Abstract:
A pump assembly (10) for pumping boiling water to a dispenser in a drinking water dispensing system, the pump assembly (10) comprising: a pump housing (20) having an inlet (22) for the boiling water and an outlet (24) arranged in fluid communication with the inlet (22); an impeller (30) disposed in the pump housing (20) for rotation about a central axis (23) for driving the water from the inlet (22) to the outlet (24), wherein the inlet (22) is arranged on the central axis (23); and an inducer (40) arranged in the inlet (22) to the pump housing (20) and operatively connected to the impeller (40) for rotation therewith about the central axis (23) to induce the water at the inlet (22) towards the impeller (30) and raise the inlet pressure.
Abstract:
A tap handle assembly (100) comprising: a tap body (110) having an inlet (112) and an outlet (114); a tap handle (120) mounted to the tap body (110) and being moveable between a closed position and an open position; a valve mechanism (130) in the tap body (110) and operably associated with the tap handle (120), the valve mechanism (130) being adapted for movement between a closed position, corresponding to the closed position of the tap handle (120), preventing fluid flow between the inlet (112) and the outlet (114) of the tap body, and an open position, corresponding to the open position of the tap handle (120), permitting fluid flow between the inlet (112) and the outlet (114) of the tap body (110); and a latch (160) mounted on the tap handle (120) and coupled to the valve mechanism (130), the latch (160) being moveable between a locked position, engaging the valve mechanism (130) to retain the tap handle (120) in the closed position, and an unlocked position, disengaged from the valve mechanism (130) to allow movement of the tap handle (120) between the closed position and the open position, the latch (160) being biased towards the locked position and always free to move towards the unlocked position, wherein operation of the tap handle assembly (100) to cause fluid to flow from the inlet (112) to the outlet (114) of the tap body (110) is a two-step process in which the first movement of the latch (160) from the locked to the unlocked position then allows the second movement of the tap handle (120) from the closed position to the open position.
Abstract:
A method of operating a water chiller (10) having a water tank (12), a cold water tap, and a condenser and fan (18). The chiller avoids freezing of the water in the tank (l2) by switching between `normal' and `protection' operating modes. The switching is initially triggered by checking the length of time since the cold water tap was last operated.
Abstract:
A method of determining an operating water temperature for a boiling water heater (10). The method including the following steps: (a) adding water to a tank (12) to a predetermined level; (b) heating the water in the tank (12) to approximately 95 degrees Celsius; (c) applying sufficient heat to the water in the tank (12) so as to cause boiling of the water in the tank within a predetermined first period of time; (d) measuring the boiling water temperature of the water in the tank (12); and (e) subtracting a predetermined temperature from the boiling water temperature measured in step (d) to arrive at the operating water temperature.
Abstract:
A method of automatically sanitising and/or disinfecting water in a chilled water dispenser (100), the method including the steps of: at predetermined time intervals, de-energising a refrigeration means (120) in the chilled water dispenser (100); energising a heating means (130) associated with the chilled water dispenser (100) to heat water within a water storage tank (110) to a first predetermined temperature sufficient to kill bacteria and/or pathogens in the water, thereby sanitising and/or disinfecting the water; maintaining the temperature of the water at or above the first predetermined temperature for a predetermined period of time; at the end of the predetermined period of time above, de-energising the heating means (130); and re- energising the refrigeration means (120) to chill the water to a second predetermined temperature sufficient to be deemed suitable for human consumption as chilled drinking water.
Abstract:
A method of determining an operating water temperature for a boiling water heater (10), the method including the following steps (a) adding water to a tank (12) to a predetermined level; (b) energising a heating means (14) within the tank (12) to heat the water in the tank (12) to an initial predetermined temperature; (c) de-energising the heating means (14) when the initial predetermined temperature is reached and measuring an initial overshoot temperature differential above the initial predetermined temperature; (d) calculating a further predetermined temperature being the sum of the initial predetermined temperature and a predetermined amount of the initial overshoot temperature differential; (e) waiting until the temperature of the water in the tank (12) has reduced by a predetermined drop from the initial predetermined temperature; (f) energising the heating means (14) within the tank (12) to heat the water in the tank (12) to the further predetermined temperature as calculated in (d) above; (g) de-energising the heating means (14) when the further predetermined temperature is reached and measuring a further overshoot temperature differential above the further predetermined temperature; (h) re-calculating the further predetermined temperature being the sum of the current further predetermined temperature and a predetermined amount of the current further overshoot temperature differential; (i) waiting until the temperature of the water in the tank (12) has reduced by a predetermined drop from the further predetermined temperature of step (h); (j) continuing steps (f) to (i) until the further overshoot temperature substantially equals the predetermined temperature, thereby becoming a boiling calibration temperature; and (k) substracting an offset temperature from the boiling calibration temperature of step (h) to thereby determine the operating water temperature.
Abstract:
A boiling water heater system (10) for providing hot water at a dispensing outlet (45). The heater system (10) includes a first water heater (15), a second water heater (21). The first water heater (15) is arranged in fluid communication with a water supply (18) for heating water from the water supply (18) from an ambient temperature (Tl) to a first elevated temperature (T2). The second water heater (21) is arranged in fluid communication with the first water heater (15) for heating the water from the first elevated temperature (T2) to a dispensing temperature (T3), that is higher than the first elevated temperature (Tl). The second water heater (21) includes a storage tank (20) arranged in fluid communication with a dispensing outlet (45).