SUPERMARKET SYSTEMS AND EQUIPMENT The future of evaporative cooling
Evaporative/adiabatic cooling is a concept that has spanned across the ages, it is recorded throughout the pillars of time that many ancient civilizations used the natural effects of water and evaporation to cool both its people and buildings. Zafer Ure of Ecomesh explains.
T
he Ancient Egyptians are known to have used porcelain clay pots to collect water and have their slaves fan the cooler
air into their vicinity. In a similar yet slightly more advanced manner, the Romans are noted to have actually engineered their aqueducts to circulate water throughout the walls of their houses, hence maintaining a cooler air temperature. Advanced even further, the Persians actually
engineered dedicated building structures, which featured a tower in each corner; at the bottom of these towers was a water reservoir, whilst at the top lay a specially designed roof. The air from outside was captured by the roofs design and funnelled down and across the water reservoir below, cooling the occupants within the building. These accomplishments throughout time are truly amazing; furthermore, offer an insight into the world’s first true HVAC applications. Cooling represents without a shadow of a doubt one of the main sources of power consumption within any modern building application. With an ever-increasing demand from both businesses and individuals alike, many buildings and facilities are being pushed to their technical cooling limits. Increasing energy prices, government regulation in conjunction with the potential consequences associated with a complete system shutdown or cooling failure, has led to a new breed of building services, whereby systems must be far more wisely designed and backup facilities put in place. Even with the smartest possible design however, it is sometimes unavoidable that issues such as heat surges, fluctuations in wind direction and installation environment can affect a HVAC systems
28 April 2020
efficiency. There are many cases in which several Chillers are packaged in tightly together, leading to a domino effect of heat being transferred from one unit into another. This creates an artificial ambient, far higher than the actual ambient outside. In such conditions it is an inevitability that within a minimal matter of time an overheating issue arises and the compressors simply shut down, leading to a complete cooling failure. In response to these issues, a multitude of methods and technologies have arisen, that target evaporative cooling as the solution.
Evaporative Condensers and Cooling
Towers were once seen as the best and most economical solution to this issue, however have come under increasing scrutiny and regulation in recent times as the risks of Legionella become ever-greater, if good maintenance is not ensured.
Although well maintained cooling towers operate effectively, many sites unfortunately do not receive the adequate levels of maintenance to ensure safe operation. This is without a shadow of a doubt one of the primary reasons we can see a significant rise in the adoption of a number of alternative adiabatic technologies such as plastic drift eliminators, rigid/paper
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