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Chilled Water Coils Tag

Steam Distributing Coil
15 Sep

What is Heat Transfer?

by USA Coil
in all, Hot Water Booster Coils, Hot Water Coils, Indoor, Limited Access, Uncategorized
Comments

There are many terms used in the HVAC Industry. One that is often misunderstood is heat transfer. Wikipedia’s definition states that heat transfer is a thermal engineering discipline that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. It affects the measurement of heat.   The various heat transfer types are thermal conduction, thermal convection, thermal radiation, and the transfer of energy...

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Hot Water Coil
30 Oct

Can You Count on Coil Performance Expectations?

by USA Coil
in all, Booster Coils, Chilled Water Coils, Condenser Coil, Evaporator Coils, Hot Water Booster Coils, Hot Water Coils, Indoor, Limited Access, Uncategorized
Comments

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
18 Sep

Are Coils the Culprit Behind Decreased A/C Unit Cooling?

by USA Coil
in all, Booster Coils, Chilled Water Coils, Condenser Coil, Evaporator Coils, Hot Water Coils, Limited Access
Comments

  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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13 Mar

Capacity Changes

by USA Coil
in all, Chilled Water Coils, Indoor, Limited Access, Uncategorized
Comments

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
06 Feb

The Effects of Coil Selection with Outside Air Loads

by USA Coil
in Air Handlers, all, Central Station Units, Condenser Coil, Evaporator Coils, Fan Coil Units, Heat Exchangers, Hot Water Booster Coils, Hot Water Coils, Indoor, Limited Access, Sectional Coils, Uncategorized
Comments

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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23 Jan

Why Cooling Coils Need to be Replaced

by USA Coil
in all, Corrosion, Indoor, Limited Access, Uncategorized
Comments

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
09 Jan

Water Cooling and Heating Coils

by USA Coil
in all, Hot Water Booster Coils, Hot Water Coils, Indoor, Limited Access
Comments

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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