The data center of sensor
Data center owners and managers is acutely aware of the necessity of improving energy efficiency.The industry consumption accounts for about 1% of global electricity consumption of electricity, badly affected due to fluctuations in energy costs, urgent need to improve energy efficiency.At the same time, governments around the world are focused on the energy demand of the industry, reduce fossil fuel use and reduce greenhouse gas emissions.
Data center about 60% of the energy demand driven by their IT infrastructure, and therefore more efficient equipment, usually the new equipment, have the opportunity to help reduce energy consumption.In another 40% of the energy demand, however, there are good opportunities for efficiency;Most of them from the data center cooling and air conditioning systems.
High temperature and humidity control to ensure IT infrastructure with good state of operation is very important.In many modern facilities, expected uptime is 99.999%;This means that every year there are only a few minutes of down time.As a result of the IT infrastructure to deal with data and processes is very important and valuable, good performance is necessary.
As well as other measures for efficient process efficiency, to achieve efficient energy management, cannot leave the accurate, reliable and continuous monitoring data.So, for the data center, data must be measured?Where is the measurement again?
The temperature
Our cooling and air conditioning measures must be taken to eliminate the heat generated by the IT equipment, in order to avoid overheating and prevent failure.Monitoring channel and, therefore, frame and all the space, the ventilation system of pipes, pipe cooling systems and outdoor temperature is very important.Crucially measuring position, of course, should have representative, and sensor networks can detect potential cold or hot.
Room is bigger, may be more difficult to monitor, because their space temperature are more likely to change, so should be equipped with a sufficient number of temperature sensors to monitor to ensure that all servers, it is very important.Some servers may distance cooling device, some are far away;Some may be on the bottom rack, others in a higher position, so there was the possibility of a three dimensional change.In addition to the deployment of a sufficient number of sensors, therefore, to ensure that the appropriate place in the whole server room cooling device and the air flow is also very important.
Most of the data center need to monitor temperature difference (delta T), which usually refers to the temperature difference between hot and cold channels.In reality, however, the situation is more complicated, because if you want to cooling operating as efficiently as possible, actually need to monitoring and four different temperature (1).
The most obvious difference in temperature is the temperature of the air through IT equipment before and after difference.The second is often measured temperature cooling equipment temperature difference.In reality, however, leave the air cooler of air temperature had little to do with reach IT equipment at the same temperature.Usually because there are obstacles, eddy current, pressure difference, the problem such as air pockets, they lead to mixed hot and cold air.Likewise, leave IT equipment air temperature when IT enters the cooler is usually lower.It is usually because there are several reasons for mixed hot and cold air;All these show that airflow management efficiency is low.
Therefore, four temperature difference include:
- The temperature difference before and after IT equipment
- The temperature difference before and after cooler
- Leave the air cooler and air temperature difference between into the IT equipment
- Leave IT equipment of the temperature difference between the air and into the cooler air
The four temperature difference through accurate monitoring, data center managers can better understand the factors leading to low efficiency of cooling, and on the basis of establishing mitigation and improvement measures, with fine adjustment data center performance.
Under the condition of dry climate, evaporative cooling can heat effectively.In cold climates, you can use the dry cold air cooling directly.In recent years, liquid cooling solution becomes more and more popular, because they can more effectively and heat dissipation.In order to support this trend, visa has developed a new sensor used for measuring the temperature of the liquid cooling/heating.Visa TMI110 is an immersion temperature transmitter, can provide accurate quick response.TMI110 is popular for air pipe HMT120 HMD60, used in the indoor air measurement, accurate measurement, and data center with Indigo platform and extensive hvac products.
humidity
The adverse effects of IT equipment also will be affected by humidity;humidity较低会增大静电的风险，因此可能需要喷雾或蒸发加湿器。但是，同时应避免湿度过高的情况，因为这会导致冷凝和金属设备遭腐蚀。
In colder climates, can use the cooler outside air cooling data centers in the form of energy-saving equipment.The external air may be low, absolute water content and relative humidity in the air when heat is reduced, so unless a proper control measures, or humidity may drop to below the acceptable level.
Position and application of different, the required humidity measurement types are different.Can, for example, in a room, space, pipes and outdoor measuring relative humidity and dew point, while in the cooling tower and evaporative humidifier need to measure the wet bulb temperature, economizer and air side may need enthalpy sensor.Enthalpy value associated with the thermodynamic changes of the total thermal energy (heat and latent heat).These calculate humidity parameters usually can directly from the humidity sensor (such as visa pull sensor).
To control the air side economizer of three common sensor configuration is dry bulb, single enthalpy and enthalpy.Although dry bulb control is the most simple in three ways, but if the environment temperature is a bit high and relatively dry do not open the economizer, may not be able to obtain potential energy saving effect.
Principle of double enthalpy is similar, only USES two enthalpy sensor;A monitoring of outdoor air, and the other monitoring return air.If outdoor air enthalpy value is less than the return air enthalpy, economizer will run.
Visa to pull the transducer designed for air conditioning and energy saving applications;measurementhumidity和温度，得出露点、湿球温度和焓值的输出。虽然温度测量通常不会受漂移影响，但传统湿度传感器会出现漂移，所以维萨拉的湿度传感器采用了 HUMICAP® 技术，具备长期稳定性，并且对灰尘和冷凝等干扰不敏感。这些薄膜电容式湿度传感器已被需要长期准确、可靠、免维护湿度测量的多种应用的客户广泛使用并认可。
Pipeline of airflow can make quick response to the changing conditions of sensor, and the air flow in the room and other Spaces can be slow, so some data centers use more like dew point temperature as the humidity control parameters, because it does not depend on the temperature of the sensor.
May be deployed in the data center of the other sensors will measure between pipe and cold hot channelDifferential pressure, and additional outdoor meteorological parameters, for exampleAir pressure, rainfall, wind speed and direction.These measurements can be made by automatic meteorological station, a single sensor or visa WXT530 instrument, the instrument USES solid state technology, greatly reduce the operating and maintenance costs.The location of the outdoor sensor should be on the air circulation, away from the possible radiation heat and the surface of the interference measurement.Outdoor measurement, of course, must be the same with indoor measurement accurate and reliable, so even in the bad environment, visa, reliable meteorological instrument can also provide the required reliability.
Reference 1. Four temperature - www.upsite.com/blog/the-4-delta-ts-of-data-center-cooling-what-youre-missing/
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