Inputs/Givens 1.Volume of Ice (3.5 gal) 2.Density of Ice (736 kg/m 3 ) 3.Latent Heat of Ice, h sf (333.6 KJ/kg) 4.Melt time of 1 hour (3600 s) Constraints.

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Presentation transcript:

Inputs/Givens 1.Volume of Ice (3.5 gal) 2.Density of Ice (736 kg/m 3 ) 3.Latent Heat of Ice, h sf (333.6 KJ/kg) 4.Melt time of 1 hour (3600 s) Constraints and Assumptions 1.Steady State 2.Ice can be melted in 1 hour Output 1. Cooling Load (900 watts) Governing Equations Efficiency Estimation Functional Diagram: Part 1 Cooling Load Required

Inputs/Givens 1.Heat Flux (900W) 2.Fluid properties of air and water Constraints and Assumptions 1.Ideal gas 2.Incompressible flow 3.Constant Pressure (Cp) 4.Uniform Flow 5.Steady State 6.Ambient air Temp of 22 C and output temp of 13 C 7.Coolant temp of 0 C from ice box 8.Ice can be melted in 1 hour Output 1. Air Flow Rate (0.12 m 3 /s) 2.Coolant Flow Rate (1 GPM -> at least 0.5) Governing Equations Efficiency Estimation Functional Diagram: Part 2 Fan/Pump sizing

Input data 1.Cooling Load (900 watts) 2.Coolant Flow rate (1 GPM -> at least 0.5) Constants and Knowns 1.Density of Water (1000 kg/m 3 ) Constraints and Assumptions 1.No pumping losses 2.65% pump efficiency (low) 3.Fan at 100% power 4.Steady State 5.2x calculated pump power to accommodate losses 6.  z (H) of coolant in pumping loop equal to 1m (would be less in actual unit) Output COP = 10 Governing Equations Efficiency Estimation Functional Diagram: Part 3 COP calculation

Measured data 1.  T of water in and out of radiator 2.W in from “plug power meter” 3.Coolant Flow Rate Constants and givens 1.Area, A, of air flow 2.Fluid properties of air (density, Cp) Constraints and Assumptions - Ideal gas - Incompressible flow - Constant Pressure (Cp) - Uniform Flow Output Final/Overall COP of unit Governing Equations Final Efficiency Functional Diagram (Final Testing)

Measured data 1.  T of water in and out of radiator 2.W in from “plug power meter” 3.Coolant Flow Rate Constants and givens 1.Area, A, of air flow 2.Fluid properties of air (density, Cp) Constraints and Assumptions - Ideal gas - Incompressible flow - Constant Pressure (Cp) - Uniform Flow Output Final/Overall COP of unit Governing Equations Final Efficiency Functional Diagram (Final Testing)