Objectives Finish with pumps and plumbing example Learn

Objectives - Finish with pumps and plumbing example - Learn about district cooling and heating systems

System Curves ∆p A+B B A+B A B V A B Parallel V A B Serial

System balancing AHU 1 AHU 2 HC 1 HC 2 100 ft 10 gpm 2 gpm 10 ft pump BOILER

Pumps • Raise pressure and produce flow • Main type • Centrifugal Example of Turbine pump Reading (textbook) Page 3 -36 - 3 -45 http: //www. taylorengineering. com/downloads/cooltools/EDR_De sign. Guidelines_Cool. Tools. Chilled. Water. pdf Inline Base mounted

Curve for Multiple Pumps

Changing Pump Speed

HW 5: Find a system curve for this plumbing configuration

Primary/Secondary and Tertiary Pumping Reading Assignment: Taylor, S. , P. Dupont, B. Jones, T. Hartman and M. Hydeman. 2000. Chilled water plant design guide. San Francisco: Pacific Gas & Electric Company. http: //www. taylorengineering. com/downloads/cooltools/EDR_Design. Guidelines_C ool. Tools. Chilled. Water. pdf

Hydronic systems for district cooling/heating and buildings Constant-Flow System, Single Chiller, Single Coil Mixing valve that control by-pass flow Major pumping force is the chiller pump Constant-Flow System, Single Chiller, Multiple Coils

Control of coil temperature Mixing valve that control the flow through the coil Flow Variation as a Function of Valve Position Same pressure drop like a cooling coil Major pumping force is the chiller pump

Multiple chiller (or boilers) Parallel Serial

Primary-Loop Only Variable Speed Flow Single chiller Multiple chillers

Primary and Secondary Loop Variable Flow Design Parallel chillers Serial chillers

Large Plant or Building Distribution Systems Primary/Secondary Loops with Variable Flow and Distributed Pumping

Primary/Secondary and Tertiary Pumping

Primary Pump Arrangements Dedicate a pump for each chiller Provide a common header for the pumps

Coil Pumping Strategies Variable speed pumps vs. Single pas Valve vs. Mixing valves vs. Diverting Valves

Impact of plumbing on a cooling coil

Plumbing Arrangement in Building’s hydronic systems Radiators Baseboard heaters Fan coil systems

Valves • Section 5 -14 and 6 -15 in the textbook • Types • Butterfly Valves • Ball Valves • Globe Valves Three way valves

Valve Sizing and Flow Coefficient Cv value: in liter/hour or…. in Pa Control Valve Selection For Hydronic Systems reference: http: //www. google. com/url? sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact =8&ved=0 CCUQFj. AA&url=http%3 A%2 F%2 Fbookstore. ashrae. biz%2 Fjournal%2 Fdo wnload. php%3 Ffile%3 Dhegberg. pdf&ei=Ivcq. U_O 1 KMu. E 2 AWglo. Hg. DA&usg=AFQj. CN FRAMz. Pnbz. Dp. Aluhyk 4 l 8 u_SKKTdw

Control Valve Selection For Hydronic Systems Before DC we tried to do this Valve authority