Ɔhyew ho nhyehyɛe wɔabɔnten kabinet-type batere ahoɔden akoraeɛ nhyehyɛeɛgyina hɔ ma saa mfiridwuma ho nteɛso ahorow no mu biako a nsonsonoe a ɛda adesua nhoma mu nsusuwii ne afuw mu nokwasɛm ntam no trɛw araa ma ebetumi amene adwuma no sikasɛm nhyehyɛe nyinaa. Electrochemical suban a lithium iron phosphate cells-mprempren chemistry titiriw wɔ stationary storage applications-mu no, ɔhyew a egyina so a adetɔ akuw dodow no ara bu no sɛ ase hɔ nsɛm sen sɛ ɛbɛyɛ nhyehyɛe anohyeto titiriw. Operating envelopes of 15℃to 35℃sound generous on paper until you’re commissioning a 215kWh cabinet in Phoenix during July, hwɛ sɛnea BMS no throttle w’agyapade foforo a ɛhyerɛn no ma ɛyɛ 40% tumi efisɛ obi nnu HVAC no kɛse 2kW.
Ɔhyew Ho Ɔhaw a Obiara Mpɛ sɛ Ɔka Ho Nsusuwii
Nokware a ɛnyɛ dɛ a nnwuma no glosses wɔ so ni: LFP batere mfa wo sika a wubenya ho nkɔmhyɛ ho. Wɔn ho hia wɔn sɛ wɔbɛtra digrii 20 kosi digrii 30 ntam . Fa wo ho kɔ saa nnwontofo kuw no akyi, na wufi ase tua mfɛntom a wɔaka abom wɔ nneɛma a wɔsɛe no ho.
Akontaabu no yɛ atirimɔdensɛm. Wɔ digrii 10 biara a ɛboro digrii 25 so no, kyinhyia nkwa so tew bɛyɛ fã. Cabinet a ɛretu mmirika daa wɔ 45℃-a ɛtaa si sen sɛnea obiara gye tom wɔ anhweatam so installations-bɛbɔ capacity fade thresholds wɔ mfe abiɛsa mu sen sɛ ɛbɛyɛ awotwe. Ɛno nyɛ rounding error. Ɛno yɛ agyapade a ɛda hɔ.
Na ɛyɛ kɛse wɔ nea ɛtra so no mu. LFP chemistry starts exhibiting measurably increased internal resistance below 0℃, a ɛkyerɛ sɛ wo awɔw bere mu anɔpa nsu a ɛtwetwe nsu no nte sɛ wo awɔw bere mu awiabere curves no koraa. Charging ase freezing de asiane ba lithium plating wɔ anode-daa, a wontumi nsakra no sɛe a reconditioning dodow biara rensiesie. Ɛsɛ sɛ BMS no siw eyi ano, nanso mahu units a wɔde amena a wɔde low-temperature cutoffs ahyɛ -10℃bere a cell manufacturer no datasheet no kyerɛɛ pefee sɛ 0℃. Obiara ankyere no kosii awɔw bere a ɛto so abiɛsa no.
Air Cooling: Default a Ɛnsɛ sɛ Ɛyɛ Default
C&I kabinet nhyehyɛe dodow no ara de hyɛn a wɔhyɛ-mframa thermal management efisɛ ne bo yɛ mmerɛw. A 3kW to 5kW packaged air conditioner bolted to the cabinet roof, binom ductwork, ebia filter a obiara rensesa da-ayɛ. BOM ka a wɔbɔ nyinaa ma HVAC nhyehyɛe no: ebia $2,500.
Mframa a wɔde yɛ adwuma no tra soro esiane nneɛma a mfaso wɔ so nti. Ɔhyew kɔ soro, enti sɛ wobɔ mmɔden sɛ wubefi ase ayɛ nwini a, woreko atia thermodynamics. Nea ɛho hia kɛse no, ɛsɛ sɛ mfiridwumayɛfo a wɔbɛpɛ sɛ wɔnyɛ contortionist nneyɛe no tumi kɔ filter access ne refrigerant service ports. Bere bi mekɔhwɛɛ beae bi a wɔde kabinet AC no si nkotodwe so wɔ akyi panel no so. Service tech no kyerɛɛ me ne invoices-30% a ɛkorɔn adwumayɛfoɔ ka wɔ frɛ biara ho esiane sɛ ɛyɛ den sɛ wobɛkɔ hɔ nti.
