how to calculate heat transfer rate through a heat pipe ?

Objective: maintain a temperature of water feed into an equipment to be ( 0C-20C). he surrounding temp is about -15 C in Winter and 40 C in summer. I would consider the soil as a heat sync. Any equation to calculate the amount of heat the heat pipe can transfer or  be dissipated  ? Thanks !!

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sultan86 (author) 4 years ago
Thanks for this brief. I am not intending to design a heat pipe. Yet I want to know what is the heat pipe that fit my requirement in terms of heat transfer. Specially, I would like to obtain an idea about standard heat pipes available and their heat transfer ability; so I know which one is suitable in my case.
You need to put a handle on the amount of heat you need to handle.
sultan86 (author)  steveastrouk4 years ago
Thanks, Would you give me examples of heat pipe and corresponding amount of materials it can handle ?
No. The process starts with your estimation of LOAD.
sultan86 (author)  steveastrouk4 years ago
I need to transfer 30 Watt and move up to 62 Watt of heat .What are available heat pipes ?
The other problem is that your process end is swining around the heat sink - +40 in summer, -15 in winter. Its pumping both ways.

Take a close look at this paper.
The answers your looking for can be found here.

Consider your needs and then design/find a heat pipe that can meet those needs. Not all heat pipes are created the same. Some use copper and some use other metals as the main body of the pipe. Then you need to consider the inside of the pipe. Is it grooved or lined with a wicking material. If it has a wicking material what is it. Also what liquid is being used and what temperatures does that liquid need to reach to become a gas to carry the heat to the cool end of the pipe. Then you need to consider weather the cool end of the pipe is cool enough to allow the gas to condense and travel through the wick back to the heat source. Once you know all of that you will be able to look up more information. Like how fast the copper pipe with XX thick walls can transfer heat. Then how fast the liquid is able to go from gas back to liquid. Then how effective the wick is at moving that liquid to the other end again. BUt you also gotta consider the cool end. How fast will that cool end be able to remove the heat from the pipe. 

Chances are you will be limited by the temp of your cool end and how effective it is at getting rid of the heat.