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               PSYCHROMETRIC CHART :-  Psychrometry deals with the determination of the thermodynamic properties of moist air and the utilization of these properties in the analysis of conditions and processes involving moist air. The basic coordinate grid lines of the chart are enthalpy, which slopes up to the left, and the humidity ratio (or specific humidity) which runs horizontal. Dry-Bulb temperature is illustrated by vertical lines uniformly spaced. Wet-Bulb lines slope similarly to enthalpy lines, but the slope increases as the temperature increases. Note that wet-bulb line is not parallel to an enthalpy line; this is because of the heat added to the air mixture by the moisture, as it changes from dry to saturated air. Relative humidity lines are curved, with the saturation line defining the upper boundary of the chart. know more...

AIR-HANDLING UNIT OVERVIEW

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An air handling unit often abbreviated as AHU, is a factory fabricated assembly consisting of fan, heating and/or cooling coils, filters, dampers and other necessary equipment to perform one or more of the following functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying, and mixing of air.  Air handling systems range in complexity from stand-alone units that serve individual rooms to large, centrally controlled systems serving multiple areas in a building. HVAC engineers refer to the areas served by an air handling system as zones. The smaller the zone, the greater the likelihood that good control will be achieved; however, equipment and maintenance costs are directly related to the number of zones. Some systems are designed to provide individual control of rooms in a multiple-zone system. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served, without ductwork. They can be used in many other applications, ...
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  Impact on the Rest of the HVAC Design  & engineering Where heat recovery will be used for heating, the chiller should tie into the boiler return. A tertiary loop is recommended so the chiller heat recovery temperature range can be different from the boiler loop range. The flow rates for the boiler and the heat recovery will most likely be different as well. A tertiary loop also allows the pressure drop through the heat recovery chiller to be avoided when heat recovery is not possible. Most heating systems are designed for 170°F average water temperature. The use of heat recovery will require the heating system to operate with water in the 105 to 115°F range. Whereas single row heating coils in terminal heating units would have worked with a conventional design, now 3- or 4- row heating coils may be required. These coils will add to the capital cost of the project. Further, they will increase the fan static pressure drop every hour the fan system operates. Domestic ...