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MEP Pojects and high temperatures – do you know the risks?

Heatstroke kills 32 year old former athlete

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Recently the sports world was rocked by the death of a young former football star who died from heatstroke. See the reports from the BBC and CBS news.World temperatures are rising and recently parts of Europe and the USA have experienced some of the hottest recorded temperatures. This last summer Australia also experienced record breaking temperatures.

So what can we do about heatstroke? Well this report from the BBC tells us more about the effects of heat on the body.

Those in construction are at particular risk of suffering heat related illnesses since they are often expected to do hard physical tasks for long hours, often out in the open.


Dealing with hot weather on projects

​It’s important that everyone on your construction project is aware of the risks that high temperatures pose. Everyone must be aware of the early symptoms of heat exhaustion so they can take quick corrective action before the situation deteriorates to full heatstroke. There should always be an adequate supply of cool fresh drinking water and workers must be encouraged to drink lots of water. Workers must be allowed to take frequent rest breaks in a cool environment. Where possible try and start work earlier when the day is still cool. Possibly schedule some tasks for the night – particularly pouring concrete. Rotate workers so that one worker isn’t working on a strenuous task all day.Be aware that people on medication, those taking drugs or consuming excess alcohol and caffeine may be more susceptible to suffering the ill effects of high temperature. Those use to working in more moderate and cooler climates are also not as use to working in hot conditions as others may be who have become acclimatised to these conditions, so it’s important to understand that people will be impacted differently by the heat.

High temperatures will impact productivity, but the construction schedule should not endanger people’s lives. Extreme temperatures above the norm may be reason to lodge a variation claim with the client.

Of course heat doesn’t also impact people’s lives it can impact concrete and other products. Concrete, mortar, adhesives and paints will all dry out rapidly, which could lead to problems with finishing the work as well as cracking and other problems.

Take adequate precautions to ensure that heat doesn’t endanger safety or impact quality on your construction project. Working in a cool office may insulate you from the severe heat while others on the project have to deal with the full impacts of the hot temperatures.

How will your project deal with the high temperatures?

AirCo Pakistan | Maintenence | Troubleshooting | Installations

IOR unveils revised good commercial refrigeration guidance

The Institute of Refrigeration (IOR) has partnered with the British Refrigeration Association (BRA) to revise the second part of its Guide to Good Commercial Refrigeration Practice with a focus on safety and environmental considerations.

Revisions that have been announced to the guide, the second part of which looks at system design and components, ties in to a wider nine-part focus on good practice for organisations working with refrigeration, heat pumps and air conditioning systems.

According to the IOR and BRA, the updated guide on system design and component selection, as outlined in part two, considers the complexities of addressing both environmental and safety considerations when planning the introduction of new cooling approaches.

A joint statement on the guide said, “It comprises chapters on compressors, chilled and frozen cabinets, condensers, refrigerant pipework, design considerations, plant room design and more. In this edition, the chapter on evaporators has been extensively revised and references have been updated throughout.” 

The second edition of the guidance on system design and component selection is expected to be followed with similar updates to the other eight remaining parts of the series over the next twelve months.

This will cover a range of topics focusing more specifically on changing safety and environmental considerations for different forms of cooling appliances, to system installation and commissioning. 

Other specific focuses of the guidance will focus on system maintenance and service, as well as a publication looking at the decommissioning and waste disposal process.

The eighth part of the series looks at refrigerant and retrofitting, with a final focus published in association with ACRIB focusing on the themes of competence, training and skills.

Members of both organisations are able to access the update free of charge, while the publication can be purchased separately by non-members.

 

AirCo Pakistan – Air Conditioning Solutions

Panasonic goes “big” with R32

UK: Panasonic has introduced the Big PACi series of air conditioners in 20kW and 25kW capacities using R32 refrigerant.

The additions include a water heat exchanger option and a split-able duct indoor unit which can be divided into the heat exchanger and fan parts, allowing for easier installation within narrow spaces such as small retail shops.

As well as being more efficient than its R410A counterparts, the R32 Big PACi series offers a reduced refrigerant charge. The indoor unit is also up to 16kg lighter in weight than conventional Big PACi R410 models.

Designed for easy installation, the new models are said to have a more compact indoor chassis with the depth reduced by 230mm versus the conventional Big PACi R410A range. The compact design is said to still maintain the same level of efficiency overall and has an SEER rating of up to 5.25 and SCOP rating of 3.61.

AirCo Pakistan – Troubleshooting, Maintenance, Installation

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AI design can reduce heat pump energy consumption

SWITZERLAND: Artificial intelligence is being used to design next-generation microturbocompressors which could reduce heat pumps’ power requirement by 20-25%.

Turbocompressors are more efficient and ten times smaller than piston devices, but incorporating these mini components into heat pumps’ designs is not easy – complications arise from their tiny diameters (<20mm) and fast rotation speeds (>200,000rpm).

Researchers at the Laboratory for Applied Mechanical Design at Lausanne’s EPFL (École polytechnique fédérale de Lausanne) have developed a method that is said to  make it easier and faster to add turbocompressors to heat pumps. Using a machine-learning process called symbolic regression, the researchers came up with simple equations for quickly calculating the optimal dimensions of a turbocompressor for a given heat pump.

The researchers’ method is said to drastically simplify the first step in designing turbochargers. This step – which involves roughly calculating the ideal size and rotation speed for the desired heat pump – is extremely important because a good initial estimate can considerably shorten the overall design time. Until now, engineers have been using design charts to size their turbocompressors – but these charts become increasingly inaccurate the smaller the equipment. Also, the researchers argue that the charts have not kept up to date with the latest technology.

The EPFL team fed the results of 500,000 simulations into machine-learning algorithms and generated equations that replicate the charts but with several claimed advantages: they are reliable even at small turbocompressor sizes; they are just as detailed as more complicated simulations; and they are 1,500 times faster. The researchers’ method also lets engineers skip some of the steps in conventional design processes. It paves the way to easier implementation and more widespread use of microturbochargers in heat pumps, they argue.

AirCo Pakistan –  Maintenance, Troubleshooting, Installations.

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