Mframa a ɛma onwini yɛ adwuma. Ɛnyɛ ɛno ne asɛm no. Asɛm no ne sɛ ɛyɛ adwuma kosi sɛ ɛnyɛ, na sɛ edi nkogu a, edi nkogu wɔ akwan horow so a ɛsen fa wo sikasɛm mu adwumayɛ mu.
Ɔhyew a ɛkɔ soro no ne owudifo a ahintaw. Wɔ mframa-nwini kabinet a wɔtaa de di dwuma mu no, wubehu digrii 8 kosi digrii 12 deltas wɔ inlet-side battery modules ne exhaust-side modules ntam. Ebia nkwammoaa a ɛbɛn AC a wɔde fa mu no te digrii 22 a ahotɔ wom bere a nea ɛwɔ mframa kwan no awiei koraa no reto digrii 34 . Cabinet koro, bere koro mu, onyin dodow a ɛsono koraa. Mfeɛ anum akyi no, woanya module bi wɔ 85% SOH na afoforo nso wɔ 65% SOH. Good luck sɛ wobɛkyerɛkyerɛ mu akyerɛ wo O&M kuw no bere a module ahorow a asɛe no fi ase to anohyeto-system tumi nyinaa ano.
NREL data a ɛfa eyi ho no yɛ fɛ damning. Lithium-ion nkwammoaa a ɛyɛ adwuma wɔ digrii 30 no hwere wɔn nkwa nna bɛyɛ 20% sɛ wɔde toto nkwammoaa a wɔde digrii 20 toto ho a . At 40℃, worehwɛ 40% nkwa nna so tew. Wɔ 45℃-a ɛyɛ nea wobetumi ayɛ koraa wɔ mframa-cooled cabinet a wɔanhyehyɛ no yiye mu wɔ awɔw bere mu awiabere peak-shaving cycle-woatwitwa battery nkwa mu abien. Eyinom nyɛ akontaabu a wɔde nsusuwii hunu. Wɔnya fi onyin ho nhwehwɛmu a wɔayɛ no ntɛmntɛm mu na wɔagye atom de atoto afuw mu nsɛm ho.
Nsuo a Ɛma Onwini: Adwumayɛ a Ɛyɛ Pa, Tiyɛ a Ɛsono
Nnwuma no pivot a ɛkɔ nsu-cooled cabinet nhyehyɛe ahorow no ayɛ ntɛmntɛm na ne fã kɛse no ara fata. Nsu-glycol afrafra a ɛnam mprɛte a ɛyɛ nwini a wɔde abata batere module ho no betumi anya ɔhyew a ɛyɛ pɛ wɔ ±2 digrii kosi ±3 digrii mu wɔ pack no nyinaa mu. Ɛno yɛ nsakraeɛ nkɔsoɔ sen mframa a ɛyɛ nwini ±6 digrii kɔsi ±8 digrii (na ɛtaa yɛ bɔne).
Abɔde mu nneɛma ho nimdeɛ yɛ tẽẽ: ɔhyew pɔtee a nsu tumi tumi yɛ no bɛyɛ mframa de mmɔho anan. Wubetumi de ɔhyew ahoɔden dodow koro no ara akɔ baabiara a nsu a ɛsen no sua koraa. Mprɛte a ɛyɛ nwini no ne module no ani di nkitaho tẽẽ, na eyi convective boundary layer losses a ɛto mframa-cooled designs ano hye no fi hɔ. Biribiara a ɛfa nsu a ɛma onwini ho no korɔn wɔ thermodynamically.
Enti dɛn nti na wɔmfa cabinet nsu biara-nwini?
Ɛka a wɔbɔ, ɛda adi sɛ. Nsuo a ɛyɛ hyew ho nhyehyɛeɛ-chiller unit, pɔmpɛ, awɔw mprɛte, nsuo ho nhama, glycol fill, expansion tank, leak detection-de $8,000 kɔsi $15,000 ka kabinet ka ho a egyina tumi so. Wɔ 100kWh nhyehyɛe a ne nyinaa yɛ nea wɔde ahyɛ mu no, ebia $80,000, ɛno yɛ ɔha biara mu nkɔanim a ntease wom.
