scholarly journals RANCANG BANGUN INSTRUMEN PENGUKUR SUHU DAN KELEMBAPAN UDARA MENGGUNAKAN DT-SENSE SHT11

2014 ◽  
Vol 14 (2) ◽  
pp. 113
Author(s):  
Imam Hidayat ◽  
Hesky Stevy Kolibu ◽  
Slamet Suyitno Raharjo
Keyword(s):  
Air Temperature ◽  
Low Cost ◽  
Measurement Instrument ◽  
Field Trials ◽  
Test Results ◽  
Standard Measurement ◽  
Humidity Measurement ◽  
Measurement Tools ◽  
Temperature And Humidity ◽  
The Difference

ABSTRAK Telah dilakukan pembuatan instumen pengukur suhu dan kelembapan udara menggunakan sensor DT-Sense SHT11 dan modul mikrokontroler DT-AVR Low Cost Micro System. Kemudian instrumen diuji dengan alat ukur standar. Pengujian dilakukan mulai bulan Juni 2013 dan berakhir bulan Oktober 2013di Laboratorium Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Sam Ratulangi Manado dan pengujian lapangan dilakukan di Stasiun Meteorologi Kelas II Maritim Bitung. Hasil pengujian dianalisis dengan metode grafik, analisis Korelasi dan Uji t sampel berpasangan. Hasilnya berhasil dibuat dengan ketelitian pengukuran hingga 0,01oC untuk pengukuran suhu udara dan 0,0001% untuk pengukuran kelembapan udara. Terdapat selisih antara instrumen yang dibuat dengan alat ukur standar. Rata-rata 1,4 oC untuk suhu udara dan 3% untuk kelembapan relatif. Kata kunci: sensor, mokrokontroler, SHT11   DESIGN AND BUILD OF AIR TEMPERATURE AND HUMIDITY MEASUREMENT INSTRUMENT USING DT-SENSE SHT11 ABSTRACT Have been made a temperature and humidity measurement instrument using DT-Sense sensor SHT11 and microcontroller modules DT-AVR Low Cost Micro System.‎ Then the instrument was tested with standard measurement tools. The tests were conducted starting in June 2013 and ended in October 2013 at the Laboratory of Physics, Faculty of Mathematics and Natural Sciences, Sam Ratulangi University and field trials conducted in Class II Meteorological Station Maritime Bitung. The test results were analyzed by graphical method, correlation analysis and paired sample t test.The result of measurement accuracy up to 0,01oC for measuring air temperature and up to 0,0001% for air humidity measuring. The difference between the instruments are made with standard measurement tools. An average of 1.4 ° C for temperature and 3% for relative humidity. Keywords: sensor, microcontroller, SHT11

Performance Evaluation of a Smart Mobile Air Temperature and Humidity Sensor for Characterizing Intracity Thermal Environment

2020 ◽  
Vol 37 (10) ◽  
pp. 1891-1905
Author(s):  
Chang Cao ◽  
Yichen Yang ◽  
Yang Lu ◽  
Natalie Schultze ◽  
Pingyue Gu ◽  
...  
Keyword(s):  
Air Temperature ◽  
Humidity Sensor ◽  
Thermal Environment ◽  
Spatial Scales ◽  
Low Cost ◽  
Thermal Conditions ◽  
Absolute Humidity ◽  
Health Concern ◽  
Vegetation Fraction ◽  
Temperature And Humidity

AbstractHeat stress caused by high air temperature and high humidity is a serious health concern for urban residents. Mobile measurement of these two parameters can complement weather station observations because of its ability to capture data at fine spatial scales and in places where people live and work. In this paper, we describe a smart temperature and humidity sensor (Smart-T) for use on bicycles to characterize intracity variations in human thermal conditions. The sensor has several key characteristics of internet of things (IoT) technology, including lightweight, low cost, low power consumption, ability to communicate and geolocate the data (via the cyclist’s smartphone), and the potential to be deployed in large quantities. The sensor has a reproducibility of 0.03°–0.05°C for temperature and of 0.18%–0.33% for relative humidity (one standard deviation of variation among multiple units). The time constant with a complete radiation shelter and moving at a normal cycling speed is 9.7 and 18.5 s for temperature and humidity, respectively, corresponding to a spatial resolution of 40 and 70 m. Measurements were made with the sensor on street transects in Nanjing, China. Results show that increasing vegetation fraction causes reduction in both air temperature and absolute humidity and that increasing impervious surface fraction has the opposite effect.

scholarly journals Simulation analysis and optimization research on cooling and dehumidifying effects for evaporator

2020 ◽  
pp. 167-167
Author(s):  
Shuailing Liu ◽  
Guoyuan Ma ◽  
Shuxue Xu ◽  
Fuping Li ◽  
Chenzhe Hang
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Moisture Content ◽  
Linear Relationship ◽  
Air Temperature ◽  
Simulation Analysis ◽  
Evaporation Temperature ◽  
Temperature And Humidity ◽  
The Difference

The improvement performance of refrigerating dehumidification system was theoretically discusses based on a dehumidification model. The influence of evaporator inlet wind speed, dry bulb temperature and relative humidity on dehumidification were analysed by the model. The results show that, when inlet air temperature and humidity were kept constant, the dehumidification capacity increased first and then decreased with increase of the wind speed; When the moisture content and the wind speed of the inlet air were kept constant, the dehumidification capacity gradually decreased with increase of the inlet air dry bulb temperature; The inlet air dry bulb temperature was between 21-36 ?C and the relative humidity was between 40% and 85%, the difference between the inlet air wet bulb temperature and the evaporation temperature at the optimum COP was about 10 ?C; There was a nearly linear relationship between the corresponding evaporation temperature at the optimal COP and the evaporation temperature with the maximum dehumidification capacity, compared with the test value, the error was less than 10%.

