Presentation Title

Thermodynamic Analysis & Simulation of a Compost Waste Heat Fed R245fa Organic Rankine Cycle

Start Date

November 2016

End Date

November 2016

Location

MSE 103

Type of Presentation

Oral Talk

Abstract

Many technological breakthroughs are being advanced in order to address the world’s need for sustainable, alternative and renewable energy resources. This paper will present a solution for sustainable power generation using a compost “waste heat” powered R245fa organic Rankine cycle engine. The compost waste heat is the heat naturally liberated from the process of organic composting of waste such as vegetable remnants, fruit scrapings, piles of leaves, etc. The heat that emanates from the biological decomposition of this composting process which would otherwise be expelled into the local atmosphere is harnessed as “waste-heat” which is used to power an engine based on the thermodynamic Rankine engine using an organic refrigerant known as R245fa. This power cycle is commonly referred to as the Organic Rankine Cycle (ORC). The R245fa refrigerant is an environmentally friendly heat transfer working fluid, having a low CO2 footprint. Characterization of the R245fa working fluid as it applies to the current problem will be outlined. The paper will present the thermal analysis and numerical simulation of a compost waste heat fed ORC. The development of the thermodynamic/heat transfer based MATLAB model and the utilization of the the CoolProp thermo-physical property library used for the simulation is also presented. Results for parametric trades studies of the compost waste heat fed ORC efficiency as a function of evaporator to condenser heat exchanger pressure ratio and R245fa mass flow rate will be presented. These results show that thermal to kinetic energy conversion efficiencies (compost waste heat to power output of the engine) on the order of 20% may be reached. While this may not seem profound, it should be noted that this is all done with waste heat, which normally would be otherwise be lost. A thermo-economic analysis showing the equivalent $/kW-hr rating of the compost ORC is also presented.

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Nov 12th, 3:30 PM Nov 12th, 3:45 PM

Thermodynamic Analysis & Simulation of a Compost Waste Heat Fed R245fa Organic Rankine Cycle

MSE 103

Many technological breakthroughs are being advanced in order to address the world’s need for sustainable, alternative and renewable energy resources. This paper will present a solution for sustainable power generation using a compost “waste heat” powered R245fa organic Rankine cycle engine. The compost waste heat is the heat naturally liberated from the process of organic composting of waste such as vegetable remnants, fruit scrapings, piles of leaves, etc. The heat that emanates from the biological decomposition of this composting process which would otherwise be expelled into the local atmosphere is harnessed as “waste-heat” which is used to power an engine based on the thermodynamic Rankine engine using an organic refrigerant known as R245fa. This power cycle is commonly referred to as the Organic Rankine Cycle (ORC). The R245fa refrigerant is an environmentally friendly heat transfer working fluid, having a low CO2 footprint. Characterization of the R245fa working fluid as it applies to the current problem will be outlined. The paper will present the thermal analysis and numerical simulation of a compost waste heat fed ORC. The development of the thermodynamic/heat transfer based MATLAB model and the utilization of the the CoolProp thermo-physical property library used for the simulation is also presented. Results for parametric trades studies of the compost waste heat fed ORC efficiency as a function of evaporator to condenser heat exchanger pressure ratio and R245fa mass flow rate will be presented. These results show that thermal to kinetic energy conversion efficiencies (compost waste heat to power output of the engine) on the order of 20% may be reached. While this may not seem profound, it should be noted that this is all done with waste heat, which normally would be otherwise be lost. A thermo-economic analysis showing the equivalent $/kW-hr rating of the compost ORC is also presented.