Japanese Hot Water Bottle [Yutanpo Japan Import] Size L

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In the context of the energy crisis that we are fearing for this winter, I actually think that somewhat like you, can help a great deal of people in this situation. I’m trying to get other people to read your articles since you have written many articles about alternatives to the “normal” way of heating ourselves (or rather our buildings). I genuinly think that if some of your ideas spread, it might make a significant dent in our gas consumption (and costs of living!). I’m looking at making myself a window quilt for my appartement this winter, I think it would be great if you could get other people on board doing this! There are now also larger hot water bottles available, which hold up to three litres of water or more. Finally, the most successful novelty has the form of a hot dog: it’s a hot water bottle 80 centimetres long. It can be tied around the waist but is just as practical as a companion on the couch or in the bed. It can easily be shared by two people and its shape makes it luxuriously comfortable. It holds up to two litres of water.

Nevertheless, when I sent two dozen hot water bottles to friends and family as a Christmas present, the reactions were almost unanimously enthusiastic. People show themselves very much surprised that such a humble object can provide so much comfort. Because I don’t have the time nor the budget to send hot water bottles to everyone, I have written this article. It’s largely based on my personal experience – I have been using hot water bottles for many years and they are the only heat source in my apartment. The history of the hot water bottle Too hot water can hurt you in several ways. First, there’s always a chance you spill water on your hands while filling the bottle. Second, a rubber or plastic hot water bottle can start leaking, either through the cap or through the seams. Third, and this is the worst-case scenario, a hot water bottle can burst and release two liters of hot water on your body. Such accidents are rare, because nowadays hot water bottles are made according to quality standards. However, they do occur, usually because the bottle has worn out. I see in this documentary about paleolithic techniques, with bladders used as water bottles. Could they be used as hot water for cold nights ? A foment can is filled with hot water and used very much like a hot-water bottle to apply warmth to the body. Fomentation actually means “to apply warm liquids to treat the skin.” This oval-shaped can is curved to fit the body. Maker: Kenworthy Son and Company. Place made: Southport, Sefton, Merseyside, England, United Kingdom. Source: Science Museum, London. (CC BY 4.0). https://wellcomecollection.org/works/gf42542bCo-author of the book "Energie in 2030" ("Energy in 2030"), a project of the "Rathenau Instituut", an organisation that advises the Dutch government on challenges related to science and technology. (2009 - 2011).

Another way to investigate the energy savings potential of the hot water bottle is to calculate how much energy it takes to prepare one and compare that to the energy use of a central heating system. Because rubber or PVC bottles can only be filled up to two-thirds for safe and comfortable use, I assume a somewhat larger model – 3 L – which can hold two litres of water in practice. This makes the calculation also valid for containers that can be filled completely, such as the Japanese yutampo. It takes 4,200 joule to raise the temperature of 1 litre of water by 1°C, meaning that heating two litres of water from 10°C to 60°C requires 420 kilojoule or 116.7 watt-hours. Supposedly, Japanese water therapy gets its name from being widely used in Japanese medicine and among the Japanese people. Heating on full power for 5 minutes works perfectly. Just make sure that the bottle can freely rotate in the oven and heat up evenly. A hot water bottle is a sealable container filled with hot water, often enclosed in a textile cover, which is directly placed against a part of the body for thermal comfort. The hot water bottle is still a common household item in some places – such as the UK and Japan – but it is largely forgotten or disregarded in most of the industrialised world. If people know of it, they usually associate it with pain relief rather than thermal comfort, or they consider its use an outdated practice for the poor and the elderly.

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We use a Water Heated Mattress Pad, basically a small water heater unit, under mattress pad has medical grade tubing running up and down in a pattern. We have an additional fluffy pad on top of the hot water one,to reduce any lumpy feel,works great. Verhaart, Jacob, Michal Veselý, and Wim Zeiler. “Personal heating: effectiveness and energy use.” Building Research & Information 43.3 (2015): 346-354. https://www.tandfonline.com/doi/abs/10.1080/09613218.2015.1001606 ↩︎ Reading your article about water bottles, a possible improvement occured to me. Instead of using water, one could use a phase change material (PCM) instead. These store thermal energy as the lattent heat of fusion of the phase change from liquid to solid. Examples of these are the sodium acetate hydrate used in hand warmers, paraffin (wax) or even water/ice for cooling needs. A lot of these materials have energy densities that are seriously competitive (or even exceed) the energy release by a water bottle that is cooling down. They however have one major advantage: since most of the energy is released during the phase change, these materials will release heat at a constant temperature (melting temperature). Water releases lots of energy at first (at less safe temperatures) but the rate decreases exponentially as the temperature decreases (it’s literally an exponential decay function). This means that PCMs could provide a significant improvement to water bottles, by releasing energy at a more consistent, safer and more useful temperature. Hot water is a safer heat storage medium than hot coals, but it is not without its risks and hot water bottles need to be used carefully. They carry the instruction not to use boiling water, which is very sound advice, but hot water doesn’t need to boil to be dangerous. Water above a temperature of 60°C (140°F) can scald you and lead to very serious injuries.

Instead of using water, one could fill it with paraffin to keep it warm for a guesstimate of 6-8 hours. Heat the paraffin to above melting ‘point’. Unsurprisingly, there’s little – or actually no – academic research into the energy savings potential of hot water bottles. Instead, in recent years scientists have investigated more sophisticated personal heating devices such as electrically heated desks and seats, radiant heat bulbs, or battery-powered heat pillows. [5-7] These alternatives look needlessly complex in comparison to the hot water bottle. Water can be heated in many ways both high-tech and low-tech, and containers can be made from locally available materials.

The “warming pan” or “bed warmer” was a metal container filled with hot coals and fitted with a long handle. It was slid between the bedsheets and then moved across the bed to warm all corners before someone got into it. Yet another solution to warm the bed was the so-called “bed wagon”: a wooden frame or sledge designed to hold a pot of hot coals, which was slid below the bed and covered with a metal sheet. Unlike a warming pan, the bed wagon provided warmth throughout the night. See: http://www.oldandinteresting.com/warming-the-bed.aspx ↩︎