If you include the external outdoor dry-bulb temperature and relative humidity as output variables, they will be automatically selected as the mapping axis, though you can select any other temperature or humidity based output using the Data Axis tab in the Select Display Metric dialog box. CSV file into the browser window containing this application. Either select the Load CSV… button or simply drag-and-drop the EnergyPlus generated. In addition to annual hourly weather data, you can also load and display the results of EnergyPlus calculations.This is calculated as a 30-day running mean using the methodology described in ASHRAE Standard 55. You can also choose to automatically track average mean outdoor air temperature based on loaded hourly weather data and the current date range. When overlaying the Givoni Bioclimatic Chart, you can adjust the average mean outdoor air temperature used to derive the comfort zone in order to investigate the effects of adaption.To display the Heat Index, Predicted Mean Vote (PMV), ASHRAE Standard 55comfort class or EU Standard 15251 comfort category, simple select the appropriate comfort indicator in the COMFORT OVERLAY panel. You can position the current indicator by pressing and dragging anywhere within the chart to see the relevant psychrometric values at that position, all listed in the top-left corner of the psychrometric chart.The following are some of the features of this app: Now, by simply animating back and forth between the two chart types, most of that explanation becomes pretty obvious as you get to see very clearly the majority of psychrometric processes change from straight lines under the absolute humidity axis to complex curvilinear lines under relative humidity.Ĭonstant volume systems Interesting Features
Having taught psychrometrics to architects in the past, we found that a major hurdle was trying to convincingly explain why the psychrometric chart uses absolute humidity in the vertical axis instead of the more familiar metric of relative humidity, and why its characteristic curved layout is so important. When developing this tool, we really wanted to be able to morph seamlessly between the standard psychrometic chart and the much simpler relative humidity chart. Whilst obviously important in the design of air-conditioning systems, these concepts are also fundamental to the understanding of many aspects of thermal comfort in buildings and the principles of climate-responsive design. The terms psychrometry and psychrometrics refer to the study of moist air and its thermodynamic properties. You can add or remove lines for a range of different metrics or highlight them individually to assist with dynamic explanations or presentations. The aim of this web app is to create an interactive psychrometric chart on which you can project a range of comfort metrics as well as mapping weather data or room air conditions calculated using EnergyPlus.
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