A district public water supply pipe network system compatible for ground source heat pump water and reclaimed water comprises a water supply main pipe connected with a reclaimed water outlet side of a sewage treatment system and connected to a plurality of energy stations and a plurality of transmission and distribution station, and a return water main pipe arranged between the adjacent energy stations to connect them. The energy stations are provided with a plurality of shallow geothermal heat exchange system for exchanging heat with shallow geothermal energy in the region. Both the energy stations and the transmission and distribution station are connected with corresponding distribution pipe networks connected with a user terminal water supply system. The system provides the source side water and the reclaimed water to users. It is a district public geothermal pipe network and a reclaimed water pipe network.

A combination air and ground source heating and/or cooling system. The system includes an indoor unit, an outdoor unit and an in-ground unit, each of which has a coil, an inlet line and an outlet line. The system also comprises a flow connector, a coupling and a controller. The controller is configured to control the flow connector and coupling so that the system is selectively operable in three different modes. In the first mode, refrigerant bypasses the coil of the outdoor unit, while, in the second mode, refrigerant bypasses the coil of the in-ground unit. In the third mode, refrigerant flows through the coils of the in-ground and outdoor units.

Apparatus and method for heating/cooling buildings and other facilities. An elongate pipe filled with water or other fluid medium forms a thermal gradient header having temperature zones that are progressively warmer towards one end and cooler towards the other. Multiple heating/cooling systems are connected to the header so as to draw fluid from zones that are closest in temperature to the optimal intake temperature of each system, and to discharge fluid back to the header at zones that are closest to the temperature to the optimal output temperature of each system, allowing each heating/cooling system to take advantage of the thermal output of other systems. The pipe forming the thermal gradient header may be routed back and forth in the facility to define a series of legs containing the different temperature zones. A boiler or other source may supply makeup heat to the thermal gradient header, and excess heat may be sent from the header to a ground field or other thermal reservoir for later use.

A method of cooling air includes a liquid coolant subsystem including a cool water source configured to hold water, an air cooling subsystem including an air chamber that contains air therein, an air conditioning apparatus including a heat exchanger of a liquid-to-air type having a heat sink in thermal communication, a fan assembly configured to move air along the heat sink of the heat exchanger, a thermostat, a temperature sensor, and a control circuit in electronic communication with the temperature sensor and the thermostat, a plumbing subsystem including an inlet piping component in fluid communication with heat exchanger, an outlet piping component in fluid communication with the exchanger, and a solenoid valve. The control circuit may be configured to activate the fan assembly and to open the solenoid valve, allowing for the transfer heat to water from the air moved by the fan assembly.

A system designed to introduce fresh air ventilation into the living space, eliminate contaminants, and add fresh air to augment a building's HVAC system. This is done in order to save energy, and the costs associated with heat loss or gain in a building. The system employs the use of geothermal energy conferred to air via a cavity which is constructed in the basement, on the slab, foundation, in the crawl space and/or attic of a building. This cavity is created to circulate, absorb and store/release the geo-solar characteristics of a building, taking advantage the consistent subterranean temperature of the earth and/or sun, in order to warm air from outside during the winter minimizing the foundation heat sink, and cool air during the summer. One or more heat exchangers are used to transfer the energy from contaminated air in the cavity to clean air destined for the HVAC system.

A geothermal heating and cooling system that uses a water source to provide a heat transfer medium is provided. Elements of the system may include a water source, one or more circulation loops coupled to the water source, a heat exchanger and/or heat pump, and/or a monitoring component configured to monitor for conditions within the system, including leak integrity and water quality.

A coaxial ventilator (20) exchanges atmosphere between parts of a building (22) that are at differing heights. The coaxial ventilator (20) includes an outer conduit (24) that extends from an upper end (42) thereof downward to a lower end (44) thereof. The outer conduit (24) surrounds an inner conduit (62) that extends substantially the entire length of the outer conduit (24). Both the outer and inner conduits (24, 62) are open at their respective upper ends (42, 66) and lower ends (44, 68). Temperatures of atmosphere both surrounding and within the outer conduit (24) and the inner conduit (62) induce an exchange of atmosphere between the coaxial ventilator (20) and surrounding atmosphere.

The geothermal heat utilization system is capable of supplying underground water of an upper aquifer from the first upper opening to the second upper opening via the first pipe, and capable of supplying underground water of a lower aquifer from the second lower opening to the first lower opening via the second pipe. Further, the geothermal heat utilization system is configured to pump hot water and at the same time, pump cold water.

A thermal tubing support device that includes: a horizontal bar, where the horizontal bar includes a first end and second end; side support frame, extending from each end of the horizontal bar; and a base, where the base is attached to the distal end each side support frame. Each side support frame preferably includes two rollers, where the two rollers of each side support removably attaches to each end of the horizontal bar. Further, preferably, the two rollers of each side support attach to the base at opposing corners. The base preferably includes four sides, where two sides of the base include rollers. The thermal tubing support device may further include a support loop attached to the horizontal bar, where the support loop provides a means to support the support device in an elevated position.

The present application discloses a control method for an HVAC system in a relatively large spatial place and the HVAC system. The HVAC system comprises an air handling unit, and the air handling unit is provided with a valve through which a fluid medium passes and a fan; and the method comprises: monitoring a return air temperature of air circulated back to the air handling unit; providing a return air temperature setpoint of the HVAC system; and performing decoupling adjustment on one of the fan and the valve, and then adjusting the other of the fan and the valve so that the return air temperature is close to the return air temperature setpoint. According to the present application, the HVAC system can operate in a steady and energy-saving way.