In EnergyPlus the zone humidity ratios and temperatures are decoupled from the solution of the air system equations. Typically a humidity ratio and a mass flow rate will be variables involved in the iterative solution. In other words it is not possible to solve the equations directly instead iterative methods are needed. When the zone air and the air system are modeled with algebraic equations (steady state) then - in cases with recirculated air - there will be one or more algebraic loops. EnergyPlus uses algebraic energy and mass balance equations combined with steady state component models. Simulating a forced air system and its associated zones can be done in a number of ways. Supply and return plenums are also included on the zone equipment side of the loop. The zone equipment side of the loop contains the air terminal units as well as fan coils, baseboards, window air conditioners, and so forth. The primary air system includes supply and return fans, central heating and cooling coils, outside air economizer, and any other central conditioning equipment and controls. The input objects related to these air loops begin “AirLoopHVAC.”įor simulation purposes the air loop is divided into 2 parts: the primary air system (representing the supply side of the loop) and the zone equipment (representing the demand side of the loop). The air loop is just the “air side” of a full HVAC system. The term “loop” is used because in most cases some air is recirculated so that the air system forms a fluid loop. In EnergyPlus an air loop is a central forced air HVAC system.
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