These studies determined that the amines used to protect the piping networks had a toxic effect on the health of users in buildings who breathed in the humidified air in the workplaces where this type of humidifier was in use. The steam is separated from the condensate (6) by means of a purger.īetween the end of the last century and the beginning of this one, a number of health and hygiene studies found that the volatile organic compounds that penetrated iron piping for boiler steam to prevent them from corroding were harmful for human health. Finally, we have the steam lance or lances (depending on the load of the steam to the HVAC unit and the desired/calculated absorption distance) that injects the steam into the dry air via thermoplastic nozzles (5) calibrated to prevent condensation and noise.
These systems whose functional model is shown in figure 1 consist of a reducing valve to move the boiler steam at an adjustable pressure in HVAC systems (from 1 to 15 bars), a small Y-shaped filter to filter the steam from the network (1), one or more steam lances with a heating jacket (1) through which the pressurised steam flows to prevent condensation of the steam that we inject, a steam separator (2) which separates the liquid from the dry steam (3) by the centrifugal force that produces the spinning of the steam using a baffle, a steam intake in the centre of the separator, a control valve(4) that modulates the steam injection according to demand and restores the steam to almost atmospheric pressure.
This kind of equipment has been in use for over forty years with very good precision, high durability and virtually zero maintenance. Systems to feed water vapour to dry air were firstly designed as a complement to centralized networks of boiler water designed for heating or industrial processes by means of humidifiers that treated part of that pressurised steam in order to be able to inject it into the primary air ducts in winter.
During the early years of air humidity control, the first configuration of the air humidifier was the one shown in figure 1. This humidity control became increasingly important in Spain until the national regulation, issued by the Regulations on Heating Installations in Buildings of 1997, made the control of relative humidity in all public buildings mandatory. The feeding of water vapour, using air humidifiers to achieve a controlled relative humidity level in the human-occupied environment, began to increase in popularity in the early 1970s. HVAC technology is in many cases derived from technology applied to industrial processes. The purpose of this article is to relate the importance of the steam’s quality for HVAC installations, the current regulations and the generating systems that are now at the cutting edge of air humidity control equipment design. The terms is used to refer to it as a heat-conveying fluid or a source to provide specific humidity to the dry air flows in HVAC systems in pharmaceutical installations. For some time now, the expression “clean steam” has drawn the attention of technicians who have been using steam for a range of different purposes in the pharmaceutical industry.
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