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Energies 2020, 13, 6446 22 of 26 Energies 2020, 13, x FOR PEER REVIEW 22 of 26 indicate higher energy savings for ORC compared to VAR. This is because a single VAR system can fulfil two purposes, i.e., produce cooling and recover waste heat. On the other hand, an ORC system system can fulfil two purposes, i.e., produce cooling and recover waste heat. On the other hand, an will only recover waste and a separate VCR system will still be required to produce cooling. This may ORC system will only recover waste and a separate VCR system will still be required to produce increase the capital investment and require more installation space. cooling. This may increase the capital investment and require more installation space. Start Has the oven been optimised? No No Optimiseoven for operational excellence Measure exhaust temperature, Yes Yes No No No Calculate Proceed with heat recovery Yes Yes Yes Yes waste flow& moisture heat Return on Investment suitable? No Return on Investment suitable? No Return on Investment suitable? No Return on Investment suitable? No Heat recovery not vi abl e. End project. Designheat recovery for combustion air preheating Designheat recovery for producinghot water aloneorcombinedwith combustionair preheating Designheat recovery systemwith absorptioncoolingtechnology Designheat recovery systemwith Organic RankineCycle to produce electricity Yes Yes Yes FFigiguurere1122. .Prrocess map for the selectiionoffssuititaabblelehheeaat trerceocovvereyrytetcehcnhonlolgoyg.y. 4. Conclusions 4. Conclusions Worldwide, the food manufacturing sector is an energy-intensive sector using fossil fuels which Worldwide, the food manufacturing sector is an energy-intensive sector using fossil fuels which isiesxepxepcetcetdedtotogrgorowwininlilnineewwitihthppoopullattiiongrowth.Moorreeththaannhhalaflfooffththeehehaetatsuspuplpieldiedtotofoofodod mmanaunfuafcatcuturirninggpprorocceessseess,,ssuchasbaking,drying,,ffryiingg,,rrooaasstitningg,,hheaetaintign,ge,tec.tci.sisvevnetnedtedtotothethe susrurroruonudnidninggs,s,wwitihthththeeeexxhhaaustt gases as waste heat,, wiitthouttccoonntrtirbibuutitninggtotothteheprporcoecsessinsignogfotfhethe prpordoudcutc.tT.TheheUUKKfofooddaanndddrriinkmanufacturingsectoremiittssccirirccaa22.8.8TTWhhoforferceocvoevrearbalbelwewasatestheehaetat into the environment annually. This represents a significant opportunity for waste heat recovery. into the environment annually. This represents a significant opportunity for waste heat recovery. This study investigated the performance of a novel low-grade gas-to-gas waste heat recovery This study investigated the performance of a novel low-grade gas-to-gas waste heat recovery technology, to preheat combustion air, applied to wafer baking ovens. It also compared the newly technology, to preheat combustion air, applied to wafer baking ovens. It also compared the newly developed technology with other existing technologies, such as waste heat to hot water, organic developed technology with other existing technologies, such as waste heat to hot water, organic Rankine Rankine cycle and vapour absorption refrigeration, based on technical feasibility and energy savings. cycle and vapour absorption refrigeration, based on technical feasibility and energy savings. The work The work presents a systematic methodology for developing and comparing low grade waste heat presents a systematic methodology for developing and comparing low grade waste heat recovery recovery models for the food manufacturing sector. It also highlighted the key parameters that should models for the food manufacturing sector. It also highlighted the key parameters that should be used be used to evaluate the performance of manufacturing processes with integrated heat recovery to evaluate the performance of manufacturing processes with integrated heat recovery systems. systems. The findings revealed that the energy efficiencies of existing wafer baking processes and equipment used in industry can be improved by ~33% by integrating them with a waste heat recovery Data availableonoven’s wasteheat generation? S u f f i c i e n t n u mb e r o f o v e n s t o p r o v i d e h e a t s i n k inthe formof combustionair? Look forhistoricalhotwater demanddata. Hot water demand exists ? Look forhistoricalcoolingdemanddata. Coolingdemand exists ?PDF Image | Waste Heat Recovery Technologies for the Food Processing Industry
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