1. Pawg ntawm tshav kub thauj khoom
Cov tshuab tau cuam tshuam los ntawm ntau qhov chaw ntawm kub nce:
Kev sib kis los ntawm lub hnab ntawv sau- Conduction los ntawm cov phab ntsa, ru tsev, pem teb.
Hnub ci hluav taws xob- Los ntawm lub ru tsev thiab lub qhov rais (yog muaj).
Cua infiltration thiab dim pa- Sov huab cua sov nkag los ntawm qhov rooj lossis dej xau.
Cov khoom lag luam- Tshav kub tawm ntawm cov khoom txias lossis khov.
Teeb Hluav Taws Xob Hluav Taws Xob- Tshav kub tso tawm sab hauv cov chaw ua tub yees.
NYOB TEEB- Cov cua sov los ntawm cov neeg ua haujlwm hauv chav.
Cov txheej txheem thiab cov khoom siv- MOTORS, conveyors, twj, thiab lwm yam.
Cov Nyiaj Ntxiv Ntxiv- Defrosing, nquag qhib qhov rooj qhib, thiab kev nyab xeeb npoo.
2. Cov Qauv Qauv
Kev Conduction (Los Ntawm Ntsa / Ru Tsev / Pem Teb):
Qcond=u⋅a⋅tq_ {cain}= u \\ cdot=u⋅a⋅⋅t
UUU: Tshaj tawm cua sov hloov ua coefficients (w / mayin ·
AAA: Thaj Chaw Thaj Chaw (M²)
ΔT \\ Delta TΔT: Qhov sib txawv kub (K)
Cua infiltration / cua:
= Ach⋅v / 3600⋅ρ \\}}}}}}}}} \\ dot m \\ c_p \\ cdot \\ delta tqinf {}}}} haiv ⋅⋅t
ACHACHCHACH: Huab cua Hloov Pauv (1 / h)
VVV: Chav Ntim (MLP)
ρ 1 rhoρ: huab cua ntom ntom (kg / mp, kwv yees . 1.2)
CPC_PCP: Cov cua sov tshwj xeeb ntawm huab cua (≈1.005 KJ / KGAYA
Cov Khoom Txias Thauj:
= m⋅cpprod⋅⋅t3600q_ {} {\\ cdot yog \\ delta t {}}} m⋅cpprod ⋅⋅t
Mmm: Khoom Siv Loj (kg)
cpprodc_p ^ {{prod} CPPROD: tshwj xeeb kub ntawm cov khoom (KJ / KGACH KN)
ΔT \\ delta tΔt: kub tso (k)
Teeb pom kev zoo thiab khoom siv:
Tsuas yog ntxiv lub rated zog hauv KW.
Nyob (tib neeg):
Xav paub cov cua sov rau ib tus neeg ≈ 70-100 W.
Tag Nrho Load nrog Kev Ruaj Ntseg:
QTotal=σqiq_ {}}}}}}}}} {tag nrho} ({1 + \\ ntawv {npoo}) Qdesign {{} ltoVal ⋅ ({{12} npoo |
Ntug feem ntau 5-15%.
3. Kauj {- ntawm -} theem piv txwv
Tsim Tsim Kho (Piv Txwv):
Chav Qhov Ntev: 6.0 × 4.0 m → ntim {{} m³
Sab hauv temp: 2 Qib
Sab Nrauv Temp: 30 Degree
U {- qhov muaj nuj nqis: phab ntsa 0.5, lub tsev 0.3, pem teb 0.4 w / m²k
Cua hloov: 0.5 ach
Khoom: 200 kg, txias los ntawm 20℃rau 2 degree, cp =3.5} kj} kj} kj} kay / kg} k
Teeb Pom Kev: 200 W, Khoom: 500 w
Kev Khej: 2 tus neeg × 70 th paub thaum tshav kub kub
Kev Ruaj Ntseg: 10%
Suav:
Chaw:
Phab Ntsa: 2 (L + W) h =60 m22 (L + W) h}} \\ m²2} m2
Lub ru tsev=teb=6}}} {{{{{6} m2
ΔT:
{=30} - {{{k} delta t {{}} {4 k
Conduction Loads:
Phab ntsa: 0.5 × 60 {{{{{2} ×} kw0.5 {{{{{{{{{mw
Ru: 0.3 × 24 × {{{{{} {{{{{{{{{{{{{{mw
Pem Teb: 0.4 × 24 {{{{{{} {{{{{{{{{{{{{{11 kw
Infiltration:
ment =0.5 × × 72/3600}}}} {} {{{{kg / s
Qinf =0.012 × 1.005 × 28 ×}}}}}}}}}}} × 1.005 × 28≈0.338 kw
Khoom Thauj Khoom:
=200 × 3.}} Kuv}}}}}} × × × ×} {{13 kw
Teeb pom kev zoo & khoom siv:
Teeb Pom Kev: 0.200 KW
Khoom siv: 0.500 kw
Kev nyob:
2 × 70W =0.140 hauv kg2 × li 70} {} kw2 {{8} kw
Tag nrho ua ntej npoo:
QTotal =0.840+0.202+0.269+0.338+3.5+0.200+0.500+0.140=5.989 kwq_ {tag nrho}=0.840 + 0.202 + 0.269 + 0.338 + 3.5 + 0.200 + 0.500 + 0.140=5.989 \\ kwqtotal {}} kw
Nrog npoo (10%):
Qdesign =5.989 × {1.10=6.59 {{{{} {{6 {6}1.10=6.59 kw
Qhov tshwm sim:Xav tau cua txias ≈6.6 KW.
4. Cov tswv yim tswv yim
Txhua zaus yuav tsum siv cov chav thiab hloov W rau KW rau kev qhia.
Xaiv qhov tseeb u {- qhov tseem ceeb los ntawm cov ntaub ntawv tsim kho.
Xav txog cov khoom -}} kev kub muaj peev xwm (txiv hmab txiv ntoo, nqaij, nqaij ntses me me).
Ntxiv cov nyiaj pub rau qhov rooj qhib, defrosting, thiab kev ua haujlwm tsis zoo.
Siv cov cuab yeej software rau loj - nplai lossis ntau- chav ua haujlwm.
Txheeb xyuas nrog cov kev ntsuas hauv kev ntsuas tom qab kev ua haujlwm thiab kho yog tias xav tau.
Tag
Tshav kub thauj cov kev xam yog cov pob zeb ntawm kev tsim tub yees. Los ntawm kev txiav txim siab conduction, in infiltration, khoom txias, cov tshuab hluav taws xob kom muaj kev nyab xeeb, thiab ntxiv cov khoom siv hluav taws xob kom raug kom yog. Ib qho zoo - xam load ensures obj txuag thiab txhim khu kev qha rau cov chav txias, cov khoom noj hauv tub yees.
