| 摘要 |
<p>A gas water heating system is described that utilises most of the heat of combustion of the fuel in an area remote from the tank itself. It also provides a cold lower tank area that stays cooler than the bulk of the volume of the tank through the heating cycle. It also provides a cold lower tank area above the flue outlet of the remote heat exchanger further enhancing the efficiency. It also delivers hotter water to the top of the tank, thereby filling the tank with hot water from the top down. It also utilises the superior insulating properties of plastic foam. It also efficiently uses the pilot flame heat without it causing a high airflow through the unit, with attendant thermal losses. The tank unit is easily replaced in the event of a tank leak or rupture, but retaining the gas equipment and heat exchanger for further use. The central flue has been deleted, and the products of combustion are now directed up the outside of the tank surface in a gap provided between the tank outer wall and a metal sheet wrap to keep the hot gases against the tank wall. Two or more separate fluid paths that are in good mutual contact for efficient heat transfer. The fluid paths are generally tubular and the length of the tubing on one side of the heat exchanger carrying a first fluid may be shorter or longer than that for the second fluid. 2, 1,19 F G2~4-3</p> |
