What is coil economizer?

What is coil economizer?

Economisers are boiler feed water heating coils in which the heat from waste flue gases is recovered to raise the temperature of feed water supplied to the boiler, thereby increasing the fuel economy, steaming capacity, life of the boiler and reducing pollution. Economiser Coils are always water tube type.

What does an economizer circuit do?

Economizer circuits embrace the physics of solenoids and relays to bring power savings and improved reliability to solenoid driving. They provide a large current initially to pull in the armature of a solenoid or relay.

What is economizer in contactor?

The contactor economizer is used to lower the standby consumption of the solar car. It minimizes the required amount of energy through the contactor, just enough to keep the contactor connected.

What is important for operating a contactor with an external economizer?

Q: What is important for operating a contactor with an external-economizer? A: The operation of the external economizer should start only 100ms minimum after applying power to the coil. For the Pulse Width Modulation (PWM) TE recommends a minimum frequency of 20kHz. The magnetic force only depends on the coil current.

What is a waterside economizer?

For data centers with water- or air-cooled chilled water plants, a water-side economizer uses the evaporative cooling capacity of a cooling tower to produce chilled water and can be used instead of the chiller during the winter months. This can reduce the risk of data center down time.

What is a Gigavac contactor?

GIGAVAC is the world’s leading contactor manufacturer. GIGAVAC’s extensive line also includes compact high voltage relays and high voltage reed relays for specialized DC and RF applications. GIGAVAC invests in having inventory to provide most products from stock or with very short lead times.

How many types of economizer are there?

There are 2 types of economizers: non-condensing and condensing.

What is the main purpose of using an economizer in boiler?

A boiler economizer or flue gas heat recovery unit is a heat exchanger that is installed on the stack of a boiler. It is designed to recover heat that would otherwise be wasted. Economizers can be installed during a new boiler installation or retrofit on an existing system.

How many amps does a 24v contactor coil draw?

The Coil does not draw . 5 amps or 55 watts.

What is the working principle of contactor?

Operating Principle of a Contactor:The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. A normally closed (NC) contact completes the circuit between the fixed contacts and the moving contacts.

What is economizer mode?

An economizer is an add-on feature to an HVAC air handler that draws in outdoor air and mixes it with return air from indoors. Economizers cool buildings using outdoor air at night (free cooling). Economizers also ventilate many buildings.

What are chillers used for?

A chiller is a machine that removes heat from a liquid coolant via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles. This liquid can then be circulated through a heat exchanger to cool equipment, or another process stream (such as air or process water).

Why do contactors use a coil economizer?

In order to provide contactors with the highest possible performance in the smallest package the GX14, GX16, MX14, and MX16 contactors use a coil economizer. This allows the contactor to use a high powered coil during pull-in and a lower powered coil to hold the contacts in place once they have transferred.

Where is the economizer located in a steam boiler?

The economizer is a bunch of horizontal water tubes usually located in the back pass or second pass (after the primary superheaters and reheaters) of the boiler through which the feed water enters the boiler to absorb the residual heat from the exhaust flue gas and transfer it to the steam production cycle.

Which is economizer for GX high power contactors?

While Pulse Width Modulation based economizers have better efficiency, the GX and MX high power contactors use a two coil economizer to eliminate the possibility of EMI emissions and/or cross-talk on system control power.

Why are cross flow economizers more prone to plugging?

The cross-flow economizer had lower heat transfer coefficients and was more prone to plugging than the modern vertical economizer. In economizers the loss of tube thickness can be caused by gas side corrosion, sulfidation and acid dew point corrosion, or water side erosion corrosion.