Fluid system

A fluid system for an engine which supplies a first and a second fluid to said engine, said fluid system comprising a heat exchanger, a pump, a valve and a pump bypass wherein said first and second fluids are placed in direct heat exchange relationship, said valve being configured to regulate recirculation of a portion of said first fluid through said pump bypass in dependence upon engine running conditions, and thereby controls the temperature of the first fluid in order to control the temperature of said second fluid, wherein the flow of said first fluid to the engine is reduced by said valve to reduce the amount of heat transferred from the first fluid to the second fluid in the heat exchanger wherein said first fluid flows in a closed circuit system.

A fluid system for an engine which supplies a first and a second fluid to said engine, said fluid system comprising a heat exchanger, a pump, a valve and a pump bypass wherein said first and said second fluids are placed in direct heat exchange relationship, said valve being configured to regulate recirculation of a portion of said first fluid through said pump bypass in dependence upon engine running conditions, and thereby controls the temperature of the first fluid in order to control the temperature of said second fluid, said pump being a constant displacement pump, the output of which is regulated by recirculation of a proportion of the first fluid flow upstream of the engine to reduce the flow of said first fluid to the engine and so control the amount of heat transferred from the first fluid to the second fluid in the heat exchanger wherein said first fluid flows in a closed circuit system.