PARTNER FOCUSFANS
■ The installed chiller will not totally stop due to excessive high pressure; due to the 1.2°C warmer water the chiller will unload and capacity will suff er, however it will not fail. The fi nal result will be some loss of comfort, or in the case of industrial applications, some slowdown of the production process will take place.
■ In typical Mid-European climates there will be less than 100 hours when the wet bulb temperature is higher than 19.3°C spread over a few summer days.
The underperformance may seem slight. In fact, there may be several years of bad summers, where design water temperature conditions are never exceeded. But the true issue lies in the annual economic impact. By comparing Model A and Model B we see that the fan kWh requirement for Model A will be 27770 kWh and for Model B it will only be 25400 kWh, due to the smaller fan motor. However, Model A’s chiller uses 1,114,360 kWh, whereas Model B’s chiller needs 1,178,700 kWh—almost 6% more. Adding up the chiller and fan kWh, Model B requires 5% more electrical energy annually.
See table to the left. Note that energy prices have
fl uctuated wildly over the last couple of years. The increase kWh rate, at its peak in January 2023, would have seen a rate of €0.50/kWh = +€30,985 /annum! But it doesn’t end there. In addition to electrical costs,
there is more water consumption for Model B because the chiller has to work harder, hence more waste energy has to
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be dissipated and more water will evaporate. In our example, Model B will consume per annum 500m³ water more. If we take the very modest cost for water supply, sewage, and chemicals (€3.61/m³), this adds another €1,805 per year. See above chart.
Conclusion: overall costs The total additional annual operating cost for water
and electricity for the system with Model B is €14,199. This is around half the initial cost of the new cooling tower, and shows that the small installation price advantage is a false economy. Long term, Model A off ers a more energy effi cient, eff ective, reliable and cost friendly choice. Certifi ed thermal performance testing guarantees performance and removes both risk and guess work to obtain system economics.
Find certifi ed products Eurovent Certifi cation off ers free, 24/7 access to transparent
and accurate performance data through its online Certifi ed Product Directory. Use certifi ed data to compare products confi dently and make informed decisions. Search HVAC and refrigeration products by family, type, brand, model name, or certifi cate number. If a product isn’t listed, it isn’t certifi ed. Search the certifi ed product directory now.
www.eurovent-certifi
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www.acr-news.com • September 2024 17
Even the best designed
and installed systems will under- perform if real life product
performance does not match
manufacturer claims.
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