Air Temperature Analysis and Control Improvement for the Storage Ring Tunnel

2006 ◽  
Author(s):  
Jui-Chi Chang ◽  
June-Rong Chen ◽  
Zong-Da Tsai ◽  
Ming-Tsun Ke
Keyword(s):  
Air Temperature ◽  
Storage Ring ◽  
Temperature Analysis ◽  
And Control

Reconstruction for the brilliance-upgrading project of the Photon Factory storage ring

1998 ◽  
Vol 5 (3) ◽  
pp. 366-368 ◽  
Author(s):  
M. Katoh ◽  
Y. Hori ◽  
Y. Kobayashi ◽  
S. Sakanaka ◽  
M. Izawa ◽  
...  
Keyword(s):  
Control Systems ◽  
Storage Ring ◽  
Normal Cell ◽  
Beam Position ◽  
Vacuum Chambers ◽  
Photon Factory ◽  
Systems And Control ◽  
Accelerating Cavities ◽  
And Control ◽  
Beam Position Monitors

Reconstruction of the Photon Factory storage ring (PF ring; 2.5 GeV) is now in progress to provide very brilliant synchrotron radiation to users, i.e. the emittance is being reduced by a factor of five. Components, such as the quadrupole and sextupole magnets, vacuum chambers, beamlines and beam-position monitors, are being replaced by new ones in 16 normal-cell sections of the PF ring. The accelerating cavities, injection systems and control systems are also being replaced. Operation will commence when the improvements are completed on 1 October 1997.

Transient Thermodynamic Modeling of Air Cooler in Supercritical CO2 Brayton Cycle for Solar Molten Salt Application

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Ankur Deshmukh ◽  
Jayanta Kapat ◽  
Akshay Khadse
Keyword(s):  
Carbon Dioxide ◽  
Air Temperature ◽  
Heat Exchangers ◽  
Dynamic Simulations ◽  
Power Cycle ◽  
Air Cooler ◽  
Temperature Operating ◽  
And Control ◽  
Start Ups ◽  
Transient Operations

Abstract Supercritical carbon dioxide Brayton power cycle is getting commercially attractive for power generation due to numerous advantages like zero water usage, compactness, low environmental emission, and potential to reach high thermal efficiency at lower costs. A typical recuperated closed cycle consists of three heat exchangers (main heat exchanger, cooler, and recuperator) and two turbomachinery (turbine and compressor). Rapid changes in ambient temperature, operating loads, start-ups, and shutdowns affect the performance and operation of the turbomachinery and heat exchangers. The purpose of this research article is to study the thermodynamic parameters of the air cooler during transient operations by running dynamic simulations. Magnitude of change in carbon dioxide temperature due to change in air temperature is calculated. The simulation is a setup by having a steady-state design of 100 MWe cycle with operating temperature of 700 °C and pressure of 250 bar. Dynamic simulations are done using lms amesim. Transients studied in this article include: (i) step variation, (ii) standard variation, and (iii) linear variation of air temperature. This study thus serves as a framework to develop a design and control basis governed by transient scenarios.

scholarly journals Influence of building orientation on internal temperature in saharan climates, building located in Ghardaïa region (Algeria)

2013 ◽  
Vol 17 (2) ◽  
pp. 349-364 ◽  
Author(s):  
Sidi Bekkouche ◽  
Tayeb Benouaz ◽  
Mohamed Cherier ◽  
Maamar Hamdani ◽  
Mohamed Yaiche ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Thermal Insulation ◽  
Air Temperature ◽  
Thermal Inertia ◽  
Numerical Data ◽  
Internal Temperature ◽  
And Control ◽  
The Mathematical Model ◽  
Do So

In desert regions, the orientation of buildings has an important influence in the inside air temperature. In the present work, we carry out a study on the influence of the buildings orientation as well as the thermal insulation on the internal temperature. To do so, we have considered the case where only the exposed walls are isolated. The main objective of the current work is to determine the temperatures of the building in question with and without thermal insulation. This study aims at assessing also the geographic parameter enhancing or damping the role of thermal inertia, providing a variety of results. As result, this work proves that stones play a contradictory role on thermal comfort. We have verified that thermal insulation is specified to reduce heat transfer through the building. Concerning the orientation, results indicates that the variation in orientation does not influence significantly the internal air temperature of a well thermally insulated building. Moreover, in hot period, whatever orientation considered, the phenomenon of overheating presents a serious problem to minimize consumption of energy and control of indoor temperature in case of building without insulation. The numerical data was compared to the experimental measurements in order to validate the mathematical model. In conclusion, to achieve a better thermal comfort arid and semi arid regions, the habitation will have to be situated in south flan of a hill to satisfy the two strategies (hot and cold).

