Elektro Kalori Ürün Kataloğu

www.elektrokalori.com.tr 2 26 Valve sizing and actuator selection Basic hydronic circuit 1 Determine the type of hydronic circuit Throttling circuit Injection circuit with 2-port valve Diverting circuit Injection circuit with 3-port valve Mixing circuit Mixing circuit with – For valve sizing relevant variable Primary pump ü Primary pump  Primary pump ü Primary pump  HVAC plants and consumers Heating – n – outdated – – n n Heating plant (primary) – n n outdated n n n n Zone control, heating – n – outdated – – – – Heating groups – n – – n n n n Generation of heat energy – – – – – n – n Heat exchanger water-water n uncommon uncommon uncommon uncommon – – – Ventilation and air conditioning plants Air handling unit (AHU) n n n outdated n n – – Fan coil unit n – n outdated – – – – Cooling coil dehumidifying – dehumidifying uncommon – – – – Reheating coil n n outdated outdated uncommon uncommon uncommon uncommon Preheating coil – n – outdated uncommon uncommon uncommon uncommon VAV n – n outdated – – – – Zone control n – n outdated – – – – Chiller plants – n – outdated – – – – Generation of cooling energy – – – – – n – n Cooling towers n – n uncommon – – – – Zone control, cooling – n – outdated – – – – District heating and cooling District heating, primary n uncommon – – – uncommon – uncommon District heating, secondary n n – – – uncommon – uncommon District cooling, primary n uncommon – – – uncommon – uncommon District cooling, secondary n n – – – uncommon – uncommon Domestic hot water (DHW) DHW – n – – – n – – Header Differential pressure header pressurized pressureless variable constant variable Determination of k vs value 2 Δp VR or Δp MV Δp VR Δp MV typical range 10…200 kPa 10…200 kPa 10…50 kPa 2…5 kPa 2…5 kPa 5…15 kPa 2…5 kPa 5…15 kPa typical value Use effective Δp VR value 35 kPa 3 kPa 3 kPa 8 kPa 3 kPa 8 kPa 3 Determine Δp V100 ∆p V100 ≥ ∆p VR 2 Δp V100 ≥ Δp MV 4 Calculate V 100 Water without anti-freeze Q 100 1.163·∆T V 100 = Water with anti-freeze Q 100 · 3600 c· ρ ·∆T V 100 = 5 Determine k vs value ∆p V100 100 k V = => k VS ≥ 0.85 k V value V 100 6 Check resulting Δp V100 ∆p V100 = 100 · ( ) 2 k VS V 100