UCSB 4-Hybrid Thermal Test System Status

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UCSB 4-Hybrid Thermal Test System Status
Peltier Cooling Loop 20 September 2004
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The Cooling Loop

• Cooling Loop is a Series Circuit
• Source Chiller
• Load Peltier Element
• Path Resistances
• Flow Sensor
• Valve
• Flow Gauge
• Think of this Loop as a SERIES ELETRICAL CIRCUIT

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Electrical Analog

• Current Voltage / Resistance (Ohms Law)
• IE/R
• Flow Pressure / Resistance (Analogy)
• FP/R

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Flow Units

• FP/R
• FLOW Units of Liters/min
• L/m
• PRESSURE Units of Pounds/ in2
• PSI
• Resistance Units of (PSI/L/m)

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Kirchhoffs Law

• ? P 0
• 0 8 -FRc- FRs -FRv-FRf-FRp
• 8 F(RcRsRvRfRp)
• F 8 / ? R

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Flow Calculation

• FP/R
• Flow8psi/(RcRsRvRfRp)
• 8 psi is Chiller Static Pressure (0 flow)
• RcChiller Source Resistance (8psi/14L/m1.1)
• RsSensor Resistance (6psi/2L/m3.0)
• RvValve Resistance Cv1.1g/m_at_1psi or
  0.24psi/L/m
• RfFlow Sensor Resistance Unknown assume 1.0
• RpPeltier Resistance, Low assume 0.1

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Calculate Current Flow

• FP/R
• FP/(RcRsRvRfRp)
• F8/(0.63.01.11.00.1)8/5.8
• F1.37 L/m
• Measured 1.2 L/m with Flow Gauge set
  for max

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Current Chiller Loop
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Loop with new Sensor
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New Sensor and Valve
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Summary

• Adding Redundant Hardware Interlock
• 80 deg Peltier thermostat in place
• gt1.0 L/m Flow Interlock currently being
  implemented
• Increase Cooling Loop Flow using new Sensor
• Flow to increase 93
• Approaching 68 of SuperCool recommendation