[討論區] - B. 單位內部問題 (P.2-3 P.7-8)

Ray

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

H and H

this question may be asked HWL later to clarify

wychan

[quote:04565873cd="Ray"]Now the system seems a "fresh air with filtered only" hasn't fully treated meaning.[/quote]

不過"fresh air with filtered only" 就唔駛用鋁紙同隔熱綿包裹鮮風糟啦... 咁晒料..

H and H

好彩可以裝有線   

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)….

hales

[quote:174fab4609="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..

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.

dick queenie

正如hales 所講，summer時....外邊溫度高....抽番入屋...反而仲熱左???
咁summer開冷氣真係冇咩用喎

wicyh

[quote:2bd402ff23="wychan"]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]

70分貝係室外 室內仲會低d
同埋唔駛用雙層玻璃窗 嘈音可能無預計咁嚴重

wychan

[quote:df000469ed="wicyh"][quote:df000469ed="wychan"]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]

70分貝係室外 室內仲會低d
同埋唔駛用雙層玻璃窗 嘈音可能無預計咁嚴重[/quote]

各位大哥，70分貝我都係估估下的