In the first part of this The RH lines are the curves extending from the lower left to the upper right part of the psychrometric chart. All the properties of air indicated in the psychrometric chart are calculated at standard atmospheric pressure. The relative humidity line passing though this point indicates RH of 50%. I have been using this word over and over again every since I knew how to pronounce it. The psychometric chart can be used to find the resulting condition of the mixture. 5. They indicate the value in either m3/kg or ft3/lb.If any of the two values from DB, WB, DP temperature and the relative humidity are known, all other values can be easily found from the psychrometric chart, without having to carry out any calculations.Consider an example of air where the given values of DB and WB temperature are 78 degrees F and 65 degrees F respectively. All rights reserved. The extreme left curve along the shoe indicates RH of 100% and is also called the saturation curve because the condition of air along this line is fully saturated no matter what the DB and WB temperatures are. All the properties of air indicated in the psychrometric chart are calculated at standard atmospheric pressure.

It is indeed, a powerful tool. Use the vertical lines extending from this axis to trace the measurements throughout the chart. We notice from the development in Section a) that the equations relating relative and specific humidity, temperature (wet and dry bulb), pressure (air, vapor) and enthalpy are quite tedious and inconvenient. “Aaah”Air conditioners, as the name suggests, are used to condition air. You’ll get dry, cool air.This is achieved in air conditioners for heating (or famously known as heat pumps), by adding water vapour, after being heatedFresh air and re-circulated air mixing is very important in maintaining low operating cost of an air conditioner.You can still use the paper chart, with pencil and ruler – in case of power disruption.

All Rights Reserved. Various Lines and Curves in the Psychrometric Chart. For other pressures, relevant corrections have to be applied. The constant specific lines start from the saturation curve and drop down with the slight angle to the vertical lines. Data referencing made easy.Interpreting the air behaviour during these changes, is possible by plotting the data.Sensible cooling can only happen under condition that, the cooling coil's temperature, is The condition that has to be met is, there should be no This function is usually achieved by use of chemical agents, like Specific humidity will be reduced along the wet bulb temperature line, whilst dry bulb temperature will increase, as a result of Water will condensate, and drained off. It’s just so Before I get carried even more, let me take you through other, even more Ok, one final practice of the pronunciation. cooling with change in specific humidity, can be detected in psychrometric chart, by noticing reduction in dry bulb temperature, with reduction in specific humidity.. cooling and heating with change in specific humidity using conventional air conditioners. The constant enthalpy lines extend from the enthalpy scale down toward the right side of the chart. Adiabatic Mixing of Air Streams: Very often air having different conditions are mixed in the air conditioning system, such as the mixing of fresh air and return or re-circulated air before it enters the process plant. The enthalpy scale in the psychrometric chart is located outside the main body. Psychrometry. [1] X Research source Each labeled temperature will have one vertical line extending from the axis. The specific volume of this air is 13.7 ft3/lb and the enthalpy of air is 30 Btu/lb.If all the values are calculated manually using the formulae, it takes lots of time, but with a psychrometric chart these values can be found within seconds or minutes.With a psychrometric chart we can easily find out the present and the final condition of the air. Psychrometric Chart.

The psychrometric chart looks like a shoe.

These equipment will be used to Use of psychrometry and psychrometric chart is vital for designing and Putting these data into a set of table (similar to Roger & Mayhew’s However, the drawback is, air conditioner designers and contractors have to flip-and-flip-back the pages to get necessary data.A chart, named known as the psychrometric chart is formed, incorporating all six parameters.

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