scholarly journals Effect of the ridge position ratio on the thermal environment of the Chinese solar greenhouse

2021 ◽  
Vol 8 (5) ◽  
Author(s):  
Xiaoyang Wu ◽  
Xingan Liu ◽  
Xiang Yue ◽  
Hui Xu ◽  
Tianlai Li ◽  
...  
Keyword(s):  
Structural Design ◽  
Cfd Simulation ◽  
Thermal Environment ◽  
The South ◽  
The North ◽  
Dependency Relationship ◽  
Solar Greenhouse ◽  
Computational Fluid Dynamics Cfd ◽  
North Wall ◽  
Maximum Air Temperature

This paper clarified the mechanism of the south and north roofs' effect on the thermal environment of the Chinese solar greenhouse (CSG), using a new parameter: ridge position ratio (RPR), which can describe the dynamic dependency relationship between the south and north roofs. A mathematical model was established using a method of combining computational fluid dynamics (CFD) simulation with experiments, then the model was used to further analyse the effect of RPR on the thermal environment of the CSG. The experimental greenhouse was simulated as an empty building to obtain results independently from these factors including crop and ventilation conditions. The results showed that the occurrence time of the maximum air temperature will be delayed when RPR increases to 0.3 during the daytime. As RPR increases, the heat storage layer of the soil gradually becomes thinner, but the north wall remains unchanged. RPR has a relatively small effect on the minimum temperature of each greenhouse part during the night. Mathematical models of the relationships between RPR, the solar energy that entered the greenhouse and the released heat energy of the enclosure structures were established, respectively. This paper can provide theoretical guidance for the structural design of the CSG.

scholarly journals Numerical investigation of the north wall passive thermal performance for Chinese solar greenhouse

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3465-3476
Author(s):  
Yiming Li ◽  
Xingan Liu ◽  
Fengsheng Qi ◽  
Li Wang ◽  
Tianlai Li
Keyword(s):  
Solar Energy ◽  
Wall Thickness ◽  
Thermal Performance ◽  
Thermal Environment ◽  
Energy Utilization ◽  
Wall Material ◽  
The North ◽  
Solar Energy Utilization ◽  
Solar Greenhouse ◽  
North Wall

The fully passive solar energy utilization system of Chinese solar greenhouse is efficient for ensuring year-round cultivation of vegetables, owing to the high amount of heat charge and discharge characteristic of the north wall enclosure. In the present research, the thermal performance is investigated using CFD. A 3-D mathematical model has been established to evaluate the wall thickness, layered configuration and material property. The predicted thermal environments are in good agreement with the experimental measurements, indicating the reliability of the established numerical model. The results showed that the increase of north wall thickness could cause the waste of resources due to the thermal masses mainly concentrate in the superficial layer. Constructing layered configuration is rec-ommended for the north wall which uses Styrofoam in the outer layer to reduce heat loss. Nevertheless, the property of north wall material has little effect on the thermal environment. The research results, thus obtained, will give good guidance for completing the Chinese solar greenhouse engineering database and optimizing the solar energy utilization.

Effect of north wall internal surface structure on heat storage-release performance and thermal environment of Chinese solar greenhouse

2021 ◽  
pp. 174425912110134
Author(s):  
Yiming Li ◽  
Xiang Yue ◽  
Lei Zhao ◽  
Hui Xu ◽  
Xingan Liu ◽  
...  
Keyword(s):  
Heat Storage ◽  
Thermal Environment ◽  
Internal Surface ◽  
Surface Structures ◽  
Indoor Thermal Environment ◽  
The North ◽  
Yield And Quality ◽  
Solar Greenhouse ◽  
North Wall ◽  
Striped Wall

Chinese solar greenhouse (CSG) is an energy-saving agricultural building which is used to grow vegetables in winter. The north wall of CSG plays an crucial role in concerning the production yield and quality during the winter months. To improve the thermal performance of north wall, different internal surface structures (ISS) with same materials were compared. Based on the field experiment and the proposed valuation, the dynamic heat storage-release characteristics of the north walls have been analyzed and discussed. The results showed that compared with the flat wall and the striped wall, the alveolate wall has better properties of heat storage and thermal insulation. Moreover, relative humidity in this type of greenhouse is more suitable for growing crops. The alveolate wall can improve indoor thermal environment and reduce the sensitivity to external environment. The obtained results can provide a basis for the scientific construction of the CSG north wall. It has significant potential for the area in high latitude, high altitude and long winter.

scholarly journals Determining Position of the Evaporator in a Smart Classroom Concept Using CFD Method

2021 ◽  
Vol 4 (3) ◽  
pp. 179-184
Author(s):  
Rosyida Permatasari ◽  
Muhammad Alwan Ridhoarto ◽  
Sally Cahyati ◽  
Martinus Bambang Susetyarto
Keyword(s):  
Cfd Simulation ◽  
Temperature Limit ◽  
The South ◽  
Airflow Velocity ◽  
Ansys Fluent ◽  
The North ◽  
South Wall ◽  
Fluent Software ◽  
Cfd Method ◽  
North Wall

