# Feed Water Heater Energy Balance: Closed Systems

• ricky agarwal
In summary, the conversation revolves around applying closed feed water heaters and open feed water heaters in a power plant and the energy balance equations that can be used. The specific question is about calculating the thermal efficiency of a regenerative power plant with given steam and condenser pressures.
ricky agarwal
energy balance for closed feed water heaters

That's a title, not a question.

yes...i would like to know how to apply close feed water heaters along with open feed water heater and what are energy balance equation we can apply ? if possible make suitable figure and how to get enthalpies around feed heaters?

Apply them to what? You're going to need to be a whole lot more descriptive about what you are asking in order for us to be able to help you.

applying them to power plant
ok...i type the whole question for you sir... to make you understand the problem better...
A regenerative plant operates with steam supplied at 30 bar and 300 C,and condenser pressure of 0.08 bar. The extraction point for two heater (one close and one open)are at 3.5 bar and 0.7 bar resp. calculate the thermal efficiency of the plant neglecting pump work.

## What is a feed water heater?

A feed water heater is a device used in power plants to heat up the condensed water from the condenser before it enters the boiler. This preheating process helps to improve the efficiency of the power plant by reducing the amount of fuel needed to heat the water to its boiling point.

## What is a closed system?

A closed system refers to a system where no matter can enter or leave, but energy can be exchanged with the surroundings. In the case of a feed water heater, the closed system refers to the process of heating the condensed water and returning it to the boiler without any loss of water or exchange of substances.

## Why is an energy balance important for feed water heaters in closed systems?

An energy balance is important because it helps to ensure that the amount of energy going into the feed water heater is equal to the amount of energy leaving it. This is necessary to maintain the proper functioning of the system and optimize its efficiency.

## How is the energy balance calculated for a closed system feed water heater?

The energy balance for a closed system feed water heater is calculated by taking into account the energy input (from the steam used to heat the water) and the energy output (from the preheated water leaving the feed water heater). The difference between the two values is the energy gained by the water.

## What factors can affect the energy balance in a closed system feed water heater?

The energy balance in a closed system feed water heater can be affected by several factors, such as the temperature and pressure of the steam, the temperature and flow rate of the condensed water, and any heat losses due to insulation or leakage. Other factors that can affect the energy balance include the quality of the heat exchanger and any changes in the operating conditions of the power plant.

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