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Previously, selecting this overlay would lock the date range to a single day. Updated the Show Daily Outline overlay so that it shows hourly data points averaged over the current date
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Hourly values over the currently selected period. The displayed points then show the average Off, the data values shown in the top-left of the chart are also hidden. This is the smallĬursor that you can interactively drag around the chart to show the psychrometric conditions at that point. Adjusting the padding around the chart.Īdded a checkbox in the PROCESS LINES panel to toggle the position indicator on and off. In addition to the bioclimatic chart, you can also overlay the Heat Index, Predicted Mean Vote (PMV), ASHRAE Standard 55 comfort classes and EN-15251 comfort categories, as shown in Figure 8.įigure 10f. However as one of my aims with this tool is to highlight the differences between using relative and absolute humidity, I would argue that it is a widely used term that, as long as the units being used to measure it are clearly displayed, is sufficiently well understood to warrant its use as a lexical counterpoint to relative humidity. I understand that humidity ratio is probably a more technically correct definition as some argue that absolute humidity is too general as it could potentially be used to cover a range of measures, humidity ratio and vapour pressure included as they are both absolute measures of humidity. Absolute Humidity vs Humidity RatioĪt this point it is probably worth noting the issues associated with using the term absolute humidity to describe the vertical axis.
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The hope was that by simply animating back and forth between the two chart types, most of that explanation would become pretty obvious as you get to see clearly almost all of the psychrometric processes change from straight lines under the absolute humidity axis to complex curvilinear lines under relative humidity.Ī by-product of this transition is that bioclimatic regions, when viewed against relative humidity, become a reasonably recognisable 90° rotated version of the original Olgyay bioclimatic chart, which helps in understanding the contribution of Givoni and Milne. Thus, one of the reasons for developing this tool was to see if I could morph seamlessly between the standard psychrometric chart and the much simpler relative humidity chart. Having previously taught psychrometrics to architects, I always found it challenging to convincingly explain why the psychrometric chart used humidity ratio or absolute humidity in the vertical axis instead of the more familiar metric of relative humidity, and why it was so important to understand the various metric lines. Note: Outer coefficient of heat transfer usually 3~10, >10 when winds.Figure 7b: This can also be done in the relative humidity chart and mapping the same data. Calculate duct flow resistance, environmental heat exchange, and adiabatic effect. Calculate air/liquid and round/rectangle cross section duct Ģ. Chart can be easily printed, copied to clipboard as bmp and wmf format, and exported as bmp, jpg, wmf or emf format.ġ. Chart plot/display setup and management support ġ2. Point state convert calculating, and give warning and error message, output point information if point state is OK ġ1. Convenient interface for process and mix point calculating ġ0. Many process point managements, include point pick up, data input grid, point definition select, point add, insert, reduce, delete, move up and down, open and save point list Ĩ. Chart grid snap, aided constant parameter lines across cursor point, middle button pan and mouse wheel zoom for convenient chart operating ħ. Normal and eastern(China) style support Ħ. Mouse point catch, snap and calculation, output point information and many air properties ĥ. Draw protractor for enthalpy-humidity and sensible-total heat ratio Ĥ.
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Dry bulb temperature and humidity ratio axis range can be changed easily, the chart generation is automatic and fast ģ. Use IAPWS-IF97 equation for water/vapor properties calculating, and treat moist air as real gas for high precision Ģ. Save and load data function for each data input grid, all input data can be saved for loading next time program started.ġ. This psychrometric chart use ASHRAE equations at normal temperature and pressure region and is perfectly consistent with all ASHRAE charts of No.1~7(SI Units) and No.1~5(IP Units).īoth Metric(SI) and English(IP) units support. A convenient, precise and powerful tool for HVAC&R engineers.