An exemplary vent for a heat recovery ventilator is provided. The vent includes an exhaust opening and an intake opening positioned below the exhaust opening. The exhaust opening and the intake opening are configured to be coupled to an air exhaust duct and an air intake duct, respectively, of the heat recovery ventilator. A hood is positioned around the exhaust opening, the hood including a top plate, a first side plate coupled to the top plate, a second side plate coupled to the top plate, and a bottom plate coupled to the first and second side plates. Each of the top plate and the bottom plate is configured to slope downward from the exhaust opening.

A heat and energy recovery ventilation unit for a building, having an inside and an outside. The unit including a main body having a fresh air inlet and an indoor air outlet on one side and a fresh air outlet and an indoor air inlet on the other side and having an air to air heat exchanger within the main body and connected to each of said inlets and outlets to define respective air flow passageways for each of said indoor air and said fresh air, the heat exchanger permitting heat and energy exchange between said indoor air and said fresh air. Also included is a first variable speed blower and a second variable speed blower and at least one electronic air flow sensor to measure at least one of the air flows the air flow sensor producing at least one electronic signal related to the sensed air flow. Also included is a controller for receiving the data signal, the controller using the data signal to control at least one of the variable speed blowers to provide a balanced fresh air inflow and indoor air outflow through the ventilation unit. A method of operating the unit is also disclosed.

There is provided a heat exchanger system comprising a housing defining a heat exchange compartment in which are extending a plurality of circular flexible pipes including radially extending fins, the fins defining a helical pattern along the length of each of the circular flexible pipes. There is also provided a circular flexible pipe having radially extending fins, the fins defining a helical pattern along the length of the circular flexible pipe. There is further provided a method and an apparatus for manufacturing a circular flexible pipe having radially extending fins, the fins defining a helical pattern along the length of the circular flexible pipe.

A hybrid air conditioning apparatus includes a first air conditioning device and a second air conditioning device. The first air conditioning device is a cooling and heating air conditioner, and the second air conditioning device communicates with the first air conditioning device. Air modulated by the second air conditioning device is sent to the first air conditioning device for cooling and heating air adjustment. Accordingly, the air discharged from the first air conditioning device has enhanced quality and all kinds of properties in the air are provided uniformly.

An energy recovery ventilator cabinet containing a plurality of enthalpy wheels. The enthalpy wheels are substantially perpendicular to a stream of forced air, allowing the air to pass through the wheels. The enthalpy wheels are also disposed such that portions overlap, allowing multiple enthalpy wheels to be disposed in a smaller space than if the enthalpy wheels were placed side by side. This arrangement has led to energy recovery effectiveness similar to that obtained by a larger, single enthalpy wheel, but has the advantage of using less space.

An air conditioner controlling method includes: deciding on a supply-air temperature Ts and a return-air temperature Tr as specified design values; deciding that the total heat-exchange efficiency η is zero; selecting two or more stepped levels of the outdoor-air volume percentage α; deriving a linear function which expresses a relation between an outdoor-air temperature To and a mixed-air temperature Tm for each level of the outdoor-air volume percentage α by using the return-air temperature Tr and the total heat-exchange efficiency η; and deciding on the range where the mixed-air temperature Tm is lower than the supply-air temperature Ts for each of the linear functions and the range where the mixed-air temperature Tm in each linear function comes closest to the supply-air temperature Ts as compared with the mixed-air temperatures Tm in the other linear functions.

A condensate, precipitation and recycled water recovery system is described, for use in cooling applications such as air-cooled air conditioning and refrigeration systems. The recovered and recycled water system is a method designed to assist the air-cooled condenser in cooling the refrigerant, prior to the refrigerant cooling control system evaporator. The system can include an electronic control system, although not essential in all embodiments. In one embodiment, at least one condensate, precipitation, and recycled water recovery system is attached to the condenser of the refrigerant cooling control system. In another embodiment, multiple condensate, precipitation, and recycled water recovery systems are located on the condenser of the refrigerant cooling control system.

A condensate, precipitation and recycled water recovery system is described, for use in cooling applications such as air-cooled air conditioning and refrigeration systems. The recovered and recycled water system is a method designed to assist the air-cooled condenser in cooling the refrigerant, prior to the refrigerant cooling control system evaporator. The system can include an electronic control system, although not essential in all embodiments. In one embodiment, at least one condensate, precipitation, and recycled water recovery system is attached to the condenser of the refrigerant cooling control system. In another embodiment, multiple condensate, precipitation, and recycled water recovery systems are located on the condenser of the refrigerant cooling control system.

A water-to-air system using a modulating/proportionate control valve to regulate the amount of sensible reheat when operating in a dehumidification mode is disclosed. When in the reheat/dehumidification mode of operation, the modulating valve regulates the volume of water through a condenser coil to regulate refrigerant temperature to provide for sufficient reheating of the equipment supply air temperature within a narrow range, regardless of the inlet water temperature. The air conditioning system may be any type of water-cooled system, including a water source heat pump or water-cooled air conditioner.

An air handling unit, particularly for data center cooling, operates to cool a flow of return air from a conditioned space using a flow of ambient air. The return air is recirculated to the conditioned space as supply air. The flow of ambient air can be adiabatically cooled to a lower temperature to provide additional cooling. A flow of makeup air can be joined with the cooled return air to form the supply air, and can be sourced from the ambient environment directly or from the heated flow of ambient air.