Nanso twentwɛn a wɔtwentwɛn wɔn nan ase ankasa no fi oprehyɛn ho dadwen mu. Nsu a ɛbɛn high-voltage DC electronics ma nkurɔfo ho yeraw wɔn, na ɛnyɛ nea ntease nnim. Glycol a ɛtwetwe wɔ kabinet a ahoɔden wom mu no de huammɔdi akwan horow a mframa a ɛma onwini nni bi kɛkɛ ba. Nsuo-nwini nhyehyɛɛ a ɛyɛ papa no de dielectric nsu di dwuma anaasɛ honam fam tew onwini loop no fi anyinam ahoɔden dan no mu, nanso mahwɛ nhyehyɛe ahorow a awɔw mprɛte manifolds no tu mmirika tẽẽ wɔ BMS boards no atifi. One fitting failure na worehwɛ asɛm kɛse bi a esii ho nhwehwɛmu.
Adesoa a wɔde siesie nneɛma nso kɔ soro. Pɔmpɛ ahorow no di huammɔ. Glycol sɛe na ɛsɛ sɛ wɔsesa bere ne bere mu. Chillers wɔ compressor ahorow a ɛyɛ mmerɛw. Mfutuma siw mframa a wɔde yiyi condenser coil ahorow so no ano, na obiara nhwɛ mu efisɛ nhyehyɛe no te gyaade a wɔabɔ ho ban a ebia wɔn a wosiesie no kɔsra hɔ mprenu afe biara. Nsuo a ɛma onwini a wɔanhwɛ so yie no rentumi nyɛ adwuma yie wɔ asram 18 mu na adi nkogu wɔ asram 36 mu.
Heat Exchangers: Mfinimfini Kwan a Ɛnyɛ
Mframa-kɔ-mframa mu ɔhyew nsakrae ahorow da adi wɔ nkyerɛkyerɛmu ahorow mu bere nyinaa, mpɛn pii no wɔde si hɔ sɛ "ahotoso kɛse" a wɔde si frigye-gyinaso onwini ananmu. Pitch no kɔ biribi te sɛ eyi: compressor biara nni hɔ, refrigerant charge biara nni hɔ, HVAC controls a ɛyɛ den biara nni hɔ-ɔhyew paipu anaa thermosyphon a ɛde kabinet ɔhyew kɔ mframa a atwa yɛn ho ahyia mu kɛkɛ.
Ɔhaw ketewaa biako wɔ hɔ. Ɔhyew sesafo betumi apo ɔhyew bere a ɔhyew a ɛwɔ baabi a ɛwɔ no sua sen ɔhyew a wɔde asi wɔn ani so wɔ kabinet mu nkutoo. Sɛ wopɛ sɛ wokura digrii 25 mu wɔ kabinet no mu na ɛyɛ digrii 35 wɔ abɔnten a, mprempren wo ɔhyew sesa no reyɛ adwuma sɛ ɔhyew bridge a ne bo yɛ den wɔ ɔkwan a ɛnteɛ so.
Eyi te sɛ nea ɛda adi pefee bere a wɔaka no pefee no, nanso mahu nnwuma a ɛwɔ Amerika Kesee Fam Atɔe spec'd ne ɔhyew-exchanger-nwini nkutoo efisɛ adetɔn mfiridwumayɛfo no kyerɛɛ graph a ɛkyerɛ "afe afe ɔhyew a ɛkɔ soro" a ɛyɛ mmerɛw sɛ ɛmaa 45℃awiabere peaks no yɛɛ mmerɛw yiye ma ɛbɛyɛɛ nea wotumi di ho dwuma yiye-a ɛte sɛ 28℃average. Nhyehyɛe no yɛɛ adwuma yiye fi October kosi April. May kosi September no, na batere no de awia hann nnɔnhwerew dodow no ara di dwuma wɔ ɔhyew a ano yɛ den mu.
Ntease wɔ ɔhyew sesa nneɛma mu wɔ wim tebea pɔtee bi mu-Scandinavia, Germany atifi fam, Pacific Atifi Atɔe, baabiara a atwa yɛn ho ahyia hyew no tra ase wɔ wo setpoint ase a wotumi de ho to so. Sɛ wɔde AC unit ketewa bi a wɔde ka ho ma nna kakraa bi a ɛyɛ hyew no ka ho a, wobetumi atew afe afe onwini ahoɔden a wɔde di dwuma no so 60% anaa nea ɛboro saa. Nanso wɔnyɛ amansan nyinaa ano aduru, na adetɔnfo a wɔde kyerɛ sɛ ɛte saa no reyɛ wɔn adetɔfo bɔne.
