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Item has been removed from cart. Customer added to cart. You need to select customer before adding products. You can only buy a limited number of this item. Climate Screen Usage. The Basics of Greenhouse Climate Control Plant growth and development is a complex process, strongly influenced by the greenhouse environment. These elements are influenced by: 1.
Greenhouse conditions : ventilation, heating, screening, lighting 3. Plant conditions : transpiration. Factors that influence plant growth. Photosynthesis The plant picks up carbon dioxide from the air, which, together with water, creates carbohydrates and oxygen. Respiration The plant transforms some of the carbohydrates into free energy used for maintenance processes. Transpiration Controls the water, nutrition uptake and cooling of the plant. Multiple sensors integrated in the vehicle seat supply the data required for the automatic control function, ensuring that individualized climate control remains within a predefined comfort range.
Manually switching the system on or off or even readjusting it becomes unnecessary — integrated humidity and temperature sensors take care of this. As the humidity and temperature measurement in figure 1 shows, the automatic control function keeps the air-conditioned seat within the comfort range. With manual control, the seat temperature is only adjusted when it no longer falls within the comfort zone.
Automatic control of air-conditioned seats therefore increases passenger comfort. The latest generation of ultra-compact sensors guarantee extremely short reaction times in measuring humidity and temperature. Measuring just a few millimeters in size, the sensors can be easily integrated into the seat structure. They measure directly at the point of contact with the vehicle occupant, thereby enabling seat ventilation and seat heating to be continuously controlled. The latest generation of sensors are exceptionally effective, measuring the humidity and temperature directly on the seat surface either through perforated leather or fabric upholstery.
The data collected by the sensors forms the basis for a control cycle in which the seat heating and seat ventilation are automatically and continuously controlled. Additional process optimization measures such as the inclusion of parameters from the air-conditioning system further enhance passenger comfort. Feeding the measurement data from the seat sensors into the climate control system as a whole also enhances efficiency see figure 2. If the temperature and humidity on the seat surface are within the comfort range, the air-conditioning system does not have to cool or heat the air as much, because the optimally air-conditioned seat provides the same level of comfort.
This even applies in situations where the air-conditioning system would usually increase its output due to the ambient temperature or humidity. The Swiss sensor manufacturer Sensirion has been providing the automotive market with comprehensive sensor solutions for many years. It is now using its experience in the physical variables of humidity and temperature to optimize comfort and safety in motor vehicles while reducing energy consumption. Earlier generations of sensors by Sensirion have found extensive use in vehicle climate control systems.
The company is accustomed to dealing with large order volumes and high quality demands.
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The fact that automatic climate control in vehicle seats is not simply a pipe dream has been underscored by successful early trials. Sensirion conducted various trials with the automatic air-conditioned seat. The results were impressive. Testing focused on various sensor measurement positions.
Climate control | Tristar
The reaction time, package and integration in a series product were assessed according to the location of the sensor in the seat. If the sensors are correctly positioned, they measure the actual temperature and humidity conditions on the seat surface.
The data is then processed by a software program, which in turn controls the seat's air-conditioning system and either ventilates or heats it. Under extreme conditions, the sensor technology and control software can significantly improve the seat temperature at a rapid pace. In a range of test situations, the integrated sensors made it possible to determine the reference value for a pleasant seat surface temperature as quickly as possible.
The seat ventilation or heating can then be activated to bring the seat surface temperature to within the approximate vicinity of the reference value in the minimum amount of time. Sensirion set the first sensor technology milestone over a decade ago with the world's first digital, fully calibrated humidity and temperature sensor.
It revolutionized the sensor market of the day. From then on it was much easier and required much less expertise from the customer to install sensors such as this. The technology enabled the sensor element to be fused with analog and digital processing electronics on a tiny CMOS silicon chip. Some four years ago, engineers at Sensirion developed the world's smallest humidity and temperature sensor, the SHT2x. Since then, millions of these sensors have been used in the automotive sector.
In , Sensirion set new benchmarks yet again in terms of size, energy consumption, unit quantities and price. The new sensor was the smallest in its class worldwide. And the bar was recently raised once again for humidity and temperature sensors with the launch of the first chip-scale package sensor.
With its very small size of 1. The next sensor revolution for the automotive market will be presented by Sensirion at the electronica trade fair Automatic climate control for vehicle seats is more than just a gimmick. It enhances the comfort level for passengers, which is especially important on long journeys. Truck drivers and other long-distance drivers are especially dependent on having an interior climate tailored to their needs.