{ "item_title" : "Commercial Load Calculation Handbook 2027-2028", "item_author" : [" Darrell J. Machado "], "item_description" : "Build commercial heating and cooling load decisions that hold together from room survey to equipment selection.Commercial HVAC capacity depends on when gains occur, where air enters, and which physical boundary an equipment rating describes. This handbook gives practicing HVAC designers, mechanical engineers, and technical reviewers a structured route from building evidence and design weather to local room peaks, simultaneous system loads, coil duty, and delivered capacity. The Load-Lineage Matrix appears throughout the book to connect each source with its calculation boundary, governing hour, and selection consequence. Its concluding register turns those connections into a searchable design record for review and handoff.The chapters follow the sequence of a real commercial project. Survey and geometry establish the zones; weather, envelope, solar exposure, people, lighting, and processes create hourly sensible and latent profiles. Ventilation, infiltration, exhaust, and recovery are traced through their actual air paths. Psychrometric states then define mixed air, coil entering and leaving conditions, condensate removal, and supply delivery. The later chapters compare local terminal peaks with air-system and plant blocks, account for fan and duct effects, and test whether selected equipment works at both peak and part load. An office-retail example shows how those calculations come together without treating unrelated peaks as simultaneous. For existing buildings, the text separates measured operating problems from permanent building demand, then checks how retained ducts, plant conditions, and controls affect a replacement unit. The selection discussion compares manufacturer ratings with project conditions and highlights mild humid hours, winter recovery, and minimum stable output. Each chapter closes with a concise reconciliation of what the designer should carry into the next decision.Inside, You Will Find: A practical framework for defining rooms, thermal zones, served systems, design assumptions, and evidence quality.Hourly methods for opaque-envelope, glazing, solar, occupancy, lighting, equipment, and infiltration loads.Ventilation and outdoor-air treatment with attention to exhaust, building pressure, energy recovery, and mixed-air conditions.Psychrometric and condensate calculations that distinguish sensible capacity from moisture removal.Local room peaks, simultaneous zone profiles, air-handler block loads, and central plant diversity.Fan, duct, leakage, and bypass checks that connect gross coil output to delivered terminal performance.Step-by-step worked examples, technical figure placeholders, and an integrated multi-zone design record.Discussion of ASHRAE/ACCA 183-2024 procedures and current ventilation and energy-code context, with project adoption verified separately.Use this handbook when preparing a design basis, reviewing a load report, selecting a cooling coil or replacement unit, or tracing a field discrepancy back to its source. Keep the matrix register beside the equipment schedule so every capacity claim can be checked against the hour and boundary that produced it.", "item_img_path" : "https://covers4.booksamillion.com/covers/bam/9/79/816/601/9798166010827_b.jpg", "price_data" : { "retail_price" : "60.99", "online_price" : "60.99", "our_price" : "60.99", "club_price" : "60.99", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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