In atomic force plants, the atomic reactor must be disconnected, for wellbeing reasons, from the turbines that change over the warmth to mechanical or electrical vitality. A warmth exchange medium is obliged that can retain and exchange expansive amounts of warmth at a temperature of a few hundred degrees Celsius, so it can be utilized to bubble water in a steam turbine. Steam (water vapor) itself is a brilliant warmth exchange medium (see Example underneath), however it responds with metal parts at high temperatures to create hydrogen. The warmth exchange qualities for the instance of turbulent constrained and blended convection stream of water through restricted vertical rectangular warmed channel mimicking a cooling channel of a normal material testing reactor (MTR) have been examined and numerically explored. Numerical arrangements are performed on demineralized water as coolant going under barometrical weight through restricted rectangular channel of 80 cm length, 7 cm width, and 2.7 mm hole thickness under distinctive warmth fluxes that covers all conceivable warmth fluxes in the single-stage fluid.