67243 cooling and heating load calculation

A.M.ATIQULLAH(Avey†gvnv¤§`
AvwZKzj¨v)
INSTRUCTOR(TECH) RAC(BÝUªv±i/AviGwm)
DHAKA POLYTECHNIC INSTITUTE,TEJGAON Dhaka.
XvKv cwj‡UKwbK BÝwUwUDU, †ZRMuvI, XvKv-
67243-Cooling and Heating Load Calculation
PresentedBy :A.M.Atiqullah INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,Dhaka-1208.
বিষয় ক োড-67243
Òতৃ তীয়-অধ্যোয়Ó

‡mvjvi wnU
K¨vjKz‡jkb m¤ú‡K©
aviYv
Aa¨vq -03
PresentedBy :A.M.AtiqullahINSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M # 01711-056403

G.O: 3. Understand the Concept of Solar Heat Load
(‡mvjvi wnU†jvW m‡¤ú‡K©aviYv)
S.O: 3.1 State the Meaning of Solar Heat.
S.O: 3.2 Describe the Heat Gain from Solar Radiation.
S.O: 3.3 Describe the Direct & Diffuse Radiation.
S.O: 3.4 Explain the Method of Calculation Solar Heat Load.

[
‡mvjvi wnU †jvW m‡¤ú‡K© aviYv t m~h© KZ©„K c„w_ex‡Z †h
Zvc mwÂZ nq, ZvB g~jZ †mvjvi wnU | mvaviYZt G ai‡bi Zvc
m~h©¨ n‡Z †Kvbiƒc gva¨g Qvov c„w_ex‡Z
¯’vbvšÍwiZ/AvewZ©Z nq|
f~-c„‡ô Rxe‡bi avivevwnKZv eRvq ivLvi Rb¨ m~h©B
GKgvÎ kw³i Drm| m~h© GKwU eø¨vK ewW (Black
Body) wn‡m‡e kw³ wewKiY K‡i Ges Gi Zj ev
mvi‡d‡mi ZvcgvÎvcÖvq 6,000 wW.‡Kjwfb(6,000°𝐊)

PresentedBy : A.M.AtiqullahINSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M # 01711-056403

m~h© n‡Z mivmwi ev †Kvbiƒc gva¨g Qvov hLb GK
Ae¯’vbn‡Z Ab¨Ae¯’v‡b †cÖwiZnq,Zv‡KB†mŠiZvc e‡j|
‡mŠiZvc wewKiY cÖwµqvq AwR©Z Zvc wewìs Gi †ÿ‡Î
†gvU Kzwjs †jv‡Wi GKwU GKKeo ai‡bi Dcv`vb MVb K‡i|
m~h© c„w_ex †_‡K cÖvq 15 †KvwU wK.wg. `y‡i Aew¯’Z|
m~‡h©i Dcwifv‡Mi ZvcgvÎv cÖvq 57,000 wW.‡m. Ges
wewKiY RwbZ Zv‡ci cwigvb 7.38 × 107 w/m2 , evsjv‡`‡k
Zv‡ci ZxeªZv eQ‡i cÖwZw`b M‡o 5000 †_‡K 6000
kcal/m2-day.PresentedBy :A.M.AtiqullahINSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M # 01711-056403

m~h© iwk¥i mv‡_ j¤^fv‡e Aew¯’Z †Kvb Z‡ji Dci cÖZ¨ÿ
†mŠiZvc/‡mvjvi wnU wewKi‡Yi cÖLiZv (Radiation) 1
watt/m2 nq Zvn‡j †mŠiZvc wewKi‡Yi GB cÖLiZv †h-‡Kvb w`‡Ki
Dcvs‡ki gvb wbY©qKivhvq| G †ÿ‡Î 3wU†Km we‡ePbv Kiv nqt-
1.†Km-1t Abyf‚wgKZ‡jiDci AvcwZZcÖZ¨ÿ†mŠiZvcwewKi‡Yij¤^Dcvsk|
2. †Km-2t LvovZ‡ji Dci AvcwZZcÖZ¨ÿ †mŠiZvc wewKi‡Yi j¤^ Dcvsk|
3. †Km-3t †njv‡bvZ‡ji Dci AvcwZZ cÖZ¨ÿ †mŠiZvc wewKi‡Yi j¤^ Dcvsk|

