What are economizers explain in detail?
An economizer is a mechanical device used to reduce energy consumption. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements. Airside economizers pull cooler outside air directly into a facility to prevent overheating.
What is the function of economizer *?
Function of the economizer: Economizer works as a heat exchanger by preheating a fluid which as a result minimizes energy consumption. In a steam boiler, it heats the fluid and recovered residual heat which in turn is used to preheat the boiler feed water that is ultimately converted to superheated steam.
How many types of economiser are there?
Economizers are heat exchangers that transfer the heat in the flue gas to another medium‚ generally the boiler feed-water‚ although other streams are sometimes used such as make-up water. There are 2 types of economizers: non-condensing and condensing.
Why economiser is used in chiller?
An economizer is a type of sub-cooler that uses part of the total refrigerant flow from the condenser to cool the rest of the refrigerant flow (see Figure 10.13). The cold gas from the economizer can also be used to provide extra cooling for the compressor.
Why economiser is used in boiler?
In boilers, economizers are heat exchange devices that heat fluids, usually water, up to but not normally beyond the boiling point of that fluid. They are a device fitted to a boiler which saves energy by using the exhaust gases from the boiler to preheat the cold water used to fill it (the feed water).
What is the function of economiser and air preheater?
Economizers are basically tubular heat transfer surfaces used to preheat boiler feed water before it enters the steam drum. By recovering the energy from the flue gas before it is exhausted to the atmosphere this performs a key function in providing high overall boiler thermal efficiency.
Is economizer a heat exchanger?
An economizer is a type of heat exchanger that recovers heat from flue gasses to preheat fluids or puts it to use in another part of the production process. This recovery process saves on fuel consumption and costs, as well as it reduces the CO2 emission.
Is Cochran a water tube boiler?
Cochran boiler is a multi-tubular vertical fire tube boiler having numbers of horizontal fire tubes. It is the modification of a simple vertical boiler where the heating surface has been increased by means of numbers of fire tubes.
What is the difference between economiser and air preheater?
1. economizer requires lesser space and surface area compared to the air heater due to the high tube side water heat transfer coefficient and larger U compared to the air heater. In addition,extended surfaces make them very compact. Air heaters have very low overall U and hence huge.
How does a superheater work?
Superheaters and reheaters are specially designed to increase the temperature of the saturated steam and to help control the steam outlet temperature. They are simple single-phase heat exchangers with steam flowing inside and the flue gas passing outside, generally in the cross flow.
How does an economiser work refrigeration?
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 ammonia economizer?
Refrigerant Economizer The ammonia two-stage economizer is typically used in a two-stage screw compressor to compensate for loss of gas as well as to super-cool liquids.
What is an economizer, and how does it work?
An economizer is a part of the outdoor system , most often mounted on the roof, of an HVAC system for commercial buildings. The economizer evaluates outside air temperature and even humidity levels. When the exterior air levels are appropriate, it uses the outside air to cool your building.
Why do you need an economizer?
The largest advantages of an economizer are reductions in energy consumption and the cost of maintaining the temperature in a commercial building. According to Powerhouse Dynamics, a single rooftop unit compressor for a small commercial building can draw 5 kilowatt (kW) while it’s running, costing several thousand dollars a month in warmer months.
What does an economizer do?
An economizer is a mechanical device used to reduce energy consumption. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements.
What is the economizer in chiller system?
Economizer in chiller system is the mechanical device or unit allowing to reduce energy consumption and improve the efficiency of chiller system. This is done by cooling the hotter side either outside the building or inside.