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Inputs/Givens Volume of Ice (3.5 gal) Density of Ice (736 kg/m 3 )

Efficiency Estimation Functional Diagram: Part 1 Cooling Load Required. Inputs/Givens Volume of Ice (3.5 gal) Density of Ice (736 kg/m 3 ) Latent Heat of Ice, h sf (333.6 KJ/kg) Melt time of 1 hour (3600 s). Constraints and Assumptions Steady State

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Inputs/Givens Volume of Ice (3.5 gal) Density of Ice (736 kg/m 3 )

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  1. Efficiency Estimation Functional Diagram: Part 1 Cooling Load Required Inputs/Givens Volume of Ice (3.5 gal) Density of Ice (736 kg/m3) Latent Heat of Ice, hsf (333.6 KJ/kg) Melt time of 1 hour (3600 s) Constraints and Assumptions Steady State Ice can be melted in 1 hour Governing Equations Output Cooling Load (900 watts)

  2. Efficiency Estimation Functional Diagram: Part 2 Fan/Pump sizing Constraints and Assumptions Ideal gas Incompressible flow Constant Pressure (Cp) Uniform Flow Steady State Ambient air Temp of 22 C and output temp of 13 C Coolant temp of 0 C from ice box Ice can be melted in 1 hour Inputs/Givens Heat Flux (900W) Fluid properties of air and water Governing Equations Output Air Flow Rate (0.12 m3/s) Coolant Flow Rate (1 GPM -> at least 0.5)

  3. Efficiency Estimation Functional Diagram: Part 3 COP calculation Input data Cooling Load (900 watts) Coolant Flow rate (1 GPM -> at least 0.5) Governing Equations Output COP = 10 Constants and Knowns Density of Water (1000 kg/m3) Constraints and Assumptions No pumping losses 65% pump efficiency (low) Fan at 100%power Steady State 2x calculated pump power to accommodate losses z (H) of coolant in pumping loop equal to 1m (would be less in actual unit)

  4. Final Efficiency Functional Diagram (Final Testing) Measured data Tof water in and out of radiator Win from “plug power meter” Coolant Flow Rate Governing Equations Output Final/Overall COP of unit Constants and givens Area, A, of air flow Fluid properties of air (density, Cp) • Constraints and Assumptions- Ideal gas • Incompressible flow • Constant Pressure (Cp) • Uniform Flow

  5. Final Efficiency Functional Diagram (Final Testing) Measured data Tof water in and out of radiator Win from “plug power meter” Coolant Flow Rate Governing Equations Output Final/Overall COP of unit Constants and givens Area, A, of air flow Fluid properties of air (density, Cp) • Constraints and Assumptions- Ideal gas • Incompressible flow • Constant Pressure (Cp) • Uniform Flow

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