Abstract:
A water heating system having a system inlet pipe (1.002), a hot water delivery pipe (1.003) and a hot water return pipe (1.006) connected to a building hot water distribution network (1.024); the water heating system including one or more water heaters (1.001), the or each water heater having a heater inlet (1.022) and a heater outlet (1.023), a hot water return pipe (1.006) connected between the system inlet and delivery outlet via the building hot water distribution network to form a close loop hot water supply-return circuit; a pump (1.005) connected to circulate water through the hot water supply-return circuit whereby the pump can circulate water through one or more of the water heaters; a valve means (1.007) [a first non-return valve] adapted to prevent inlet water (water delivered to the system inlet) from flowing into the hot water return pipe or the building hot water distribution network.
Abstract:
A closed-loop system includes a pump driving a fluid through a series of conduits. A control system is included that minimizes pressure fluctuations in a bootstrap reservoir to maintain a desired minimum pressure at the pump inlet. Moreover, the control system reduces a maximum system pressure by reducing the magnitude of pressure fluctuations encountered by the bootstrap reservoir.
Abstract:
Disclosed is a control system for controlling a plurality of fluidly and operably connected water heaters to meet a hot water demand such that overall efficiency is maximized and usage disparity between water heaters is minimized. There is further disclosed a method for detecting a small system demand in said network by adjusting the setting of each flow limiting valve of each water heater. There is still further disclosed a method for enabling seamless addition or removal of a heater in service and heating load distribution to water heaters.
Abstract:
A flow-control valve has a housing having first and second input ports and respective first and second output ports for respective first and second separate fluid streams and formed between the first and second port with first and second valve seats. Respective first and second valve bodies are axially shiftable in the valve seats, and a coupling element connected axially between the valve bodies moves the valve bodies axially jointly. A diaphragm between the first piston and the housing defines an axially inner compartment into which the first input port opens and between the diaphragm and the housing an axially outer compartment. The first valve body is formed with a passage extending through the first valve body and having an axially extending part opening into the outer compartment and a transversely extending part opening into the housing between the first seat and the first output port.