v ù n g t r o n g c ả n ă m c h ứ a d ự n g t h ê m m ộ t b i ê n n ữ a
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S U M M A R YE m p i r i c a l c o r r e l a t i o n s ( o r c o m p u t i n g d a l l y d l ( ( u s » E m p i r i c a l c o r r e l a t i o n s ( o r c o m p u t i n g d a l l y d l ( ( u s » r a d i a t i o n f r o m g l o b a l r a d i a l l o n a n d p e r c e n t p o s s i b l e s u n s h i n e T h e r e are m a n y lo c a tio n s w h e r e w e d o n ’t h a v e m e a s u r e d d a la o n d if fu s e r a d ia t io n In th is p a p e r we d e v e l o p c o rr e la tio n s (or c o m p u t i n g d a ily d if f u s e r a d ia n t io n o n a h o r iz o n ta l s u r fa c e In H a n o i a n d H a ip h o n g , fr om th e m e a s u r e d d a t a o f g l o b a l s o la r r a d ia n ! e x p o s u r e a n d r e la tiv e s u n - . h ln e d u r a t i o n O n e u n iq u e c o r r e la tio n for e a c h l o c a t i o n a p p l i c a b l e th r o u g h all th e y e a r is o b t a i n e d f r o m 12 c o r r e l a t i o n s lo r e a c h m o n th by e x a m i n i n g Ih e b e h a v i o u r s of (he r e g r e s s io n c o e ffic ie n ts . N ỵ à \ n h ậ n b à i 2 0 - 11 - 2 0 0 2 1 rtrờiiỊỊ Util hụ( K h u a h ọ c I u n h i ỉ n
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A B S T R A C T
1. P roject title: Study o f Correlationship between the Daily Radianl
Exposures o f the Diffuse, Global Solar Radiation and the Sunshine Duration in ViCt
Nam
2. C ode num ber: QT.01.23
3. P r o j e c t L e a d e r : Assoc. Prof. Dr. Ngtiyễn Hướng Điền
4. M em bers:
B.Sc Nguyen Dang Quang
5. Aim s and contents o f project:
1) Aims:
- Determi ning empirical formulas for calculating daily diffuse solar radiant
e xpos ur e from the global one anti relative sunshine duration on base o f ihc
measured dala o f Ihese for diverse regions of Vietnam.
- Estimating Ihe accuracy and usability of the obtained formulas
2) Contents:
a) A nalysing qualitative correlation between the diffuse, global solar
radiations and sunshine duration
b) Studying the methods of determining quantitative correlations between them
cr) Colecting measured data of diffuse, global solar radiant exposure and
relative sunshi ne duration s/s0 at diverse meteorological stations in
Vietnam.
d) Programming and running the programs for determining empirical
f ormulas what connect the three studied quantities (needier for every region and the whole territory of Vietnam.
c) Remarking the results, estimating the accuracy and Iisiihilily n| Ihcobtained formulas obtained formulas
6. Results:
d e pe nde nc e o f the rillio between the (J H ĩ I \ (Jiliusc ;ui(J ylohnl soliir radiant exposure on atmospheric transmilancc o f global radiation and relative sunshine duration may be considered linear.
- 92 empirical formulas were determined ill divorce cases (usable for everymonth or any lime o f the year ill (liccrve rc.einnv) llic f o r m u l a for every