Adesoa a Ɛyɛ Parasitic a Obiara Nnyɛ Budget Ma
Cabinet HVAC nhyehyɛe ahorow no di anyinam ahoɔden. Eyi nyɛ asɛmpa. Nea ɛyɛ amanneɛbɔ-ma wɔn a wɔyɛ adwuma no pii, ɛda adi sɛ-ne anyinam ahoɔden dodow a wɔde di dwuma ne sɛnea saa a wɔde di dwuma no ka adwumayɛ ho asɛm no kɛse.
Field data a ɛfiri installations a ɛwɔ wimu tebea ahodoɔ mu kyerɛ parasitic thermal management loads a ɛfiri 8% wɔ battery throughput nyinaa mu wɔ wim tebea a ɛyɛ mmerɛ mu kɔsi 34% wɔ mmeaeɛ a ɛyɛ den. Ma ɛno nkɔ mu Wɔ subarctic installation a ɛho hia sɛ wɔde ɔhyew kɛse wɔ awɔw bere mu mu no, ahoɔden a wɔkora so wɔ batere no mu bɛboro nkyem abiɛsa mu biako kɔ so ma saa batere koro no ara kɔ so yɛ hyew a wogye tom.
Nsusuiɛ a ɛwɔ sikasɛm mu nhwɛsoɔ dodoɔ no ara mu no yɛ 2% kɔsi 3% adesoa a ɛboa. Saa adwene no yɛ mfomso, mpɛn pii no ɛyɛ nea ɛkɔ soro nnidiso nnidiso wɔ deployments a ɛyɛ den mu.
Awɔw bere yɛ bere a ɛyɛ mmerɛw ankasa wɔ adesoa a ɛyɛ mmoawa a wɔsɛe nnɔbae ho adwene mu wɔ mmeae dodow no ara. Yiw, woreyɛ AC no bere nyinaa, nanso worepo ɔhyew a ɛkɔ mframa a ɛboro wo setpoint no so digrii 10 kosi 20 pɛ mu. Awɔw bere mu wɔ mmeae a awɔw wom no ne baabi a nneɛma bo yɛ den. Woreyɛ resistance heaters, na thermodynamic trick biara nni hɔ a ɛbɛma anyinam ahoɔden resistance heaters ayɛ adwuma yiye. Ɔhyew watt biara a wuhia no bɔ wo ka anyinam ahoɔden watt biako pɛpɛɛpɛ-ne tumi nsakrae biara a ɛtra batere ne ɔhyew afiri no ntam a ɛnyɛ adwuma yiye.
PCS no ma ɔhyew a wɔsɛe no ba, na kabinet nhyehyɛe a nyansa wom kyere no de di awɔw bere mu ɔhyew ho dwuma. Sɛ PCS no te thermal envelope no mu a, ne 3% kɔsi 5% nsakraeɛ a ɛyera no bɛyɛ "free" ɔhyew wɔ asram a awɔw wom mu. Sɛ wɔde si abɔnten-ɛtaa ba wɔ split-system designs mu a battery cabinet ne power electronics cabinet yɛ units a ɛsono emu biara-woatow ɔhyew ahoɔden a mfaso wɔ so agu na afei ɛsɛ sɛ wode battery-powered resistance heating si ananmu.
Thermal Runaway: Ehu a Ɛhyehyɛ Biribiara
LFP nni ɔhyew guankɔ su a ɛwɔ NMC anaa NCA nnuruyɛ mu no. Eyi yɛ nokware. Iron phosphate cathode nhyehyɛe no nnyi oxygen bere a wɔayɛ no hyew no, enti wunnya cascading exothermic decomposition a ɛma cobalt-based chemistries yɛ asiane kɛse no.
Nanso "ahobammɔ" nyɛ "ahobammɔ," na nnwuma no ahotɔ a ɛrenya nkɔanim wɔ LFP ɔhyew nneyɛe ho no afi ase reda adi wɔ asɛm a esii ho amanneɛbɔ mu.
