HW5

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Thermodynamics (Carnot Cycle) An Ocean Thermal Energy Conversion (OTEC) power plant produces 25000 kW of ouput using warm surface water temperature of 29°C and a cold deep-water temperature of 12°C. Assume it is a carnot cycle and density of cold water to be 1000 kg/m3. Calculate the heat rejected in kW.    Options: a. 920000 b. 720000 c. 120000 d. 420000 e. 820000 f. 320000 g. 520000 h. 220000 i. 620000

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Problem An electric heater is to heat 18 kg of oil per min. from 24.5 °C to 185.5 °C. Specific heat of oil is 2.018 KJ/kg- °C.Calculate the power consumed by the heater. Ans. Problem The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 1350 W lamp for 45 minutes? 97.4694 Kw 18 %. 10250 KJ/kg must be consumed to light a Ans. 1.976 KJ

3. The working substance for a Carnot cycle is 8 Ib, of air. The volume at the beginning of isothermal expansion is 9 ftand the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 °F. Find: a) Q, and Qr (BTU), b) V, and Ps, c) V, and P4, d) mean effective pressure (psia).

Student N 440 "C and p 1.5 bar, T; 160 C. The mass fowrate is 60 kgs Conditions in the inlet and evt of a team turhine are measured as p a) Assume the turbine is well insulated such that he creanao crocess is adiabatic. Calculate e power developed by the turbine, kW. b) Estimate that heat transfer rate from the steam to the environment is 2.5% of the net actual power developed and calculate this power developed by the turbine under this assumpbion. Potential and kinetic energy effects can be ignored.

Thermodynamics (Carnot Cycle) An Ocean Thermal Energy Conversion (OTEC) power plant produces 25000 kW of ouput using warm surface water temperature of 29°C and a cold deep-water temperature of 12°C. Assume it is a carnot cycle and density of cold water to be 1000 kg/m3. Calculate the efficiency.    Options: a. 9.44% b. 3.68% c. 5.63% d. 58.62%

Q1/Refrigeration system uses Freon R-134a, evaporating temperature is (-10 C ), condensing temperature is (35 C) From, chart of R 134a, the properties h1 = 392 kJ / kg, h2 = 421 %3D kJ/ kg, h3 = h4 = h3 = 249 kJ/kg. A- Estimate coefficient of performance COP 1.22 4.93 O 6.72 O 2.26 O 7.55 O

Q.4/A combination of a heat engine driving a heat pump, the heat energy supplied to the heat engine is 5040 J, and the temperature of the hot reservoir Tmin is 30 °C and the thermal efficiency of the heat engine is 41%. The work energy W12 of heat engine goes to the heat pump that the coefficient of performance COPHP=1.3. Find: a) The Tmaxmax of the heat engine, b) The Tminmin of the heat pump, c) The work done between two engines d) Qrej of the heat pump T max 150 °C Qadd = 5040 J. W 12 Н.Е. Н.Р. Qrej 30 °C T min

3) The pump works (wbomba) and the turbine (wurbina). 4) The heats: boiler (QH) and condenser (QL). 5) The thermal efficiency of this cycle.

Q.4:A) A single-stage reciprocating compressor takes Ikg/min at 1bar, 288K and delivers it at 5bar calculate the indicated power required and isothermal efficiency, assuming that the law of compression and expansion is PV = C and that the clearance is negligible. B) A certain natural gas has the following volumetric analysis: 60% CH4, 13% H2, 18% CO, 6% CO, and 3% O2. This gas is burned completely with the stoichiometric amount of dry air. Determine the theoretical the air-fuel ratio and the mole fraction of each products.

Can you please help me with question 3

The motor of an electrical appliance consumes 18 000 J. during itsoperation, 9450 J dissipated in heat, 250 J were used forproduce light and 350 J are required to power the electronic panel ofdevice. What is the fuel efficiency of the engine of this device ?

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Present step by step solution. If EB in to be used, start in System Under Study, then, Fluid Under Study, and draw BED.

Sea water for cooling enters a condenser at 32℃ and leaves 42℃. The Condenser temperature 65℃, Calculate LMTD. ANSWER: 28℃

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8. The maximum fnermad efficiency possi ble for a power ycle operatng botween poF amd ezs"F IS !

PLEASE ANSWER ASAP A space is to be maintained at 22⁰C db , 30%RH during winter months. The sensible heat loss from the space is 146KW and the latent heat loss is 15KW. Assuming 20% by weight of the supplied air is fresh air and the temperature difference allowed for the supply air is about 14⁰C. Assume outside conditions to be 5C dry bulb and 20%RH Find (a) amount of supply air, m 3 /s, (b) Amount of water sprayed in the humidifier, Kg/s, (c) Heat supplied in the Heating equipment assuming no heat is removed from the humidifier, KW.

Q1:- In a R-134A based refrigeration system, a liquid-to-suction heat exchanger (LSHX) with an effectiveness of o.713 is used. The evaporating and condensing pressures are 1.4 bar and 6 bar respectively. Assuming the compression process to be isentropic, find: a) Volumetric refrigeration effect. b) COP of the system. c) Maximum temperature in the system

I need , RAy and RBy with complete solution. Thank you for helping.

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DEVICE is REFRIGERATION & 12 23 3 4 4 → 1 At 1. AT 2: AT 3 AT 4 : : ADIABATIC COMPRESSION COOL AT CONSTANT PRESSURE P1 = ADIABATIC EXPANSION HEATING AT CONSTANT PRESSURE P2 = P1 = A BAR P2 P3 3.2 BAR ASK: A) B) T2 c) HEAT 74 T1 HEAT CAPACITIE C 4 тн E SPECIFIC HEAT RATIO OF WORKING Y = 1.5 T3 = EXCHANGE S UNDERGOES REVERSE BRAYTON CYCLE -5.15e MABS OF WORKI G SUBSTANCE M = 116g 17.85°C SUBSTANCE cu & Cp iN CELCIUS Q23 IN s/g & Q41 is IDEA

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Steam enters a turbine at 600 ᵒC at 7300kPa pressure and leaves the turbine as saturated steam at 75 kPa.. Turbine inlet diameter is 50 mm and outlet diameter is 300 mm. In case the velocity at the turbine inlet is 200 m / sFind the turbine output power a) find the heat transfer, ignoring kinetic and potential energy changes. B) kineticsExplain by calculating whether the energy change is negligible.

Write legibly, provide manual step by step solution, and diagram for below given problem. Steam enters a turbine at 1.4 Mpa and 320. The turbine internal efficiency is 70%, and the total requirement is 800 kw. The exhaust is to the back pressure system, maintains at 175kpa. Find the stean flow rate. a. 2.62 kg/s    c. 3.23 kg/sb. 4.23 kg/s   d. 5.34 kg/s

The refrigeration system of a food production firm is run using the Reversed Carnot Cycle. The temperature of the hot refrigerant supply in the system should be 52°C, while the temperature of the sink should be -14°C. Its capacity is projected to be at least 24 tons. It's important not to disregard losses. Find and Show unit analysis and conversion: a. COP and COP of Heat Pump b. Heat rejected from the system in kW c. Network in, Hp and Energy Efficiency Ratio