EXPERIMENTAL 4

1. cooling and dehumidification- switch on the compressor of the refrigeration system. Cool the air until 18°C to 20°C (stable temperature), and then print the data and chart. Calculate the heat rate amount of moisture removed from the air.

 

 

 

 

 

 

 

 

 

 

                                Schematic diagram                          psychrometric chart  

Cooling and Dehumidification                                                                             w1= w2

 

 

 

 

 

 

 

                                    Tdry = 31.1                                                 Tdry = 19.9

                                   Twet = 25.8                                                  Twet = 18.9

            From Psychrometric Chart

                          ω₁ = 0.01925 kg/kga                                       ₃= 0.01336 kg/kga

                           Ø₁= 66%                                                      Ø₃= 92%

                           h₁ = 80                                   h₂= 74              h₃ = 54

 

 

Q_out = m_a( h₁- h₂) + m_fh_f

 

m_v2 =   ω₂ m_a = 0.01925( 91.7x 10^-3) = 1.765 x 10^-3

 

m_v3 =   ω₃ m_a = 0.01336( 91.7x 10^-3)= 1.225 x 10^-3

 

m_f = m_v2 – m_v1

        =  (1.765 – 1.225) x 10^-3   

        = 5.4 x 10 ^-4 

 

  h_f  =  h₂- h₃ = 74 – 54 =  20 kJ/kg

 

 

☼ Q_out = 91.7x 10^-3( 80 – 74) + (5.4 x 10 ^-4  )(20)

             = 0.561 kJ