LFP thermal runaway fi ase wɔ bɛyɛ 270℃-a ɛkorɔn sen 150℃to 200℃threshold ma NMC. Ɔhyew a ɛkɔ soro bere a obi a ɔreguan no yɛ bɛyɛ digrii 1.5 wɔ simma biara mu, sɛ wɔde toto digrii ɔhaha pii a ɛkɔ soro wɔ simma biara mu wɔ cobalt nnuru ho a. Eyi ma wunya bere pii de yɛ ho biribi na ɛma ɛnyɛ den koraa sɛ ɛbɛtrɛw nkwammoaa ntam.
Nea wɔtaa yi fi ahobammɔ ho nkɔmmɔbɔ no mu ne sɛ LFP nkwammoaa da so ara gyae mframa a ɛyɛ hyew ne awuduru bere a adi nkogu no. Hydrogen, carbon monoxide, hydrocarbons, ne hydrogen fluoride nyinaa pue wɔ off-gas afrafra no mu. Dodow no sua sen NMC, na nea woyi fi mu no yɛ brɛoo, nanso kabinet a LFP nkwammoaa a ɛma mframa fa mu ahyɛ mu ma wɔ baabi a wɔato mu no da so ara yɛ asiane kɛse.
Nnansa yi nhwehwɛmu a efi Sheffield Sukuupɔn mu no hui sɛ LFP batere ahorow no kyerɛ ogya ho asiane kɛse ankasa wɔ tebea horow bi mu efisɛ off-gas afrafra-bere a ɛnyɛ kɛse pii-wɔ auto{3}}ignition threshold a ɛba fam. Krataa mũ no nyinaa yɛ nuanced na ɛnka sɛ LFP yɛ asiane kɛse wɔ ne nyinaa mu, nanso ɛyɛ puncture aguadi mu asɛm a ɛrekɔ so kɛse sɛ LFP "ntumi nnye ogya."
Ne nyinaa ma yɛsan kɔ ɔhyew a wɔde di dwuma so. Ɔkwan a eye sen biara a wobɛfa so asiw ɔhyew mu nsɛm a esisi ano ne sɛ wobesiw tebea horow a ɛde ba no ano. Nkwammoaa a ɛntra digrii 45 da , a wonnya ɔhyew a ɛkɔ soro a enni sabea da, a ennya ahoɔden a ɛba fam sen digrii 0 da -saa nkwammoaa no bɛbɔ akwakoraa ne aberewa sɛnea ɛsɛ, wɔbɛyɛ wɔn ade sɛnea wɔahyɛ ho nkɔm, na ɛde ahobammɔ ho asiane ketewaa bi bɛba. Ɔhyew a wɔde di dwuma ho nhyehyɛe no ne wo ho ban a edi kan, na ɛnyɛ wo ogya a wode siw ogya ano nhyehyɛe no.
Cabinet Airflow: Nsɛm a ɛkɔ akyiri a Obiara Di Mfomso
Sɛ HVAC a ne kɛse teɛ mpo a, ɔhyew a ɛyɛ pɛ no gyina mframa a ɛsen no kyekyɛ so. Eyi ne baabi a mahu mfiridwuma mu asiane ahorow a ɛsom bo sen sɛnea metumi akan.
Ɔkwan a wɔsɔre tia kakraa bi no ho hia. Mframa a ɛyɛ nwini hyɛn kabinet no mu, na ɛpɛ sɛ ɛkɔ duct a ɛsan kɔ no mu tẽẽ. Sɛ wɔahyehyɛ battery modules sɛnea ɛbɛyɛ a ebinom wɔ flow path titiriw no mu na afoforo nso wɔ dead zones a, wunya temperature stratification ɛmfa ho kilowatts dodow a wode cooling ahyɛ mu.
Baffles boa. Plenum nhyehyɛe ahorow boa. Nea ɛboa kɛse ne sɛ wobɛma CFD ayɛ adwuma ankasa wɔ design phase-a ɛgye sika ne bere, na ɛno nti ɛnkɔ so wɔ C&I nnwuma dodow no ara so. Engineering suban no taa yɛ "ɛyɛ kabinet ketewaa bi, mframa a ɛkɔ no betumi ayɛ den dɛn?" Mmuae no ne sɛ: ɛyɛ den araa ma ɛbɛma 10℃gradients aba module ahorow a ɛbɛn ho ntam.
