FVB conducts a follow-up study on Europe’s largest hot water reservoir

FVB conducts a follow-up study on Europe’s largest hot water reservoir

In Västerås, Mälarenergi is building Europe’s largest hot water reservoir in a rock cavern. The reservoir will hold 300,000 cubic meters of water, which can cover the district heating requirements in the city for up to two weeks. FVB has been commissioned by Energiforsk to conduct a technical follow-up of the reservoir.

The rock cavern was formerly an emergency reservoir for fuel oil but was shut down in 1985. It is now being turned into a huge hot water reservoir. However, first all the old oil must be cleaned up. As there was more oil left than expected, the clean-up has been difficult, and the work has taken longer than expected.

“The rock cavern consists of three spaces that are similar to three huge accumulator tanks that can be controlled individually,” explains Ulrika Sagebrand at FVB, who is leading the research project.

“We will perform measurements in one of the rock caverns, because we expect the other rock caverns to behave in a similar way,” she continues.

An important part of the project involves investigating how the temperature stratification of the water behaves. They will therefore install a temperature gauge at each meter and since the rock cavern is 25 meters deep, there will be a total of 25 temperature gauges.

There is a service tunnel above the rock caverns where personnel from Mälarenergi can access equipment and the hot water is fed in and out. There is also an instrument in the service tunnel that measures how much water there is in the rock cavern, its temperature and more.

“We do not have any such service tunnel over our measuring site, and this will be a challenge for us, so we will attach multiple sensors to a line with a sinker, which will keep them anchored to the bottom of the rock cavern and floating buoys that will hold the sensors up. It’s a practical challenge to get this in place and we are working on it right now. We will also use Mälarenergi’s measurement data for our analysis,” says Ulrika Sagebrand.

“In addition, we will find out how quickly the cavern is heated by the hot water. We will measure the temperature ten meters into the actual rock itself in five different places.

In the project, we will also summarize the current knowledge situation and describe how Mälarenergi has gone about the work of converting the rock cavern for oil into a hot water reservoir. Another goal of the project was to report results from the initial operation, but there will be changes due to delays in the clean up work. Mälarenergi had hoped that the rock cavern would be cleaned up and ready to be filled in the summer of 2023, but since the clean-up work took so long, they will not be able to start filling the reservoirs with hot water until May. They then have to wait another year, because the energy company has to fill hot water when they have access to cheap energy, which is during the summer months.

“It’s unfortunate for our research project, as we were going to follow up on how the project went from a technical standpoint with the storage and layering of the water. The study will be finalized in autumn 2024, and hopefully we can do that part in a follow-up.”

Ulrika Sagebrand still sees major benefits in the project.

“Even though we don’t have time to get all the values during the planned research period, we will have all the sensors in place, which is important since the caverns will be off limits in the future. These sensors will also be able to be used for other follow-up projects in the future.”

Why is this research project so important?

“There is a renewed interest in large-scale thermal storage in the district heating industry for environmental and economic reasons. Our study can provide important information for other seasonal storage solutions. New knowledge is needed because few studies has been done recently.

“A big difference from older studies is that there is now a greater interest in using existing rock caverns. Previously, new rock caverns were built for storage, but using an existing rock cavern involves some other challenges, and we’re looking at those in more detail in our research project.”

