RHOSS TCAEY 118 Gebrauchsanweisung Seite 125

A3 PRESSURE DROPS
Graph "1": pressure drops, exchangers for Models 118÷135
Graph "1": pressure drops, exchangers for Models 140÷270
Calculation of pressure drops
○ The water flow rate at the exchanger is calculated according to the following formula: G = (Q x 860) : ΔT.
• Where:
G (l/h) = water flow rate at the exchanger;
Q (kW) = exchanged power, which may be QF (for the evaporator) or QT (for the condenser), depending on the exchanger in question;
ΔT (°C) = temperature differential;
○ The pressure drops can be read on the graph to the side, or can be calculated using the following rough formula:
N.B.:
For all machines, refer in any case to admissible operating limits and thermal differences (ΔT).
Δpw (kPa) = nominal pressure drop at the exchanger in question
(table on Technical data);
G (l/h) = water flow rate at the exchanger in question;
Δpw (kPa) = nominal pressure drop at the exchanger in question
(table on Technical data);
G (l/h) = water flow rate at the exchanger in question;
Δpw = Δpw x (G : G )²
nom nom
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