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The LiBr-water absorption cycle shown in Fig. 17-2 operates at the following temperatures: generator, 100°C; condenser, 55°C; evaporator, 10°C, and absorber, 30°C. The flow rate of solution delivered by the pump is 0.4 kg/s.
What is the concentration of Li-Br in the generator?
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- The LiBr-water absorption cycle shown in Fig. 17-2 operates at the following temperatures: generator, 100°C; condenser, 55°C; evaporator, 10°C, and absorber, 30°C. The flow rate of solution delivered by the pump is 0.4 kg/s. What is the mass flow rate of refrigerant?I. Condensing temperature = 40 C II. Evaporating temperature = 5 C III. Temperature of solution entering generator = 80 C IV. Temperature of solution leaving generator = 100 C V. Assume saturated conditions for states 3, 4, 8, and 10. VI. Saturated steam at 0.2 MPa enters the generator and leaves as saturate water: Compute: a. the required mass flow rate of the steam (kg/hr) per kW of refrigeration produced b. the Heat Rejection Ratio, HRR = (Qabsorber + Qcondenser)/Qevaporator of the system.The pressure at which the steam should be reheated.Notes: Assume the steam is reheated to the inlet temperature of the high-pressure turbine. The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 9.5%
- Find the following: a. Enthalpy of the steam in kJ/kg entering the condenser b. Enthalpy in kJ/kg of the condensate c. Enthalpy in kJ/kg of the feed waterIn a basic LiBr-water machine, the generator operates at 170 F while the evaporator is at 47 F. the absorbing temperature is 75 F and the condensing temperature is 88 F. Compute the HRR for these conditions.O Falge QUESTION 2 The refrigerant undergoes a change of phase during the heat-transfer process, the pressure of the retrigerant is the saturation pressure during the low supply and low rejection processes. True False QUESTION 3 Frequently, the vapor of the liquid leaving the condenser is lower than the saturation temperature. O True False QUESTION & The pressure of the iquid leaveng the condenser we be less than the pressure of the vapor entarng, wd etempernd the retigerant in the condenser. O Te QUESTION S Are many situations in which it is desirable to combine three cycles in series, either power systems or refigertion sytems, to take advantage of a very wide temperature range or to utilize what would otherwise be waste heat to improve etficiency O true O False QUESTION 6 A cycle can't be made very efficient, since the temperature differences between the two fluid streams can be controlled through careful design of the combined system. True
- A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH. Condensation occurs at 399.967 millibars vac. All expansion and compression efficiencies are 90 %. Sketch the equipment layout and the TS diagram. Answer the following for (m = 10 + (SN/5) ) kg/sec of steam circulated and fill up the blanks in the items below: 1. TS diagram with the cycle showing correct location of points with respect to saturation dome line with ne and nc = 90%. 2. Actual heat rate in KJ/KW-hr Answer: _______________________ 3. Heat rejected at the condenser in KW (Ideal) Answer: _____________________ 4. Ideal Rankine engine efficiency % Answer: _______________________ 5. Ideal Rankine cycle efficiency % Answer: _______________________ 6. Actual Rankine cycle efficiency using pump and turbine work % Answer: _______________ 7. Actual Rankine cycle efficiency using Qa and Qr values % Answer: _______________ 8. If the generator efficiency = 95%, brake engine efficiency = 90% what is…Steam is to be condensed by direct injection of cold water. The steam enters the condenser at the rate of (450 kg/hr) with dryness fraction of (0.9) and pressure (1 bar). The estimated heat losses from the condenser to the surroundings is (8500 kJ/hr). If cold water enters at (15"C) and the mixture of condensate and cooling water is to leave at (95"C). Determine the required flow of cooling water.1 atm steam (sat.) preheats CO2. If 2.26 MJ heat is released from 1kg of condensing steam, How much saturated steam is needed to condense to that 21 kg/s CO2is preheated from 303.15 K to 353.15 K? Cp CO2 = 4.5R, where R = 8.314 J/mol K. a. 0.40 kg/s b. 0.36 kg/s c. 0.30 kg/s d. 0.18 kg/s
- PLEASE DO NOT USE PSYCHROMETRIC CHART. THANK YOU In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min. Problem #2: Assume that the R134a chiller is turned off such that Qout = 0, but the evaporative coolersystem continues to operate. Determine:a) The exit temperature, T2 (°F)b) The mass flow rate dry air through the system (lbm/sec).c) The rate of liquid water resupply required for continuous operation (lbm/hour).for R600a1) at 40oC what is the pressure of condensation?2) What is the absolute pressure and gauge pressure of -25’C evaporating refrigerant? 3) mollier diagram (including dryness)A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH. Condensation occurs at 399.967 millibars vac. All expansion and compression efficiencies are 90 %. Sketch the equipment layout and the TS diagram. Answer the following for (m = 10 + (SN/5) ) kg/sec of steam circulate and fill up the blanks in the items below: 1. TS diagram with the cycle showing correct location of points with respect to saturation dome line with ne and nc = 90%. 1. Ideal Rankine engine efficiency % Answer: _______________________ 2. Ideal Rankine cycle efficiency % Answer: _______________________ 3. Actual Rankine cycle efficiency using pump and turbine work % Answer: _______________ 7. Actual Rankine cycle efficiency using Qa and Qr values % Answer: _______________ 4. If the generator efficiency = 95%, brake engine efficiency = 90% what is the combined work in KW? Answer: ____________________ 5. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves…