Chilled Water Cooling Coil Selection

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Chilled water cooling coil selection.

On a cooling coil air velocities above 500 fpm is the point where water droplets can leave the outer edge of the fin. The delta t was 10 degrees 54. Key decisions for coil selection dynamics of heat. Most chilled water coils have air entering the system at a temperature ranging from 75 f to 95 f return or outside air while chilled water enters the coil at a temperature around 42 45 f.

We design to avoid this. Whether it s a basic duct booster coil or a custom coil we can meet all of your specifications with accuracy ease and at a competitive price. Typical hot water coil 600 700 fpm. This is called moisture carry over.

Water coils need to be piped for counter flow with the return being on the entering air side of the coil and the supply being on the leaving air side of the coil. York offers a broad selection of high efficiency commercial hvac coils for hot water or steam heating and chilled water or direct expansion air conditioning. Chilled water coils typically consist of between 3 12 rows of tubes. We offer a complete line of hvac heating and cooling coils for all your replacement and new construction needs.

Chilled water cooling coil selection example 4 chilled water coil worksheet example 5 chilled water coil worksheet 6 enthalpy of air table 1 7 air density correction at altitude table 2 7 air density correction at temperature table 3 7 log mean temperature difference table 4 8 basic capacity figure 1 8fpi 9 basic capacity figure 2 1ofpi 10. Standard and custom designs are available for new and retrofit installations. For example it was once common for chilled water to be 44 f supply temperature and 54 f return temperature. In many cases higher delta t results in a higher average temperature of the chilled water as it goes through the cooling coil at your load.

Understand the balance of coil face area airside pressure drop and waterside pressure drop when selecting a coil 5. This allows the return water to temper the warmest entering air getting it closer to its set point prior to leaving the last row where it will see the coldest supply water temperature. In these cases the cooling coil cannot perform as much cooling. Evaluate water coil selection choices at various water temperatures and flow rates 4.

Cooling coils are an integral part of the chilled water system too. Coil performance can even influence the efficiency of the chiller. The extent to which coils raise the chilled water temperature dramatically affects both capital investment in chilled water piping and pumping power. Casing options include flanged slip and drive end plates only and inverted side plate flanges in galvanized stainless steel and copper materials.

Typical chilled water coil 500 fpm.