活動名稱
【解題達人! We want you!】
活動說明
阿摩站上可謂臥虎藏龍，阿摩發出200萬顆鑽石號召達人們來解題!
針對一些題目可能有疑問但卻缺少討論，阿摩主動幫大家尋找最佳解!
懸賞試題多達20萬題，快看看是否有自己拿手的科目試題，一旦你的回應被選為最佳解，一題即可獲得10顆鑽石。
懸賞時間結束後，只要摩友觀看你的詳解，每次也會得到10顆鑽石喔!
關於鑽石
如何使用:
- ✔懸賞試題詳解
- ✔購買私人筆記
- ✔購買懸賞詳解
- ✔兌換VIP
(1000顆鑽石可換30天VIP) - ✔兌換現金
(50000顆鑽石可換NT$4,000)
如何獲得:
- ✔解答懸賞題目並被選為最佳解
- ✔撰寫私人筆記販售
- ✔撰寫詳解販售(必須超過10讚)
- ✔直接購買 (至站內商城選購)
** 所有鑽石收入，都會有10%的手續費用
近期考題
【非選題】
【題組】(c)(Continued on (b)) Fouling is a severe issue to this heat exchanger, resulting in a decline of overall heat transfer coefficient. Through an operation under the minimum flow rate of soybean oil, the predicted overall heat transfer coefficients are linearly decreased to 900 W/m2*K and 800 W/m2*K in the first and the second months, respectively. What is the minimum heat transfer area required to achieve the target temperature of the soybean oil at the exit of the heat exchanger during the 2-month operation (i.e., 80 ℃)?
Problem 6
A silicone oil having a temperature of 185 ℃, heat capacity of 5.0 kJ/(kg K) and a flow
rate of 150 kg/min is used for pre-heating the soybean oil (i.e, for biodiesel production)
by using the following heat exchanger (sce the plot shown below).
Based on the design, the temperatures of the silicone oil leaving the shell is preferred
(but not necessary) to be ≦170 ℃. The temperature of the soybean oil entering the
pipes is 20 0C, and the target temperature of the soybean oil at the exit of the tubes/pipes
is ≧80 ℃. Here, the heat capacity of soybean oil is assumed to be 80% of the heat
capacity of silicone oil regardless of the variation in their temperatures. The flow rate
of soybean oil is targeted to be at least 3600 kg/hour.
A silicone oil having a temperature of 185 ℃, heat capacity of 5.0 kJ/(kg K) and a flow
rate of 150 kg/min is used for pre-heating the soybean oil (i.e, for biodiesel production)
by using the following heat exchanger (sce the plot shown below).
Based on the design, the temperatures of the silicone oil leaving the shell is preferred
(but not necessary) to be ≦170 ℃. The temperature of the soybean oil entering the
pipes is 20 0C, and the target temperature of the soybean oil at the exit of the tubes/pipes
is ≧80 ℃. Here, the heat capacity of soybean oil is assumed to be 80% of the heat
capacity of silicone oil regardless of the variation in their temperatures. The flow rate
of soybean oil is targeted to be at least 3600 kg/hour.
【題組】(c)(Continued on (b)) Fouling is a severe issue to this heat exchanger, resulting in a decline of overall heat transfer coefficient. Through an operation under the minimum flow rate of soybean oil, the predicted overall heat transfer coefficients are linearly decreased to 900 W/m2*K and 800 W/m2*K in the first and the second months, respectively. What is the minimum heat transfer area required to achieve the target temperature of the soybean oil at the exit of the heat exchanger during the 2-month operation (i.e., 80 ℃)?
【非選題】
四、近年來本屬醫療用之電動代步車已大量駛上道路，成為頗受老人及行動不便者喜好 之另一種交通工具。然而由於電動代步車之行駛速度緩慢、相關之交通安全設施又 明顯不足（如照明、反光設計），行駛於交通繁忙之道路上確實險象環生。如果您是 交通主管部門之首長，請問您將以何種方法及對策來面對此新出現之道路交通安全 問題。（25 分）
四、近年來本屬醫療用之電動代步車已大量駛上道路，成為頗受老人及行動不便者喜好 之另一種交通工具。然而由於電動代步車之行駛速度緩慢、相關之交通安全設施又 明顯不足（如照明、反光設計），行駛於交通繁忙之道路上確實險象環生。如果您是 交通主管部門之首長，請問您將以何種方法及對策來面對此新出現之道路交通安全 問題。（25 分）
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