What is the equation for energy balance?

What is the equation for energy balance?

Energy balance = energy input – energy output It doesn’t look very complicated, does it? But you may not have the numbers to do the math. So to figure out your energy balance you need to gather some important information.

How do you calculate the efficiency of a steam power plant?

Because approximately 3,412 Btu/hr equals 1 kW, we can easily determine the thermodynamic efficiency of a power plant by dividing 3,412 by the heat rate. For example, a coal power plant with a heat rate of 10,000 Btu/kWh has a thermal efficiency of 3,412/10,000, or 0.3412 (34.12%).

How do you calculate the enthalpy of a steam turbine?

1. 6-A steam Turbine inlet steam pressure & temperatures are 104 kg/cm2 & 540 C0 & exhausts at pressure 0.09 kg/cm2 & temperature 43 Deg C calculate the.
2. Enthalpy of inlet steam = 829 kcal/kg.
3. Exhaust liquid enthalpy = 44 kcal/kg.
4. Exhaust enthalpy by considering 90% dryness fraction = 44 + 0.9 X 616.44 =598.76 kcal/kg.

How do you calculate material balance and energy balance?

1. Material and energy balances can be worked out quantitatively knowing the amounts of materials entering into a process, and the nature of the process. 2. Material and energy balances take the basic form Content of inputs = content of products + wastes/losses + changes in stored materials.

What is entropy balance equation?

The entropy balance equations can be introduced by using the expression (for dV=0) T d S = d E − ∑ k μ k d n k to write. [15a] On insertion of eqns [14] and [10], one obtains. [15b] The above may be rearranged by repeated application of the vector identity cited earlier; standard manipulations lead to the final result.

Is heat balance and energy balance same?

1.7A Conservation of Energy Energy can appear in many forms. Then, only the enthalpy of the materials (at constant pressure), the standard chemical-reaction energy (ΔH0) at 25°C, and the heat added or removed must be taken into account in the energy balance. This is generally called a heat balance.

What is the formula of plant efficiency?

The efficiency of a plant is the percentage of the total energy content of a power plant’s fuel that is converted into electricity. LCV = Lower Calorific Value (same as NCV = Net Calorific Value) neglects thermal energy gained from exhaust H2O condensation.

What is the overall efficiency of steam power plant?

The overall efficiency of the steam power plant is about 29%. So, the overall efficiency of the power plant is equal to the multiplication of the efficiencies of the boiler, turbine, and generator.

How is steam energy calculated?

This Enthalpy for Saturated Steam can be obtained at atmospheric pressure from above Table, i.e., hg = 2676 KJ/Kg, So now Enthalpy required for saturated liquid to convert into saturated steam can be obtained as follows, Latent Heat ( he ) = hg – hf = 2676 – 419 = 2257 KJ / Kg.

How much energy is in steam?

The energy released when steam condenses to water is in the range 2000 – 2250 kJ/kg (depending on the pressure) – compared to water with 80 – 120 kJ/kg (with temperature difference 20 – 30 oC).

How are the properties of a steam turbine determined?

Calculates the energy generated or steam outlet conditions for a steam turbine. Using the Steam Property Calculator, properties are determined using Inlet Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality). The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow:

How is the mass flow equation related to the energy equation?

Combining the mass flow equations with the energy equation leads to the final equation relating the mass flow rate of the dry air to the circulating cooling water of the condenser, as follows: The mass flow rate of the liquid water at stations (3) and (4) is normally provided from the condenser energy equation of the steam power plant.

How are potential and kinetic energies related in a steam generator?

First, in many systems (especially steam generators) potential and kinetic energies are very minor compared to other energy changes and can be overlooked. Second, in a steady flow process such as in a steam generator, the system does not accumulate energy, so dE c.v. /dt = 0.

What is the energy equation for a simple system?

The classic energy equation for a simple system (defined as a control volume in textbooks) is: Q – WS = m2 [V 22 /2 + gz 2 + u 2 + P 2 Ï… 2] – m 1 [V 12 /2 + gz 1 + u 1 + P 1 Ï… 1] + dE C.V. / dt