Cameron Miranda
Energy is an important input in the production, processing, packaging, distribution, storage, preparation, and disposal of food. The food sector accounts for around 30% of global primary energy consumption. In food processing, the law of conservation of energy can be applied, where energy is neither created nor destroyed. First-law and second-law efficiencies are used to determine the energy efficiency of food processing plants. For example, in an industrial bakery, half of the energy consumed is in the oven, and methodologies have been developed to estimate the first and second-law efficiencies for each stage of the baking process.
| Characteristics | Values |
|---|---|
| Law of energy that can be applied to food processing | Energy is not created or destroyed |
| First-law efficiency in a condensed milk plant | 59.6% |
| Second-law efficiency in a condensed milk plant | 19.4% |
| First-law efficiency in a bakery plant | 43.0% |
| Second-law efficiency in a bakery plant | 15.5% |
| First-law efficiency in billet steel manufacture from scrap iron | 84.7% |
| Second-law efficiency in billet steel manufacture from scrap iron | 58.6% |
| Modified first-law efficiency in billet steel manufacture from scrap iron | 54.9% |
| Modified second-law efficiency in billet steel manufacture from scrap iron | 36.3% |
| Energy transfer efficiency from primary to secondary consumers | 10% |
| Energy transfer efficiency from primary to tertiary consumers | 5% |
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What You'll Learn
Food processing plants can achieve energy efficiency improvements
Another way to improve energy efficiency is to optimise the layout of the facility to match the production steps. This can streamline operations and reduce energy waste. Specific processes within the plant can also be improved, such as by modifying the dough moulds in a bakery plant to reduce their mass, or by recovering energy from the bake-oven exhaust to heat a proofing oven. In some cases, replacing certain processes can lead to significant improvements, like swapping flash-cooling with a combination of boiling and vapour-compression refrigeration, which can enhance plant efficiencies.
Furthermore, implementing a Slot Drain System can enhance safety, sanitation, and efficiency in food processing plants. This system is designed to handle a range of applications, from heavy-duty industrial use to aesthetically focused landscaping. It is customisable and includes a specialised cleaning kit. By adopting such systems, plants can improve their overall efficiency and reduce downtime caused by maintenance issues.
Computational fluid dynamics (CFD) optimisation studies can also be employed to optimise operating conditions, resulting in reduced energy usage and processing times. For instance, in the context of bread baking, a CFD study indicated that bake time could be reduced by up to 10%, and the specific energy required to bake each loaf could be lowered by approximately 2%. This translates to considerable cost and carbon reduction on an industrial scale.
By adopting these strategies and technologies, food processing plants can improve their energy efficiency, reduce costs and environmental impact, and enhance their overall success in the market.
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Fossil fuels are used at all stages of the food system
The production of inputs, such as fertilisers, pesticides, animal feed, and farm machinery, accounts for around 5% of fossil fuel use in the food system. The most common fertiliser, synthetic nitrogen, is produced through an energy-intensive process that involves high temperatures and pressures, resulting in significant carbon dioxide emissions.
Processing and packaging, including warehousing, plastic production, transport, refrigeration, and processing of ultra-processed foods, make up around 42% of fossil fuel use in the food system. This stage is particularly energy-intensive due to its reliance on refrigeration systems, transportation, and packaging manufacturing. As the food system becomes more globalised, the distance that food travels increases, requiring improved packaging and stricter processing, all of which contribute to higher fossil fuel consumption.
Retail, consumption, and waste account for approximately 38% of fossil fuel use in the food system. This includes food waste, cooking energy, transportation, and embedded plastics. High-income countries tend to have higher energy intensity in retail due to the widespread use of refrigerated containers and factory-processed foods.
Overall, the food system's dependence on fossil fuels is deeply intertwined with climate change. To prevent catastrophic global warming and ecological overshoot, it is crucial to reduce and eventually phase out fossil fuel use in the food system by 2050. This transition involves adopting renewable energy sources, electrifying transportation, and transforming the way we produce and consume food.
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Energy is required for food processing, packaging, and distribution
Food systems around the world account for about 30% of the world's total energy consumption. The food industry is heavily dependent on fossil fuels, which contribute significantly to global greenhouse gas emissions. As such, it is important to make the food system more energy-efficient.
Food processing, packaging, and distribution all require energy. Food processing refers to the transformation of raw ingredients into food products, such as turning raw corn into cereal. This process can be energy-intensive, especially for certain food products like instant coffee, milk powder, French fries, crisps, and bread. The thermal processes involved in manufacturing these products consume large amounts of energy. For example, half of the energy consumed in an industrial bakery is used in the oven.
To improve energy efficiency in food processing, methodologies have been developed to estimate first and second-law efficiencies for each stage of the process. By implementing these methodologies, it is possible to reduce bake time and the specific energy required to bake each loaf, resulting in significant cost and carbon emission reductions.
