Dimplex Solar Series, Technical Manual

Page: 50 / 72

Technical manual
Page 50 of 72
ST0133 – A 02/09
SOLAR
Figure 51 – Suitable pipe diameters for various collector field sizes
6.3 Pipe work pressure drop
To be able to determine the suitability of the circulation pump it is important to be able
to calculate the pressure drop of the pipe work. Figure 52 summarises the approximate
pressure drop
Δ p_pipe in 1m of pipe work at 0.5 and 0.7m/s assuming that the glycol
pressure drop is 30% higher than that of water.
Figure 52 – Pressure drop copper pipe per metre
6.4 Pipe work liquid content
To be able to reliably determine the liquid content of the system when specifying the
required amount of heat transfer medium and when sizing the expansion vessel, Figure
53 summarises the liquid content for the above selection of copper pipe.
Figure 53 – Liquid volume of copper pipe for 1 metre length