CTI Bibliography of Technical Papers - HVAC Applications

Revised 2009

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HVAC Applications
Order NumberTitleAuthorDate
The Determination of the Effectiveness of the Coolpuck in the Mitigation of Biofilms in HVAC-Utilities Shawn H. Glinter and Jan De Rijk, Aquafinesse Industrial water 2009
Abstract: The company Special Water Europe BV and the KEMA Institute set out to test the effectiveness of the additive the Cool Puck in its laboratory using a small scale test assembly based on the Dutch Standard for assessing the performance of treatment programs for open re-circulating cooling tower water systems. The Cool Puck product is a man made and environmental friendly dispersant, which implies that the product itself has no microbial biocide effect. However, when applying the Cool Puck as a single product in a cooling tower system, organic compounds and microbes from the water phase showed visible precipitation in parts of the recirculation system. During the test batch Na-hypochlorite dosing was unable to mitigate the biofilm significantly, however with the addition of the Cool Puck approximately 24 hours before biocide dosing, the mitigation effectiveness increased significantly. By using the Cool Puck product as an additive to traditional biocide treatment the mitigation and prevention of biofilms was concluded in an industrial cooling tower system.
Optimization of Water Cooled Chiller - Cooling Tower Combinations James W. Furlong and Frank T. Morrison, Baltimore Aircoil Company 2005
Abstract: Water cooled chiller systems have typically been designed around entering condenser water temperatures of 85°F with nominal condenser water flow of 3 GPM/ton and a 10°F range. In recent years there has been considerable debate on the merits of designing around lower nominal condenser water flow rates with a higher range in order to improve system lifecycle costs. However, two other parameters must also be considered in any analysis - approach and design wet bulb. The question to be answered is: What nominal condenser water flow rate and approach is best from a first cost standpoint as well as from full load energy standpoint at any given wet bulb? A study was recently completed in an effort to answer this question using actual first cost and full load performance data from a variety of chiller, cooling tower, and pump manufacturers for nominal 500 ton water cooled, centrifugal chiller system. This paper reports on the findings from that study.


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