Understanding motorcyclists for safer driving
Home
Author: Dr Pat Bonello
The theme of this edition of THINK magazine is meant to evoke feelings of belongingness, identity, warmth, and solidarity. Our home is usually a place associated with these positive feelings: a place where I can be myself and, in a safe environment, develop into the me I want to be. This is something valuable, something which we should safeguard passionately. At the same time, as a social worker, I know many people for whom ‘home’ does not have such positive connotations.
The people that come to mind are abuse victims, children and adults living with domestic violence. For them, ‘home’ means suffering, often accompanied by a feeling of helplessness. Others find ‘home’ a difficult concept. Think of people who cannot make ends meet, who have difficulty paying their rent, who cannot afford to buy their own house because of high property prices. Then there are those who can no longer live in their own house because they are unable to look after themselves, be it because of old age or health issues. There are members of broken families who have difficulty identifying their home, asylum seekers who left home behind, and people who have lost a family member and now associate ‘home’ with sadness.
Everybody needs a place where he or she feels ‘held’ and safe enough to develop his or her potential. But if ‘home’ does not fit this bill, where will this environment be?
This is where a network of social solidarity, both formal and informal, comes into play. Alternatives for people with issues related to the concept of ‘home’ include foster placements, shelters, or other residential facilities. But these services are tasked with much more than providing mere accommodation. They need to create an environment which meets the needs of the persons who live there. They need to provide a safe space for people to come in, be themselves, and develop their potential.
For those who don’t need to move out of their current home, options include support and professional interventions, such as family therapy, to deal with the sadness associated around the home, or to improve the dynamics within it. Social service providers in Malta and Gozo carry a lot of responsibility. Unfortunately, the supply does not always meet demand, and some people have to wait considerably before being able to move into more comfortable and nurturing placements—sometimes while living in abusive environments. In other situations, the necessary support is not readily available, as in the cases of asylum seekers and homeless people who need a roof over their head.
While formal support is important and necessary, all Maltese citizens need to share the responsibility and offer a helping hand without judgement. That way, Malta will be able to nurture communities that work together to create ‘homes’ which cherish everyone, respecting their dignity and worth and encouraging them to flourish.
Cool batteries are good batteries
As consumers, we are all-too-familiar with the daily chore of charging our smartphones or tablet. With increasing emphasis on greener technologies such as electric vehicles and renewable energy generation, battery technology becomes more important. Words by Dr Robert Camilleri.
As consumers, we are all-too-familiar with the daily chore of charging our smartphones or tablet. With increasing emphasis on greener technologies such as electric vehicles and renewable energy generation, battery technology becomes more important.
Classic lithium-ion (Li-ion) batteries are currently the most common, storing energy in chemical form. The problem with these is their temperature sensitivity. During repeated cycles of charging and discharging, the chemical reaction that drives the battery creates heat which affects its storage capacity and lifetime. Not only that, but these high temperatures present a real health and safety concern. Thermal runaway, where a battery creates a vicious cycle of heat generation, can lead to catastrophic failure. Remember the Galaxy Note 7 explosions? So how can we cool batteries down?
Keeping things chill
While a number of studies have attempted to apply traditional cooling (such as the air cooling in the laptop I’m using to write this article) to batteries, this was found to be inefficient for high-performance battery packs. As air passes over the battery cells, it gradually warms up and its effectiveness cooling subsequent batteries deteriorates, leaving battery cells in the same pack operating at different temperatures. The battery cell with the highest temperature becomes the weakest link.
The need to have a fast charging mechanism, especially when it comes to consumer products, is real.
High temperatures limit dis/charging rates and energy storage capacity, causing batteries to degrade faster, dictating the life of the pack. While attempts to use liquid cooling proved to be more efficient than air cooling, they still did not solve the issue. To counter this problem, the industry has developed complex and expensive electronic battery management systems that monitor the temperature of each cell and adjust the charging rate. But again, while this protects the cells, it limits the current flow during discharging, causing long waiting times in between battery use. The need to have a fast charging mechanism, especially when it comes to consumer products, is real. Battery-powered electric vehicles, for example, are much more likely to be accepted if a fast charging mechanism is introduced. This would make them comparable with regular cars that need to be taken to traditional petrol stations for fuel.
A different approach
Our project NEVAC (short for Novel EVAporative Cooled battery technology) solves this problem with a novel cooling strategy. With NEVAC, we want to keep the entire battery pack at a uniform temperature. We’re using a liquid coolant with a low boiling point which absorbs latent heat as battery cells warm up. When the coolant reaches its boiling point, it evaporates and turns into gas. The gas travels to a cooler part of the battery pack, lets off the heat it has absorbed into the ambient environment, and condenses back to liquid, closing the loop of this self-sustained cooling cycle. As the coolant within the entire battery pack boils at a single temperature, all the battery cells within the pack are kept at one uniform temperature.
NEVAC is currently developing an experimental proof of concept of this technology with Abertax, our industrial partner. Following a proof of concept, the project will be scaled up with the prospect of developing the technology for the market. It will show how an improved battery cooling technology will lead to higher battery storage capacity, longer battery life, and better dis/charging rates. That daily chore of charging your smartphone for more than a few minutes could soon be forgotten.
The research is led by Dr Robert Camilleri (University of Malta), in collaboration with industrial partner Abertax Kemtroniks. Project NEVAC is funded by the Malta Council for Science and Technology Fusion: The R&I Technology Development Programme 2017.
Read more:
Selyukh, A., As Batteries Keep Catching Fire, U.S. Safety Agency Prepares For Change, retrieved on 30th March 2017
https://n.pr/2fBZsfJ
Author: Robert Camilleri
Rockets that Fail Safely