mivmwi m~h©iwk¥/cÖZ¨ÿ (Direct Radiation): hLb †mŠiZvc wewKi‡Yi GKwU Ask evqygÛ‡ji
gva¨‡g mivmwi m~h©iwk¥/cÖZ¨ÿfv‡e f~c„‡ô †cŠQvq ZLb Zv‡K mivmwi m~h©iwk¥ ev cÖZ¨ÿ
‡mŠiZvcwewKiYe‡j|
cwie¨vß ‡mŠiZvc wewKiY(Diffused Radiation) t †mŠiZvc wewKi‡Yi wmsnfvMB Qov‡bv-wQUv‡bv
Ae¯’vq cÖwZdwjZ n‡q gnvk~‡b¨(Space) wd‡i hvq Ges evqygÛj KZ…©K †kvwlZ nq| GB wewKi‡Yi GKwU
AskcybivqwewKiY cÖwµqvqmKjw`K †_‡Kmylgfv‡ef~c„‡ô†cŠQvq|Zv‡KBcwie¨vß wewKiYe‡j|

‡mvjvi †iwW‡qkb wfwWI†`qv Av‡Q|
3.3. Describe the direct and diffuse radiation.

1.A¨vjwUwUD‡Wi gvb wbY©‡qi m~Î t Sina = (Sind ×
SinL)+(Cosd ×CosL×Cosh)
2.m~‡h©i A¨vwRgv_ ev w`Mvsk wbY©‡qi m~Î t tanz =
𝐒𝐢𝐧𝐡
𝑺𝐢𝐧𝐋𝐜𝐨𝐬𝐡−𝐂𝐨𝐬𝐋𝐭𝐚𝐧𝐝
3.Abyf‚wgKZ‡jiDciAwc©ZcÖZ¨ÿ†mŠiZvcwewKi‡Yij¤^DcvsktIh = I Sina
4.LvovZ‡ji Dci AvcwZZ†mŠiZv‡ci wewKi‡Yi m~Ît IV = I Cosa Cosn
5.‡njv‡bvZ‡ji†ÿ‡ÎI 𝛅 = I Sina CosS ±I Cosa Cosn SinS
6.QvqviR¨vwgwZi†ÿ‡Î t (A) X = R tan(B) y = m tana= R secn tana
7.‡KvbZ‡ji Dci j¤^fv‡eAvcwZZcÖZ¨ÿ†mŠiZvc wewKi‡YigvbtI 𝜹
=I Cosi

The formulas of solar heat gain:
The general equation for the solar radiation heat balance of a
clothed man can be expressed as follows:
1.Rcl=(β1Q+β2D+β3Ref) Φ Cl…… (1)[where β1, β2, and β3 are
parameters used for the estimation of components of solar
radiation, Φ is the skin reflectance coefficient and Cl is a clothing
factor , Rcl will also be called "absorbed solar radiation".]
2. Adsorbed solar radiation for a nude man (R) can be calculated
as follows: R = 0.588 [ l.6 (Q cot h/π + D/2 + Ref/2) +0.1 (Q+D)] (1–
a)e…. (2)
3. individual contribution: R = [(Q+D) (0.07+0.54 cot h) + 0.85 ag
(Q+D)] (1–a).... (3)

Cont….
4. unclothed man: R = (Q Ash Acl + D) (1 – a)…. (4)
5. A similar formula was used by Morgan and Basket (1974):
R= (Q Ash+D Ash + Ref Ash) (1-a) (5) as well as by Tuller (1975):
6. R=(1.05 Q-Ash’+D/2+ag(Q+D)/2)(1-a) ……(6)
7. The original equations in Höppe's study:
R=(Q sin h Ash+D+Ref)(1-a) …. (7)
8.

