[討論區] - B. 單位內部問題 (P.2-3 P.7-8)

Ray

is okay.

Normally is 5-8 l/s per person.

Ray

[quote:32dda35491="H&H"][quote:32dda35491="wychan"][quote:32dda35491="H&H"]Q3呢 佢地根據環保署規劃署及地政署既要求去建造言下之意 如果低估左d噪音問題都唔關佢事啦 我地只可以話政府失職 噪都只可噪政府而唔可以話佢係誤導取巧之類 :?:[/quote]

冇錯，不過我相信政府會以full load時的標準如70分貝做基準，換言之在t9還未完全運作時效果會更好..[/quote]full load 先有70分貝有冇機會係預多左呢[/quote]

If window is sound proof type  then no problem.

Ray

[quote:4848f78241="Ray"]is okay.

Normally is 5-8 l/s per person.[/quote]

However lower 2 deg.C from outdoor which may not possible to dehumid to 60% during Jan and Feb (high humid season).  :em05:  :em05:

Ray

[quote:a6c5bd6f1a="wychan"][quote:a6c5bd6f1a="Ray"][quote:a6c5bd6f1a="Ray"]is okay.

Normally is 5-8 l/s per person.[/quote]

However lower 2 deg.C from outdoor which may not possible to dehumid to 60% during Jan and Feb (high humid season).  :em05:  :em05:[/quote]

你最初話入口處可以cool到16度，但現在只得兩度好似冇用，分分鐘仲嘖熱風

在夏天，一般室內比室外低三-四度，但是鮮風溫度只比室外溫度低兩度，那麼d風咪有熱風的感覺??[/quote]

In normal PAU is set at 16 deg during Summer. This issue is putting the view of energy saving. However I guess 2 deg.c is insuccessful..

Now we don't know the design capacity so the max.load / capacity of PAU is also unknow.

Ray

Now the system seems a "fresh air with filtered only" hasn't fully treated meaning.

Ray

[quote:a76d43091d="hales"]以約數計算 100 sq ft 大約等於 10 sq meter
以一個600呎實用面續既單位計算
大約有 60 sq meter 樓底 9呎2吋計即係有275 cm 高
單位空氣體績約數為:
60 m2 x 275cm
= 60m x 1m x 275cm
= (6000 x 100 x 275) cm3
(1000 cm3 = 1 Litre)
then = [(6000 x 100 x 275) / 1000] Litre
= (6 x 100 x 275) Litre
= 165000 Litre

如果每秒 20Litre intake of flesh air
= (20 x 60 x 60) Litre/hour intake
= 72000 Litre/Hour intake

suppose唔會密封哂所有窗口 抽風道等等i.e. 室內為一個open system
then 165000 / 72000 = 2.29
即係話 室內每小時換氣 2.29次
以世衛既recommendation 隔離病房要求為每小時換氣10次.....
所以並不合乎隔離既要求....但我地又唔係被隔離 所以如每小時換氣2.29次
已經足夠唔開窗都唔會好焗 如果要計溫度既話......err.........................=.=
我Thermodynamic既書....掉哂好耐了.....有冇人可知道室內氣溫下降兩度係點計..>"<[/quote]

有冇人可知道室內氣溫下降兩度係點 => mc dt = mc x (t2-t1) = mc x 2

"以世衛既recommendation 隔離病房要求為每小時換氣10次"
which is different story in a office / guest room/bed room fresh air for each person is 5-8 l/s.

Air exchange means inject air from outdoor to indoor directly fresh air means treated outdoor air i.e. filtered dehumid and cooled /heated.

Air exhange rate is applied for toilet kitchen and special areas saying"隔離病"

Toilet = 8 air change per hr.
kitchen = 12 (I am not sure)
carpark =12

I think Air exchange Rate to be 72000:165000 = 1:0.44 i.e. less than 1
But the volume to be 165000 x 0.8 (net rate) = 132000
i.e. 0.54 times per hr

However if you put ON the fans the result of air exchange rate will be totally different…. Fresh air (not from PAU) will come from outdoor (window gap)….

Ray

[quote:2d17d7dae1="hales"][quote:2d17d7dae1="Ray"]
I think Air exchange Rate to be 72000:165000 = 1:0.44 i.e. less than 1
But the volume to be 165000 x 0.8 (net rate) = 132000
i.e. 0.54 times per hr
[/quote]

How come 72000:165000 = 1:0.44 :?:  :?:
72000 : 165000
= 72000 / 72000 : 165000 / 72000
= 1 : 2.29............. :?:
or you means 0.44 : 1 ?

不過你岩~我睇錯~
只係 0.54次....因為一次intake既volumw少於室內既total volume..[/quote]


just share idea.

Ray

[quote:9a34480064="louis"][quote:9a34480064="lamlam"]佢地話d 鮮風係單向送入屋 d廢氣就靠廚房及廚所的抽氣扇排出 如果鮮風系統唔可以熄 咁返工甚至去旅行咁駛唔駛都要開住個抽氣扇 :?:[/quote]

I guess we can turn off fresh air system per flat right?

[/quote]

In think the system has not separated control for fresh air.

NO need to switch ON exhaust fan as fresh air will pressure out through door / window gap.

Ray

[quote:ad86bba886="wychan"][quote:ad86bba886="wicyh"]
In case中央鮮風系統不設開闢 即不在住戶控制範圍之內 我地可唔可以要求發
展商提供永久免費保養維修[/quote]

我諗都幾難啦 :em16:  :em16:[/quote]

Yes the system will pass to RC i.e. own by RC maintenance by RC electricity charge bill to RC.

ALL for RC :em01:  :em01:  :em01: