An Investiagtion of Thermocouple Psychrometer, I

Kawata, Suekichi; Ômori, Yoshirô

doi:10.1143/jpsj.8.768

Cited by 7 publications

(3 citation statements)

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“…When the leaking liquid is water, according to the formula 51 recommended by the World Meteorological Organization (WMO), the temperature difference expression of two thermometers is as follows:

normalΔt = t_{d} - t_{w} = \frac{e_{w} ((), t_{normalw}) - U / 100 \cdot e_{w} ((), t_{normald})}{AP},

where ∆ t is the temperature difference between two thermometers (°C); e w ( t d ) and e w ( t w ) are the saturated water vapor pressures in pure horizontal plane corresponding to the dry thermometer indicator t d and the wet thermometer indicator t w , respectively, (MPa); U is the environmental relative humidity (%RH); A is the dry‐wet bulb coefficient (°C −1 ), which depends on the ventilation speed and the shape of the thermometer; and P is the atmospheric pressure (MPa).…”

Section: Pipeline Leakage Monitoring Technology Based On the Eets‐fbgmentioning

confidence: 99%

“…The wind speed increases by 0.3 m/s, and the stable temperature difference increases by 0.32°C on average. This is because the value of the dry‐wet bulb coefficient A in Equation 1 is affected by the wind speed, 51 and the larger the wind speed, the smaller the dry‐wet bulb coefficient. The empirical formula for the dry‐wet bulb coefficient A and wind speed are as follows:

A = 0.00001 \times ((), 65 + \frac{6.75}{v}),

where v is the wind speed, m/s.…”

Section: Pipeline Leakage Monitoring Model Test and Influencing Factomentioning

confidence: 99%

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Pipeline leakage monitoring experiments based on evaporation‐enhanced FBG temperature sensing technology

Sun

Shi

Zhang

et al. 2021

Struct Control Health Monit

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Summary The water distribution systems in utility tunnel are considered as the lifeline projects. The leakage monitoring of water supply and drainage pipelines is closely related to the overall operation and safety of the utility tunnel. However, conventional pipeline leakage monitoring methods are difficult to realize the monitoring of ordinary temperature liquid and small leakage. Moreover, they also have problems with noise interference, high false alarm rate, and high cost. In order to overcome the shortcomings of the conventional methods, the evaporation‐enhanced Fiber Bragg Grating (FBG) temperature sensing (EETS‐FBG) method was proposed as a new type of leakage monitoring solution according to the principle of the psychrometer. This method utilizes the evaporative cooling characteristics of water‐absorbing porous materials and the FBG temperature sensors to realize leakage monitoring. On the basis of experiments, the feasibility of this method is explored, and the effects of wind speed, liquid temperature, and leakage volume on monitoring results are analyzed. The experimental results show that the EETS‐FBG method can monitor the temperature difference of 0.97–8.55°C in the humidity of 51.0–90.8%RH, and the measured values are in good agreement with the theoretical values, which shows that the method has good feasibility. In addition, the measured temperature difference increases with the ambient wind speed, while the leakage volume and water temperature have no obvious effect on the temperature difference, which shows that the method has good reliability and universal applicability. This method has outstanding advantages for normal temperature liquid and small leakage monitoring and is worthy of application and promotion.

show abstract

normalΔt = t_{d} - t_{w} = \frac{e_{w} ((), t_{normalw}) - U / 100 \cdot e_{w} ((), t_{normald})}{AP},

Section: Pipeline Leakage Monitoring Technology Based On the Eets‐fbgmentioning

confidence: 99%

A = 0.00001 \times ((), 65 + \frac{6.75}{v}),

where v is the wind speed, m/s.…”

Section: Pipeline Leakage Monitoring Model Test and Influencing Factomentioning

confidence: 99%

Pipeline leakage monitoring experiments based on evaporation‐enhanced FBG temperature sensing technology

Sun

Shi

Zhang

et al. 2021

Struct Control Health Monit

View full text Add to dashboard Cite

show abstract

“…The psychrometer also requires skilled operators to make accurate measurements [ 18 ]. The effects of various factors such as atmospheric pressure, size of a psychrometer, ventilation conditions, or freezing of wet bulbs have been examined and support measurement theory [ 19 ]. The complexity of the wet bulb measurement environment is a limiting factor in improving its measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

An Inexpensive, Stable, and Accurate Relative Humidity Measurement Method for Challenging Environments

Zhang

Yang

2016

Sensors

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In this research, an improved psychrometer is developed to solve practical issues arising in the relative humidity measurement of challenging drying environments for meat manufacturing in agricultural and agri-food industries. The design in this research focused on the structure of the improved psychrometer, signal conversion, and calculation methods. The experimental results showed the effect of varying psychrometer structure on relative humidity measurement accuracy. An industrial application to dry-cured meat products demonstrated the effective performance of the improved psychrometer being used as a relative humidity measurement sensor in meat-drying rooms. In a drying environment for meat manufacturing, the achieved measurement accuracy for relative humidity using the improved psychrometer was ±0.6%. The system test results showed that the improved psychrometer can provide reliable and long-term stable relative humidity measurements with high accuracy in the drying system of meat products.

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Energy metabolism and evaporative water loss in the California ground squirrel

Baudinette

1972

J. Comp. Physiol.

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An Investiagtion of Thermocouple Psychrometer, I

Cited by 7 publications

References 0 publications

Pipeline leakage monitoring experiments based on evaporation‐enhanced FBG temperature sensing technology

Pipeline leakage monitoring experiments based on evaporation‐enhanced FBG temperature sensing technology

An Inexpensive, Stable, and Accurate Relative Humidity Measurement Method for Challenging Environments

Energy metabolism and evaporative water loss in the California ground squirrel

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