Need help with an application I am thinking of. In this application just 10 cubic inches per second of cold air is needed, that too for 2-5 seconds only. Also, not a lot of cooling/heating capacity is needed, just 30C of air cooling should be sufficient. How would we construct such a device? I am thinking of attaching a hand pump (like this one http://bit.ly/1LpLIkD ) to a vortex tube of 0.3 CFM The user would simply use hand to squeeze the pump a few times air through vortex tube and create cold/hot air I calculated that our hands can squeeze a ball of size 5 cubic inches quite comfortably. So if we squeeze twice per second, it is 10 cubic inches per second. This seems quite doable. Questions I have are: 1. Can a vortex tube of capacity 600 cubic inches per minute be constructed? 2. Would such a device be capable of cooling if we pass 10 cubic inches air/second for 2-5 seconds? 3. Some search shows that human hand can create 30 PSI pressure. So problem is reduced to Is it possible to create a vortex tube of capacity 0.3CFM that can cool air by 30C at 30 PSI within 2-5 seconds? I have been trying to figure this out but now I realize ... I need help! HELP please!