EG 270 Quiz 3
1 kg of water at 1 bar is compressed at constant pressure in a piston-cylinder. The water starts as
a saturated vapour and is compressed until it is a saturated liquid. Determine the work (W) and
heat transfer (Q), in kJ.
𝑊 = 𝑃∆𝑉 = 100 𝑘𝑃𝑎 (0.0010410 − 1.869)𝑚3 = −187 𝑘𝐽
∆𝑈 = (417.36 − 2506.1)𝑘𝐽 = −2,088.74 𝑘𝐽
𝑄 = 𝑊 + ∆𝑈 = −187 − 2,088.74 𝑘𝐽 = −2,276 𝑘𝐽