Design Principles Hydronic Systems

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L = 10 . g. c) The localised pressure losses of the main circuit (See calculation methods) z = 0,6 . g. g. 34 35 CHARACTERISTICS OF REVERSE RETURN CIRCUITS As has already been pointed out if their dimensions are determined with constant linear pressure losses these circuits are capable of ensuring almost equal differential pressures at the connections of their branches. e. with driveded circuits which require (as in the example) equal differential pressures or which do not vary very much. On the other hand balanced distribution cannot be provided if the sub-circuits are not uniform.

G. /m v = 0,50 m/s — Pressure loss: chosen dia ø = 3/4” Σξ = 2,0 (no dia. variations) ∆P7-6 = 18,0 . g. g. g. /m v = 0,47 m/s — Pressure loss: chosen dia. ø = 1” Σξ = 3,5 (dia. variations) ∆P6-5 = 12,0 . g. g. g. /m; v = 0,36 m/s — Pressure loss: chosen dia. ø = 1 1/4” Σξ = 3,5 (dia. variations) ∆P5-4 = 5,0 . g. g. g. /m v = 0,45 m/s — Pressure loss: ∆P4-3 = 7,5 . g. chosen dia. ø = 1 1/4” Σξ = 2,0 (no dia. g. g. /m v = 0,54 m/s — Pressure loss: chosen dia. ø = 1 1/4” Σξ = 2,0 (no dia. variations) ∆P3-2 = 11,0 .

G. and - round off this value to the nearest multiple of 100. g. 3. The dimensions of the other secondary circuits are calculated, on the basis of the required capacity, by determining: • the diameter and • pressure loss. The flow rate and pressure losses calculated in this way must then be balanced with the head determined in 2. 4. /m. 19 Note: If the secondary circuits and emitters are equal the flow rate of a particular circuit can be derived from that of the upper floor by means of the relative conversion factor given in TAB.

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