To protect against freezing, a 50%: 50% mixture of water–glycol is used in a radiator instead of…

To protect against freezing, a 50%: 50% mixture of
water–glycol is used in a radiator instead of pure water. Assume that the
velocity of both liquids (water and water–glycol mixture) is the same in the
radiator. Determine the following at a given vehicle speed.

(a) Increase or decrease in the heat transfer coefficient
for the water–glycol mixture compared to that for pure water. Consider fully
developed turbulent flow in the water tubes and use the following
Dittus–Boelter correlation for the Nusselt number: Nu = 0:023Re0:8.Pr0:4.
The physical properties of water and the water–glycol
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To protect against freezing, a 50%: 50% mixture of
water–glycol is used in a radiator instead of pure water. Assume that the
velocity of both liquids (water and water–glycol mixture) is the same in the
radiator. Determine the following at a given vehicle speed.

(a) Increase or decrease in the heat transfer coefficient
for the water–glycol mixture compared to that for pure water. Consider fully
developed turbulent flow in the water tubes and use the following
Dittus–Boelter correlation for the Nusselt number: Nu = 0:023Re0:8.Pr0:4.
The physical properties of water and the water–glycol mixture at 938C are as
follows:

(b) Increase or decrease in UA for the water–glycol mixture
compared to that for pure water. Assume that (hA)water/( ohA)air
= 10, and fouling and wall thermal resistances are negligible. Hint: Use Eq.
(3.24) and obtain the ratio of two UA’s.

(c) Increase or decrease in the heat rejection rate of the
radiator due to the use of the water–glycol mixture. Idealize NTU ¼ 0:5 with
water, C* 0, Cmin / Cair,
and identical inlet temperature differences Tmax’s.

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