Construction outside measurement

Changing weather conditions to measure the outdoor environment humidity challenge, therefore, for often depends on the outdoor relative humidity measurement or calculation based on humidity parameter to optimize cooling equipment in terms of energy efficiency building hvac system, selecting the appropriate sensor is very important to ensure its high performance.If outdoor humidity sensor is not accurate, building control,Energy efficiency and comfortTo reach the ideal state.The choice of sensors is often neglected, but this is an important decision for building owners, because they want to work in the building of the whole life period bear this is not an ideal situation for a long time.

Free cooling

When the outdoor air temperature is dry enough, temperature control air side economizer can take advantage of the outdoor air to the building cooling, no other adjustments.This is called free cooling.Economizer consists of the following parts: outdoor and return air throttle damper, throttle damper actuators, outdoor air enthalpy (temperature and humidity) sensors or dry bulb temperature (only) sensor, discharge temperature sensors and economizer controller.Some economizer in outdoor air enthalpy level lower than indoor air enthalpy value level, through the use of outdoor air control enthalpy.But with low temperature and low enthalpy value level may still bearing the high humidity of outdoor air.A better solution is to use only the dew point temperature is below the required level of indoor dewpoint temperature of outdoor air, to avoid moisture accumulation in approximately.

For water side economizer, free cooling is by working fluid (water) to bypass the cooler and cooling directly by the cooling tower.Cooling towers use hot water to eliminate the process of evaporation, and the working liquid cooling to close to the wet bulb temperature of air.Working liquid and evaporation of the liquid is usually water.Outdoor wet-bulb temperature readings is to determine the efficiency of the cooling tower and start the refrigeration cycle required free of charge.This process is suitable for cold, dry climate, in such a climate, wet bulb temperature will be significantly lower than the dry bulb temperature of air.

Whether using lateral air economizer and water economizer, maintenance managers have to rely on their outdoor sensors to provide accurate information.Sensor drift and instability may be harmful, especially toThe data centerSuch as high energy consumption facilities.High quality with close tolerance outdoor humidity transmitter is to calculate other parameters (such as dew point, enthalpy and wet bulb) required.Reliable outdoor sensor will be able to recover from saturated condition, and even some sensors with built-in heating cycle in order to prevent saturation.

Outdoor transmitter combinations

Visa, outdoor humidity transmitter is equipped with the core sensing technology, as a result, even in very bad outdoor conditions can also keep accurate and stable measurement.Visa pull HUMICAP ®The sensor can fully recover from water saturation.Also for high humidity environment provides an optional heating function, in order to prevent condensation.Visa, outdoor transmitter combinations including measurement of humidity parameters (relative humidity, dew point, wet ball, enthalpy, mixing ratio), temperature, wind, precipitation,Carbon dioxideAnd atmospheric pressure.The transmitter of wide working temperature range, suitable for the vast majority of climate conditions, installation flexibility, and equipped with protection equipment of sun shade and radiation protection cover.