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Typically thought of as being an easy to clean area of the home, hard floors have risen in popularity in recent decades. Globally, hard floors are the most common floor type,2 and research released today by Dyson has uncovered poor cleaning habits that mean hard floors are likely to be harbouring an array of hidden nasties. This comes as 32% of Brits – equating to 21.6 million people in the UK – will use the same dirty mop head for six months or more before replacing it. What’s more, one in 20 also admit to keeping the same mop for a year or longer, and one in 10 think it is acceptable to use the same mop 100 times, spreading dirt around their floors every time they use it. Cross contamination is a primary issue for most common and traditional mopping methods with germs and bacteria further being unknowingly spread around homes as Brits use dirty water to clean floors.3 45% only change the water to new water between rooms, whereas 41% wait even longer until it looks dirty. This could mean that floors are being washed with dirty water, adding more dirt rather than taking it away. Surprisingly, almost one in 10 (9%) even admit to not changing the dirty water at all when mopping. Over a quarter (28%) admit to mopping their floors once a fortnight or less while over half (53%) admit they don’t regularly clean behind appliances and leave dirt to build up for as long as six months at a time. image002.jpg On how to achieve a perfect barefoot clean feel after mopping, Geli Lee, Dyson Engineer and Home Cleaning Expert offers their top tips for eliminating dirt around the home: 1. Create a cleaning schedule to stay on top of dirt build-up. In the last year, there has been a 15% global reduction in the number of people who maintain regular cleaning schedules. 47% of the British public admitted to only being motivated to clean when they spot visible dirt or dust.4 Regular floor cleaning with a wet hard floor cleaner like the Dyson WashG1™ removes more stubborn dirt than vacuuming alone. It is important to have a debris free surface, clear any clutter from the floor or other surfaces. Choose the right machine: Different vacuums are designed for different floor types and home sizes. Some machines will be engineered with hard floors in mind and will struggle on thick pile carpets, for example. Choosing the right machine for your home will make a big difference to the ease and speed with which you’re able to clean your home. Clean your floors ‘little and often’. Washing your floors frequently in areas that receive more foot fall will help to stop dirt building up and getting trodden into your floor. Using a dedicated wet floor cleaner on hard flooring such as the Dyson WashG1 is helpful for this, as the versatile format means it vacuums and washes the floor simultaneously. Cleaning schedules have also become less regimented. In recent years only 41% of people claim to have a regular cleaning schedule, and 60% admit to cleaning reactively; being motivated to clean only when there is visible dirt or dust5. It’s perhaps not surprising, that a fifth of people are still concerned their floors are dirty after they’ve mopped them (22%) and one in four6 feel extremely worried about indoor dust at home. Geli Lee, Dyson Engineer and Home Cleaning Expert reveals why it is important to change the way we mop: “Cleaning your hard floors properly and regularly is important for maintaining a healthy environment around your home. Without a proper cleaning routine, dirt may unknowingly build up and spread around your home. It is evident from our research that current mopping habits mean British households aren’t cleaning their floors as effectively as they should. “From ignoring problem areas where dust and debris build up, cross contamination with dirty water to not replacing mop heads or inconsistent cleaning, current mopping behaviours may be making floors dirtier as opposed to cleaner. Moving away from traditional methods, wet floor cleaners like the Dyson WashG1 simplify the floor cleaning experience and provide a modern efficient and hygienic solution” To help take the guesswork out of mopping, the brand new WashG1 is Dyson’s first dedicated wet floor cleaner that tackles wet and dry debris in one go. Engineered for hygienic cleaning and maintenance, the WashG1 is revolutionising wet floor cleaning, removing the need for multi-products and multi-steps to achieve a barefoot clean feel around the home. To put the product to the test, Dyson have cleaned one of London’s most iconic landmarks The Victoria and Albert Museum. From cleaning the grand marble floors housing the most prestigious exhibits, to cleaning up leftover food in the Gamble Room Cafe, the WashG1 had a dirt busting tour of the museum leaving it spotless. Images can be found here. The WashG1 introduces Dyson’s engineering expertise to cleaning hard floors. With a 1 litre clean-water tank to cover flooring up to 290m2, the Dyson WashG1 uses a combination of hydration, absorption, and extraction technologies to remove wet and dry spills and stains simultaneously. The Dyson WashG1 is available to purchase now from Dyson.co.uk, retailing at £599.99.

