Page 178 - Low Temperature Energy Systems with Applications of Renewable Energy

168 Low-Temperature Energy Systems with Applications of Renewable Energy

Fig. 4.E1 Scheme and process in the H, x-diagram of the water-ammonia refrigeration unit.

Table 4.E1 Initial data.
Parameters Case A Case B [55]

Cooling capacity, Q 1000 kW 1000 kW

Brine temperature at evaporator inlet, t b.inlet 10 C 20 C

Brine temperature at evaporator outlet, t b.outlet 20 C 30 C

Cooling water inlet temperature, t c.w.inlet 20 C 20 C

Cooling water outlet temperature, t c.w.outlet 25 C 25 C

Heating steam temperature, t s 100 C 130 C
Pressure, P 100 kPa 275 kPa
Working fluid: ammonia
Absorbent: water

Accepted temperature differences, C:
5 3
Evaporator Dt ev
5 5
Sondenser Dt cond
5 5
Absorber Dt abs
10 6
Generator Dt gen
10 10
Cooler Dt 3-7
10 10
Heat of brine Dt 14-10
Reflux condenser Dt r.c. 15 15