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Published on Nov 12, 2012
Introduction into the operation of Munters patented oasis
Published on Mar 12, 2013
Munters Oasis at Sabey Intergate, Quincy
Published on Sept 23, 2015
Oasis Rooftop Overview
Munters Oasis™ a revolution in Data Center Cooling
Innovative, Efficient, Flexible and Sustainable
The Oasis™ Indirect Evaporative Cooler has been designed in response to the growing demand from data centre owners, operators and designers for a highly efficient cooling strategy. Factors such as energy costs, sustainability policy and increasing IT densities has provoked this shift away from traditional chilled water cooling methods.
The Oasis™ Indirect Evaporative Cooler system has been designed specifically for data centres with energy efficiency as the central driver. The unit takes advantage of the cooling effect created by evaporation of water (liquid) to vapour, and the updated permissible supply air conditions published by ASHRAE.
Three Modes of Cooling
The Oasis™ Optimum DCIE has three modes of operation;
1. Low Ambient* - Air to air heat exchange with no supplemental cooling,
2. Medium Ambient - Air to air heat exchange with evaporative cooling and,
3. High Ambient - Air to air heat exchange with evaporative and mechanical cooling (used when external ambient conditions rise above permissible temperatures
*achieving low energy or “free” data center cooling
The Oasis™ Optimum DCIE cooling system incorporates Munters innovative UL listed Oasis™ Indirect Evaporative Cooling technology; delivering energy efficient cooling while meeting zone A1 and A2 ASHRAE standard through to Tier 4 levels of resilience. (with N+1 components if required)
The heart of this system is the Munters’ patented Evaporative Polymer Exchanger (EPX), which provides ultra-high efficiency cooling while using up to 75% less energy than traditional high efficiency systems. The Oasis™ Indirect Evaporative Cooler uses an evaporative polymer tube heat exchanger module that is at root of the Oasis cooling philosophy. Multiple polymer ribbed tubes mounted in an aluminium frame create a large surface area for heat transfer to take place.
Hot aisle air is drawn through theses polymer heat exchanger tubes as water is sprayed over their exterior, all while filtered, ambient air or scavenger air flows over the wetted exterior of the tubes surface. This optimized evaporative heat exchange allows for up to 75% less energy than traditional cooling systems.
Whole Life Cost Analysis
The focus of the Munters’ Oasis™ Optimum DCIE data center cooling solution is energy efficiency which translates to significantly lower operational expenditure. The Oasis unit is shown to be significantly cheaper over a 15 year period than a chilled water equivalent.
Air Contamination Control
The award-winning design ensures 100% of the data center air is recirculated, reducing the risk of external contamination and humidity control issues. This further allows the Oasis™ cooling system less stringent filtration requirements reducing both the static pressure loss of fans and cost maintenance regimes.
Grey Water Reuse
Mains, grey or harvested water that has been suitably treated can be used for evaporative cooling as opposed to other units with misting that require a mains supply. The chemical make-up of the water changes as the evaporation process progresses. Dirty air that passes through the heat exchanger will also contain contaminants such as pollen and dust that are deposited and washed into the sump. Automatic controls constantly measure the water content and are designed to dump the sump water when calcium content climbs above a set point.
maintains the water in a dark environment, light being an essential component for legionella growth. Water within the unit is continuously moving, eliminating any stagnant water needed for legionella to grow. Sump water temperature is also monitored and dumped if it climbs too high or is left standing for too long. Regular cleaning and drying out of the unit kills any bacteria that might be present and removes any accumulated nutrients.
It is worth noting that the inefficiencies of the chilled water solution compared to the two air optimised technologies can result in the requirement for larger UPS and Power Generation plant, which adds to the spatial take. On the other hand, the Chilled Water solution can be implemented across non uniform or unconventional building shapes that would otherwise not accommodate the air only systems considered here. Chillers and pumping equipment can be placed on the room to reduce the building footprint.
An IAO site will need a smaller power supply than a chilled water equivalent, reducing utility costs of getting power to site and making more sites viable. Transformer and generator ratings can be reduced along with switchgear and cable sizes. This will have obvious cost benefits as well as easing the construction process. Alternatively, reducing the required power (per m2) means that more IT space can be allocated for a given supply of power to site.
Although the cost figures for the mechanical elements of the different options are similar, the increased power requirements for Chilled Water will result in the requirement of a larger electrical support infrastructure (larger Generators and UPS plant), the upshot of which is a greater spatial take and increased capital costs for these options.
The distribution system used for a chilled water system is inherently more intensive than an air optimised solution. Installing pipework, pumps, pressurisation equipment, valves, connecting and commissioning equipment is costlier in terms of programme, labour and materials.
IAO systems require ducted air distribution from the external cooling unit to the floor void or room, and a return from the hot isles back to the cooling unit but this type of infrastructure is less extensive. This system is quicker, cheaper and simpler to install and requires minimal commissioning. With fewer constituent parts, single points of failure are reduced and on-going maintenance is simplified to a few moving parts.
Commissioning of an IAO system, like a chilled water system, requires flushing and pressure testing. Air as the heat transfer medium reduces the risk and waste of this process. With fewer interfaces between heat
transfer mediums, fewer systems need to be verified and the ASHRAE sequence of commissioning levels is reduced.
The Oasis unit is delivered pre-commissioned and tested. Final connection of the electrical power distribution system completes cooling system install, ready for calibration
Backed by our experienced in-house data center teams, Munters has designed and built hundreds of cooling systems for collocation, government, education and commercial clientelle.
Further analysis of installation and maintenance costs is required to highlight the benefits of the Oasis Indirect Evaporative Cooler due to reduced system complexity and fewer moving parts compared to chilled water. A maintenance contract from Munters would require little additional maintenance services for the remainder of the mechanical systems.
Munters Oasis™ Optimum DCIE data centre cooling solution focuses on energy efficiency. The modular design allows owners and operators clear budget optimization at the outset of a new data center build and follows LEED design concepts.
High energy efficiency and sustainability means lower capital expenditure and significantly lower annual operating cost which in turn means a lower carbon footprint.
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