What is the function of economizer in chiller?

An economizer is a relatively simple mechanical device with sophisticated controls. The economizer constantly monitors outdoor air temperature. It automatically draws outdoor air into the cooler/freezer whenever it is cold enough to substitute for compressor-generated cooling.

What is the function of condenser in steam power plant?

A surface condenser or steam condenser is a water-cooled shell and tube heat exchanger used to condensate the exhaust steam from the steam turbine in thermal power stations: the steam is converted from gaseous to liquid state at a pressure level below atmospheric pressure.

What is the function of economizer in thermal power plant?

Function of economiser in thermal power plant is to recover some of the heat from the heat carried away in the flue gases up the chimney and utilize for heating the feed water to the boiler.

What is the function of fusible plug in the boiler?

The function of fusible plug is to protect the boiler from damage due to overheating of boiler tubes by low water level. it is simply a hollow gun metal plug screwed into the fire box crown.

What is the function of economiser and air preheater?

Air Preheaters

Similar to economisers, they are devices that transfer heat from one surface to another - but this time from fluid to air. The main objective is to increase the thermal efficiency of a boiler system by recovering the heat from the flue gas and using it to heat the air.

What is the purpose of the economizer system in aviation?

Dosing out extra fuel helps lower potentially higher cylinder temperatures at these power settings. (It's called an economizer since less of an extra ration of engine-cooling fuel enters the cylinders at low power conditions when it's not necessary.)

What is the function of boiler?

Boiler design is the process of designing boilers used for various purposes. The main function of a boiler is to heat water to generate steam. Steam produced in a boiler can be used for a variety of purposes including space heating, sterilisation, drying, humidification and power generation.

What is the main function of air preheater?

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas.

What is the function of an air preheater Mcq?

Explanation: The function of an air preheater is to heat the air that is supplied to the furnace. It helps in the combustion and eases the burning of coal.

What is the function of the feed water pump of a boiler?

Boiler Feed Pumps are designed to handle the amount of pressure your operation needs. Boiler feedwater pumps transport water into boilers using high pressure. Thus, a boiler feed pump is built to handle extremely high water pressure to deliver the feedwater into the boiler system.

What is the function of safety valves in the boiler?

In steam systems, safety valves are typically used for boiler overpressure protection and other applications such as downstream of pressure reducing controls. Although their primary role is for safety, safety valves are also used in process operations to prevent product damage due to excess pressure.

What is the function of blowdown valve of a boiler?

The primary purpose of blowdown is to maintain the solids content of boiler water within certain limits. This may be required for specific reasons, such as contamination of the boiler water. In this case, a high blowdown rate is required to eliminate the contaminants as rapidly as possible.

What is the function of a condenser in mechanical engineering?

The main function of condenser is to convert gaseous form of exhaust steam into liquid form at a pressure of below atmosphere. Cooling medium is used water to convert steam into water.

What is the function and classification of steam condenser?

A steam condenser is a closed vessel heat exchanger that is used to convert low-pressure steam to water. The pressure inside a steam condenser is kept below the atmospheric pressure to increase efficiency. It is generally used for lowering the backpressure of the exhaust of the turbine end.

How does an economizer work on a boiler?

Economizers capture heat from the exhaust flue and return it to the boiler by heating the incoming feedwater. By heating the feedwater, the boiler does not have to expend as much fuel to turn the water into steam. Over the long term, fuel costs are the top expense involved in running a boiler.

What is the purpose of an economizer on a rooftop unit?

In a nutshell, an economizer is a mechanical vent attached to a roof top unit (RTU) that opens to draw-in outside air for cooling a building when the outside air temperature is cool and dry enough.

What is preheater in power plant?

Preheaters are normally either gas or electrical resistance heat and are designed to heat the wire to the melt temperature of the plastic being applied to the wire or just slightly below the melt temperature.

What is preheater in cement plant?

Preheaters are used industrial dry kiln cement production plants to heat the raw mix and drive off carbon dioxide and water before it is fed into the kiln.

What is flue gas in boiler?

Flue gas (sometimes called exhaust gas or stack gas) is the gas that emanates from combustion plants and which contains the reaction products of fuel and combustion air and residual substances such as particulate matter (dust), sulfur oxides, nitrogen oxides, and carbon monoxide (Table 3.7).

What is the function of steam?

Domestic. Steam's capacity to transfer heat is also used in the home: for cooking vegetables, steam cleaning of fabric, carpets and flooring, and for heating buildings. In each case, water is heated in a boiler, and the steam carries the energy to a target object.