Chilled Water System Design Handbook: From Load to Commissioning
A practical digital reference for chilled-water design. Plant illustration is conceptual.
Designing a chilled-water system means connecting cooling loads, water flow, pipe sizing, pump duty and controls into a coordinated engineering solution. Nexora’s Chilled Water System Design Handbook brings that journey together in a 261-page PDF, with 30 chapters and Appendices A–J.
A chiller schedule is only the beginning. The real design questions appear at the interfaces: how the flow was derived, which circuit governs pump head, how valves behave at part load, and how the installed system will be tested.
This practical reference is written for HVAC and MEP engineers, consultants, contractors and facility teams who want a structured route from fundamentals to design deliverables.
Build your chilled-water design reference
Explore the handbook’s coverage and decide whether it fits your next project or learning goal.
What is inside the handbook?
The guide follows ten parts, progressing from system fundamentals to a complete teaching project and commissioning. Clickable contents and PDF bookmarks help you return to individual chapters while working.
Chapters 1–7: refrigeration fundamentals, chiller types, system configurations, cooling loads, water flow and supply/return temperatures.
Chapters 8–11: chiller selection, plant staging, air-cooled and water-cooled plant design.
Chapters 12–18: piping layouts, sizing, insulation, accessories, pump-head calculations and variable-speed pump selection.
Chapters 19–23: cooling coils, control valves, hydronic balancing, expansion, pressurization and water management.
Chapters 24–27: cooling towers, condenser-water systems, BMS sequences and plant optimization.
Chapters 28–30: a complete chilled-water design example, drawings and schedules, testing, adjusting, balancing and commissioning.
Move from calculations to a design process
A useful reference should help you decide what to do next. The handbook’s structure lets you study the whole system first, then revisit the chapters needed for a particular calculation or review.
Design sequence: establish the basis, develop the circuit, coordinate the equipment, then document and verify. Revisit earlier selections when project information changes.
A practical way to use the guide
Start with Chapters 1–7 to record the load basis, system arrangement and water-temperature assumptions.
Use Chapters 8–18 while preparing plant selections, piping calculations and pump duties.
Read Chapters 19–27 when coordinating terminal units, valves, pressurization, heat rejection and controls.
Work through Chapter 28 to see the calculations brought together in one teaching project.
Use Chapters 29–30 and the appendices to organize schedules, review checks and commissioning requirements.
ASHRAE’s hydronic guidance treats temperatures, flow, piping, pumps and terminal control as interconnected design decisions. That is why checking each selection against the rest of the system matters.
A quick example: cooling load to water flow
Chilled-water supply is water leaving the cooling plant for the loads. Return water comes back after absorbing heat. ΔT is the return-to-supply temperature difference.
Simplified educational example: assume a 500 kW water-side cooling duty and a 5 K temperature rise. Use water density ρ ≈ 1,000 kg/m³ and specific heat cₚ ≈ 4.18 kJ/(kg·K).
Q = ρ × V̇ × cₚ × ΔT
Q = heat-transfer rate (kW); V̇ = volume flow (m³/s); ρ = density (kg/m³); cₚ = specific heat (kJ/(kg·K)); ΔT = water temperature rise (K).
V̇ = 500 ÷ (1,000 × 4.18 × 5)
V̇ ≈ 0.0239 m³/s = 23.9 L/s = 86.1 m³/h
This establishes a flow requirement, not a complete equipment selection. Check actual fluid properties, coil performance and equipment flow limits; glycol mixtures require different properties.
Turn the method into a repeatable workflow
Continue from water flow to piping, pump head, valves and control sequences using the handbook’s linked chapters and complete design example.
Keep useful checks close to your work
Appendices A–J bring together supporting material for design and review. The checklists, worksheets and templates are included as pages within the PDF.
Design and chiller-selection checklists.
Pump-head calculation template and pipe-sizing worksheet.
Typical equipment and valve schedules.
Design parameters, engineering equations, symbols and abbreviations.
Recommended engineering references.
Use them to organize assumptions and calculation records before a technical review. Documenting the basis of a selection makes it easier to revisit when a layout, duty or equipment pressure drop changes.
Who will find it useful?
Junior HVAC engineers building a systematic understanding of chilled-water design.
Design engineers looking for a connected reference across plant, distribution and terminal systems.
Contractors and estimators reviewing design scope, schedules and coordination requirements.
Facility engineers connecting design intent with balancing, controls and operating checks.
Basic familiarity with HVAC terminology will help. Readers can follow the early chapters in order, while experienced practitioners can use the bookmarks to reach a specific topic.
Common mistakes worth checking
Sizing the pump from building height alone: a filled closed loop normally balances rising and falling water columns; circulation duty depends on circuit losses. Static pressure still affects pressurization and component ratings.
Selecting components from unrelated assumptions: reconcile loads, temperatures, flow and equipment data.
Treating the PDF’s example values as mandatory project criteria: worked assumptions are teaching inputs.
Leaving schedules and commissioning requirements until handover: Chapters 29–30 place these deliverables within the design process.
Professional checks still matter
Use the handbook as an engineering learning and working reference. Final designs require project-specific calculations, current manufacturer selections, local regulations, adopted codes and specifications.
The examples do not establish universal pipe velocities, temperature differences, pressure allowances or guaranteed energy savings. Record your assumptions, confirm the applicable requirements and obtain the appropriate professional review.
Frequently asked questions
Is this a digital handbook?
Yes. The handbook is a 261-page PDF with 30 chapters, schematic references and Appendices A–J. It includes clickable contents and bookmarks.
Does it cover more than chiller selection?
Yes. The contents include piping, pumps, coils, valves, balancing, pressurization, water treatment, cooling towers, controls and commissioning.
Does it include a worked project?
Chapter 28 presents a complete chilled-water design example. Treat it as a teaching project and adapt the method to your own design basis.
Where can I check the current offer?
The product buttons in this article open the Gumroad listing, where you can review the current price, purchase terms and download details before buying.
Make your next design easier to follow
A clear design method helps you connect individual calculations to the decisions behind them. Nexora’s handbook provides a structured reference you can study from beginning to end and return to throughout a project.
Explore the complete engineering handbook
Bring 30 chapters, a complete teaching example and practical reference appendices into your chilled-water design library.
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