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SUPPLEMENT FEATURE DATA CENTRE MANAGEMENT


WHY MUNTERS INDIRECT EVAPORATIVE COOLERS USE POLYMER TUBE HEAT EXCHANGERS


Munters’ EPX uses a corrosion-resistant polymer heat exchanger to produce dry, cool air without refrigeration. The heat exchange core incorporates unique, horizontal polymer tubes. Here is the evolution of the Munters Polymer Tube heat exchanger


ALUMINUM HEAT EXCHANGERS Munters began building indirect evaporative coolers (IEC) in 1978. At that time, Munters sprayed water onto the exhaust side of epoxy-coated aluminum plate heat exchangers. While the approach worked, the units did not hold up well to mineral scale build-up on the plates and corrosion formed on the aluminum surfaces in areas where the epoxy coating eventually wore off. Over time, it became impossible to prevent water from leaking from the scavenger to the process air stream.


POLYMER TUBE In 1997, Munters developed a polymer tube heat exchanger specifically to solve the issues with the other types of IEC systems. The new heat exchanger is called the EPX (evaporative polymer exchanger). Over the years, we refined the tube profile, the orientation of the tubes, materials of construction, and headers that the tubes were seated into. Today, the patented design uses tubes that are elliptical in shape, inserted into tube sheets constructed of 304 stainless steel, and sealed with a proprietary sealant selected for excellent adhesion and flexibility, resulting in a heat exchanger that is optimised for heat transfer, corrosion resistance and low air pressure drop. The EPX has another very beneficial


characteristic; the ability to shed mineral scale from the scavenger side heat exchanger surfaces. Because of the tube flexibility and ribbed exterior of the polymer, any scale that accumulates on the tube surface eventually detaches and falls away. We call this effect scale limiting.


TESTING The EPX has been extensively tested: 1. Thermal cycling testing where the heat


S10 FEBRUARY 2019 | ELECTRICAL ENGINEERING


exchanger was subjected to -30°F, followed by +130°F, then back to -30°F, 2. Air pressure drop testing vs. airflow on


both process and scavenger sides of heat exchanger, 3. Thermal performance under a wide


variety of process and scavenger air operating dry bulb and wet bulb conditions. Today Munters has an extensive


installation base of data centre cooling systems using EPX . We delivered the first data centre cooling systems using EPX in early 2011. The units were installed in Las Vegas, NV, which is an area known for very hard water, and these units are still operating without issue. Using the EPX across Europe, APAC and the Americas, Munters has arrived at the current design, after 40 years of IEC experience and design improvements along the way. When comparing IEC designs, we


encourage engineers and owners to do their due diligence. At a minimum, ask for references (specifically customers with at least three to five years of experience with the proposed cooling technology) and a list of data centre installations using the


technology. Ideally, an equipment installation should be visited to validate the vendor’s product quality, service, customer satisfaction, and overall technical cooling solution. Decisions made on lowest first cost, without vendor and design validation, are often the decisions later regretted. Indirect evaporative cooling cools air


without added humidity. By using a cross fluted heat exchanger, the water never comes in contact with the air. Using indirect evaporative cooling for the first stage of cooling makeup air reduces energy costs. The second stage is handled by conventional air conditioning where needed. The use of an indirect evaporative cooling system off sets cooling loads and significantly reduces energy consumption during peak design conditions. Munters Oasis IEC Indirect Evaporative Cooling uses a corrosion-resistant polymer heat exchanger to produce dry, cool air without refrigeration. The heat exchanger core incorporates unique, horizontal polymer tubes. Water flows down over the tubes as air is blown through the tubes in a counter direction. This air may be scavenger ambient-air or exhaust air from the space. When exhaust air is routed through the EPX, the system becomes even more efficient as it recovers the cooling energy from the space. In the winter months, the EPX can recover heat exhausted from the space. Air supplied to the space flows through the tubes and is sensibly cooled - no moisture added. In many cases, on a design summer dry bulb day, the EPX can lower the incoming air temperature by 30°F or more. In the winter months, the EPX can recover 50 per cent of the heat exhausted from the space.


Munters munters.com/datacentres / ELECTRICALENGINEERING


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