The absence of a standard for indoor air quality in UK oces and other workplaces is an omission that needs to addressed, says John Barker, Managing Director of Humidity Soluons.

although poor IAQ is still prevalent in many workplaces. Currently, tackling IAQ issues is at the discretion of each organisation; there is no legislation to set an acceptable IAQ standard and ensure it is enforced. Given that most of us spend up to 90% of our time indoors, much of which is in the workplace, this clearly merits urgent attention. At home, we can take our own measures to maintain good IAQ but at work, we depend on the systems in place and how they are operated. Our cities are becoming increasingly polluted with car fumes, airborne industrial waste and even particulates from log burners. And this heavily polluted air is pulled into our buildings – referred to as ‘fresh air’ ventilation. But although it is filtered, there is no standard requirement for the level of filtration. Most air conditioning is just temperature control for thermal comfort. Such


ssues surrounding indoor air quality (IAQ) have become more prominent in recent years,

systems aren’t necessarily providing adequate filtration of incoming air or controlling the relative humidity (RH). Thus, they are not meeting the true definition of air conditioning as ‘a system for controlling the humidity, ventilation, and

temperature in a building or vehicle, typically to maintain a cool atmosphere in warm conditions’. This highlights the importance of humidity control in achieving thermal comfort and good IAQ, not least due to the interactions between RH and airborne pathogens. For instance, low RH (<40%) enables these pathogens to remain suspended in the air for long periods, so they can travel further and spread infection across a wider area. Viruses such as influenza and norovirus survive longer at an RH of 20- 30%, whilst a mid-range RH between 40% and 70% will minimise their survival. Tests also indicate the infectivity of the influenza virus is increased by both low and very high RH, with minimum infectivity at 50% RH. RH has been shown to have a similar effect on

The Next Generation of CO2, Humidity and Temperature sensors

From Titan Products Ltd. Two new CO2 Room Sensors for a connected world

Automatic Background Calibration maintaining long term stability

Combined CO2, Humidity and Temperature monitoring

Adversing: 01622 699116 Editorial: 01354 461430 Time to standardise workplace IAQ

airborne bacteria, with intermediate RH levels increasing the mortality rate of airborne pneumococci, streptococci and staphylococci. There is no specific legislation relating to RH in general workplaces, though many organisations

recommend maintaining an RH of 40-60% in commercial workplaces. These include the Humidity Group of the Hevac Association, the World Health Organisation and the National Association of Optometrists. This is also the range recommended by BS EN 29241 as the optimum for visual display terminals. Above 60%, people will feel uncomfortable out of all proportion to the actual indoor temperature, with reduced capacity to focus. If comfort cooling is installed, occupants will typically reduce the set point to alleviate that discomfort, resulting in increased energy costs. High humidity also

Greatly reduced installation costs and time Fully open and interoperable communications

encourages mould growth and it may also result in condensation on cold surfaces, potentially causing damage or a slip hazard. RH below 40%, however, makes people feel colder than the actual temperature would suggest so they turn up the heating and, again, increase energy

Help maintain comfortable conditions to aid productivity

Smart BACnet/Modbus sensor

• Native BACnet MS/TP or Modbus RTU communications

• Fully interoperable with 3rd party devices

• Reduction in installation costs • Accurate data sent directly to BMS • 1x digital input, 1x digital output

 retail and commercial environments

Zigbee 3.0 sensor

• Zigbee 3.0 wireless communications • Fully compatible with Zigbee 3.0 and HA1.2 devices

• Battery powered • Up to 5 year battery life • Up to 60m indoor signal range • Flexible, quick and cost effective installation

consumption. Raising the set point temperature also lowers the RH even further so the problem is exacerbated. Low RH may also cause a wide range of health problems and increase the rate of absenteeism. Problems relating to RH in the UK tend to be because of low humidity. In winter, buildings are usually heated to around 20°C and as the temperature rises the RH falls dramatically. For example, outdoor air at -5°C and 100% RH has a moisture content of 0.0025kg moisture per kg of dry air. When raised to 21°C dry bulb, with no

Titan Products Ltd. 15 Latham Close, Bredbury Park Ind. Estate, Stockport, Cheshire SK6 2SD

Tel: +44 (0)161 406 6480 Email: Follow Titan Products on Twitter @titanproducts 24 BUILDING SERVICES & ENVIRONMENTAL ENGINEER SEPTEMBER 2018

humidification control, the resultant RH is a mere 18%. This brings the focus back to what we do with outside air as we pull it into buildings. VISIT OUR WEBSITE:

Firstly, we need to ensure that pollutants are removed using effective filtration that is dictated by appropriate IAQ regulations.

Secondly, in addition to tempering incoming air to either raise or lower the temperature, we need to control the RH to ensure that it contributes positively to both thermal comfort and IAQ.

I believe the main barrier to properly addressing these IAQ issues is commercial. We seem to shy away from setting coordinated regulated standards to ensure excellent IAQ as this would result in extra investment in plant and slightly higher running costs due to higher maintenance requirements. What we should be considering as an industry, employers, employees and society as a whole is whether improving IAQ to underpin improved health and wellbeing is worth that investment. I believe it is.

uAirtec high pressure humidificaon.

uHumidifier sprayer in oce.

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58