Ngā tuhinga mō ngā Mīhini Whakamatao
He mīhini wera te pouaka whakamātao e mahi whakamuri ana. Nō reira, ka tangohia e te mīhini wera te wera mai i te rohe pāmahana iti ka panaia ki te rohe pāmahana teitei. Kia puta ai tēnei tukanga, me mahi te mīhini i te mahi. Heoi, ka rere noa te wera mai i te rohe pāmahana teitei ki te rohe pāmahana iti. Kāore e taea e te wera te rere ko ia anake mai i te rohe pāmahana iti ki te rohe pāmahana teitei. E rite ana tēnei ki te kōrero a Clausius i kōrerohia i mua. Mō te tukanga e puta ana i roto i te pouaka whakamātao, ka taea te tuhi i te kōrero a Clausius o mua penei:
Kāore e taea e te mīhini whakamatao (e mahi ana i roto i te huringa) te neke i te wera mai i te wāhi pāmahana iti ki te wāhi pāmahana teitei, me te kore e mahi i te mahi ( Te Ture Tuarua o te thermodynamics - te kōrero a Clausius).
Ko te tuhinga kua whakatītahatia he kōrero motuhake mō te ture tuarua o te thermodynamics. E pā ana tēnei kōrero ki ngā mīhini whakamatao anake. Ko te tukanga o te whakarerekē i te āhua o te pūngao me te whakawhiti i te epūngao kei runga 
He rite te āhua o te mīhini whakamatao ki te hoahoa i raro nei.
Ka mahi te mīhini (W) ki te tango wera mai i tētahi wāhi pāmahana iti (QL ) ka tukuna te wera ki tētahi wāhi pāmahana teitei (QH ) . I runga i te tiakitanga o te pūngao, ka taea te whakatau ko QL + W = QH.
Mena ka whakamahia te kupu "whai hua" i roto i ngā miihini wera, ka whakamahia te kupu "tauwehenga mahi" (KK) i roto i ngā mīhini whakamatao. Ko te tauwehenga mahi (KK) o tētahi mīhini whakamatao ko te ōwehenga i waenga i te wera i whakawhitia mai i tētahi wāhi pāmahana iti (Q L ) ki te mahi (W) i mahia hei whakawhiti i te wera. Mā te pāngarau, ka taea te tuhi penei:
Ki te hiahia koe ki te whakaatu i te ōrau o te tauwehenga mahi o tētahi mīhini whakamatao, whakareatia tēnei whārite ki te 100%. Ko te tauwehenga mahi o tētahi mīhini whakamatao tino pai (tauwehenga mahi Carnot o tētahi mīhini whakamatao):
He maha ngā mīhini whakamatao e whakamahia whānuitia ana e tātou, tae atu ki ngā pouaka whakamātao, ngā hauhautanga (AC) me ngā papu wera.
Pouaka Whakamātao
Ko te pūwhakamātao = te huri i te mamaoa hei wai, ko te pūwhakamātao = te kōpeke. Kei roto i te pouaka whakamātao ngā koiri whakamatao, ko ngā koiri pūwhakamātao ia kei waho o te pouaka whakamātao (kei muri o te pouaka whakamātao).
Kei roto i ngā koiri he wai kei te taurite āhua (kei roto i ngā āhua wai me te kohu). E mōhiotia ana tēnei wai ko te hau whakamatao. Ko te hau whakamatao i whakamahia i mua ko te freon. Kāore e whakamahia ana te freon i ēnei rā nā te mea ka taea e tana tukunga te kino i te paparanga ozone.
Ka kukume te mōtini kōpeke (e peia ana e te hiko) i te hauhautanga (i roto i te āhua kohu) ka kōpeke i te āhua adiabatic. Nā te kōpeketanga adiabatic, ka piki ake te pāmahana o te kohu. I te pikinga o te pāmahana, ka piki ake hoki te pēhanga o te kohu. Nā te rerekētanga pāmahana i waenga i te kōpeke (te pāmahana teitei) me te whakapūmau (te pāmahana iti) ka rere te kohu pāmahana teitei, pēhanga teitei mā roto i ngā koiri whakapūmau kei muri o te pouaka whakamātao.
He teitei ake te pāmahana o te mamaoa i te pāmahana o te hau e karapoti ana, nō reira, ina rere mā roto i te koiri whakapūmau, ka tukuna e te mamaoa te wera ki te hau e karapoti ana. Nā te mea kua whakapūmautia e te whakapūmau, ka whakamatao te mamaoa, ka huri hei wai. Ina rere mā roto i te takirere whānui, ka whānui haere te hau whakamatao kua huri hei wai. Nā te noho mai o te whānui haere ka makariri ake te wai (ka heke tōna pāmahana). Ka rere te wai matao ki roto i ngā koiri i roto i te pouaka whakamātao. Nā te mea he makariri ake te wai i roto i ngā koiri i te hau i roto i te pouaka whakamātao, ka mimitihia te wera e te wai kia huri rā anō te hau whakamatao hei kohu (ka mimitihia e te wai te wera i roto i te pouaka whakamātao). Ka momihia te hau whakamatao kua huri hei kohu e te motuka kōpeke, ā, ka pēhia haere. Ā, pērā tonu… (ka tuaruatia anō te tukanga). Nā te mea ka neke te wera i roto i te pouaka whakamātao ki te wai i roto i ngā koiri, ka makariri te pouaka whakamātao.
AC (haumātao)
Ahakoa he rerekē te hoahoa o te taputapu, he rite tonu te kaupapa mahi matua o te hauhautanga ki tērā o te pouaka whakamātao. I tēnei wā, he rūma te pouaka whakamātao . Ko te tikanga, kei roto i te rūma ngā koiri whakamatao, ko waho ngā koiri whakamatao. Kei muri i ngā koiri whakamatao he pā. Ko te mahi a te pā he whakahaere noa i te rere o te hau me te pupuhi i ngā koiri whakamatao, kia tere ake ai te whakawhiti wera i waenga i ngā koiri whakamatao me te hau e karapoti ana. I tetahi atu taha, kei muri i ngā koiri whakamatao he pupuhi, arā, he pupuhi. He rite tana mahi ki te pā. I a te pā e pupuhi ana i ngā koiri whakamatao ki waho, e tuku ana i te wera ki te hau e karapoti ana, ka pupuhi te pupuhi i ngā koiri whakamatao ki roto, ka horahia te hau matao puta noa i te rūma.
Papu Wera
Ko ngā papu wera e whakamahia ana i ngā takurua makariri. He rite te kaupapa mahi a te papu wera ki te pouaka whakamātao. Ko te rerekētanga he taputapu te pouaka whakamātao hei whakamatao i te rūma, ko te papu wera ia hei whakamahana i te rūma. Ahakoa e mahi ana te pouaka whakamātao ki te mimiti i te wera mai i te rūma (QL ) me te tuku ki waho (QH ) , ka mimiti te papu wera i te wera mai i waho (QL ) ka tuku ki roto i te rūma (QH ) . Mā te wera tāpiri ka mahana ake te rūma. Ina tae mai te raumati, ka taea te huri i te papu wera kia mahi hei hauhautanga (AC).