Typically thought of as being an easy to clean area of the home, hard floors have risen in popularity in recent decades. Globally, hard floors are the most common floor type,2 and research released today by Dyson has uncovered poor cleaning habits that mean hard floors are likely to be harbouring an array of hidden nasties. This comes as 32% of Brits – equating to 21.6 million people in the UK – will use the same dirty mop head for six months or more before replacing it. What’s more, one in 20 also admit to keeping the same mop for a year or longer, and one in 10 think it is acceptable to use the same mop 100 times, spreading dirt around their floors every time they use it. Cross contamination is a primary issue for most common and traditional mopping methods with germs and bacteria further being unknowingly spread around homes as Brits use dirty water to clean floors.3 45% only change the water to new water between rooms, whereas 41% wait even longer until it looks dirty. This could mean that floors are being washed with dirty water, adding more dirt rather than taking it away. Surprisingly, almost one in 10 (9%) even admit to not changing the dirty water at all when mopping. Over a quarter (28%) admit to mopping their floors once a fortnight or less while over half (53%) admit they don’t regularly clean behind appliances and leave dirt to build up for as long as six months at a time. image002.jpg On how to achieve a perfect barefoot clean feel after mopping, Geli Lee, Dyson Engineer and Home Cleaning Expert offers their top tips for eliminating dirt around the home: 1. Create a cleaning schedule to stay on top of dirt build-up. In the last year, there has been a 15% global reduction in the number of people who maintain regular cleaning schedules. 47% of the British public admitted to only being motivated to clean when they spot visible dirt or dust.4 Regular floor cleaning with a wet hard floor cleaner like the Dyson WashG1™ removes more stubborn dirt than vacuuming alone. It is important to have a debris free surface, clear any clutter from the floor or other surfaces. Choose the right machine: Different vacuums are designed for different floor types and home sizes. Some machines will be engineered with hard floors in mind and will struggle on thick pile carpets, for example. Choosing the right machine for your home will make a big difference to the ease and speed with which you’re able to clean your home. Clean your floors ‘little and often’. Washing your floors frequently in areas that receive more foot fall will help to stop dirt building up and getting trodden into your floor. Using a dedicated wet floor cleaner on hard flooring such as the Dyson WashG1 is helpful for this, as the versatile format means it vacuums and washes the floor simultaneously. Cleaning schedules have also become less regimented. In recent years only 41% of people claim to have a regular cleaning schedule, and 60% admit to cleaning reactively; being motivated to clean only when there is visible dirt or dust5. It’s perhaps not surprising, that a fifth of people are still concerned their floors are dirty after they’ve mopped them (22%) and one in four6 feel extremely worried about indoor dust at home. Geli Lee, Dyson Engineer and Home Cleaning Expert reveals why it is important to change the way we mop: “Cleaning your hard floors properly and regularly is important for maintaining a healthy environment around your home. Without a proper cleaning routine, dirt may unknowingly build up and spread around your home. It is evident from our research that current mopping habits mean British households aren’t cleaning their floors as effectively as they should. “From ignoring problem areas where dust and debris build up, cross contamination with dirty water to not replacing mop heads or inconsistent cleaning, current mopping behaviours may be making floors dirtier as opposed to cleaner. Moving away from traditional methods, wet floor cleaners like the Dyson WashG1 simplify the floor cleaning experience and provide a modern efficient and hygienic solution” To help take the guesswork out of mopping, the brand new WashG1 is Dyson’s first dedicated wet floor cleaner that tackles wet and dry debris in one go. Engineered for hygienic cleaning and maintenance, the WashG1 is revolutionising wet floor cleaning, removing the need for multi-products and multi-steps to achieve a barefoot clean feel around the home. To put the product to the test, Dyson have cleaned one of London’s most iconic landmarks The Victoria and Albert Museum. From cleaning the grand marble floors housing the most prestigious exhibits, to cleaning up leftover food in the Gamble Room Cafe, the WashG1 had a dirt busting tour of the museum leaving it spotless. Images can be found here. The WashG1 introduces Dyson’s engineering expertise to cleaning hard floors. With a 1 litre clean-water tank to cover flooring up to 290m2, the Dyson WashG1 uses a combination of hydration, absorption, and extraction technologies to remove wet and dry spills and stains simultaneously. The Dyson WashG1 is available to purchase now from Dyson.co.uk, retailing at £599.99.

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