Nonpowered Instant Water Heater

摘要

The technical feasibility of a nonpowered instantaneous water heater based on theuse of a condensing steam ejector pump has been established by test of a commercially available ejector. Using steam at approximately 25 PSIG pressure, it has been demonstrated that water can be simultaneously heated and pumped to pressures up to two times the steam pressure. The overall system concept is that of a lightweight, portable heater package that is fired with a constant-run, manually-controlled burner. The concept can accommodate the operation of a constant-run burner with only intermittent water delivery, as in a kitchen use, by recirculation of heated water back to the supply tank/barrel. With outlet water pressure greater than the inlet steam pressure, the unit can incorporate automatic feed of makeup water to the steam generator. The system concept can be implemented in a range of outputs. At 100,000 Btu/hr burner output and 50% efficiency, system capability would be at about 0.8 GPM continuously with a 100 deg F temperature rise, 1.5 GPM continuously with about a 50 deg rise, or 1.5 GPM intermittently at 100 deg F rise and 50%/50% on-off delivery duty cycle.