Lesson 1Inverter (variable-speed) vs fixed-speed compressors: efficiency, part-load performance, inrush current, ambient considerationsCompare inverter and fixed-speed compressors for office use, looking at efficiency levels, part-load comfort, starting current, electrical sizing, and how they work in hot and cool weather in the picked city.
How inverter drives adjust capacityFixed-speed behaviour at part loadInrush current and electrical sizingEfficiency ratings at full and part loadAmbient temperature effects on capacityLesson 2Choosing system type: single-split vs multi-split, benefits and tradeoffsLook into picking between single-split and multi-split systems for a 2,000 sq ft office, balancing zoning ease, setup cost, upkeep trouble, backup options, and room for growth in a real business setup.
Zoning needs and temperature control goalsPiping layout and installation constraintsCost comparison: equipment and labourService access and maintenance complexityRedundancy and impact of unit failureLesson 3Estimating internal gains from computers and office equipment (W per workstation) and occupancy schedulesFigure out internal heat from computers, screens, printers, and people in a 2,000 sq ft office by guessing watts per workstation, usage factors, and work hours, then turn these into sensible and hidden loads.
Typical W per workstation and equipmentDiversity factors for office equipment useOccupancy density and schedule profilesSeparating sensible and latent componentsConverting internal gains to BTU/h loadsLesson 4Preparing a short justification statement referencing a chosen city climate (sensible/latent balance) and recommended unit specification sheet items (capacity, SEER/IEER, sound, dimensions)Practice writing a short reason for the chosen system using a specific city weather, mentioning sensible and latent balance, and main spec sheet details like capacity, SEER or IEER, noise levels, and unit sizes.
Choosing a representative city climateSummarising sensible and latent loadsReferencing capacity and efficiency ratingsIncluding sound, size, and clearance dataStructuring a clear justification paragraphLesson 5Calculating sensible and latent heat loads: people, equipment, lighting, envelopeBuild skills to calculate sensible and latent loads from people, equipment, lights, and building shell, then add them up into a total design load that matches real working conditions for the 2,000 sq ft office.
People loads: sensible and latent splitsEquipment and lighting heat gain methodsEnvelope loads: walls, roof, and glassUsing CLF or similar factors for timingCombining components into design loadLesson 6Selecting capacity in BTU/h and tons: rounding, safety factors, diversity and part-load considerationsLearn to pick system capacity in BTU/h and tons for the office, covering rounding rules, safety margins, zone differences, and part-load work so equipment runs well without constant short stops.
Converting calculated load to nominal tonsRounding up or down from load resultsApplying reasonable safety factorsAccounting for diversity across office zonesChecking part-load operation and cyclingLesson 7Refrigerant options and implications for performance and serviceability (R410A, R32, others)Go over common coolants like R410A and R32, comparing efficiency, pressure, glide, fire risk, and environment effect, and see how coolant pick affects piping setup, tools, and future rules.
Key properties of R410A and R32Efficiency and capacity differences by refrigerantSafety, flammability, and code requirementsImpact on piping, charge, and componentsService tools, training, and phaseout risksLesson 8Using simplified load sizing rules (BTU/ft²) and comparison with manual J style estimatesLearn to use simple BTU per square foot rules for quick office load guesses, then compare and adjust them against Manual J methods to know limits, fixes, and when full calculations are needed.
Typical BTU/ft² ranges for office spacesAdjusting rules for climate and building qualityComparing quick rules to Manual J style resultsRecognising when rules of thumb failApplying safety factors without oversizingLesson 9Selecting auxiliary features: filtration level, noise ratings (dB), controls and connectivity optionsLearn to pick filter levels, noise ratings, and control choices that fit office comfort, air quality, and IT needs, including MERV filter picks, dB goals, smart controls, and building network links.
Choosing MERV rating and filter typeNoise criteria and target indoor dB levelsFan speed settings and sound tradeoffsThermostat types and scheduling optionsConnectivity, BACnet, and app integrationLesson 10Matching indoor unit airflow and coil selection to room sensible load and thermostat placementUnderstand matching indoor unit air flow and coil size to room sensible loads, thinking about thermostat spot, air reach, diffuser pick, and avoiding winds or uneven air that cause office comfort issues.
Calculating required CFM from sensible loadSelecting coils for sensible heat ratioAir throw, diffuser type, and coverageThermostat location and sensor placementAvoiding drafts, short cycling, and stratification
