![]() Regularly scheduled temperature and humidity measurements are one way that data center managers can troubleshoot environmental conditions. Data center managers need to be proactive by continually monitoring data center conditions. The temperature and humidity in the data center have a direct relationship to the proper functioning of the installed systems. If one unit is calibrated to add humidity, and an adjacent unit is calibrated to remove humidity, energy is wasted and an unacceptable environment can occur. ![]() It is also imperative that sensors on humidifiers are calibrated correctly. If very low temperatures are maintained with very low humidity levels, even a slight rise in temperature can lead to unacceptably low relative humidity levels. For instance, if very high temperatures are maintained with very high humidity levels, condensation can occur, which can cause corrosive equipment damage. Extremes within the 20% to 80% RH range can lead to unacceptable conditions. Though the 20% to 80% RH operating specifications for the servers are wide, conditions should be maintained near the optimal relative humidity levels. Electrostatic discharge is easily generated and less easily dissipated in areas where the relative humidity is below 35%, and becomes critical when relative humidity drops below 30%. When relative humidity levels are too high, water condensation can occur, which can lead to hardware corrosion problems.įurther, maintaining a relative humidity level between 45% and 50% helps avoid system damage or temporary malfunctions caused by intermittent interference from electrostatic discharge (ESD), which occurs when relative humidity is too low. This optimal range also provides the greatest operating time buffer in the event of an environmental control system failure.ĭata center equipment is particularly sensitive to high humidity levels. As air gets warmer, its volume increases and the amount of moisture it can hold increases, thus causing its relative humidity to decrease.Īmbient relative humidity levels between 45% and 50% are most suitable for safe server operations. Because air is a gas, it expands as it is heated. A volume of air at a given temperature can hold a certain amount of moisture. Relative humidity (RH) is the amount of moisture in a given sample of air at a given temperature in relation to the maximum amount of moisture that a sample could contain at the same temperature. The air conditioner might cycle out of its cooling mode while temperatures in the room still call for cooler air. The air conditioner might register that temperatures in the room are cooler than is actually the case. If tiles are laid out in that way, cold air returns to the air conditioner without circulating through the equipment. Measure conditions over a 24-hour period and compare results against historicalĪlso avoid cooling short cycles, which can occur if perforated tiles or grilled tiles are placed between the air conditioners and the nearest heat-producing equipment. Or 10% relative humidity during a 60-minute period. Conditions should not be allowed to change ![]() See Creating a Hot-Aisle/Cold-Aisle Layout and Facility Environmental Tests.Ĭhanges within a 60-minute period. Avoid placing temperature sensors in areas that are exposed to drafts or other uncontrolled airflow. The heat load in the data center can vary as a result of the density of heat-producing equipment located within the room. These measurements are necessary because temperatures in the data center are different depending on where in the room the measurements are taken. In a hot-aisle/cold-aisle cabinet layout, verify that the temperatures within the cold aisles are also within the servers' operating temperature ranges. Aisle TemperaturesĪisle temperatures can give you a first-level alert to conditions in the data center. Intake temperature is within the operating range of the system. Not necessarily the temperature of the air in the aisles. These temperatures apply to theĪir taken in by each server at the point where the air enters the server, and Range for the servers is either 5 to 40 oC (41 Further, this recommended temperature provides an operational buffer in case the environmental support systems are down. While most computer equipment can operate within a rather broad range, a temperature level near 22 oC (72 oF) is desirable because it is easier to maintain a safe associated relative humidity level at this temperature. ![]() An ambient temperature range of 21 to 23 oC (70 to 74 oF) is optimal for system reliability and operator comfort. ![]()
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