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**1. I have attached an attempt on paint to give you a very rough idea of the very simple heat exchanger. The pipes are cooled by the air and it is a good few metres above the ground. For simplicities sakes lets say, for example, both vertical drops by the pipes are 5m in length and that it is 8m across at both sides of the heat exchanger. The heat exchanger in the middle is just a bunch of simple hairpins as the pipe travels downwards (there is no shell of any kind).**

**2. I've been given the flow rate and the diameter.**

I've obtained area, velocity, Re number, density and viscosity quite simply.

I can choose any material for the pipe but I have to calculate the friction coefficient myself.

I've also got to perform calculations on pressure losses and temperature changes after the heat transfer.

Where the l on my crappy paint image is equal to the valve I've also got to calculate the flow conditions before the water enters the heat exchanger if the valves are both fully and half opened.

I know the pipes length and the reservoir diameters as well as how full up they are before the valve is opened. We're not assuming any losses due to pipe corners, just losses due to friction.

I've obtained area, velocity, Re number, density and viscosity quite simply.

I can choose any material for the pipe but I have to calculate the friction coefficient myself.

I've also got to perform calculations on pressure losses and temperature changes after the heat transfer.

Where the l on my crappy paint image is equal to the valve I've also got to calculate the flow conditions before the water enters the heat exchanger if the valves are both fully and half opened.

I know the pipes length and the reservoir diameters as well as how full up they are before the valve is opened. We're not assuming any losses due to pipe corners, just losses due to friction.

**3. I really don't know where to go to continue. I'm sure there's something so obvious that I'm missing but I really don't know what. I feel like I haven't been given enough information.**

I'm not looking for anyone to give me the answers, I just want somebody to give me an idea of the steps to take now to move towards the answers.

Can anybody help?

Please let me know if you don't understand my explanation. I'll be on here first thing tomorrow morning to clarify things further.

Thanks in advance for any help you can offer me.

Lucy

I'm not looking for anyone to give me the answers, I just want somebody to give me an idea of the steps to take now to move towards the answers.

Can anybody help?

Please let me know if you don't understand my explanation. I'll be on here first thing tomorrow morning to clarify things further.

Thanks in advance for any help you can offer me.

Lucy