CDCP - Certified Data Centre Professional Cooling and Environmental Control Questions and Answers

Question 1

A data center manager is reviewing the environmental conditions of a server room housing enterprise-grade servers and storage. According to ASHRAE TC 9.9 thermal guidelines for Class A1 equipment, which of the following represents the recommended temperature range at the IT equipment intake?

Accepted Answer

18°C to 27°C (64.4°F to 80.6°F)

Answer

ASHRAE TC 9.9 provides guidelines for data processing environments. For Class A1 equipment, which includes most enterprise servers, the recommended dry-bulb temperature range at the server inlet is 18°C to 27°C (64.4°F to 80.6°F). This range is considered optimal for equipment reliability and energy efficiency.

Question 2

A data center is experiencing issues with electrostatic discharge (ESD) causing intermittent component failures. Which environmental condition is the most likely cause of this problem?

Accepted Answer

Low relative humidity (<40% RH)

Answer

Low relative humidity (below 40% RH) increases the risk of electrostatic discharge (ESD). When the air is too dry, static electricity can build up and discharge into sensitive electronic components, causing damage or failure. High humidity, conversely, can lead to condensation and corrosion.

Question 3

Which of the following best describes the primary operational difference between a Computer Room Air Conditioner (CRAC) unit and a Computer Room Air Handler (CRAH) unit?

Accepted Answer

CRAC units use a refrigerant-based direct expansion (DX) system, while CRAH units use chilled water.

Answer

The fundamental difference lies in their cooling method. CRAC units function like a traditional air conditioner, using a compressor and refrigerant in a direct expansion (DX) cycle to cool the air. CRAH units, on the other hand, use chilled water supplied from a central chiller plant, which is passed through a cooling coil to cool the air blown across it.

Question 4

A data center manager implements a hot aisle/cold aisle containment strategy. What is the primary benefit of this design approach?

Accepted Answer

It prevents the mixing of cool supply air and hot equipment exhaust air, improving cooling efficiency.

Answer

The main purpose of a hot aisle/cold aisle layout, especially with containment, is to separate the cold air being supplied to IT equipment from the hot air being exhausted by it. This separation prevents re-circulation and mixing, which allows the cooling system to operate more efficiently, increases the return air temperature to the cooling units, and helps eliminate hot spots.

Question 5

When designing an environmental monitoring system for a new data center, where does ASHRAE recommend placing temperature sensors for the most effective thermal management of a server rack?

Accepted Answer

At least six sensors: top, middle, and bottom at both the front (intake) and back (exhaust) of the rack.

Answer

To get a complete and accurate picture of the thermal conditions within a rack, ASHRAE guidelines recommend placing a minimum of six temperature sensors. These should be located at the top, middle, and bottom of the rack at both the front air intake and the rear air exhaust to monitor the temperature gradient across the equipment.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Cooling and Environmental Control Questions and Answers