Here are 20 chiller questions answered
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Chiller Interview Questions
What does a CHILLER do?
A chiller is a chiller that is used to generate ice waterwhich can be used, for example to provide air conditioning in buildings.
Why use chiller?
- a) In large buildings, the cold generation is centralized in a single point.
- b) By concentrating the generation of cold, the need for a large number of air conditioning equipment is avoided.
- c) The need for electrical and power connections throughout the building is avoided.
- d) Having less equipment reduces the chances of failure.
- e) Excess ducts are avoided throughout all the premises.
- f) The distribution of the low temperature is carried out by means of pipe networks that carry the ice water to all the premises of the building.
- g) If the selection of the chiler is adequate, it can generate quite interesting efficiency values.
How is the traditional chiler?
The traditional chiller consists of a compression refrigeration circuit with the four basic components, plus the water distribution:
- a) evaporator.
- b) condenser.
- c) compressor.
- d) expansion device.
- e) Water distribution system.
How does the chiler work internally?
- a) The refrigerant inside the refrigeration circuit passes through the evaporator, where it is at low pressure and low temperature, in this way it can cool and generate ice water.
- b) The ice water passes through the evaporator, to cool down, but never mixes with the refrigeration circuit.
- c) The ice water is directed to the building, and cools the premises.
- d) The refrigerant inside the refrigeration circuit, leaves the evaporator with the heat that was removed from the ice water, and enters the compressor.
- e) The refrigerant gets pressure in the compressor, to be taken to the condenser.
- f) In the condenser, the heat that was removed to the ice water is lost.
- g) The refrigerant passes through the expansion device, to lower its pressure and become cold again.
- h) The refrigerant enters the evaporator and the cycle is repeated.
What are the types of chillers?
By the type of condenser cooling, we can classify them into:
- a) chiller with air-cooled condenser.
- b) chiller with condenser cooled with fresh water.
How does the air cooled chiller work?
- a) The traditional chiller has a compression refrigeration circuit, where the heat needs to be dissipated in the condenser.
- b) When the chiller is air cooled, powerful fans are needed in the condenser to help release the heat, which was removed to the ice water.
How does the water-cooled chiller work?
- a) The traditional chiller has a compression refrigeration circuit, where the heat from the condenser needs to be dissipated.
- b) When the chiller is cooled by water, an additional fresh water circuit is needed, passing through the condenser, to help release the heat, which was removed from the ice water.
- c) In these equipments there are two totally different water circuits.
- d) There is an ice water circuit to cool the premises of the building, and a fresh water circuit to cool the chiller condenser.
Where are the air conditioning chillers located?
The chiller can be located in the basement, or up on the roof of the building.
How is ice water produced?
- a) the ice water is produced in the evaporator of the refrigeration circuit.
- b) Usually the ice water leaves the chiller at a temperature of 7 degrees Celsius.
What do you do with ice water?
- a) A centrifugal type pump sends the ice water around the building.
- b) Chilled water enters the air handling units, to cool the air of the premises within the building.
What do air handling units do?
- a) They are responsible by means of coils, to remove the heat from the air inside the building, using the ice water from the chillers.
- b) The management unit totally conditions the air, mixes it, moistens or dehumidifies it and adapts it to the needs within the building.
How is the air cooled in the air handler unit?
- a) The chilled water from the chiller is passed through coils, through which the air flows that need to be cooled pass.
- b) Water enters the amu at a temperature of 7 degrees Celsius, 44 Fahrenheit and exits at 12 degrees, 54 Fahrenheit.
- c) Meanwhile the air notably lowers its temperature, thereby air conditioning the building.
What do you do with the ice water coming out of the air handler unit?
- a) When the ice water leaves the air handling unit, it comes out with a higher temperature, a product of the cooling carried out in the air, usually 12 degrees Celsius, 54 Fahrenheit.
- b) the water should be brought back to the chiller to cool down again, and brought back to 7 degrees Celsius, 44 Fahrenheit.
What happens to the ice water again when it comes out of the chiller?
- a) When the water comes out of the chiller, it will have given up the heat gained in the air handling unit.
- b) The ice water will return to 7 degrees Celsius, 44 Fahrenheit.
How is the working cycle of the chilled water in the chiller installation?
- a) The cycle repeats and repeats, the water comes out of the chiller at 7 degrees Celsius, 44 Fahrenheit.
- b) The water is directed to the air handler unit and gains 5 degrees Celsius, 10 Fahrenheit
- c) The water returns to the chiler at 12 degrees Celsius, 54 Fahrenheit
- d) the water comes out of the chiller again at 7 degrees Celsius, 44 Fahrenheit.
Why is the water coming out again at 7 degrees Celsius, 44 Fahrenheit?
- a) The heat from the ice water reaches the chiller.
- b) The ice water now has a temperature of 12 degrees. centigrade, 54 Fahrenheit.
- c) The heat from the water is delivered to the refrigerant in the cooling circuit in the chiller.
- d) the heat of the refrigerant leaves the latter circuit, through the condenser of the chiller refrigeration circuit.
What does the heat received in the condenser of a water-cooled chiller do?
- a) The heat from the condenser is sent to another water circuit at room temperature.
- b) Water at room or cool temperature belongs to a totally different circuit, to the ice water circuit.
- c) The new heat exchange with the new water circuit, we will call it the exchange of the fresh water circuit.
How does the fresh water circuit of the water cooled chiller condenser work?
- a) There is a new centrifugal pump station, which we will call cooling tower pumps.
- c) The water is carried through the circuit, towards the cooling tower.
What is a cooling tower?
- a) The cooling tower is the point where air from the outside environment is forced into the tower.
- b) The tower uses a powerful internally located fan.
- c) The air inside the tower dissipates and rejects the heat of the water that has just cooled the condenser.
How many exchanges do we have, in the installation with chiller cooled with fresh water?
we have four heat exchanges.
- a) heat exchange of the chilled water with the internal air of the premises, to cool the air of the building.
- b) Heat exchange of the refrigerant within the refrigeration circuit, to generate the ice water.
- c) heat exchange of the refrigerant of the refrigeration circuit, with the fresh water circuit, to send the heat of the condenser refrigerant to the environment.
- d) Heat exchange of the fresh water, with the outside air, to cool the fresh water.
What happens to the fresh water in the cooling tower circuit?
- a) Fresh water reaches the chiller condenser at a temperature of 30 degrees Celsius, 86 Fahrenheit.
- b) The cool water takes the heat away from the condenser, and goes from 30 to 35 degrees Celsius, 86 to 96 Fahrenheit.
- c) Through a system of pumps, fresh water is taken to the cooling tower.
- d) Fresh water loses heat in the cooling tower, and goes from 35 to 30 degrees Celsius. 96 to 86 Fahrenheit.
- e) Fresh water at 30 degrees centigrade is directed back to the chiler condenser. 86 Fahrenheit.