HomeMy WebLinkAboutPerusich SBCC Utilities Committee FILEDOPEN LOOP VS CLOSED LOOP SYSTEMS Karl Perusich, Ph.D. Filed in Clerk's Office AUG 2 0 2026 Bianca Tirado City Clerk, South Bend, IN
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OPEN LOOP VS. CLOSED LOOP • Open Loop • Input resources are used only once • Become part of product • Become scrap • Closed Loop • Some or all of a resource is re-used • Full or partial closed loop • Reuse does not have to be 100% • If at least one resource (input) is reused at least partially you have a closed loop system for that resource
EXAMPLE: BACK YARD SWIMMING POOL
EXAMPLE: OIL SYSTEM IN AUTOMOBILE Engine Oiling System Variable Valve Timing Cam Phasers Oil Pump Oil Pan-~ Variable Valve Timing Cam Phasers Main Gallery Oil Jets for Piston Cooling II', Oil Pressure Switch AA'1Car.com
SYSTEMS GOAL • Generally desire closed loop systems • Resources (inputs) are reused • Reduces overall expenses • Can simplify design of system initially
Nuclear Reactor (Boiler) @) I I @--■-------. G) I ■ ® Primary Loop .. Secondary Loop CJ Third Loop Generator Non-Radioactive Cool Water Return Non-Radioactive Water Vapor Cooling Tower t t t Warm Moist Air t t t
DATA CENTER • Inputs • Electricity • Data • Water • Outputs • Data Electricity :1 Data I : ~:: Data --.... _._ Center 1---: ____ : Water Water--L _______ _ • Heat (water, air) • Possible reuse-water
DATA CENTER OPEN LOOP Electricity :1 Data I : ~:~ Data --~-Center •--~: Water Water --L_ _______ _
DATA CENTER PARTIAL CLOSED LOOP Electricity Data Water ~~ ~ ~ ~ -~ -... Data Center '' -~ -r -~ Data Heat Water
DATA CENTER CLOSED LOOP Electricity---Data ---.i Data Center I-----Data 1-----Heat 1-----,--Water
----------····-·-·-----•--· --. ---------------OPEN LOOP COOLING DATA CENTER COOLING: OPEN LOOP VS. CLOSED LOOP OPEN LOOP {The "Swamp Cooler") )( .. ,., . . _. '-C ~ MILLIONS of LOCAL WATER gallons consumed SOURCE daily High Water Waste, Lower Electric Use CLOSED LOOP (The "Car Radiator·) ~ ~MINIMAL ~ water usage O<♦ (Fans do the cooling) HEAT REJECTED TO AIR (No Water Evaporation) Zero Water Waste, Higher Electric Use