Kai ne ke gudanar da tashar saukewa da ɗakin sanyi na cibiyar rarraba kaya masu saurin kula da zafi kamar alluran rigakafi. Kowace ƙofa da ke buɗe tana shigar da iska mai ɗumi, kowace babbar mota a layi kaya ce ke jira, kuma dole kayan su kasance tsakanin 2 °C da 8 °C.
Kowace ƙofa mai ma'aikata tana sauke babbar mota ɗaya a lokaci guda — kuma tana barin iska mai ɗumi ta shiga yayin da take buɗe.
A cikin kewayon 2–8 °C. Ƙasa yana ba da ƙarin gibi amma yana amfani da ƙarin makamashi.
Compressors biyu, kowanne yana sanyaya 40 kW.
Yana rage shigowar iska mai ɗumi ta ƙofofi da ke buɗe; fanfunan suna amfani da ɗan wuta.
Yana kai motar da na'urar sanyaya ta lalace gaban layi.
| Iskar ɗakin sanyi | 5.0 °C |
|---|---|
| Lokacin ma'aikata (sa'o'in ƙofa da ma'aikata) | 0.5 h |
| Manyan motoci masu jira | 0 |
| Amfani da tashar saukewa | 0 % |
| Wutar sanyaya | 0.0 kW |
33 °C a waje, manyan motoci suna zuwa a tsaye, ƙofofi huɗu a buɗe don saukewa. Ɗaya daga cikin compressors biyu zai lalace. Ka riƙe alluran rigakafi a cikin 2–8 °C.
Sa'o'i huɗu cikin ranar aiki ta sa'o'i 14, kololuwar biki ta fara: na sa'o'i bakwai, manyan motoci 7 a awa suna zuwa a lokutan alƙawari — fiye da ninki biyu na 3 da aka saba — kuma ƙofofi uku ne kawai ke da ma'aikata. Direbobin da suka yi alƙawari suna da lokutan alƙawari, don haka matsakaicin jira dole ya kasance minti 20 ko ƙasa da haka. Akwai ƙarin ma'aikatan tashar saukewa da za a iya kira, amma kasafin ƙarin lokaci yana ɗaukar sa'o'in ƙofa 68 da ma'aikata na ranar. Ka buɗe isassun ƙofofi a kan lokaci — ba tare da dafa ɗakin sanyi a yammacin 33 °C ba.
Manyan motoci goma sha biyu suna jira tuni kuma ƙofofi biyu ne kawai ke da ma'aikata. Sai na'urar sanyaya ta wata babbar mota da ke ƙarshen layi ta mutu — a zafin 35 °C.
Kowace alaƙa da na'urar koyi ke amfani da ita, tare da tushenta. Ƙayyadaddun ƙimomin da aka yi wa alama a matsayin zato daidaitawa ne na misali.
C · dT/dt = UA·(T_out − T) + Q_door − Q_refrig[3][2]Zato: nauyin zafi, jagorancin bango da ƙofa, girman compressor da lokacin hidima ƙimomi ne na misali.Q_door = n_open · 0.6 · 1.2 kW/K · (T_out − T) · (1 − 0.7·curtain)[2]Zato: nauyin zafi, jagorancin bango da ƙofa, girman compressor da lokacin hidima ƙimomi ne na misali.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-2Zato: nauyin zafi, jagorancin bango da ƙofa, girman compressor da lokacin hidima ƙimomi ne na misali.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]Rashin tsari: mai samar da mulberry32 mai iri; rarrabawar da aka yi amfani da su — uniform, exponential (inverse CDF), normal (Box–Muller), Poisson (Knuth). Ana nuna iri kuma ana iya raba shi.
Samfurin ilimi — ba don yanke shawarar aiki ba. Wuraren gaske suna daidaita kowace ƙayyadaddiyar ƙima da kayan aiki da bayanansu.