Air enters a food dehydration system at condition 1 and exits at condition 2. What is...

Air enters a food dehydration system at condition 1 and exits at condition 2. What is the change in enthalpy (kJ/kg dry air) of the air as it passes through the system: Condition 1: Tdb = 30C; Twb = 15C. Condition 2: Tdb = 100C; Twb = 40C. Select the closest answer.

Solutions

Expert Solution

From Psychrometric chart

at DBT 30°C and WBT 15°C Enthalpy (h1) = 41.62 kJ/kg

at DBT 100°C and WBT 40°C Enthalpy (h2) = 161.66 kJ/kg

Change in enthalpy = h2 - h1 = 161.66 - 41.62 = 120.04 kJ/kg

Even you can calculate from Psychrometric Calculator

Link = https://www.kwangu.com/work/psychrometric.htm

or from psychrometric chart of high temprature

if you have any doubt please comment

samet mamat answered 1 year ago

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