Chapter 5, Problem 5.86EP

Concentrating solar power plants are frequently located in desert areas where they can collect a lot of solar energy. If the power plant produces steam at a temperature of 1,016 oF and is cooled with ambient air at a temperature of 106 oF what is the maximum efficiency of the conversion of solar energy to electricity? Give your answer in percent (%).

A carnot heat pump is operating to keep a room at 20C. The unit is taking in air from a -30C location. If it is pulling 5kW from the -30C location, what is the power input required to do this and how much heat is delivered to the 20C room?

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

The cycle comes with a net power cycle of 25.40 kW. The heat that goes out is 42.30 kW. Find the efficiency of the cycle?

The thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to work as a heat pump with same operating conditions then what will be the COP for heat pump?

An electric power plant operating on the Carnot cycle puts heat into a river with a water temperature of (15 °C), what must be the maximum temperature that the working material puts forward in the plant to be efficient (40%), and if it is required to produce a capacity (20MW), what is the quantity rejected and Additive heat per unit time.

In a steam turbine steam at 2 MPa, 360°C is expanded to 8 kPa. It then enters a condenser, where it is condensed to saturated liquid water. The pump feeds back the water into the boiler. Assume ideal processes, find per kg of steam the net work and the cycle efficiency. 3(360°C) 2 MPa 8 kPa

10 0.9967. Ans. H.W 2 A smaller power plant produces steam at 3 MPa, 600 C, in the boiler. It keeps the condenser at 45 C by the transfer of 10MW out as heat transfer. The first turbine section expands to 500 kPa, and then flow is reheated followed by the expansion in the low-pressure turbine. Find the reheat temperature so that the turbine output is saturated vapor. For this reheat, find the total turbine power output and the boiler heat transfer. Answer. (Reheat temperature= 529°C , total turbine power output= 6487 kW, the boiler heat transfer= 16 475 kW)

Carnot Cycle A, B, C are connected in series so that the heat rejected from A will be the heat added to B and heat rejected from B will be added to C. Each cycle operates between 303K and 4000C. If heat added to A is 1000 kW, find the work output of C, kW, nearest tenths.