BESS nhyehyɛe ahorow a wɔde gu nsukorade mu no adi ɔhaw yi ho dwuma kɛse denam gyinapɛn ahorow so. Integrators akɛseɛ no ayɛ CFD no, ayɛ prototypes no, agye designs no atom, na wɔato thermal architecture no mu. Cabinet nhyehyɛe ahorow, titiriw fi adetɔnfo nketewa hɔ, mpɛn pii no mfaa saa kwan yi so. Woretɔ awo ntoatoaso a edi kan anaa nea ɛto so abien a ɛyɛ adwini a ebia wɔannye thermal validated nsen "AC no betumi atwe emu hyew akɔ fam wɔ 35℃da."
Nea Ɛho Hia Ankasa ma Adetɔ
Sɛ worekyerɛ abɔnten so kabinet BESS a, nea ɛsɛ sɛ wohwehwɛ ni:
Ɔhyew a ɛyɛ pɛ ho nkyerɛkyerɛmu. Ɛnyɛ "kabinet no wɔ mframa a wɔde yɛ adwuma" na mmom nɔma ankasa: ɔhyew a ɛsen biara delta wɔ battery module nyinaa so bere a wɔahyɛ charge/discharge wɔ maximum ambient. Sɛ adetɔnfo no ntumi mmua asɛmmisa yi a, ɛnde na wɔnyɛ thermal engineering no.
Parasitic adesoa akontabuo wɔ site-tebea pɔtee bi mu. Ɛnyɛ generic 2% akontabuo a ɛfiri adetɔn deck-nkontabuo ankasa a wɔde TMY wim tebea ho nsɛm di dwuma ma wo instɔlehyɛn beaeɛ. Sɛ parasitic load no boro 10% wɔ rated throughput afe biara a, ɛsɛ sɛ ɛno da adi wɔ wo sikasɛm nhwɛsoɔ mu.
Low-ɔhyew charging ahobammɔ. Si so dua sɛ ɔhyew a wɔatwa no ne nea ɔyɛɛ cell no nyansahyɛ hyia, na ɛnyɛ bo a ɛsom bo bi a ebetumi ama kwan ma wɔabɔ ho ka wɔ ɔhyew a ɛma lithium plating ba mu. Hwɛ eyi mu nokware wɔ BMS nhyehyeɛ no mu, ɛnyɛ spec krataa no nko ara.
Ɔhyew sohwɛ nhyehyɛe a wɔpaw-mframa ne nsu-ho nhia pii sen sɛnea wɔde saa nhyehyɛe no di dwuma yiye na wɔhwɛ so yiye. Kabinet a wɔayɛ no yie-mframa-a ɛyɛ nwini a mframa a ɛkɔ mu ho mfiridwuma a ɛfata no bɛyɛ adwuma asen nsuo-nwini nhyehyɛeɛ a ɛwɔ pɔmpɛ a ɛdi huammɔ anaa condenser a asiw. Ɔhyew ho nhyehyɛe a eye sen biara ne nea ɛma wonya adwene a ehia wɔ agyapade no nkwa nna nyinaa mu.
Nneɛma a Etwa To a Wɔahu
Ɔhyew a wɔhwɛ so no mma nsɛm ho amanneɛbɔ a ɛyɛ anigye mma. Obiara remfa nkɔsoɔ a ɛbɛba wɔ cabinet airflow baffling mu ho amanneɛ wɔ RE + nhyiamu a ɛdi hɔ no ase. Nanso ɛyɛ nsonsonoe a ɛda mfe 15 agyapade ne mfe 8 agyapade ntam, wɔ nhyehyɛe a ɛde rated capacity ma wɔ awɔw bere mu awiabere a ɛyɛ hyew ne nea throttles to 60% right bere a wuhia no kɛse no ntam.
Mfomso a ne bo yɛ den sen biara a ɛfa ɔhyew a wɔde di dwuma ho ne sɛ wobesusuw sɛ obi foforo adi ɔhaw no ho dwuma. Nea ɛto so abien a ne bo yɛ den sen biara ne sɛ wobɛfa no sɛ nea ɛyɛ adwuma wɔ Munich no bɛyɛ adwuma wɔ Dubai.
Di kan nya thermal design no yiye. Biribiara a aka no di akyi fi hɔ.