 01.A¨vjwUwUD‡Wi gvb wbY©q t Sina=Sind× 𝐒𝐢𝐧𝐋 + 𝐂𝐨𝐬𝐝 × 𝐂𝐨𝐬𝐋 ×
𝐂𝐨𝐬𝐡
02.m~‡h©iA¨vwRgv_evw`Mskttanz =
𝐒𝐢𝐧𝐡
𝐒𝐢𝐧𝐋.𝐂𝐨𝐬𝐡−𝐂𝐨𝐬𝐋.𝐭𝐚𝐧𝐝
 03.Abyf‚wgK Z‡ji Dci Awc©Z cÖZ¨ÿ†mŠi ZvcwewKi‡Yi j¤^ Dcvsk t Ih=I.Sina
04.LvovZ‡ji Dci AvcwZZ†mŠiZv‡ciwewKi‡Yim~ÎtIv=I.Cosa.Cosn.
05.‡njv‡bvZ‡ji†ÿ‡Î tIs = I.Sina.CosS ±I.Cosa.Cosn.SinS.
06.QvqvR¨vwgwZi †ÿ‡Î t (A) X = R tan(B) y = m tana = R sec tana.
 07.‡Kvb Z‡ji Dci j¤^fv‡e AvcwZZ cÖZ¨ÿ†mŠiZvcwewKi‡Yi gvb t I 𝛅 = I.Cosi.
3.4. ‡mvjvi wnU †jvWm¤úwK©ZmyÎvejx

⇒A¨vwRgv(Azimuth)t m~h©iwk¥i AbyfzwgK Dcvsk wbw`ó †Kv‡bv †`Iqv‡ji mv‡_
j¤^fv‡e Aew¯’Z w`‡Ki mv‡_ †h †KvY Drcbœ K‡i, Zv‡K †mvjvi A¨vwRgv_ e‡j| GUv‡K Òn”
Øviv cÖKvk Kiv nq|cÖZ¨ÿwewKi‡Yi †ÿ‡Î GwU e¨envi Kivnq| GUvigvb (𝟎° − 𝟗𝟎° )nq|
⇒ wePy¨wZ ev wWwK¬‡bkb(Declination)t †WwK¬‡bkb ev
wePz¨wZ ej‡Z c„w_exi welye‡iLv ev wbiÿ †iLvi Zj(Plane) ‡_‡K
m~‡h©i †KŠwYK miY‡K wePz¨wZ ev †WwK¬‡bkb e‡j| GUv‡K Òd”
ØvivcÖKvkKivnq|
⇒Aÿvsk(Latitude)t j¨vwUwUDW ev Aÿvsk ej‡Z f‚-c„‡ôAew¯’Z †Kv‡bv ¯’v‡bi Aÿvsk ev j¨vwUwUDW
welye‡iLviwb‡PA_evDc‡i †KŠwYKmiY(S)†KeySvq|GUv‡KÒL” Øviv cÖKvkKiv nq|
⇒WvB‡i±I wWwdDR †mvjvi †iwW‡qkb(Driect & Diffuse Solar Radiation)t
WvB‡i± †mvjvi †iwW‡qkb t hLb †mŠiZvc wewKi‡Yi GKwU Ask evqygÛ‡ji gva¨‡g mivmwi
f‚-c„‡ô †cŠQvq Zv‡K WvB‡i±†mvjvi †iwW‡qkb /cÖZ¨ÿ†mvjvi †iwW‡qkb e‡j|
wWwdDR †mvjvi †iwW‡qkb t hLb †mŠiZvc wewKi‡Yi GKwU Ask evqygÛ‡ji gva¨‡g
mivmwi f‚-c„‡ô bv †cŠQvq Zv‡K wWwdDR †mvjvi †iwW‡qkb /c‡ivÿ †mvjvi †iwW‡qkb

 Chapter-3 SOLAR RADIATION
Chapter-3

QUESTION ?

3q- Aa¨v‡qi cÖkœvejx t
1. ‡mvjvi wnU ev ‡mŠi Zvc ej‡ZKx eySvq?
2. ‡mvjvi †iwW‡qk‡bi gva¨‡g Zvc e„w× eY©bv Ki?
3. WvB‡i± I wWwdDR †iwW‡qkbej‡Z Kx eySvq ?
4. †mvjvi wnU †jvW wbY©‡qic×wZ mgyn eY©bv Ki ?
Presented By : A.M.Atiqullah INSTRUCTOR(Tech) RAC DHAKA POLYTECHNIC INSTITUTE,TEJGAON I/A Dhaka-1208

01 FEBRUARY'2020Presented By : A.M.Atiqullah INSTRUCTOR(Tech)RAC
27

3.1 Draw layout of your institute library /
Refrigeration workshop/ Auditorium.
3.2 Calculate U factor for the above library/
Refrigeration workshop/ Auditorium.
3.3 Solve Problems related to transmission
load/ wall gain load.

67243 cooling and heating load calculation

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