Tag Archives: ventilation

Better Air Quality means Better Performance

We have all had that situation when we have attended meetings, where an individuals performance has lacked. In most of these cases, this is a direct result of the poor quality of the air in the room.

Uncomfortable situations like this need not arise. CO2 displays by Rotronic make it easy to measure air quality, and the results can be used to initiate the appropriate measures. In an enclosed room, some 25 to 35 cubic metres of fresh air per person per hour are needed, given normal activities. This is a real challenge for building management systems as ventilation is costly due to the energy required but room use varies hugely throughout the day. CO2 is the best measure of use building up relative to the number of occupants, activity level and level of natural ventilation.

This ensures that the carbon dioxide (CO2 ) content remains below 1,000ppm (ppm = parts per million [value of the proportion of carbon dioxide in the air]), and that the volatile substances exuded by humans are extracted to a sufficient degree. By comparison, the CO2 concentration in outdoor air is around 400ppm. The CO2 concentration is a good indication of the quality of the air in a room.

Careful planning of ventilation systems

Today, however, an adequate supply of fresh air cannot be taken for granted. In densely built-up housing areas, normal ventilation through the windows is of limited value. A good room climate cannot be achieved by regular airing in all buildings – climate regulating systems are a necessity.

Building owners and ventilation planners should therefore conform to the specifications in the SWKI Directives –“Hygiene requirements for room air systems and devices” – starting with the positioning of the air intake, through the controls of the ventilation and heating systems to the instruction of the occupiers. In the case of more complex systems, the responsibilities for surveillance and maintenance must also be clearly defined. . To keep the ventilation systems functioning reliably, and to
keep them hygienic, they must be carefully planned, constructed, regulated and maintained. Rotronic CO2 displays or CO2 transmitters can then be used to monitor and control these ventilation systems, using our  Rotronic Monitoring System live data is available at all times and alerts can be triggered if conditions are not suitable.

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CO2 Display
The wall-mounted or bench-top CO2 display is an inexpensive display unit that simultaneously measures and records CO2 , humidity and temperature. Equipped with the field-tested and proven ROTRONIC HYGROMER® IN-1 humidity sensor, this instrument offers unbeatable value for money, ideal for existing buildings where control systems cannot easy by modified, such as schools, offices, catering areas multi-use spaces. The instrument can be configured directly with buttons, and stored data can be exported to a USB stick for analysis with the free Rotronic software package SW21.

Be sure to get in touch if you have any questions on the above or have any measurement requirements.

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Importance of Monitoring and Controlling Temperature and Humidity in Hospitals

Control of Temperature and Humidity in Hospitals

Temperature and relative humidity affects the airborne survival of viruses, bacteria and fungi. Thus environmental control in hospitals  is important because of infectious disease transmission from the aerosol or airborne infection.

Environmental exposure is a common hazard for all such organisms (whether viruses, bacteria or fungi) during this journey between hosts. Factors such as temperature, humidity (both relative and absolute), sunlight (ultraviolet light) exposure and even atmospheric pollutants can all act to inactivate free-floating, airborne infectious organisms.


Maintaining hospital premises at a certain temperature and a certain relative humidity (%rh), likely to reduce the airborne survival and therefore transmission of influenza virus. Temperature and RH settings in different parts of a hospital differ slightly between summer and winter.  In summer, the recommended room temperatures range from 23°C-27°C in the ER (emergency room), including in-patient and out-patient areas, as well as X-ray and treatment rooms and offices. The corresponding recommended RH is fairly constant throughout the hospital, between 50- 60%rh. In winter, the recommended temperatures are generally slightly lower, ranging from 20°C in some in-patient and out-patient areas, as well as offices, up to 24°C -26°C in in-patient and out-patient areas.


The recommendations for the newborn baby and the hydrotherapy treatment rooms are higher at 27°C –28°C. Again, the corresponding recommended range of RH is fairly constant, but slightly lower than for summer, ranging from 40%rh -50%rh, but up to 55%rh–60%rh for more critical areas, such as operating theatres and recovery, the intensive care unit and childbirth/delivery suites.

Temperature is one of the most important factors affecting virus survival, as it can affect the state of viral proteins and the virus genome. Virus survival decreases progressively at 20.5°C –24°C then < 30°C temperatures. This relationship with temperature held throughout humidity range of 23%rh- 81%rh.

Facts & figures:
RH (expressed in percentage) describes the amount of water vapor held in the air at a specific temperature at any time, relative to the maximum amount of water vapor that air at that temperature could possibly hold.

At higher temperatures, air can hold more water vapor, and the relationship is roughly exponential—air at high temperatures can hold much more water vapor than air at lower temperatures.


Why do we need to measure relative humidity?

Virus: The survival of viruses and other infectious agents depends partially on levels of RH. At a temperature of 21°C, influenza survival is lowest at a mid-range 40%rh–60%rh. It is also important to note that temperature and RH will always interact to affect the survival of airborne viruses in aerosols.

At High temperatures < 30°C and at high RH <  50%rh may reduce the survival of airborne influenza virus.

Bacteria : For bacteria, the effect of carbon monoxide (CO), enhanced the death rate at less than 25%rh, but protects the bacteria at higher RH ~ 90%rh.

Temperatures above about 24°C appear to universally decrease airborne bacterial survival.

Fungi: Ventilation systems controlling Temperature and Humidity have a significant effect on indoor levels of airborne fungi, with air-handling units reducing, but natural ventilation and fan-coil units increasing the indoor concentrations of airborne fungi.

Dehumidification as well as HEPA filtration can be used to improve indoor air quality.

Different airborne infectious agents (i.e. viruses, bacteria and fungi) will have differing conditions under which they may be optimally suppressed; it will need to be decided which airborne pathogen poses the most risk to patients and staff alike in hospitals.

Thus, in reducing infectious disease transmission specific environmental control of temperature and humidity is vital for hospitals and healthcare premises.

Rotronic can offering a complete system for hospital measurement applications: a proven system that enables healthcare facilities to control and monitor their conditions and remain in conformance with internal or regulatory guidelines.

With the combination of both analogue outputs, controlling the air-conditioning, and digital outputs, linked up to the Rotronic HW4 monitoring software, end users have a clear overview of conditions.

Dr. Jeremy Wingate
Rotronic UK