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Certain processes require a closed-loop, whereby
the process water for cooling does not come in
contact with the atmospheric air. This prevents
the cooling water from picking up particles that
may not get filtered or even dissolved gases.
Closed-loop cooling requires more energy and has
higher initial and life-cycle costs than an open cooling
tower, but provides an added protection to expensive
processes or chillers being cooled.
For closed-circuit cooling, Delta recommends a
cooling tower plus a plate heat exchanger system.
The skid-mounted plate heat exchanger provides a closed-
circuit on the hot side of the heat exchanger. The non-
corroding Delta cooling tower feeds the cold side of the
plate heat exchanger.
The advantages of this system over a closed-circuit cooling
tower (usually galvanized sheet steel and galvanized steel
coil inside a cooling tower box) are:
• Cost - Typically Costs Less to purchase & operate
• HP - Less Total HP required, Green solution
• ASHRAE 90.1 Performance requirements for heat
rejection equipment show closed-circuit cooling towers
use 2.5 x more HP
• Warranty - Delta cooling tower has 20-Year casing
warranty versus 1-Year on galvanized steel
• Expandability – Heat Exchanger can handle future
load increase by adding plates
• Maintenance – Heat Exchanger has Stainless Steel plates
and is much more accessible than coil for easy cleaning
• Weight – Delta tower is 3-7 times less weight saving rigging
and structure costs
• Install Flexibility - Heat Exchanger skid can be placed
indoors without need to maintain Glycol solutions
necessary with outdoor coil
• Water treatment - Easier and much less risk with
Engineered Plastic Cooling Tower
• Replacement Cost - Galvanized steel coil replacement
cost (labor and material) often exceeds initial unit cost of
Closed Circuit Cooling Tower
• Downtime – Delta system prevents costly downtime.
Corrosion is only delayed with galvanizing and wet/dry
operation, chemicals, PH fluctuations, salts and other
atmospheric conditions can lead to premature failure
Cooling Tower Heat Exchanger System vs. Closed Circuit Cooling Tower
Total HP
Materials
Costs
$38,520 (including
closed-circuit cooling
tower, basin heater,
spray pump and control
panel
$25,980 (including cooling
tower, basin heater, skid
mounted heat exchanger with
spray pump and control panel
Galvanized Steel HDPE Cooling Tower
Stainless Steel Exchanger
42 17.5
Cost for typical installation
Conditions: 330 GPM, 102°F EW, 90°F LW, 78°F WB
Closed-Circuit Cooling Tower Cooling Tower Heat Exchanger Sys.
Cooling tower heat exchanger systems beat closed-circuit cooling towers for economy and efficiency!
TThhee GGrreeeenneerr CClloosseedd--LLoooopp SSyysstteemm
Delta Cooling Towers, Inc.
Phone: 973-586-2201 – Fax: 973-586-2243
www.deltacooling.com

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Improved closed loop cooling arrangement

  • 1. Certain processes require a closed-loop, whereby the process water for cooling does not come in contact with the atmospheric air. This prevents the cooling water from picking up particles that may not get filtered or even dissolved gases. Closed-loop cooling requires more energy and has higher initial and life-cycle costs than an open cooling tower, but provides an added protection to expensive processes or chillers being cooled. For closed-circuit cooling, Delta recommends a cooling tower plus a plate heat exchanger system. The skid-mounted plate heat exchanger provides a closed- circuit on the hot side of the heat exchanger. The non- corroding Delta cooling tower feeds the cold side of the plate heat exchanger. The advantages of this system over a closed-circuit cooling tower (usually galvanized sheet steel and galvanized steel coil inside a cooling tower box) are: • Cost - Typically Costs Less to purchase & operate • HP - Less Total HP required, Green solution • ASHRAE 90.1 Performance requirements for heat rejection equipment show closed-circuit cooling towers use 2.5 x more HP • Warranty - Delta cooling tower has 20-Year casing warranty versus 1-Year on galvanized steel • Expandability – Heat Exchanger can handle future load increase by adding plates • Maintenance – Heat Exchanger has Stainless Steel plates and is much more accessible than coil for easy cleaning • Weight – Delta tower is 3-7 times less weight saving rigging and structure costs • Install Flexibility - Heat Exchanger skid can be placed indoors without need to maintain Glycol solutions necessary with outdoor coil • Water treatment - Easier and much less risk with Engineered Plastic Cooling Tower • Replacement Cost - Galvanized steel coil replacement cost (labor and material) often exceeds initial unit cost of Closed Circuit Cooling Tower • Downtime – Delta system prevents costly downtime. Corrosion is only delayed with galvanizing and wet/dry operation, chemicals, PH fluctuations, salts and other atmospheric conditions can lead to premature failure Cooling Tower Heat Exchanger System vs. Closed Circuit Cooling Tower Total HP Materials Costs $38,520 (including closed-circuit cooling tower, basin heater, spray pump and control panel $25,980 (including cooling tower, basin heater, skid mounted heat exchanger with spray pump and control panel Galvanized Steel HDPE Cooling Tower Stainless Steel Exchanger 42 17.5 Cost for typical installation Conditions: 330 GPM, 102°F EW, 90°F LW, 78°F WB Closed-Circuit Cooling Tower Cooling Tower Heat Exchanger Sys. Cooling tower heat exchanger systems beat closed-circuit cooling towers for economy and efficiency! TThhee GGrreeeenneerr CClloosseedd--LLoooopp SSyysstteemm Delta Cooling Towers, Inc. Phone: 973-586-2201 – Fax: 973-586-2243 www.deltacooling.com