scholarly journals Study on the general dynamic model of biomass drying processes

2018 ◽  
Author(s):  
Le Wang ◽  
Xu Li ◽  
Qiaoling Li ◽  
Duanfeng Lu ◽  
Bin Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Moisture Content ◽  
Dynamic Model ◽  
Equilibrium Moisture Content ◽  
Air Temperature ◽  
Temperature And Humidity ◽  
The Difference ◽  
Cut Tobacco ◽  
Two Parameters

Nowadays most studies of drying processes dynamics are established on  empirical models without clear physical meanings, which could not predict the drying characteristic on different dryers. In order to describe the change of temperature and water content in the cut tobacco in different dryers, a mathematical model based on heat and mass transfer phenomena was developed, and the model employed the relationship of equilibrium moisture content and air humidity as basis, the difference of moisture between biomass and wet air as mass transfer driver, and the difference of temperature between biomass and wet air as heat transfer driver. The drying experiments under different air temperature and humidity are carried out on the batch rotary dryer, and the variance of temperature and moisture content in the biomass is obtained by using infrared thermometer and oven. The model is validated by two parameters with experiment data under each condition of air temperature and humidity. The results show that the drying dynamic model is well on accuracy and universality, and it could be applied on different drying device to predict the characteristic of kinds of drying processes.Keywords: cut tobacco; drying dynamics; equilibrium moisture content; heat transfer; mass transfer.   

Temperature and Humidity Measurement Based on Wireless Sensor Network Technology

2010 ◽  
Vol 439-440 ◽  
pp. 46-50 ◽  
Author(s):  
Xiao Chen
Keyword(s):  
Data Storage ◽  
Humidity Sensor ◽  
Low Cost ◽  
Wireless Sensor ◽  
Dual Function ◽  
Humidity Measurement ◽  
System A ◽  
Wireless Transceiver ◽  
Temperature And Humidity ◽  
Working Principle

To overcome the shortcomings of wired temperature and humidity measurement system, a temperature and humidity measuremet system based on wireless sensor networks was designed. the components of the system and its working principle were described in detail. Its nodes use a digital temperature and humidity sensor SHT15 for data collection, wireless transmission chip CC1100e for data short-range wireless transceiver and the wireless network, and AT89S52 microcontroller for controlling core. Nodes communicate with the background host through serial interfaces. The system can achieve environmental temperature and humidity dynamically and comprehensive real-time monitoring. Node has a dual function as terminals and routers, in addition to data processing, but also for other nodes to forward the temperature and humidity data storage, management, and integration, and taking in collaboration with other nodes to complete some specific tasks. The system has some advantages such as low cost, low power consumption and small size, which has a good application prospects.

Strretlight pole metal as the medium of Tetragonula sp nest in Indralaya, South Sumatra

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Hanifa Marisa
Keyword(s):  
Zea Mays ◽  
Air Temperature ◽  
Hevea Brasiliensis ◽  
Citrullus Lanatus ◽  
Ground Surface ◽  
Temperature And Humidity ◽  
Surface Diameter ◽  
Very High

An investigation had been done to Tetragonula (Tetragona) sp nest at Indralaya, South Sumatra to describe the Tetragonula sp nest that use streetlight pole as nest medium during April - May 2019. Purpossive sampling is used to select the target nest. Two streetlight pole found be used by Tetragonula sp as their home. The coordinate of location, heght from ground surface, diameter of streetlight pole, air temperature and humidity, and floral species around nest, were noted. Spot coordinate are S 30 14’ 19.2498’’ and E 1040 39’ 15,3288’’ ; 1,5 m above the ground surface, 12 cm diameter pole, highest air temperature was 35 o C at daylight (April and May 2019), 80 – 90 % humidity at April-May 2019; which Switenia macrophyla, Hevea brasiliensis, Zea mays, and Citrullus lanatus floral species are planted around. Air temperature in the pole is very high, around 40 0 C during daylight.

scholarly journals Comparison of Building Simulation Methods for Modeling Apartment Balconies

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3955
Author(s):  
Yonghan Ahn ◽  
Hanbyeol Jang ◽  
Junghyon Mun
Keyword(s):  
Heat Transfer ◽  
Air Temperature ◽  
Parameter Analysis ◽  
Interior Space ◽  
Heating And Cooling ◽  
Significant Difference ◽  
Calculation Results ◽  
Infiltration Parameter ◽  
The Difference ◽  
Heating And Cooling Load

The purpose of this study is to compare the load calculation results by a model using the air changes per hour (ACH) method and a model using an airflow network (AFN) and to ascertain what causes the difference between the two models. In the basic case study, the difference in the heat transfer distribution of the model in the interior space was investigated. The most significant difference between the two models is the heat transfer that results from infiltration. Parameter analysis was performed to investigate the relationship between the difference and the environmental variables. The result shows that the greater the difference is between the air temperature inside the balcony and the outdoor air temperature, and the greater the air flows from the balcony to the residential area, and the greater the heating and cooling load difference occurs. The analysis using the actual weather files of five domestic cities in South Korea rather than a virtual case shows that the differences are not so obvious when the wind blows at a constant speed throughout the year, but are dominant when the wind does not blow during the night and is stronger alongside the occurrence of sunlight during the day.

Sign in / Sign up

Export Citation Format

Share Document