DOE-2 Reference Manual Version 2.1 - DOE2.com

A. INTRODUCTIONIII. LOADS PROGRAMThe LOADS program calculates the heating and cooling loads for each spacewithin a building based on the ASHRAE algorithms described in Ref. 1. For theload calculations it is assumed that no HVAC equipment is operating and eachspace remains at an individual constant temperature. Therefore, the hourlyload calculated by the LOADS program is the energy required to maintain thespace temperature without the effects of the ventilation air.The building hourly loads are a function of the following parameters.Building latitudeBuilding longitudeBuilding altitudeBuilding location--time-zoneBuilding orientationHourly ambient dry-bulb temperatureHourly ambient wet-bulb temperatureHourly atmospheric pressureHourly wind speedHourly wind directionHourly insolationSize of external shading surfacesOpacity of external shading surfacesLocation of external shading surfaceThickness of construction layersConductivities of construction layersDensities of construction layer materialsSpecific heats of construction layer materia-IsSequence of layers in constructionThermal lag of furnishings and structureSchedules for occupantsSChedules for lightingSChedules for equipmentInfiltrationPosition of spaces within the buildingPosition of spaces with respect to other spacesSize of exterior, interior, and underground surfacesConstruction of exterior, interior, and underground surfacesPosition of exterior, interior, and underground surfaces.The user's problem is to determine these parameters and put them into aform usable by the LOADS program. To do this, each of the parameters must bedescribed by a sequence of Loads Description Language (LDL) instructions.I 11.1 (Revised 5/81)