Volume Control in fluid distribution systems UBCLQT-40-3 Building & Engineering Systems Performance
References C. Parsloe (2008), Variable flow pipework systems, CIBSE KS07 Arnold Teekaram & Anu Palmer (2002), Variable-flow water systems - Design, installation and commissioning, BSRIA AG16/02 BRECSU (1996), GIR41: Variable flow control, Carbon Trust BSRIA (1991), Commissioning VAV systems in buildings, BSRIA AG1/91 C J Parsloe, (1999) Variable speed pumping in heating an cooling circuits, BSRIA AG14/99
Pumps: fixed speed performance
Control of pumps – 20% reduction in flow
Control of pumps The pump laws
Control of flow: variable flow circuits The best energy-saving options are: vary pump speed based on the pump differential pressure and using an integral speed control characteristic designated by the pump manufacturer vary pump speed to maintain pressure constant at system extremities (using remote differential pressure sensors).
Option 1: integral pump speed controller
Option 2: constant pressure control using DPR
Flow measurement & regulation Fixed orifice FMD Variable orifice FMD Fixed orifice FMD + DRV
Constant flow regulator Variable flow controller
Differential pressure control valve (DPCV)
Combination valve
Return temperatures
Constant head pump
VSD pump to maintain constant head
VSD pump with differential pressure
Bodle-Orchard circuit for variable volume heating system
Bodle-Orchard circuit for primary/secondary variable volume heating system
Fan control Damper Inlet vane Eddy current coupling Variable pitch axial Multi-speed motor Inverter (PWM) Switched reluctance drive Variable voltage
VAV systems
VAV system commissioning
VAV system: Basic design information