- #1
A question from construction of psychrometric chart
- Thread starter mech-eng
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Discussion Overview
The discussion revolves around the construction and interpretation of a psychrometric chart, specifically focusing on the placement of wet-bulb temperature and its relationship to the saturation line at 100% relative humidity. Participants are exploring the implications of wet-bulb temperature readings and their representation on the chart.
Discussion Character
- Exploratory, Technical explanation, Conceptual clarification
Main Points Raised
- One participant questions the placement of a wet-bulb temperature of 69 degrees Celsius on the psychrometric chart and its relation to the saturation line at 100% relative humidity.
- Another participant notes that the diagonal lines on the chart represent constant wet-bulb temperatures, suggesting that the label indicates the line's temperature.
- A later post reiterates the initial question about the wet-bulb temperature, proposing that it might actually be 69 degrees Fahrenheit instead of Celsius, and discusses the relationship between wet-bulb and dry-bulb temperatures at different humidity levels.
- There is mention of wet-bulb depression occurring at humidity levels below 100%, indicating that moisture evaporation cools the bulb, which is relevant to the chart's plotting.
Areas of Agreement / Disagreement
Participants express uncertainty regarding the correct temperature scale (Celsius vs. Fahrenheit) and the implications of wet-bulb temperature placement on the psychrometric chart. Multiple competing views remain about the interpretation of the chart and the relationship between wet-bulb and dry-bulb temperatures.
Contextual Notes
There are limitations in the discussion regarding the clarity of the attached images and the assumptions made about temperature scales and humidity conditions. The relationship between wet-bulb temperature and the saturation line is not fully resolved.
- #2
SteamKing
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There's some sort of problem with the attachment.
- #3
russ_watters
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The diagonal lines are constant wet bulb: so that's the label of the line it is next to.
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jim hardy
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Isn't it 69 degF not C ?mech-eng said:
It'd be placed vertically above the 69 on horizontal axis
because
at 100% humidity , wet bulb and dry bulb are the same ? And at any other humidity there's wet bulb depression ?
Remember what's going on on that psychrometer - moisture is evaporating, cooling the bulb. They're plotting that depression.
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