Chilled Water Coils Tag

Hot Water Coil

The HVAC industry has many manufacturers of units that all have heating and/or cooling coils as an integral part of their package. There are also many free-standing coils in large built up systems and some are mounted in duct runs from a central station unit. What they all have in common is the presumption that all the coils will meet the designated performance. They do...

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Condenser

  Almost all packaged A/C or split system units do not have a service factor for extra capacity. Even when new, these units may not yield the cooling BTUH capacity specified due to improper installation and/or incorrect load calculations at the inception of installation and startup. Consequently, as the system gets older and parts become less efficient, the system may lower its capacity to the point...

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It’s often difficult to understand circuitry on a chilled water coil. Changes to the “circuitry” and changes to the “tube diameter” will affect the overall capacity and pressure drops. Each time you change the circuitry on a coil selection, you have a positive, which relates to a higher capacity or lower fluid side pressure drop. The negative is either a lower capacity or a higher...

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Outside Air Loads

HVAC and process heating/cooling must deal with the added tonnage created by using fresh air from outside. Most times, the requirement for fresh air is mandatory and can go from 10% all the way to 100 % of the system air flow. There are numerous rules and regulations written to eliminate air flow quality problems, including bacteria and other micro-organisms, that can cause health problems....

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In a perfect world, most cooling coils should operate efficiently for twenty years or more. Lack of proper maintenance, inappropriate applications, corrosion, and less-than-stellar modern-day construction all affect the life expectancy of cooling coils. There are three major reasons for premature cooling coil replacement as follows:   Increased air resistance due to the plugging of the coil surface. What causes this plugging? There is an increase...

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Hot Water Coil

Water Cooling and Heating Coils   Water is the most widely used heat transfer medium because it’s readily available and low in cost. Water can be used as a heat transfer medium if the temperature range is between 15 degrees Fahrenheit (when mixed with glycol) when cooling and a high of 210 degrees Fahrenheit when heating.   Chilled Water Coils   When maintaining an acceptable living or working condition in...

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