Precision air conditioner

Professional Terminology for Precision Air Conditioners And Components

Precision air conditioning refers to an air conditioner that can provide air circulation, air filtration, cooling, reheating, and temperature and humidity control to the computer room. Today let’s learn about the professional terminology of precision air conditioners.

Precision air conditioning

Cooling Type

Air-cooled

The air cooling system includes a precision air conditioning indoor unit and a matching outdoor unit. The outdoor unit uses air for cooling, and the air conditioning unit dissipates the heat in the machine room to the room air through the outdoor unit.

Water-cooled

The water cooling system includes a precision air conditioning indoor unit and a cooling tower. The cooling tower provides cooling circulating water to the precision air conditioning indoor unit. The air conditioning unit dissipates the heat in the machine room to the outdoor air through the cooling circulating water.

Chilled Water

The chilled water system includes a precision air-conditioning indoor unit and a chiller. The chiller provides refrigerated circulating water to the precision air-conditioning indoor unit. The air-conditioning unit dissipates the heat in the machine room to the outdoor air through refrigerated circulating water.

Double cold source

Double cold source systems are divided into air-cooled double cold sources, water-cooled double cold sources and chilled water double cold sources. The air-cooled dual cold source unit is based on the air-cooled unit plus an independent chilled water coil system. The water-cooled dual cold source unit is based on the water-cooled unit plus an independent chilled water coil system. The chilled water dual cooling source unit has two independent chilled water coil systems.

Free Cooling

Common natural cooling source systems are divided into two types: air-cooled natural cooling water chiller host + precision air conditioning indoor unit and precision air conditioning indoor unit + dry cooler. Among them, the former precision air-conditioning indoor unit is a chilled water precision air-conditioning unit, and the latter precision air-conditioning indoor unit has two independent refrigeration systems. The system can automatically switch between the two systems according to energy-saving conditions to achieve the maximum energy-saving effect and ensure the reliability of the machine. Balance between runs.

Precision air conditioner

Precision Air Conditioning Components

Compressor

An important component in air conditioners, used to pressurize gaseous refrigerant. Compressors commonly used in precision air conditioners include scroll compressors and rotor compressors.

Evaporator

The main components for heat exchange on the indoor side, the refrigerant flowing inside absorbs heat, and the air blown across the outer surface releases heat, forming heat exchange.

Ball Valve

Installed on the refrigeration system pipeline, it controls the on and off of the refrigerant and functions as a switch.

Filter Driers

Installed on the refrigeration system pipeline, used to dry and filter refrigerant.

Sight Glass

Installed on the refrigeration system pipeline, it is used to control the filling amount when charging refrigerant and to observe the system refrigerant condition at any time.

Thermostatic Expansion Valve

Installed on the refrigeration system pipeline, it plays the role of throttling and reducing pressure. It is divided into two types: thermostatic expansion valve and electronic expansion valve.

Humidifier

When the indoor humidity is low, a device that humidifies the indoor air. Humidifiers commonly used in precision air conditioners are divided into electrode humidifiers and infrared humidifiers.

Heater

When the indoor temperature is low, the equipment that heats the indoor air. Heaters commonly used in precision air conditioners are divided into aluminum finned heaters, PTC heaters and stainless steel winding heaters.

Fan

The power equipment for air circulation inside the unit is divided into centrifugal fan and axial fan according to the direction of gas flow; according to the power supply form of the motor, it is divided into AC fan and EC fan. The motor of the AC fan is an AC motor, and the motor of the EC fan is a DC motor, which has the characteristics of energy saving and high efficiency; centrifugal fans are divided into external rotor direct-coupled centrifugal fans and belt-driven centrifugal fans according to their structural forms;

Low Temperature Component

A component to ensure that the air conditioner can still start normally when the outdoor temperature is ultra-low (below -20°C).

Extension of the component

For air-cooling units, when the equivalent length of the connecting pipe between the indoor and outdoor units exceeds 30m, an extension assembly must be installed on the refrigeration system pipeline. An extension assembly includes a check valve and a solenoid valve.

Check Valve

Installed on the refrigeration system pipeline, the refrigerant can only flow along the inlet to prevent the refrigerant from flowing back.

Solenoid Valve

Installed on the refrigeration system pipeline, it controls the on and off of the refrigerant and plays a switching role.

Flooding sensor detector

Used to monitor whether there is water leakage in the air conditioning unit.

Precision air conditioning3

Airflow Supply Type

Mainly in terms of the location and direction of the air outlet of the air conditioner, it is an important consideration in air conditioner selection.

Downflow Supply

Applied to computer rooms with electrostatic floors (also called static pressure floors).

The air is discharged from the lower part of the air conditioner and sent under the electrostatic floor. There are holes in the electrostatic floor on the air inlet side of the cabinet. The cold air flows upward to the front of the cabinet. The cabinet absorbs the cold air to cool the electronic components. The discharged hot air returns to the air conditioner from the top of the air conditioner, forming an air flow cycle.

Upflow Supply

Applicable to computer rooms with ceiling air supply or duct air supply.

Top Front Supply

It is suitable for small base stations in small computer rooms with open spaces without ceilings, air ducts, or electrostatic floors.

A hood assembly is added to the top of the air conditioner to supply air from the front of the upper part of the air conditioner. The cold air flow is directly sent to the front of the cabinet. The cabinet absorbs the cold air to cool the electronic components, and the discharged hot air returns to the air conditioner from the front of the lower part of the air conditioner, forming an air flow cycle.

Horizontal Airflow Supply

Applicable to situations where air conditioners and cabinets are placed side by side.

The air conditioner sends out cold air horizontally along the entire height direction, and the cold air flow is sent to the front of the cabinet. The cabinet absorbs the cold air to cool the electronic components, and the discharged hot air returns to the air conditioner from the rear of the air conditioner, forming an air flow cycle.

Precision air conditioner Air supply method

Application

Static floor

In the construction of the computer room, a multi-purpose electrostatic floor with lower wiring is used. There is an overhead layer between the electrostatic floor and the floor for wiring, water pipes, air conditioning ducts, etc., making the construction of the computer room more beautiful.

Heat Load

The total amount of heat generated in the computer room. Including equipment heat dissipation, heat transfer between maintenance structures such as walls and the outside world, and personnel heat dissipation.

High Density Load

There are many servers placed in a single cabinet, and a single server has high power and large heat dissipation.

Cold/hot aisle

Cabinets in the computer room are generally placed back-to-back and head-to-head. The head-to-head passage is called a cold aisle. The back-to-back aisle sections are called hot aisles.

Application

Cold/Hot Aisle Containment

In order to save energy in the computer room, the entire cold aisle or hot aisle is usually sealed to contain the air flow in the aisle to reduce the mixing of cold air and hot air.

Positive/Negative Fall

The positive height outdoor unit is installed higher than the indoor unit. Negative drop means that the outdoor unit is installed lower than the indoor unit.

Application

Oil Trap

When the vertical height of the indoor and outdoor unit is more than 10m, the air pipe should be installed with oil traps at every 6m of vertical height so that the oil can smoothly return to the compressor for lubrication.

Monitoring

Use a remote terminal to remotely manage and control the air conditioner without going to the machine to operate.

Standby-Rotation

In order to ensure the reliability of the computer room, N+1, 2N or 2N+1 backup of the air conditioner is carried out according to the reliability level of the computer room, and a backup unit will operate after a failure. In order to protect the life of the unit, even if there is no fault, the main unit and the backup unit will be rotated for a certain period of time.

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