{"id":4087,"date":"2024-09-17T07:21:55","date_gmt":"2024-09-17T05:21:55","guid":{"rendered":"https:\/\/wpethzprd.ethz.ch\/energy\/?p=4087"},"modified":"2025-03-27T16:14:04","modified_gmt":"2025-03-27T15:14:04","slug":"temptrim","status":"publish","type":"post","link":"https:\/\/blogs.ethz.ch\/energy\/temptrim\/","title":{"rendered":"TempTrim: A tool to increase our understanding of potential energy savings in public transport heating"},"content":{"rendered":"\t\t
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By Bea Movido<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Bea Movido is currently pursuing her Master\u2019s degree in Science, Technology and Policy (Minor in Energy and Mobility) at ETH Zurich while also working as a research assistant at the Energy and Technology Policy Group. She is particularly interested in promoting clean energy access for social and economic development, working towards a just and equitable low-carbon transition for all.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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A significant amount of electricity is required to keep trams and buses warm during the winter. How can we reduce this excessive energy consumption? As part of the EnergyNow! 2.0 Impact Accelerator Program, TempTrim was developed as a tool to quantify potential energy savings from adjusting vehicle temperature settings. This project garnered the Audience Award at the Finale Night of EnergyNow! 2.0.<\/h3><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Switzerland\u2019s domestic energy supply has consistently failed to keep up with winter demand. From 2003-2019, the average winter energy deficit<\/a> was 4.4 TWh (around 12.6%), but this number has surged in recent years due to the decommissioning of nuclear power plants and an overall rise in electricity demand. In the winter of 2022, people were increasingly worried about a looming energy crisis associated with disrupted supply after Russia\u2019s invasion of Ukraine and the resulting EU sanctions<\/a>. Although a major energy shortage was successfully avoided, the Swiss government still urged the population to limit their winter energy consumption<\/a> through various energy saving measures amidst rising prices, reduced capacities, and growing concern over climate change.<\/p>

The Zurich public transport service, Verkehrsbetriebe Z\u00fcrich <\/a>(VBZ), has acknowledged that during wintertime, a considerable amount of energy is used by their trams and buses to ensure the thermal comfort of their passengers. They estimate that on the coldest days, the energy demand for heating the trams is even comparable to the energy demand for driving them. However, when deciding on the temperature set-point to fix on all their trams, public transport operators like VBZ are generally unaware of the savings that could be achieved simply by lowering vehicle temperatures.<\/p>

TempTrim as a solution<\/strong><\/h2>

As one of the industry partners of the Energy Science Center\u2019s EnergyNow! 2.0 Impact Accelerator Program<\/a>, the VBZ proposed the development of a web-based tool that would allow public transport operators to assess and optimize energy consumption within their fleets, with a particular focus on their heating systems. Our team \u2013 consisting of ETH students Florian Schubert, Clara Tillous Oliva, Yash Dubey, Oleksandr Halipchak, and myself \u2013 responded to this call by developing the TempTrim app<\/a>.<\/p>

TempTrim was designed to quantify the potential energy savings that could be achieved by adjusting the heat settings in trams. This was based on a thermodynamic model<\/a> that estimates the electric energy consumed by the heating system of a tram fleet. Validation was done using experimental data from the Cobra fleet<\/a>, which was collected by VBZ for a preliminary analysis.<\/p>

Users can input their fleet specifications, operating schedule, heating system characteristics, and cost of electricity into the TempTrim dashboard. Geographic location is also needed to determine the ambient temperature based on climate data from the EU Photovoltaic Geographical Information System<\/a>. It will then calculate the amount of heat needed to achieve the desired temperature, the electricity required to generate this heat, and the associated electricity costs. Several temperature set-points can be compared to determine the difference in potential savings.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Figure 1<\/strong>: TempTrim calculates the total energy and associated costs to achieve the desired temperature, and displays the output as shown above.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Using TempTrim, we found that lowering the set-point temperature from 20\u00b0C to 18\u00b0C would result in an 18MWh decrease in electricity consumption for a single VBZ Cobra tram. Lowering the set-point to 18\u00b0C for the entire fleet with 70 trams in operation can therefore decrease yearly consumption by 1.27GWh (22.4%). That much electricity could be used to power nearly 500 households in Switzerland for a year!<\/p>

Opportunities and potential barriers<\/strong><\/h2>

With the information provided by TempTrim, public transport operators would be able to identify and quantify loss mechanisms that affect the efficiency of their heating systems. They can then be empowered to adopt the necessary operational changes to correct this. Referring again to the VBZ Cobra tram, the instantaneous power values show that nearly half of the heat within the vehicle is lost through the open doors. Operators should then optimize door control \u2013 perhaps only open doors on-demand, or lessen the time that the doors remain open \u2013 to reduce airflow and conserve heat.<\/p>

TempTrim can also be used by policymakers to evaluate different operational scenarios and determine the most appropriate policy measures to save energy. However, implementation will not come without any challenges, as making changes to public transport systems generally involves many stakeholders that may have competing interests. For instance, it may be costly to retrofit existing vehicles with the necessary technologies to conserve heat, and users might not be willing to shoulder that expense. Passengers could also have different preferences in terms of temperature, and some may value thermal comfort over energy savings.<\/p>

Last November, we presented the TempTrim tool at the 10. Forum Nachhaltige Energie<\/a> organized by Verband \u00f6ffentlicher Verkehr<\/a> to collect insights from practitioners and experts in the field. Given the positive feedback we received, we are hopeful that our solution can be further developed and used to significantly help the public transport sector reduce their electricity consumption, thereby easing the burden on our energy systems.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Cover image: VBZ<\/p>

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Keep up with the Energy Blog @ ETH Zurich on Twitter @eth_energy_blog<\/a>.<\/em><\/p>

Suggested citation: By Bea Movido. \u201cTempTrim: A tool to increase our understanding of potential energy savings in public transport heating<\/em>\u201d, Energy Blog @ ETH Zurich, ETH Zurich, September 17th, 2024, <\/em>https:\/\/blogs.ethz.ch\/energy\/temptrim\/<\/em><\/a><\/p>

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If you are part of ETH Zurich, we invite you to contribute with your findings and your opinions to make this space a dynamic and relevant outlet for energy insights and debates. Find out how you can contribute<\/a> and contact the editorial team here<\/a> to pitch an article idea!
<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

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