Assessment of solar radiation on diversely oriented surfaces and optimum tilts for solar absorbers in Malaysian tropical latitude

Abstract

In this paper, the solar radiation on diversely oriented surfaces and optimum tilts for solar absorbers were assessed. The KT solar radiation model was coded in the MATLAB-based environment to compute the monthly solar radiation values. Seven-year data of monthly average daily solar radiation on a horizontal surface in Bangi, Malaysia (latitude = 3°N) were adopted as input in the simulation programme and the results were compared with the local optimum tilt angle at solar noon and other solar radiation model. The contour mappings of solar irradiation at various orientations in 12 months were presented. Results showed that the surface tilted B20°could intercept a relatively high solar intensity, which was less sensitive to the variation of azimuths with average solar insolation deviation of 11.82 %. The monthly optimum tilt angle altered throughout the year, ranging from -24°(in equator direction) to ?22°(in north direction). The estimated annual optimum slope, 1.4°facing to the equator, was close to local latitude. Based on the seasonal analysis, the northfacing surface was able to intercept higher daily average solar radiation energy compared to south-facing plane. The optimum angles for seasonal south-and north-facing surfaces were found to be 14.4°and 14.8°, respectively, with a tolerable slope deviation of ±5°from the optimal values in the present work.

Photovoltaic modules evaluation and dry-season energy yield prediction model for NEM in Malaysia

“…The days considered for the experiment were 12 th , 15 th , 16 th , 19 th , and 20 th of July corresponding to day1 to day5, respectively. Both modules were installed on fixed roof closed–rack at tilt angle of 15° (In Malaysia, 15° optimum tilt angle is found by [ 45 ]) without considering any sun tracker. Fig 3 shows the outdoor experimental setup located at UPM solar farm, coordinate 2.945° North and 101.75° East.…”

Evaluation of thermal and solar performance in atrium buildings using sequential simulation

“…Many researchers advocated that design guidelines in the hot and humid climates ought to be oriented towards reducing heat gain from the solar radiation through building envelope, particularly from the roof being the most exposed part. 6,13,16,17,19,20 Disregard for cultural or climatic conditions it has been noticed and documented in the past and of recent. 16,19,21 Many researches are being conducted on atrium design and even thermal performances in the cold regions.…”

“…11,14,15 As an example, the excessive glare and heat problem recorded in warm humid climates of Malaysia was attributed to direct application of western top lighting borrowed without consideration for climatic variations. 16 Therefore, it is crucial to establish design guidelines for the selection of efficient atrium types 2,17 for warm humid climate regions 1,3,18 right from the design stage. Designers need to be aware of both positive and negative attributes of atrium design in responding to local climates, rather than physical appeal alone.…”

“…19 Malaysia is selected as the study area owing to its climatic character coupled with the recent motive to move green. 16 Designers become more competitive in designing atria and at the same time they should consider one important issue on how to optimize the use of the solar energy in the city areas. 22 Atrium study and design becomes rampant, 6,8,13,18,23,26 where the analysis is not random; it is systematic, it involves analysis of several characteristics: roof geometrical forms and atrium shape, geographical location and skylight orientation relative to the sun, transmittance and reflectivity of the atrium roof surfaces.…”

Wireless Energy Monitoring System Of Photovoltaic Plants With Smart Anti-Theft Solution Integrated With Control Unit Of Household Electrical Consumption

“…Prieto et al [5] presented a wireless sensor network (WSN), powered with all other components from the same PV panels, for real-time monitoring of efficiency, features, failures and weaknesses from a single cell up to the whole plant. Ng et al [6] assessed the effects of the solar radiation on diversely oriented surfaces and optimum tilts for solar absorbers. Bertoldo et al [7] designed a WSN for anti-theft alarm system; each node was installed under each PV string and equipped with an accelerometer sensor for detecting a minimum displacement of PV panel from its steady position.…”