EXPERIMENTAL 3

1. Steam humidification-switch all water heaters to boil the water. When steam is produced, switch only 3 kW of heat to maintain the steam. Print the data and chart when the conditions are stable. Then, calculate the amount of steam introduced, the change in relative humidity, and the corresponding rise of temperature

 

 

 

 

 

 

 

 

 

 

                            Schematic diagram                          psychrometric chart

 

   Steam Humidification

 

 

 

 

 

 

 

                                    TAd = 30.2                                   TBd = 35

To value Ø, ω, extend the psychrometric chart to find the value

                                    TAw = 26.4                                  TBw = 35

 

 

 

            From Psychrometric Chart         

                        ω₁ = 20.5 x 10^-3                                      ω₂ = 36.85 x 10^-3

                                Ø₁=  25%                                                Ø₂=  93.4%

 

1)      amount of steam = m_v2 – m_v1  

                                  = ( w₂ • m_a ) – (w₁ • m_a) 

                                  = ( 36.85 • 94.1) x 10^-3 – ( 20.5 • 94.1) x 10^-3   

                                  = 3.468 – 1.9291

                                  = 1.539 kg

 

2)      ∆ Ø = Ø₂ – Ø₁  = 93.4 – 75

                                = 18.4%

 

3)      ∆Tdry = 35 – 30.2 = 4.8 ^oC

      ∆Twet = 35 – 26.4 = 8.6 ^oC