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<span style="font-weight: bold;">HMX helps Al Waha tower reduce the chiller load.</span><br /> <br /> Al Waha Towers, a premium residential complex owned by the Al Batha Group in the UAE, reduced the load on its chiller by using HMX pre-cooling units to cool the make-up fresh air, resulting in reduced capex and opex.<br /> <br /> <span style="font-weight: bold;">Challenges</span><br /> Al Waha Towers, located in the severely hot climate of Sharjah, UAE, The Al Waha Towers are centrally air-conditioned. The central air-conditioning system covers all common areas, such as lobbies, corridors, and lift areas of the 44-floor building, while the residential areas have package air-conditioners of their own.<br /> <br /> The Al Batha Group found it difficult to maintain a constant comfortable temperature in the common areas of the building; temperatures in these areas were always 2-3<span class="st" data-hveid="46" data-ved="0ahUKEwi_soqN6_faAhVJQY8KHUhoAQAQ4EUILjAA">°</span>C higher than the required temperature. To overcome this challenge, the group looked at several solutions:<br /> <br /> <span style="font-weight: bold;">Addition of a chiller:</span> Adding a chiller to the existing system would make it possible to maintain the required temperatures inside the common areas. However, this would also mean significant capex and a higher opex.<br /> <br /> <span style="font-weight: bold;">Recovery of air through ERW: </span>Energy recovery wheels (ERWs) would take in the air from the conditioned space and circulate it back to the same space by recovering the heat energy. This would require additional ducting from the ground floor to the top floor where the ERW would be installed. Moreover, installing an ERW would also require significant capex and high opex.<br /> <br /> <span style="font-weight: bold;">Closing or reducing the make-up fresh air: </span>Al Waha tower had two Fresh Air handling Units (FAHUs) installed (capacity: 30,000 CFM each) to treat their 15 per cent make-up fresh air. The FAHU cooled and dehumidified the make-up fresh air from the ambient 50<span class="st" data-hveid="46" data-ved="0ahUKEwi_soqN6_faAhVJQY8KHUhoAQAQ4EUILjAA">°</span>C to 15<span class="st" data-hveid="46" data-ved="0ahUKEwi_soqN6_faAhVJQY8KHUhoAQAQ4EUILjAA">°</span>C. The FAHU tonnage consumption for this was 510 TR per hour. In spite of the fresh air quantity being only 15 per cent, the tonnage consumed was almost 30 per cent of the entire chiller load. This meant less available tonnage for cooling the recirculated air and therefore, inadequate cooling for the fresh air being supplied.<br /> <br /> <span style="font-weight: bold;">Solution</span><br /> The Al Batha Group searched for a solution that would help maintain their desired requirements in terms of temperature and an appropriate fresh air quantity without significant capex or opex and with minimal alteration to their existing systems. This was when they approached HMX for a solution.<br /> <br /> HMX retrofitted the two FAHUs with two HMX-PCUs of 30,000 CFM capacity each. The HMX-PCU is essentially an IEC-based (Indirect Evaporative Cooling) pre-cooling unit that cools the ambient air without the addition of any moisture. This is done with the help of water as the cooling media and without any dependency on the chiller system or on return air ducts.<br /> <br /> The HMX-PCU has a clear advantage over other technologies; it provides a host of benefits: Low capital investment; smaller footprint; reduced energy consumption; elimination of return air ducting; zero cross contamination; minimal maintenance; and better life-cycle.<br /> <br /> <span style="font-weight: bold;">Result</span><br /> The HMX-PCU helped reduce the enormous load on the chillers that was used to treat the make-up fresh air. With considerable tonnage now freed up, the air-conditioning system at Al Waha towers is efficiently cooling the common areas as desired.<br /> <br /> (Communication by the management of the company)<br />