An Air Handling Unit
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An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-co nditioning system. An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-co nditioning system. The basic function of the AHU is take in outsid e air, re-condition it and su pply it as fresh air to a building. All ehaust air is removed, !hich creates an acceptable indoor air "uality. #epending on the re"uired temperature of the re-conditioned air, the fresh air is either heated by a recovery unit or heating coil, or cooled by a cooling coil. $n buildings, !here the hygienic re"uirements for air "uality are l o!er, some of the air from the rooms can be re-circulated via a miing chamber and this can result in signi%cant energy savings. A miing chamber has dampers f or controlling the ratio bet!ee n the return, outside and ehaust air . The AHU is a large metal bo containing separate ventilators for supply and ehaust, heating coil, cooling coil, heating&cooling recovery system, air %lter racks or chambers, sound attenuators, miing chamber, and dampers. AHUs connect to duct!ork that distributes the conditioned air through the building, and returns it to the AHU. A heat&cooling recovery echanger is normally %tted to the AHU for energy savings and increasing capacity. An AHU designed for outdoor use, typically on roofs, is also kno!n as a rooftop unit ('TU). T ransmisi udara (airborne transmission) adalah penularan agen infeksi melalui sebaran aerosol, dan biasanya dihirup orang melalui saluran pernapasan. ALIDATION OF AIR HANDLING UNITS(HVAC SYSTEM) : VALIDA TION OF AIR HANDLING UNITS(HVAC SYSTEM) Under the guidane !" Mu#hra"" A$i %han #ir& 're#ented * HUSNA %AN+AL ,URESHI& INTRODUCTION: : INTRODUCTION- Heating .enti$ati!n and air !nditi!ning (HVAC) ##te/# are u#ed in the 0har/aeutia$ 0$ant t! 0re.ent !nta/inati!n and u#ed t! 0r!.ide !/"!rta$e 1!r2ing !nditi!n#& A/ient air /a ha.e di""erent !nta/inant#* the /!#t !//!n eing the du#t& Du#t an e r!ugh$ $a##i"ied #i 3e- C!ar#e du#t (0arti$e #i3e 45 t! 4556) Fine du#t (0arti$e #i3e 7&5 t! 456) U$tra "ine du#t(0arti$e #i3e 5&4 t! 7&56) C!ar#e du#t #ett$e# ra0id$& Fine du#t #ett$e# #$!1$& U$tra "ine du#t re/ain# !n#tant$ #u#0ended& N!r/a$$ ateria #ett$e# the/#e$.e# !n du#t 0arti$e#& En.ir!n/ent i# !ne !" the #!ure# 1hih an au#e ateria$ !nta/inati!n& F!r 0r!0er 1!r2ing* a !/"!rta$e te/0erature i# re8uired& F!r thi# rea#!n air /a e re8uired t! e heated !r !!$ed& There"!re* air hand$ing ##te/# are !"ten a$$ed HVAC SYSTEMS& CLEAN ROOM : CLEAN ROOM Air 1i$$ e re8uired t! e "i$tered t! ring d!1n 0artiu$ate /atter& Thi# $ead t! the e/ergene !" $ean r!!/ !ne0t& A $e an r!!/ i# an area !r 3!ne 1here the 0artiu$ate and ateria$ !nta/inati!n i# $i/ited t! #0ei"ied $e.e$& Air !rne 0artiu$ate /atter and degree !" "i$trati!n i# a ritia$ 0ara/eter 1ith re"erene t! the $e.e$ !" 0r!dut 0r!teti!n re8uired& There are three $e.e$# !" 0r!teti!n& LEVEL 7- Genera$9 an area 1ith r!utine h!u#e 2ee0ing and /aintenane& LEVEL :- 'r!teted9 an area 1here #te0# ha.e een ta2en t! 0r!tet the e;0!#ed drug #u#tane# "r!/ !nta/inati!n and degradati!n& LEVEL <- C!ntr!$$ed9 an area in 1hih #0ei"i en.ir!n/enta$ !nditi!n# are de"ined* !ntr!$$ed = /!nit!red t! 0re.ent !nta/inati!n !r degradati!n !" drug& F!r eah inrea#e in $ean r!!/ $a##i"iati!n* air hange rate# #h!u$d e inrea#ed 0r!0!rti!nate$&
Transcript of An Air Handling Unit
8/18/2019
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