In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230°C as a saturated liquid at a rate of 45 kg/s. The steam resulting from the flashing process enters a turbine and leaves at 20 kPa with a moisture content of 5 percent. Use data from the tables. Plash chamber Separator
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- 1. A. Using the Steam Tables, determine the amount of cooling water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47 % moisture , mass flow rate = 7200 + (SN/X) kg/hr. Cooling water enters the condenser at 12 deg C and leaves at 21 deg C. Answer: B. Draw the schematic diagram of the condenser and process in the PV ahd TS diagrams below. Cp H2O = 4.187 KJ/(kg-K): Schematic diagram of heat exchanger =condenser1. A. Using the Steam Tables, determine the amount of cooling water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47 % moisture, mass flow rate= 7200+ (X/SN) kg/hr. Cooling water enters the condenser at 12 deg C and leaves at 21 deg C. Answer: B. Draw the schematic diagram of the condenser and process in the PV and TS diagrams below. Cp H20 = 4.187 KJ/(kg-K): Schematic diagram of heat exchanger =condenser S 2. Use only the MD below to solve this Item; use it by plotting data and process to determine items being asked. Steam enters a turbine at 117.4308 atmgage and 932 deg. F, and expands isentropicaly to 177.17 inches of Hg. For 2 + (X/SN) kg/sec of steam, what is (a) the ideal work done (KI/sec) if AKE = 0 and actual exhaust enthalpy is 2700 KI/kg. a)Ans: (b)ne =_ (c)Determine: (e) Actual steam temp ideal steam moisture at exhaust. Ans: at the exhaust. Ans. g) change in entropy during the actual process. Ans 3000 2500 2000…1. A. Using the Steam Tables, determine the amount of cooling water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47 % moisture, mass flow rate = 7200 + (10/13) kg/hr. Cooling water enters the condenser at 12 deg Cand leaves at 21 deg C. Answer: diagrams below. Cp H20 = 4.187 KJ/kg-K): Schematic diagram of heat exchanger =condenser B. Draw the schematic diagram of the condenser and process in the PV and TS V 2. Use only the MD below to solve this Item; use it by plotting data and process to determine items being asked. Steam enters a turbine at 117.4308 atmgage and 932 deg. F, and expands isentropicaly to 177.17 inches of Hg. For 2 + (10/13 kg/sec of steam, what is (a) the ideal work done (KJ/sec) if AKE = 0 and actual exhaust enthalpy is 2700 KJ/kg. a)Ans: (b)ne =. (c]Determine: ideal steam moisture at exhaust. Ans: (d) Actual steam quality at exhaust Ans: (e) Actual steam temp g) change in entropy during the actual process. at the…
- 1 Photos , 1/1 12:26 PM O 19% I An air cycle refrigeration plant operates with a centrifugal compressor and an air turbine mounted coaxially such that the power output from the turbine contributes to the power required to drive the compressor. The temperature of the air at the compressor inlet is 15'C and the pressure ratio is 2.5. The air during its passage from the compressor to the turbine passes through an intercooler and enters the turbine at 40°C. The cold space temperature is required to be ma intained at 15°C. Taking the isentropic efficiency of both compressor and turbine to be 84% and the mechanical efficiency of the turbine- compressor drive as 90%, calculate the following: Refrigerating effect Mass flow rate per kilowatt of refrigeration capacity Driving power required per kilowatt of refrigeration capacity. i. ii. ii.Consider an ideal Hampson-Linde cycle in which no heat is lost to the environment. Use the data in attached Table to calculate the fraction of nitrogen liquefied on each pass through a Hampson-Linde cycle operating between 1 bar and 100 bars, with an input temperature of 300 K. Assume that the heat exchanger works perfectly, so the temperature of the low pressure gas coming out of it is the same as the temperature of the high-pressure gas going in. Repeat the calculation for an input temperature of 200 K.A. Using the steam tables, determine the amount of coolimg water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47% moisture, mass flow rate= 7200 + (100 (value of x) /25 (value of SN)) kg/hr. Cooling water enters the condenser at 12 deg C and leaves at 21 deg C. Answer: ___ B. Draw the schematic diagram if the condeser and process in the PV and TS diagram. Cp H2O= 4.187 KJ/(kg-K) The value 100/25 signify X/SN
- QI) Steam is supplied to a turbine at 30 bar and 350 ° C. The turbine exhaust pressure is 0.08 bar. The main condensate is heated regeneratively in two stages by steam bled from the turbine at 5 bar and 1.0 bar respectively. Calculate masses of steam bled off at each pressure per kg of steam entering the turbine and the theoretical thermal efficiency of the cycleQ1) Steam is supplied to a turbine at 30 bar and 350°C. The turbine exhaust pressure is 0.08 bar. The main condensate is heated regeneratively in two stages by steam bled from the turbine at 5 bar and 1.0 bar respectively. Calculate masses of steam bled off at each pressure per kg of steam entering the turbine and the theoretical thermal efficiency of the сycle. 1 kg Turbine 1- m- m2 O 1-m, m,- m. Condenser m,. h, m2. 1 kg www kg Drain cooler m2 Heater-1 + (Н.Р.) Heater-2 (LP.)27. In a gas turbine plant air at 10°C and 1.01 bar is compressed through a pressure ratio of 4 :1. In a heat exchanger and combustion chamber the air is heated to 700°C while its pressure drops 0.14 bar. After expansion through the turbine the air passes through a heat exchanger which cools the air through 75% of maximum range possible, while the pressure drops 0.14 bar, and the air is finally exhausted to atmosphere. The isentropic efficiency of the compressor is 0.80 and that of turbine 0.85. Calculate the efficiency of the plant. (Ans. 22.76%)
- Evaporative cooling 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. In the diagram above 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 ft^3/min. Problem #1: Assume that the exit temperature is T2 = 90 °F. For this model of the system and from thedata provided determine:a) The mass flow rate dry air through the system (lbm/sec).b) The rate of heat that is output from the R-134a condenser Qout…QUESTION 14 An industrial refrigeratot uses (NH3) Ammonia, and a reciprocating compressor. At the begining of compression the refrigerant is dry staurated at 1bar and operates adibatically with index 1.3 and copression ratio 20. At the final stage, the fluid is saturated vapour. Using the prescribed property table, the specific volume after compression is (to 4 d.p) in (unit symbol). The volumetric ratio is (to 4.d.p) and the final specific volume is (to 2 d.p.). The work done on the refrigerant during the process is (to 1 d.p in kilo of unit symbol). The initial specific enthalpy of dry saturated (2 d.p) in (kilo of unit symbol), while that refrigrant is of after compression is (1 d.p) in (kilo of unit symbol) and the initial specific internal energy of dry saturated refrigrant is (2 d.p) in (kilo of unit symbol) then (3 d.p) in (kilo of unit symbol) after compression. The heat transferd per unit mass to the or from the the cylinder walls during the process is (to 2 d.p. in kilo of…Steam enters the turbine of a vapor power plant at 600 lbf/in.², 700°F and exits as a two-phase liquid-vapor mixture at 100°F. Condensate exits the condenser at 95°F and is pumped to 600 lbf/in.2 The turbine and pump isentropic efficiencies are 90 and 80%, respectively. The net power developed is 1 MW. Determine: (a) the percent steam quality at the turbine exit. (b) the percent thermal efficiency. (c) the steam mass flow rate, in lb/h.