Building Infra Flashcards
What are some of the solutions to protect the data center against power failures?
Battery and diesel generators are used to back up the external supply
What are rotary UPS systems?
Rotary Uninterruptible Power Supply (UPS) systems are designed to provide backup power and ensure continuous operation of data centers in the event of power disturbances or outages. These systems combine mechanical and electrical components to deliver a reliable power solution.
What are some of the components of the cooling systems in data centers?
Coolers, heat-exchangers, and cold water tanks
What is fresh air cooling?
Fresh air cooling, also known as free cooling or economizer cooling, is a method used in data centers to reduce the energy consumption associated with traditional mechanical cooling systems. This technique leverages the cooler outside air to maintain the temperature within the data center, thus decreasing the reliance on energy-intensive air conditioning systems.
How does fresh air cooling works?
- Intake of Outside Air: Fresh air cooling systems bring in cool air from the outside environment into the data center.
- Filtering: The incoming air is filtered to remove dust, pollutants, and other contaminants that could harm the equipment.
- Air Distribution: The filtered air is distributed throughout the data center to cool the servers and other equipment.
- Exhaust: Warm air generated by the equipment is expelled outside the data center, ensuring a continuous flow of fresh, cool air.
- Temperature and Humidity Control: Sensors and control systems monitor the temperature and humidity levels to ensure that they remain within acceptable ranges for data center operations.
What are the differences between open loop and closed loop systems
Free cooling, i.e., open-loop, refers to the use of cold outside air to either help the production of chilled water or directly cool servers. It is not completely free in the sense of zero cost, but it involves very low-energy costs compared to chillers.
Closed-loop systems come in many forms, the most common being the air circuit on the data center floor.
• The goal is to isolate and remove heat from the servers and transport it to a heat exchanger.
• Cold air flows to the servers, heats up, and eventually reaches a heat exchanger to cool it down again for the next cycle through the servers.
What is the Closed-loop with two loops
The air flow through the underfloor plenum, the racks,and back to the CRAC (a 1960s term for computer room air conditioning) defines the primary air circuit, i.e., the first loop.
The second loop (the liquid supply inside the CRACs. units) leads directly from the CRAC to external heat exchangers (typically placed on the building roof) that discharge the heat to the environment.
What is a water cooled chiller
A water-cooled chiller is a type of refrigeration system used to cool water or other liquids, which in turn is used to cool air or equipment.
How does a cooling tower cool a water stream?
Cooling towers cool a water stream by evaporating a portion of it into the atmosphere. They do not work as well in very cold climate because they need additional mechanisms to prevent ice formation.
What is a tree loop system and how does it works?
See picture 6S in the Comp Infra album
What are the advantages and disadvantages of fresh air cooling?
Fresh air cooling can be very efficient, but does not work in all climates, requires filtering off airborne particles, and can introduce complex control systems
What are the advantages and disadvantages of two loop systems
Are easy to implement, relatively inexpensive to construct, and offer isolation for external contamination, but typically have lower operational efficiency
What are the advantages and disadvantages of the three loop systems?
It is the most expensive to construct and has moderately complex controls, but offers contaminant protection, and good efficiency
What are in rack coolers?
They add air to water heat exchanger at the back of a rack, so the horror exiting from service immediately flows over coils cooled by water
What are in row cooling?
They are air to water heat exchangers (cooling coils) adjacent to the rack
