Lesson 1Fundamentals of heat transfer for HVAC loads: sensible vs latent, conduction, convection, radiation, and solar gainsThis part reviews heat move basics for HVAC loads, telling felt and hidden heat apart, and describing conduction, convection, radiation, and sun gains as they apply to building covers and inside sources in simple terms.
Felt versus hidden heat meaningsHeat move through building partsAir move at inside and outside surfacesLong and short wave radiation effectsSun gains and their mix with loadsLesson 2Solar heat gain calculations: orientation, shading factors, glass properties, and use of solar heat gain coefficientsThis part covers how sun gains enter through glass, how direction and shade change incoming light, and how glass traits and SHGC values are used to guess hourly sun cooling loads for better designs.
Sun shape and surface directionShade tools and shade numbersGlass kinds, covers, and light passUsing SHGC and area to find sun gainsTime and season sun changesLesson 3Presenting load calculation worksheets: unit conversions, consistent units (IP), and step-by-step example structureThis part describes how to set up and show load sheets, keep steady IP units, do key unit changes, and build step-by-step examples so ideas and middle results can be followed easily by anyone.
Usual sheet setup and partsSteady IP units and common mistakesKey unit changes for load workRecording ideas and inputsStep-by-step example showingLesson 4Equipment and plug load calculations: inventorying, duty cycles, diversity factors, and internal heat distributionThis part explains how to guess tool and plug loads from connected power, work cycles, and diversity, and how inside heat is split between felt and hidden parts and spread among areas for accurate sums.
Finding tool and plug listsConnected load, need, and work cycleDiversity numbers for plug loadsFelt versus hidden tool gainsArea spread of inside tool heatLesson 5Ventilation and latent loads: outdoor air sensible and latent contributions, using humidity ratios and psychrometric principlesThis part looks at outdoor air flow loads, using wet ratios and air trait rules to split felt and hidden parts, and shows how rule-needed air flow turns into cooling and dry air loads simply.
Air flow from rules and standardsOutdoor and indoor design conditionsWet ratio, total heat, and air chartsFelt versus hidden air flow loadsPre-cooling and energy save effectsLesson 6Infiltration and unbalanced ventilation: estimating infiltration rates, impact on latent and sensible loadsThis part explains how uncontrolled air leaks and uneven air flow affect felt and hidden loads, ways to guess leak rates, and how stack, wind, and machine effects show in load sums for safe designs.
Causes of leaks: wind and stackAir changes, CFM, and cover leak measuresGuessing leaks for load designFelt and hidden load from leaksUneven air flow and pressure effectsLesson 7Latent load estimation and psychrometrics: dew point, specific humidity, calculation of latent heat loads from people, ventilation, and processesThis part builds hidden load guessing using air traits, covering dew point, exact wet, and how to sum hidden heat from people, air flow, and wet-making processes in buildings for clear understanding.
Dew point, wet ratio, and wet percentAir chart move basicsHidden gains from peopleHidden loads from air flowProcess wet sources and dry air makingLesson 8Load calculation approaches: manual cooling load calculations, heat balance overview, and simplified methodsThis part introduces main cooling and heating load sum ways, including detailed hand methods, heat balance ideas, and simple rules, pointing out accuracy, inputs, and usual uses for good choices.
Design goals and needed accuracyHand part-by-part methodsHeat balance and heat-time series ideasSimple and rule waysComparing methods and picking oneLesson 9People load calculations: sensible and latent contributions per occupant and per area, using ASHRAE tablesThis part details how to measure felt and hidden heat from people using ASHRAE tables, thinking about activity, clothes, and people schedules, and how to change people loads to area-based design values.
Body heat rates and activity groupsASHRAE tables for felt and hidden gainsPeople density and diversity numbersSchedules and peak people choiceChanging per-person to per-area loadsLesson 10Combining loads and safety factors: coincident load summation, diversity, temperature delta selections, and peak load extrapolation from one floor to whole buildingThis part shows how to mix part loads into system design loads, use diversity and safety numbers, pick indoor and outdoor design temp gaps, and guess floor results to whole-building peaks for full plans.
Same-time versus not load summingUsing diversity on inside gainsPicking indoor and outdoor design gapsSafety numbers and avoiding too big sizesScaling floor loads to whole buildingsLesson 11Envelope heat gains: conduction through walls, roof, windows using UA method and solar heat gain through glazingThis part covers cover heat gains through walls, roofs, and windows using UA way, including temp gaps, sun-hit surfaces, and how conduction and sun gains mix in glass parts for accurate calcs.
U-values, R-values, and UA sumsWall and roof conduction with design gapsWindow conduction and frame effectsSun gains through glass systemsHeat mass and time delay thoughtsLesson 12Lighting load calculations: converting lighting power density to sensible heat, diversity, and control impactsThis part explains how to change lighting power density and light data into felt heat gains, use diversity and control plans, and count schedules, day light dim, and light loss for real sums.
Lighting power density and light dataChanging watts to felt heat gainsLighting schedules and diversity numbersControls: people and day light dimLight loss, driver, and light losses
