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When air passes over a chilled water coil or a dry evaporator coil why does the relative humidity rise?
Wiki User
∙ 14y ago
Psychrometrics have a great role to play in this question. If you take entering air at any given condition meaning a wet bulb and dry bulb temperature and you plot the entering air temperatures on the psych chart you will notice that the air is cooled sensibly as well as latently. Latent meaning a change of state will occur (condensation). As the air continues to pass over the cooling coil not all the air comes in contact with the coil. This is referred to as bypass factor. That means that not all air is cooled sensibly or latently some just goes right through the coil. This air is introduced to a raised humidity due to water on the coil and some is reintroduced into the air stream. This air is warmer and warmer air can hold more moisture, hence re introduction of water back into the air stream. Or, slight rise in humidity. This is really of no consequence if the system is sized correctly and or the run-time is lengthened along with proper tonnage required to handle the sensible load. The air flow will also have a major role to play in the final outcome. Bruce Porter,Senior Application Engineer, York Johnson controls,Norman Oklahoma.
Wiki User
∙ 14y ago
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Dry expansion evaporator?
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