Uqhuba idokhi nesitolo esibandayo sesikhungo sokusabalalisa impahla ezwela izinga lokushisa njengemigomo. Isicabha ngasinye esivuliwe sivumela umoya ofudumele ukungena, ilori ngalinye emugqeni liyimpahla elindile, futhi umkhiqizo kufanele uhlale phakathi kuka-2 °C no-8 °C.
Isicabha ngasinye esinabasebenzi sehlisa ilori elilodwa ngesikhathi — futhi sivumela umoya ofudumele ukungena ngenkathi sivulekile.
Ngaphakathi kwebhande lika-2–8 °C. Eliphansi linikeza isivikelo esengeziwe kodwa lisebenzisa amandla amaningi.
Ama-compressor amabili, ngalinye lipholisa i-40 kW.
Anciphisa ukungena komoya ofudumele ngezicabha ezivuliwe; amafeni asebenzisa amandla athile.
Ihambisa ilori elinegatsha lokubanda elehlulekile ekuqaleni komugqa.
| Umoya wegumbi elibandayo | 5.0 °C |
|---|---|
| Isikhathi sabasebenzi (amahora-sicabha anabasebenzi) | 0.5 h |
| Amalori alindile | 0 |
| Ukusetshenziswa kwedokhi | 0 % |
| Amandla okupholisa | 0.0 kW |
33 °C ngaphandle, amalori efika ngokungaguquki, izicabha ezine zivuliwe zokwehlisa. Elilodwa lama-compressor amabili seliqala ukuhluleka. Gcina imigomo ngaphakathi kuka-2–8 °C.
Emahoreni amane osuku lokusebenza lwamahora angu-14, kuqala ukuphakama kwamaholidi: amahora ayisikhombisa, kufika amalori angu-7 ngehora ngezikhathi ezibhukiwe — ngaphezu kokuphindwe kabili kwangu-3 ojwayelekile — futhi izicabha ezintathu kuphela ezinabasebenzi. Abashayeli ababhukile banezikhathi ezibekiwe, ngakho ukulinda okumaphakathi kufanele kuhlale kungu-20 imizuzu noma ngaphansi. Amaqembu engeziwe edokhi alindile ukubizwa, kodwa isabelomali sesikhathi esengeziwe sikhokhela amahora-sicabha anabasebenzi angu-68 osukwini. Vula izicabha ezanele ngesikhathi — ngaphandle kokupheka igumbi elibandayo intambama engu-33 °C.
Amalori ayishumi nambili asevele alindile futhi izicabha ezimbili kuphela ezinabasebenzi. Ngemva kwalokho iyunithi yokupholisa yelori elisemuva emugqeni iyafa — ekushiseni okungu-35 °C.
Wonke ubudlelwano isilingisi esibusebenzisayo, nomthombo wabo. Izinto ezihlala zingashintshi ezimakwe njengokuthathelwa yizilinganiso zesibonelo.
C · dT/dt = UA·(T_out − T) + Q_door − Q_refrig[3][2]Okuthathelwa: isisindo sokushisa, ukuqhutshwa kodonga nesicabha, usayizi we-compressor nesikhathi sokusebenzela yizinani zesibonelo.Q_door = n_open · 0.6 · 1.2 kW/K · (T_out − T) · (1 − 0.7·curtain)[2]Okuthathelwa: isisindo sokushisa, ukuqhutshwa kodonga nesicabha, usayizi we-compressor nesikhathi sokusebenzela yizinani zesibonelo.COP = 0.45 · T_evap / (T_cond − T_evap) [K][4]T_product(t+Δt) = T_room + (T_product − T_room)·e^(−Δt/2h)[3]excursion = Σ max(0, T − 8, 2 − T) · Δt [°C·h][1]cold room 60 MJ/K, walls 0.6 kW/K · door open 60 % of unloading · air curtain −70 % infiltration, +3 kW fan per busy door · 2 × 40 kW compressors, −1 %/K above 32 °C · 4 kW per busy door (levellers, lights) · failed reefer τ = 3 h · scenario site settings: cold-room pre-alarm 7 °C, overtime budget 68 door-hours per 14 h day · booked trucks miss 5 % of slots · unloading Erlang-2Okuthathelwa: isisindo sokushisa, ukuqhutshwa kodonga nesicabha, usayizi we-compressor nesikhathi sokusebenzela yizinani zesibonelo.arrivals ~ Poisson(λΔt) + booked slots (5 % no-show), service ~ Erlang-2 (mean 45 min), c staffed doors; X = n_busy / 45 min (smoothed, τ = 1 h); W_q = L_q / X[6][5]crew time = Σ c_staffed · Δt [door-hours]Ukungahleliwe: i-generator ye-mulberry32 enembewu; ukusabalalisa okusetshenzisiwe — uniform, exponential (inverse CDF), normal (Box–Muller), Poisson (Knuth). Imbewu iyabonisa futhi ingabelwana.
Imodeli yemfundo — hhayi yezinqumo zokusebenza. Izindawo zangempela zilinganisa yonke into ehlala ingashintshi kumishini nedatha yazo.