Actively and passively aspirated temperature sensors in a windless environment like greenhouses

Ramesh, NT and Arakeri, JH (2019) Actively and passively aspirated temperature sensors in a windless environment like greenhouses. In: Sadhana - Academy Proceedings in Engineering Sciences, 44 (4).

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Abstract

Windless environments are prevalent in greenhouses, where precise temperature control is critical to the health of plants and errors in temperature measurement must be avoided. A mathematical model based on heat balance is used to estimate the error in temperature sensors under different conditions and sensor geometries. The model is then applied to two geometries and solved numerically. The sensors used are a T-type thermocouple and a Sensirion SHT 75. Experiments are carried out in a greenhouse prototype to replicate conditions in a greenhouse and validate the error model. Active ventilation of the sensors is provided by a fan and passive ventilation is provided using a model built on the concept of a �solar chimney�. It is shown that even small flow rates can decrease the error shown by unventilated sensors by as much as 10°C. © 2019, Indian Academy of Sciences.

Item Type:	Journal Article
Publication:	Sadhana - Academy Proceedings in Engineering Sciences
Publisher:	Springer
Additional Information:	cited By 0
Keywords:	Chimneys; Errors; Greenhouses; Heat transfer; Solar chimneys; Temperature measurement; Thermocouples, aspiration; Error model; Heat balance; Passive ventilation; Sensor geometries; Small flow-rate, Temperature sensors
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	24 Apr 2019 05:38
Last Modified:	25 Sep 2022 06:10
URI:	https://eprints.iisc.ac.in/id/eprint/62212

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