The discussion focuses on the pressure dynamics in a closed central heating system when a pump is activated. Initially, the static pressure is 2.0 bars, with a system head loss of 0.6 bars. When the pump starts, the suction side pressure remains constant at 2.0 bars if the expansion vessel is connected near the pump suction, while the discharge pressure increases to 2.6 bars. The positioning of the expansion vessel significantly influences the pressure readings on both the suction and discharge sides.
PREREQUISITESHeating system engineers, HVAC technicians, and anyone involved in the design or maintenance of central heating systems will benefit from this discussion.
Depends if the resistance to flow is upstream or downstream of the atmospheric pressure refill - or what fraction is upstream versus downstream.TSN79 said:Consider a closed system (central heating). Before the pump is started the static pressure is 2.0 bars. Say the system head loss is 0.6 bars. When the pump starts, will the suction side pressure and the discharge pressure each read half the total head loss (1.7 and 2.3 bars)? Or will the head loss be split unequally for some reason?