Various, different evaporator placements in a room have produced different airflow patterns, temperature distribution, and airflow velocities. In this study, the average room temperature and airflow velocity measured at 27 points of the CFD simulation for 4 positions of the planned evaporator placements were compared to determine the most ideal position based on the comfortable temperature and the maximum airflow velocity pursuant to the SNI 03-6572-2001 recommendation. On Position 1, two evaporators were given to the west wall. Position 2, two evaporators were placed on the south wall. On Position 3, two evaporators were given to the north wall. Moreover, on Position 4, two evaporators were placed opposite to each other where an evaporator was placed on the south wall, and the other evaporator was placed on the north wall. An ANSYS Fluent software was employed to make the CFD simulation. Based on the results of the study, it was found out that Position 2 was the most ideal evaporator placement position since it met the comfortable temperature limit and has the highest number of airflow velocity points meeting the recommended maximum airflow velocity pursuant to the SNI 03-6572-2001 recommendation.

The Villa Item and a Bride's Ordeal

1929 ◽  
Vol 19 (1) ◽  
pp. 67-87 ◽  
Author(s):  
Jocelyn Toynbee
Keyword(s):  
The South ◽  
Important Paper ◽  
The North ◽  
Dwelling House ◽  
South Wall ◽  
The Subject ◽  
The One ◽  
The Individual ◽  
North Wall ◽  
The Right

The paintings in the triclinium of the Villa Item, a dwelling-house excavated in 1909 outside the Porta Ercolanese at Pompeii, have not only often been published and discussed by foreign scholars, but they have also formed the subject of an important paper in this Journal. The artistic qualities of the paintings have been ably set forth: it has been established beyond all doubt that the subject they depict is some form of Dionysiac initiation: and, of the detailed interpretations of the first seven of the individual scenes, those originally put forward by de Petra and accepted, modified or developed by Mrs. Tillyard appear, so far as they go, to be unquestionably on the right lines. A fresh study of the Villa Item frescoes would seem, however, to be justified by the fact that the majority of previous writers have confined their attention almost entirely to the first seven scenes—the three to the east of the entrance on the north wall (fig. 3), the three on the east wall and the one to the east of the window on the south wall, to which the last figure on the east wall, the winged figure with the whip, undoubtedly belongs.

scholarly journals Optimal thermal sensors placement based on indoor thermal environment characterization by using CFD model

2021 ◽  
Vol 19 (3) ◽  
pp. 628-641
Author(s):  
F Faridah ◽  
Sentagi Utami ◽  
Ressy Yanti ◽  
S Sunarno ◽  
Emilya Nurjani ◽  
...  
Keyword(s):  
Euclidean Distance ◽  
Cfd Simulation ◽  
Thermal Environment ◽  
Thermal Characteristics ◽  
Data Sets ◽  
Cfd Model ◽  
Outdoor Climate ◽  
Computational Fluid Dynamics Cfd ◽  
Maximum Root ◽  
Optimum Sensor

This paper discusses an analysis to obtain the optimal thermal sensor placement based on indoor thermal characteristics. The method relies on the Computational Fluid Dynamics (CFD) simulation by manipulating the outdoor climate and indoor air conditioning (AC) system. First, the alternative sensor's position is considered the optimum installation and the occupant's safety. Utilizing the Standardized Euclidean Distance (SED) analysis, these positions are then selected for the best position using the distribution of the thermal parameters' values data at the activity zones. Onsite measurement validated the CFD model results with the maximum root means square error, RMSE, between both data sets as 0.8°C for temperature, the relative humidity of 3.5%, and an air velocity of 0.08m/s, due to the significant effect of the building location. The Standardized Euclidean Distance (SED) analysis results are the optimum sensor positions that accurately, consistently, and have the optimum % coverage representing the thermal condition at 1,1m floor level. At the optimal positions, actual sensors are installed and proven to be valid results since sensors could detect thermal variables at the height of 1.1m with SED validation values of 2.5±0.3, 2.2±0.6, 2.0±1.1, for R15, R33, and R40, respectively.

On the Ancient Hecatompedon which occupied the Site of the Parthenon on the Acropolis of Athens

1893 ◽  
Vol 13 ◽  
pp. 32-47
Author(s):  
F. C. Penrose
Keyword(s):  
The South ◽  
Hellenic Journal ◽  
Proper Place ◽  
The North ◽  
North Wall

Dr. Dörpfeld, as was to be expected, has published in the Mittheilungen an answer to my article in the Journal of Hellenic Studies for 1891.Excepting in two corrections of detail, of which I recognize the value, and shall have occasion to make mention in the proper place, he does not appear to me to have shaken in the slightest degree the position that I took up, namely, that the great sub-basement wall under the south flank of the Parthenon was built for a temple named the Hecatompedon anterior by many years to the time of Cimon, and that the remains of large limestone architraves frieze and cornice in the north wall of the Acropolis belonged to that temple and not to the archaic temple of Athene near the Erechtheum, the discovery of which will always be associated with Dr. Dörpfeld's name. I must assume that the readers of this article will have before them both my original paper in the Hellenic Journal, already referred to, and Dr. Dörpfeld's answer in the Mittheilungen which, so far as it affects my argument, I will endeavour to answer point by point.

