R11 R12 R22 P-h charts PDF

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Can be used as a reference for calculating refrigerant properties....

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REFRIGERATION & AIR CONDITIONING ASSIGNMENT BY 17ME66 Calculations of QL, QH, Win, COP and Inlet Density at Compressor: 1. For R11: PH DIAGRAM AND SOLUTION:

h1 = 405 kJ/Kg; h2 = 437 kJ/Kg; h3 =h4 = 290 kJ/Kg 𝑄𝐿 = 𝑚 󰇗 (ℎ1 − ℎ4 ) = 0.05 (405 – 290) = 5.75 kW 𝑄𝐻 = 𝑚 󰇗 (ℎ2 − ℎ3 ) = 0.05 (437 – 290) = 7.35 kW 𝑊𝑖 = 𝑚󰇗 (ℎ2 − ℎ1 ) = 0.05 (437 – 405) = 1.6 kW 𝐶𝑂𝑃 =

𝑄𝐿 𝑊𝑖

=

5.75 1.6

= 3.593

2.

For R12:

PH DIAGRAM AND SOLUTION:

h1 = 342 kJ/Kg; h2 = 377 kJ/Kg; h3 =h4 = 231 kJ/Kg 𝑄𝐿 = 𝑚 󰇗 (ℎ1 − ℎ4 ) = 0.05 (342 – 231) = 5.55 kW 𝑄𝐻 = 𝑚 󰇗 (ℎ2 − ℎ3 ) = 0.05 (377 – 231) = 7.3 kW 𝑊𝑖 = 𝑚󰇗 (ℎ2 − ℎ1 ) = 0.05 (377 – 342) = 1.75 kW 𝐶𝑂𝑃 =

𝑄𝐿 𝑊𝑖

=

5.55 1.75

= 3.172

3. For R22: PH DIAGRAM AND SOLUTION:

h1 = 392 kJ/Kg; h2 = 445 kJ/Kg; h3 =h4 = 220 kJ/Kg 𝑄𝐿 = 𝑚 󰇗 (ℎ1 − ℎ4 ) = 0.05 (392 – 220) = 8.6 kW 𝑄𝐻 = 𝑚 󰇗 (ℎ2 − ℎ3 ) = 0.05 (445 – 220) = 11.25 kW 𝑊𝑖 = 𝑚󰇗 (ℎ2 − ℎ1 ) = 0.05 (445 – 392) = 2.65 kW 𝐶𝑂𝑃 =

𝑄𝐿 𝑊𝑖

=

8.6 2.65

= 3.245

TABULAR DATA: QL (kW) QH (kW) Win (kW) COP Density at inlet of compressor; state 1 (Kg/m3)

R11 5.75 7.35 1.6 3.593 8

R12 5.55 7.3 1.75 3.172 8.3

R22 8.6 11.25 2.65 3.245 7...