Water cooling issue
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This post was last edited by omexfds on 2015-11-9 09:43. Hello, everyone: I would like to ask what the maximum temperature of the cooling medium can reach when water is used as the coolant? The situation is as follows; please take a look and see if it’s feasible Cooling is achieved using coiled tubes, within which there is a mixture of water at 10 L/h and air at 1.8 Nm³/h at a pressure of 8 MPa and a temperature of 300°C; the temperature is reduced to 30°C℃ ； Is water cooling possible when the outside of the coil is at atmospheric pressure? Water flow rate is approximately 0.3 m³/h (the inlet water is at room temperature, with a temperature rise of about 10°C) ； The questions are: 1. Can it be cooled by water, and what is the maximum temperature of the medium used for water cooling? 2. Will high-volume water cause vaporization outside the high-temperature coil, and will this affect the safety of the equipment? Looking forward eagerly, thank you.
I don’t think it’s very possible. With high flow rates, it’s theoretically feasible, but factors such as the heat exchange rate and contact area are fixed, so I personally believe it’s very difficult to achieve. I’m a beginner and don’t have any data related to equipment, so my opinion isn’t very reliable
It can be calculated, but the heat exchange efficiency using coiled tubes is a bit low. It is best to use enhanced heat transfer tubes for shell-and-tube exchangers; air-based heat transfer types are too poor.
It can be calculated, but the heat exchange efficiency using coiled tubes is a bit low. It is best to use enhanced heat transfer tubes for shell-and-tube exchangers; air-based heat transfer types are too poor.
With such a low flow rate, it’s impossible to use a coiled tube design; I’m worried about vaporization on the outside of the high-temperature coil.
Hello, the original poster; you didn’t specify what device it is. At 300°C, ordinary steel can be used normally. I’m not sure what the medium in your equipment is or what its specifications are. It’s hard to give a clear answer. We have previously manufactured valves for steel mills, where the temperature of the medium reaches up to 1300 degrees. Below such equipment are hot blast stoves; the device walls that are in direct contact with the medium are all equipped with water-cooling systems, and high-pressure circulating water poses no problems at all.
Calculate what the heat exchange area is, and then decide whether to use coiled tubes or shell and tube tubes – the main issue is that the water flow rate is too low.
From a thermal balance perspective, it is possible to keep the water temperature from rising by more than 2°C. However, the amount you mentioned is really too small; it’s also difficult to construct a coil for this purpose. It seems to be more of an experimental device
Cooling from 300°C to 30°C? Are you kidding me? If water cooling is used, the latent heat of vaporization also needs to be taken into account. . . . .
The air heat transfer coefficient is extremely low; how much heat transfer area is required to cool from 300°C to 30°C?
1. Can it be cooled by water? What is the maximum temperature of the medium used for water cooling? Generally, it does not exceed 150°C. No