Six early carved stones from South Kyme Church, Lincolnshire

1923 ◽  
Vol 3 (2) ◽  
pp. 118-121
Author(s):  
A. W. Clapham
Keyword(s):  
Present Note ◽  
The South ◽  
The North ◽  
Inside Face ◽  
The Subject ◽  
North Wall ◽  
The Church

South Kyme is a village in the Kesteven division of Lincolnshire, seven miles E.N.E. of Sleaford and eighteen miles south-east of Lincoln. The church is part of the south aisle and nave of a priory of Austin Canons founded before 1169. In the course of the erection of the modern chancel, some years ago, six carved stones were dug up on the site and were subsequently built into the structure of the north wall on the inside face of it. These stones are the subject of the present note, and the photograph and drawing made for me by Mr. P. J. Kipps give all the information to be obtained by an inspection of the stones themselves, until such time as they may be taken from the wall and their reverse sides examined.

I 10, 10-11: Casa Degli Amanti

1997 ◽  
Author(s):  
Roger Ling ◽  
Paul Arthur ◽  
Georgia Clarke ◽  
Estelle Lazer ◽  
Lesley A. Ling ◽  
...  
Keyword(s):  
The Other ◽  
Central Axis ◽  
The South ◽  
The West ◽  
The North ◽  
Small Window ◽  
South West ◽  
Dining Room ◽  
North Wall ◽  
North And South

The casa degli amanti (house of the lovers), at the south-west corner of the insula, falls into two fairly distinct halves: the atrium complex, oriented on the street to the west, and the peristyle with its surrounding rooms, oriented on the street to the south and on the property boundary to the east. In the atrium complex, the atrium is misplaced to the south of the central axis, allowing space for two large rooms to the north, one of which was possibly a shop or workshop (5.50 m. × 4.70 m.), with a separate entry from the street (I 10, 10), while the other (5.80 m. × 4.50 m.), decorated with mythological wallpaintings and provided with a wide opening on to the peristyle, must have been a dining-room or oecus (room 8). Each of these had a segmental vault rising from a height of about 3.50 m. at the spring to slightly over 4 m. at the crown. In the first the vault is missing, but the holes for some of its timbers are visible in the east wall and a groove along the north wall marks the seating for the planking attached to them; at a higher level, in the north and south walls, are the remains of beam-holes for the joists of the upper floor or attic (see below). The arrangements in room 8 are now obscured by the modern vault constructed to provide a surface for the reassembled fragments of the ceiling-paintings; but the shape of the vault is confirmed by the surviving plaster of the lunettes, while a beam-hole for the lowest of the vault-timbers is visible above the corner of the western lunette in an early photograph (Superintendency neg. C 1944). The shop I 10, 10 had a small window high in the street wall to the south of Its entrance; whether there were any additional windows above the entrance, it is impossible to say, since this part of the wall is a modern reconstruction. Room 8 was lit by a splayed window cut in the angle of the vault and the eastern lunette, opening into the upper storey of the peristyle.

An Excavation at the Church of the Blackfriars, Stirling

1996 ◽  
Vol 20 (1) ◽  
pp. 103-112 ◽  
Author(s):  
R. Page ◽  
C. Page
Keyword(s):  
Thirteenth Century ◽  
The South ◽  
The North ◽  
South Wall ◽  
Bone Fragments ◽  
North Wall ◽  
The Church ◽  
Eastern Wall

Summary Part of what was suspected to be the south wall of the Blackfriars Church, destroyed in June 1559, was revealed in 1904 during the construction of the present No 64 Murray Place in Stirling. Permission was given by the present owners of the property to excavate in the garden behind the tenement to see if further traces could be found. By following mortar deposits and stone fragments the outline of a further 13.5m of robbed out south wall, an apparently semicircular apsidal eastern wall and part of the north wall were traced. The total known length of the church is therefore 27.5m, and the internal width 6.5m, with walls 1.5m thick. The greater part of a female skeleton was found just outside the south wall, accompanied by some bones of two infants, and several hundred widely scattered bone fragments. Some pottery was also found, of various dates back to about the thirteenth century.

Pompeian Paintings and their Relation to Hellenic Masterpieces, with Special Reference to Recent Discoveries

1896 ◽  
Vol 16 ◽  
pp. 143-157
Author(s):  
Talfourd Ely
Keyword(s):  
Special Reference ◽  
The South ◽  
The Third ◽  
North East ◽  
The North ◽  
North Wall

From August, 1894, till the middle of last year, the explorers of Pompeii were employed in excavating the house of A. Vettius, a house distinguished among its fellows by its sumptuous marble fittings and lavish decoration, and still more so by the splendid series of brilliant frescoes with which its walls are still adorned.According to the official plan, the position of the house should be defined thus:—Regio VI., insula 12.It lies opposite the Casa del Labirinto, close to the north-east of the Casa del Fauno, to the south of the third tower of the North Wall, counting from the Gate of Herculaneum eastwards. It possesses no tablinum, but a very fine peristyle, the Corinthian columns of which have not (as is usually the case) flutings filled for one-third of their height with stucco painted red or yellow.

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