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Solved Problem 10.4: Theexperienced hvac technician has to estimate the heatincoming to his work site (1) Do Not impose any specifictemperature for the incoming air, and (2) Is the incoming dry air100%RH or less than 100% RH?The psychrometric chart helps in answering thisquestion. The psychrometric chart can be plotted bypassing the heat added as one input parameter (heatincoming=0 kJ/kg-dry-air) or passing the heatadded as 2nd input parameter alongwith the ambient temperature as the thirdparameter (heatadded,T,t); where T=Tincoming and t=temperature of the air comingfrom the outside.. The program plots the psychrometricchart using psychplotting.m. The computation for calculating theheatadded and heatremoved along with other relevantproperties suchas moisture and enthalpy are very simple. For example, itcan be simply inputted in the code:Psychrometricsnew('T',desired,ambient, graphical-data)Attributes:1. choosedetails2. M-file: Psychrometricsnew3. Plotoutput: Psychrometricallyplotted data4. Time taken for execution:28 secs5. User Inputs:1. assumedT=desired2. ambient(cooling):ambient_temperature6. graphical_data (Heating):heating_temperature7. graphical_data (Cooling):cooling_temperature8. graphical_data (Total):heating+ coolingExperienced HVAC technicians have to calculate andestimate the amount of heat removed using the psychrometricchart in order to keep the bureau dry and hygienic. Thecode is as follows.Psychrometricsnew('T',desired,ambient,chilled)This is the code to estimate the amount of energyrequired for chilling the air entering your office. Althougha dryer is not required in this example one has beenused to illustrate the role of psyhsrometrics.The ambient room temperatures are specified as 25°C, 32°, 35°,and 40°C. Zero degrees indicates that the air is notcold. The HVAC technician can also use the psychrometricchart to estimate the heat requirements to keep theoffice comfortable. Here, the ambient temperatureis 30°C, and the relative humidity is 50%. d2c66b5586
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