat exchanger	x	x
6	Buffer tank bypass valve	x	x
7	Collector loop - Heat exchanger	x	x
8	Power station	x	x
9	Solar buffer tank	x	x
10	Auxiliary heating		x
a	Collector loop	x	x
b	Collector array	x	x
c	Space Heating Requirement		x
d	Heating Loop		x
e	DHW Consumption		x

* Collector suitable for process steam generation, for example Fresnel collector.

See image legend

x = included, o = optional