In the meat and dairy processing sectors, energy and water use have increased due to higher hygienic standards and cleaning requirements. Meat products are often over-processed for consumer convenience, further increasing energy usage.
Food handling, which includes packaging, accounts for nearly 50% of the energy used in food production. This sector's total energy consumption is equivalent to the energy needed to power Taiwan for a year. To reduce energy consumption in this sector, individuals can take steps such as buying only as much food as they need, purchasing locally sourced food, and investing in energy-efficient food storage.
Distribution is another area where energy is required in the food supply chain. In the UK, most food is transported by road, and the distances travelled have increased in recent years. Refrigerated transportation, which is more energy-intensive than stationary refrigerated systems, has also become more common.
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Energy is lost at each trophic level in the food chain
The law of energy that can be applied to food processing is the law of energy conservation, also known as the first law of thermodynamics. This law states that energy cannot be created or destroyed, only transferred or transformed. This is exemplified in food processing, where energy is converted from one form to another, such as chemical energy in food being converted into heat energy during cooking processes.
Now, considering the statement "Energy is lost at each trophic level in the food chain", it is important to understand the concept of trophic levels and the flow of energy within them. Trophic levels represent the different positions that organisms occupy within a food chain, with each level corresponding to a specific role in the transfer of energy. The energy flow through these trophic levels can be visualised using an energy pyramid, where the primary producers are at the bottom and the tertiary consumers are at the top.
At each trophic level, energy is indeed lost due to various factors. This loss of energy can be attributed to the inefficiencies in energy transfer between organisms. On average, only about 10% of the energy available at one trophic level is passed on to the next, a concept known as the 10% rule. This rule highlights the energy limitations within an ecosystem, restricting the number of trophic levels it can sustain.
There are several reasons why energy is not fully transferred between trophic levels. Firstly, organisms at each level require energy for their own growth, respiration, and maintenance, leaving only a portion of the energy to be passed on. Additionally, not all parts of an organism are consumed, such as bones and plant roots, resulting in the loss of energy stored in those tissues. Furthermore, consumers are unable to fully digest all the food they ingest, and some energy is lost as waste or through processes like cellular respiration.
The energy lost at each trophic level has significant implications for the structure and dynamics of food chains. As energy decreases with each level, there is a corresponding decrease in biomass, or the amount of living matter at that level. This leads to a pyramidal structure, with lower trophic levels having higher biomass and energy availability. Consequently, food chains rarely exceed four or five trophic levels due to the limited energy available to higher-level consumers, making it challenging for predators to obtain sufficient energy to survive.
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Oven bake time and energy usage can be reduced
One way to reduce energy usage is to maximise the oven's capacity by cooking more than one dish at a time. This is an effective way to make use of the heat generated by the oven. For example, if you are baking a pizza, you could use the lower racks to toast nuts or roast vegetables. Planning your bakes to make efficient use of the oven space can help to reduce the overall energy required.
Another way to reduce energy usage is to keep the oven door closed. Each time the oven door is opened, hot air escapes, causing a drop in temperature of around 25°F. The oven then has to use more energy to raise the temperature back to the required level. Therefore, it is advisable to avoid opening the oven door to check on your bake unless necessary.
Additionally, you can lower the preheating temperature of your oven by 25°F. Many recipes can be cooked successfully at slightly lower temperatures, and this will help to reduce energy usage. It is also worth considering whether a stovetop or microwave could be used instead of the oven for smaller tasks, as these can be more energy-efficient for boiling, frying, or reheating.
Furthermore, choosing the right pan for your bake can help to minimise baking time and reduce energy usage. Metal pans made from steel or aluminium conduct heat evenly and efficiently, whereas glass pans are slow to heat up but retain heat for longer.
Finally, it is worth noting that older ovens may be less energy-efficient, so timely replacement with a newer, more efficient model can lead to long-term savings.
By implementing these simple adjustments, you can reduce both oven bake time and energy usage, contributing to cost savings and a positive environmental impact.
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Frequently asked questions
Energy is neither created nor destroyed during food processing, it simply changes form. This is in line with the First Law of Thermodynamics.
The First Law of Thermodynamics states that energy is conserved in a closed system. In food processing, this means that the energy put into the system (e.g. an oven) is equal to the energy that comes out of the system (e.g. baked goods).
Yes, the Second Law of Thermodynamics is also applicable. This law states that some energy is lost as waste heat. In food processing, this means that not all the energy put into the system is used efficiently, some is lost as heat.
By understanding these laws, we can improve efficiencies. For example, in a bakery, reducing the mass of dough moulds and recovering energy from the oven exhaust to heat a proofing oven can improve energy efficiency.
