scholarly journals Techno-Economic Assessment of Waste Heat Recovery Technologies for the Food Processing Industry

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6446
Author(s):  
Sanjay Mukherjee ◽  
Abhishek Asthana ◽  
Martin Howarth ◽  
Jahedul Islam Chowdhury
Keyword(s):  
Low Temperature ◽  
Food Processing ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Fossil Fuels ◽  
Waste Heat ◽  
Economic Assessment ◽  
Hot Water ◽  
Food Manufacturing ◽  
Exhaust Gases

The food manufacturing sector is one of the most dominant consumers of energy across the globe. Food processing methods such as drying, baking, frying, malting, roasting, etc. rely heavily on the heat released from burning fossil fuels, mainly natural gas or propane. Less than half of this heat contributes to the actual processing of the product and the remaining is released to the surroundings as waste heat, primarily through exhaust gases at 150 to 250 °C. Recovering this waste heat can deliver significant fuel, cost and CO2 savings. However, selecting an appropriate sink for this waste heat is challenging due to the relatively low source temperature. This study investigates a novel application of gas-to-air low temperature waste heat recovery technology for a confectionary manufacturing process, through a range of experiments. The recovered heat is used to preheat a baking oven’s combustion air at inlet before it enters the fuel-air mixture. The investigated technology is compared with other waste heat recovery schemes involving Regenerative Organic Rankine Cycles (RORC), Vapour Absorption Refrigeration (VAR) and hot water production. The findings indicate that utilising an oven’s exhaust gases to preheat combustion air can deliver up to 33% fuel savings, provided a sufficiently large heat sink in the form of oven combustion air is available. Due to a lower investment cost, the technology also offers a payback period of only 1.57 years, which makes it financially attractive when compared to others. The studied waste heat recovery technologies can deliver a CO2 savings of 28–356 tonnes per year from a single manufacturing site. The modelling and comparison methodology, observations and outcomes of this study can be extended to a variety of low temperature food manufacturing processes.

scholarly journals Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

2021 ◽  
Vol 238 ◽  
pp. 10008
Author(s):  
Kirill Abrosimov ◽  
Federica Sciacchitano ◽  
Gianluca Pasini ◽  
Andrea Baccioli ◽  
Aldo Bischi ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Fossil Fuels ◽  
Waste Heat ◽  
Cooling System ◽  
Rapid Development ◽  
Economic Assessment ◽  
Design Parameters ◽  
Brayton Cycle

Aiming for the better environmental and economic performance of traditional engines, waste heat recovery (WHR) technologies are actively studied to find their most beneficial applications. In this work, the inverted Brayton cycle (IBC) is investigated as a potential WHR solution for liquefied natural gas (LNG) fuelled transport truck. LNG being one of the less polluting fossil fuels is widely spreading nowadays in different industries due to the rapid development of the LNG supply chain in the world. LNG-fuelled cargo transportation follows this prevailing trend. Based on the overexpansion of flue gases to subatmospheric pressure, inverted Brayton cycle, in turn, is considered a prospective technology of WHR and techno-economic analysis of IBC in several configurations on-board of a heavy transport truck have been assessed. IBC is integrated into the engine cooling system in the basic layout, and additionally, it incorporates LNG regasification process in advanced configurations. Power balance based on Aspen Hysys model enables to perform system optimisation and gives preliminary design parameters of the system components. Cost function approach provides the basis for a preliminary economic assessment of the layouts. Although the system shows fuel economy of maximum about 2.1 %, analysis revealed the necessity to continue the search for better technical solutions in IBC-based systems to make them economically attractive due to high cost of installed equipment.

scholarly journals Experimentation of a Diesel Engine with Waste Heat Recovery Heat Exchanger

2019 ◽  
Vol 9 (2) ◽  
pp. 949-952
Keyword(s):  
Heat Exchanger ◽  
Diesel Engine ◽  
Rural Areas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Fossil Fuels ◽  
Waste Heat ◽  
Total Heat ◽  
Exhaust Gases ◽  
The Cost

In Rural Areas The Diesel Engine Generator Set Which Uses Diesel Engine Is Used For Irrigation And Agricultural Purposes. But Today The Cost Of Diesel Is Drastically Increasing And The Fossil Fuels Are Continuously Depleting. Also The Exhaust Gases Carry Away Around 35% Of The Total Heat Supplied To The Engine. Consequently Attempts Are Taken To Elevate The Propellant Economy And To Escalate The Productivity Of The Engine By Enhancing The Pursuance And Exudation Distinctive Of The Diesel Engine. Hence A Waste Heat Recovery Exchanger Was Modeled And Synthesized To Utilize The Heat From Exhaust Gases To Preheat The Incoming Air Before Supplying It Into The Cylinder Of The Engine. Initially The Pursuance And Exudation Distinctive Of The Diesel Engine Were Carried Out Without The Heat Exchanger. Then The Same Experiments Were Carried Out With The Heat Exchanger And The Results Reveals That There Is An Improvement In The Performance And Reduction In Emissions Of The Diesel Engine.

scholarly journals Design of a Database of Case Studies and Technologies to Increase the Diffusion of Low-Temperature Waste Heat Recovery in the Industrial Sector

2021 ◽  
Vol 13 (9) ◽  
pp. 5223
Author(s):  
Miriam Benedetti ◽  
Daniele Dadi ◽  
Lorena Giordano ◽  
Vito Introna ◽  
Pasquale Eduardo Lapenna ◽  
...  
Keyword(s):  
Low Temperature ◽  
Case Studies ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Industrial Sector ◽  
Implementation Rate ◽  
Depth Analysis ◽  
Technology Market

The recovery of waste heat is a fundamental means of achieving the ambitious medium- and long-term targets set by European and international directives. Despite the large availability of waste heat, especially at low temperatures (<250 °C), the implementation rate of heat recovery interventions is still low, mainly due to non-technical barriers. To overcome this limitation, this work aims to develop two distinct databases containing waste heat recovery case studies and technologies as a novel tool to enhance knowledge transfer in the industrial sector. Through an in-depth analysis of the scientific literature, the two databases’ structures were developed, defining fields and information to collect, and then a preliminary population was performed. Both databases were validated by interacting with companies which operate in the heat recovery technology market and which are possible users of the tools. Those proposed are the first example in the literature of databases completely focused on low-temperature waste heat recovery in the industrial sector and able to provide detailed information on heat exchange and the technologies used. The tools proposed are two key elements in supporting companies in all the phases of a heat recovery intervention: from identifying waste heat to choosing the best technology to be adopted.

scholarly journals Evaluation of low-temperature waste heat recovery technologies for the cement industry

2015 ◽  
Author(s):  
L. Lopera ◽  
C. Nieto ◽  
A. C. Escudero ◽  
C. A. Bustamante ◽  
M. C. Fernández
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Cement Industry
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