HOST SELECTION BY THE FIR ENGRAVER, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE): PRELIMINARY FIELD STUDIES

1971 ◽  
Vol 103 (12) ◽  
pp. 1717-1725 ◽  
Author(s):  
George T. Ferrell
Keyword(s):  
Air Temperature ◽  
Host Selection ◽  
Sex Ratios ◽  
Field Studies ◽  
Flight Activity ◽  
Host Trees ◽  
Visitation Rates ◽  
White Fir ◽  
Early Afternoon ◽  
And Control

AbstractDaily emergence of Scolytus ventralis Lec. from infested white fir bolts was highest in early afternoon (1200–1600 hours, P.D.S.T.) and limited to periods when air temperature exceeded 21 °C. More females than males emerged each day; the ratio in the total emergence was 1.9:1 and as high as 2.8:1 on warmest days. Flight occurred from mid-July to mid-September, with peak flight in mid-August. The intensity of flight activity was positively associated with varying temperatures above 24 °C (threshold).Visitation rates on lower boles of white firs were 10 times higher than those on Jeffrey pines. Two to three times as many beetles were trapped near girdled or severed white firs as about uninjured firs. Severed trees under attack by S. ventralis attracted three to seven times as many beetles as uninjured firs. When attack density reached 10 to 13 mines per sq. ft, the large number of beetles attracted in flight did not initiate mines in the trees already attacked but attacked surrounding host trees. Sex ratios of beetles trapped at experimental and control trees did not differ from that at emergence.

scholarly journals Control, Regulation and Command System of Hydronic Radiant Floors Heating by Wireless and Energy Harvesting Sensors and Actuators

2013 ◽  
Vol 543 ◽  
pp. 389-392 ◽  
Author(s):  
Gilberto Batista ◽  
Pedro Dinis Gaspar ◽  
Pedro D. Silva
Keyword(s):  
Energy Harvesting ◽  
Thermal Comfort ◽  
Air Temperature ◽  
Heating System ◽  
Comfort Level ◽  
Sensors And Actuators ◽  
Control Regulation ◽  
Radiant Temperature ◽  
And Control ◽  
Actual Control

This paper presents the development of an innovative control, regulation and command system for hydronic radiant floors, more flexible and efficient that guarantees a better thermal comfort to the user and simultaneously improves the energy efficiency of this type of heating system. The majority of the actual control of hydronic radiant floors is done by thermostats that measure the air temperature and control the actuators (pumps and valves) in order to maintain the room at the specified temperature. These systems requires the frequent adjustment of thermostats set-point in order to obtain thermal comfort as it depends on other factors than just the air temperature, such as, the air humidity, external environmental conditions, radiant temperature, among others. This paper presents a control, regulation and command solution that requires minimum user intervention, as the user only has to choose the desirable thermal comfort level. The control algorithm is based on the calculation of PMV (Predicted Mean Vote) index as defined on Thermal Comfort Standard ISO 7730. Another advantage of the proposed system is related to the wireless and energy harvesting sensors and actuators that provide much more flexibility to the system.

scholarly journals Design of the Humidity and Temperature Controller Using the Moistures of Leaf and Soil

2021 ◽  
Vol 16 (4) ◽  
pp. 421-433
Author(s):  
Walaa Kareem Khalaf ◽  
Yong Tae Kim
Keyword(s):  
Air Temperature ◽  
Output Voltage ◽  
Water Flow Rate ◽  
Reference Value ◽  
Field Capacity ◽  
Small Range ◽  
Environment Change ◽  
Moisture Sensor ◽  
Temperature And Humidity ◽  
And Control

A controlling of air temperature and humidity is important issue because environment change has effects on growing stages of plants. In this study a (DHT22, AH-300u, YL-69) sensors and a microcontroller (arduino Uno) have been used to monitoring and controlling the temperature, humidity of air and control irrigation process based on monitoring the moistures of (soil, plant leaf) data inside the greenhouse prototype. The findings during the experiment time (4 days) indicates that the air temperature maintain at reference value 27℃ and relative humidity has a slightly increase by 0.7 from reference value (82). The output voltage of soil moisture sensor has been monitor at a small range (0.8 v - 1 v) roughly stable, and it is near to field capacity. The output voltage of leaf moisture sensor is slightly increased. From this study it has been observed that the proposed system in a greenhouse is a good procedure to maintain air temperature and humidity inside the greenhouses and effective for monitoring air factors as well as soil and leaf moistures. regarding irrigation process, a decision table has been suggested to control the irrigation water flow rate according to output voltage of each of soil and leaf moistures sensors.

scholarly journals 537 PB 043 ROWCOVER AND BLACK PLASTIC MULCH EFFECTS ON TOMATO PRODUCTIONS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 508d-508
Author(s):  
Ibrahim G. Rubeiz ◽  
Marlene M. Freiwat
Keyword(s):  
Air Temperature ◽  
Total Yield ◽  
Fruit Size ◽  
Plastic Mulch ◽  
Fruit Setting ◽  
Negative Effect ◽  
Black Plastic ◽  
Effect On Yield ◽  
Yield Time ◽  
And Control

Tomato cv. Alwadi were grown under floating rowcover, black plastic mulch, mulch plus rowcover, or no protection i.e. control, for studying the effect on yield in terms of earliness, total yield and average fruit size. Early yield was significantly increased by the mulch treatment while the rowcover treatment yielded the least (P < 0.05). Total yield was increased by the mulch and mulch plus rowcover treatments, while the rowover and control treatments yielded the least (P < 0.05). Soil temperature at 10 cm depth varied between 1° to 2°C only under the different treatments. Air temperature under the rowcover exceeded 35 to 40°C on many days, hence causing fruit setting problems and resulting in reduced early yield under the rowcover. Our results show that earliness is enhanced by black plastic mulch, while the rowcover alone can have a negative effect on yield. Time of rowcover removal above the mulch warrants further research.

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