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Slide 1UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE UCSB 4-Hybrid Thermal Test System Status Peltier Cooling Loop 20 September 2004.

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Presentation on theme: "Slide 1UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE UCSB 4-Hybrid Thermal Test System Status Peltier Cooling Loop 20 September 2004."— Presentation transcript:

1 Slide 1UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE UCSB 4-Hybrid Thermal Test System Status Peltier Cooling Loop 20 September 2004

2 Slide 2UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE The Cooling Loop Cooling Loop is a Series Circuit à Source: Chiller à Load: Peltier Element à Path Resistances: –Flow Sensor –Valve –Flow Gauge Think of this Loop as a SERIES ELETRICAL CIRCUIT

3 Slide 3UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Electrical Analog Current = Voltage / Resistance (Ohms Law) à I=E/R Flow = Pressure / Resistance (Analogy) à F=P/R

4 Slide 4UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Flow Units F=P/R FLOW = Units of Liters/min à L/m PRESSURE = Units of Pounds/ in^2 à PSI Resistance = Units of (PSI/L/m)

5 Slide 5UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Kirchhoff’s Law  P = 0 0 = +8 -F*Rc- F*Rs -F*Rv-F*Rf-F*Rp 8 = F(Rc+Rs+Rv+Rf+Rp) F = 8 /  R

6 Slide 6UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Flow Calculation F=P/R Flow=8psi/(Rc+Rs+Rv+Rf+Rp) à 8 psi is Chiller Static Pressure (0 flow) à Rc=Chiller Source Resistance (8psi/14L/m=1.1) à Rs=Sensor Resistance (6psi/2L/m=3.0) à Rv=Valve Resistance Cv=1.1g/m@1psi or 0.24psi/L/m à Rf=Flow Sensor Resistance Unknown assume 1.0 à Rp=Peltier Resistance, Low assume 0.1

7 Slide 7UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Calculate Current Flow F=P/R F=P/(Rc+Rs+Rv+Rf+Rp) F=8/(0.6+3.0+1.1+1.0+0.1)=8/5.8 à F=1.37 L/m à Measured 1.2 L/m with Flow Gauge set for max

8 Slide 8UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Current Chiller Loop

9 Slide 9UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Loop with new Sensor

10 Slide 10UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE New Sensor and Valve

11 Slide 11UCSB CMS Weekly Status MeetingCMS 4-Hybrid Test System Sam Burke EE Summary Adding Redundant Hardware Interlock à 80 deg Peltier thermostat in place à >1.0 L/m Flow Interlock currently being implemented Increase Cooling Loop Flow using new Sensor à Flow to increase 93% à Approaching 68% of SuperCool recommendation

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