The H102H heat exchanger is mounted on a metal plate and secured on the H102 panel fascia by brass threaded plastic screws.
In normal operation, hot water from the heating tank and pump passes through the ‘HOT OUT’ braided hose and self-sealing coupling into the inner tube. It then flows through the heat exchanger and leaves. Cold water flows from the ‘COLD OUT’ hose through the annulus between the larger outer tube and the smaller inner tube. With the hot water in the inner tube, losses from the system to the outside are minimised while still allowing students to see the construction of the unit. As the cold stream warms above the ambient temperature however there will be some external losses.
The hot hose terminates with a socket and the cold hose a plug to prevent cross-connection. Flow direction may be arranged for co-current (parallel) or counter-current (opposite direction) of the Hot/Cold streams. Self-sealing couplings retain the water in both the hoses and the heat exchangers. Changeover may be performed without stopping the pump or cold flow, but operators should wear gloves for protection from hot surfaces. Reversing the cold flow direction is the only recommended option.
