Page 228 - Low Temperature Energy Systems with Applications of Renewable Energy

Fig. 5.36 Flow diagram of 2-stage HPU with an economizer EC. C, condenser; CM1, CM2,
compressors; EC, economizer; EV, evaporator; HS, consumer’s heating system; P1, circulation
pump; P2, well pump; PW, IW, production and injection wells, respectively; TV1, TV2,
throttles; WP, water purification system.

Table 5.7 Thermodynamic parameters of 2-stage HPU at T c ¼ 95 S. Cooling
capacity ¼ 66 kWt; Thermal power ¼ 95.1 kWt; CM1 ¼ 12.8 kW; CM2 ¼ 3.25 kW; CM1
eff. ¼ CM2 eff. ¼ 76.3%; EC ¼ 16 kWt; R123 flow rate in EV, _ m EV ¼ 0.542 kg=s, in C,
_ m C ¼ 0.655 kg=s; COP 2.27.
Parameters
3
Points P, MPa T, 8S V,dm /kg h, kJ/kg S, kJ/(kg K) x _ m i = _ m
1 0.076 27.00 206.26 399.58 1.6831 0.828
2 00 0.231 57.18 71.69 417.55 1.6831 0.828
2 0.231 64.39 73.78 423.14 1.6999 0.828
3 0.231 63.56 73.55 422.50 1.6980 1.000
4 00 0.702 98.69 24.25 441.50 1.6980 1.000
4 0.702 105.31 25.03 447.40 1.7137 1.000
5 00 0.702 95.00 23.79 438.19 1.6890 1.000
5 0.702 95.00 0.79 302.27 1.3198 1.000
6 0.702 95.00 0.79 302.27 1.3198 0.828
7 0.231 52.58 20.94 302.27 1.3293 0.290 0.172
8 0.231 59.58 72.39 419.41 1.6887 0.172
9 0.702 72.58 0.75 277.91 1.2522 0.828
10 0.076 20.00 65.73 277.91 1.2683 0.325 0.828
11 00 0.076 20.00 200.68 394.67 1.6666 0.828
11 0.076 27.00 206.26 399.58 1.6831 0.828