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Reality checking rather than praying for good results.Ĭarbon footprint of the Industry and trajectory to 2050.Process control of aqueous tablet coating depends on a number of thermodynamic and psychrometric variables. How the Romans grew melons or was it cucumbers ?Įxpectation management in building design No plans for charge stations from local authorities. Recognising excellence among students, academics and educators.ĮV drivers lose out to Londoners says new evidence Winners at the APM Festival of Education and Research Latest snap analysis of construction industry performance. Mixed results for construction in January as approvals fall In a different world from when it was last revised in 2010.ĭebunking the misconceptions of electric panel heatingĪ users perspective from last winter, does it still ring true? Revised Building Regulations Part F, a reminder The Government restructureĪ successful attempt to progress to Net Zero? Raising the profiles of small, tranquil cemeteries as places to visit.Ī story of belated action in response to crisis. Help us maintain, grow and improve Designing Buildings. The state of moist air can be determined from any two of these properties, from which all other properties can then be determined.Ītmospheric pressure varies with altitude and so a number of psychrometric charts are available for different atmospheric pressures, however, for altitudes of less than 600m the sea- level psychrometric chart is often considered adequate. Humidity ratio: The dry-basis moisture content of air expressed as the weight of water vapour per unit weight of dry air.Dew point temperature: The highest temperature at which water vapour will condense.Specific volume: The volume of a unit weight of dry air.Relative humidity: The ratio of the actual vapour pressure relative to the vapour pressure of saturated air at the same temperature, expressed as a percentage.The rate of evaporation from the wet bulb, and so the temperature it records varies depending on the humidity of the air it is exposed to. Wet-bulb temperature: The temperature recorder by a thermometer that has its bulb wrapped in cloth and moistened with distilled water.Dry-bulb temperature: A measure of air temperature recorded by a thermometer exposed to the air but shielded from radiation and moisture.Typically, the properties represented on psychrometric charts are: This can be useful in the design of heating, ventilation and air-conditioning systems for buildings, and psychrometric charts often include a zone in the middle that represents the range of conditions that people find comfortable under different circumstances (such as summer and winter). They are often used to assess the properties of moist air. Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure.
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