# 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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