Hybrid Water Cooling

Keeping options open for cooling, circulating oil is working out to be much more difficult than I expected. The high viscosity of oil is making circulation quite difficult. I am thinking of cooling the oil immersed computer with water. How do I intend on doing this quite simple. The schematic explains the Basic system. The coolant is stored in a reservoir (1) . A simple aquarium pump (2) is used for circulating the coolant. A heat collector (4) is immersed in the oil (3) in which the CPU is immersed. The coolant is circulated through this collector from where the coolant absorbs the heat. The heated coolant is then passed through a radiator (5) which will radiate the heat to the atmosphere. The coolant then returns back into the reservoir