What is chilled water air conditioning system?

Asked By: Moumna Shinjinee | Last Updated: 1st March, 2020
Category: home and garden indoor environmental quality
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Chilled water systems - In a chilled-water system, the entire air conditioner is installed on the roof or behind the building. It cools water to between 40 and 45 degrees Fahrenheit (4.4 and 7.2 degrees Celsius). The chilled water is then piped throughout the building and connected to air handlers.

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Besides, what is chilled water return?

A fan blows air through the cooling coil to provide cold air to the building's space. Essentially, the chilled water absorbs heat from the building inside the AHUs and FCUs. After exiting the heat exchanging coil, the chilled water return (CHWR) returns to the chiller, where it is cooled again, and the process repeats.

One may also ask, how do chilled water coils work? Chilled water coils also known as hydronic cooling coils are typically used to cool or remove moisture from air streams. The air to be cooled moves through the fins, and either water or an ethylene or propylene glycol solution move through the tubes.

Thereof, how does chiller air conditioning work?

In most process cooling applications, a pumping system circulates cool water or a water/glycol solution from the chiller to the process. The high-pressure gas enters the condenser where ambient air or condenser water removes heat to cool it to a high-pressure liquid.

What are the components of chilled water system?

The main chiller components are the Compressor, Condenser, Evaporator, Expansion Valve, Power Panel, Controls unit and the Water Box.

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What is chilled water used for?

Chilled water is commonly used in buildings to provide cooling. Typically, water is cooled in chiller units, and is then distributed by pipework to air handling units where it is used to cool air that is ducted through the building for ventilation.

How is chilled water produced?

Chilled Water System Basics. This water is pumped through chilled water piping throughout the building where it will pass through a coil. Air is passed over this coil and the heat exchange process takes place. The heat in the air is absorbed into the coils and then into the water.

What is the difference between cold water and chilled water?

Chilled water is water that's deliberately made colder, often with mechanical refrigerator (chiller) systems, to be used in some part of an industrial system. Cooling water is water used as a heat-transfer medium to carry heat away from one or more parts of a system.

What is the difference between chilled water and condenser water?

While chilled water systems are used to absorb heat energy from within a building or process, condenser water systems are used to remove that heat energy from the building and reject it to the atmosphere. In essence, the condenser water system connects the chiller to the cooling tower through supply and return piping.

What type of water should be used in a chilled water system?

These commonly use deionized water (DI) which resists the flow of electrical current. In other applications water glycol is required to protect from freezing and bacterial growth.

How do chillers work diagram?

In the case of chillers, heat is taken from the fluid being chilled and transferred to the ambient air. The refrigeration cycle begins with the compressor. The compressor takes low-pressure low-temperature refrigerant in gas form and compresses it into a high-pressure high-temperature gas.

What is the difference between a chiller and a cooling tower?

Chillers utilize compressors, evaporator heat exchangers and condenser heat exchangers. The condenser heat exchanger is the major component that rejects heat from the chillers to air. Cooling towers are generally used to provide cooled water to electric power generation and mechanical processes.

What is the difference between HVAC and chiller?

Here are some examples of differences between an Industrial Chiller and an HVAC chiller: Industrial chillers have independent water and refrigeration circuits. Most HVAC chillers have independent refrigeration circuits, but not independent water circuits. HVAC chillers often share a multi-circuit evaporator.

What is the function of a cooling tower?

A cooling tower is a heat rejection device, which extracts waste heat to the atmosphere though the cooling of a water stream to a lower temperature. Common applications for cooling towers are providing cooled water for air-conditioning, manufacturing and electric power generation.

Which gas is used in chiller?

Mechanical gas chillers use clean dry nitrogen, argon or air to achieve temperatures between -100 and 300°C.

How do you start a chiller?

Start-up of a chiller normally takes place at light load conditions and begins with the removal of the shut-down tag from the chiller. At this point it is important to verify that the chilled and condenser water valves are in their proper operating positions. Then, the cooling tower and heat exchangers can be filled.

What is difference between AHU and FCU?

In simple terms, an air handling unit (AHU) is a component of an HVAC system that cools and distributes air into the space through a duct. A fan coil unit (FCU) is a standalone system that circulates the existing air in a small space, but it can also be a part of an HVAC system.

How does a cooling tower and chiller work together?

A cooling tower acts as a giant heat exchanger. It sits on the roof of the building and blows ambient air across a coil to remove heat and exhaust it outside. Together, chillers and cooling towers make it possible to air condition large spaces.

How do air handling units work?

An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-conditioning system. The basic function of the AHU is take in outside air, re-condition it and supply it as fresh air to a building. All exhaust air is removed, which creates an acceptable indoor air quality.

How does an expansion valve work?

Expansion Valve. The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. Under a greatly reduced pressure the liquid refrigerant is at its coldest as it leaves the expansion valve and enters the evaporator.