Abstract: A dedicated outdoor air system (DOAS) includes an outdoor unit providing a temperature at a set dry bulb temperature and dew point temperature in a wide variety of outdoor air conditions. The DOAS monitors and modulates suction pressure and head pressure in order to maintain a dew point temperature of 45° F. for supplied air. Furthermore, the DOAS includes a hot gas reheat coil, allowing the system to heat the air to 73° F. before supplying the air to a space, even where outdoor air temperature is lower than 73° F. In one embodiment, the DOAS includes an energy recovery ventilator (ERV) in order to precondition the air to decrease the amount of energy needed to operate the DOAS in some conditions.

Abstract: A dedicated outdoor air system (DOAS) includes an outdoor unit providing a temperature at a set dry bulb temperature and dew point temperature in a wide variety of outdoor air conditions. The DOAS monitors and modulates suction pressure and head pressure in order to maintain a dew point temperature of 45° F. for supplied air. Furthermore, the DOAS includes a hot gas reheat coil, allowing the system to heat the air to 73° F. before supplying the air to a space, even where outdoor air temperature is lower than 73° F. In one embodiment, the DOAS includes an energy recovery ventilator (ERV) in order to precondition the air to decrease the amount of energy needed to operate the DOAS in some conditions.

Abstract: A system generates performance data, including supply air temperature and supply air dew point temperature, of an air conditioning device when provided with parameters of the air conditioning device, such as specifications of individual components of the air conditioning device. The system automatically modulates operating parameters for the simulated air conditioning device in order to achieve set point conditions and subsequently provides suggested operating parameters for the air conditioning device to enable the air conditioning device to achieve a set point temperature, a set point relative humidity, and/or a set point dew point temperature at one or more part-load conditions. In one embodiment, the system automatically calibrates the air conditioning device to operate the device to achieve user-defined setpoints.

Abstract: A dedicated outdoor air system (DOAS) includes an outdoor unit providing a temperature at a set dry bulb temperature and dew point temperature in a wide variety of outdoor air conditions. The DOAS monitors and modulates suction pressure and head pressure in order to maintain a dew point temperature of 45° F. for supplied air. Furthermore, the DOAS includes a hot gas reheat coil, allowing the system to heat the air to 73° F. before supplying the air to a space, even where outdoor air temperature is lower than 73° F. In one embodiment, the DOAS includes an energy recovery ventilator (ERV) in order to precondition the air to decrease the amount of energy needed to operate the DOAS in some conditions.

Abstract: A dedicated outdoor air system (DOAS) includes an outdoor unit capable of providing a temperature at a set dry bulb temperature and dew point temperature in a wide variety of outdoor air conditions. The DOAS monitors and modulates suction pressure and head pressure in order to maintain a dew point temperature of 45° F. for supplied air. Furthermore, the DOAS includes a hot gas reheat coil, allowing the system to heat the air to 73° F. before supplying the air to a space, even where outdoor air temperature is lower than 73° F. In one embodiment, the DOAS further includes an energy recovery ventilator (ERV) in order to precondition the air to decrease the amount of energy needed to operate the DOAS in some conditions.

Abstract: A dual pass heat exchanger for cooling and dehumidifying an airstream has adjacent passes for air flow in which air flow is in opposite directions being counter-flow and parallel-flow passes. A cooling coil contains flowing chilled liquid refrigerant extending through all of the passes, and the coiling coil has fins on outer surfaces thereof for promoting efficient thermal transfer, whereby density of the fins in the counter-flow passes is greater than density in the parallel-flow passes, whereby fin density is varied in fin style, locational density, thickness and/or depth.

Abstract: Elongated, smaller-diameter tube heat pipes have an airflow arrangement that allows for short distances between evaporating and condensing sections of the heat pipe. The heat pipe is exposed to multiple alternate hot and cold zones adjacent to each other. Each evaporator zone accepts input heat to cause evaporation of the working fluid in the wick of the immediate vicinity. The vapor produced moves to either side by local pressure differences to condense in the two adjacent condenser zones where it is absorbed by the wick as a liquid and flows in the wick back to adjacent evaporator zones at each side. Each evaporator zone creates two fluid loops whereby evaporated working fluid splits up left and right, condenses in adjacent condenser zones and flows back to the evaporator zone as a liquid within the wick. Therefore, the overall tube length can be increased indefinitely, without traditional degradation of performance.

Abstract: A curb for supporting equipment upon a roof is constructed as a rectangular box-like structure bounded by four side walls, adapted to be vertically positioned. Each side wall is constructed of an upper panel, and a lower panel outwardly displaced from the upper panel. A crown flange is associated with the top extremities of the upper panels. An outwardly directed base flange is associated with the bottom extremities of the lower panels. An outwardly directed shoulder extends in joinder between the bottom extremities of the upper panels and the top extremities of the lower panels. The shoulder is parallel to the crown flange and positioned half way between the crown and base flanges of the tallest side wall. The features of the curb are configured and dimensioned such as to permit nesting of a plurality of the curbs.