Physics and Control of an HVAC PID Simulator
An intuitive engineering explanation of the thermal physics, chilled-water behavior, PID control, and energy metering used in an interactive Fan Coil Unit and Air Handling Unit simulator.
Independent journal · research and practice
Ricardo Rosal Journal
Research, technology, essays, and creative observations on science, literature, music, and the systems that shape everyday life.
The journal
Recent writing
Entropy, Information and Uncertainty
A concise introduction to Shannon entropy and the mathematical measurement of uncertainty in discrete systems.
Building a Local-First MDX Journal
A practical architecture for a statically generated editorial website whose content remains readable, portable, and version controlled.
The Margin and the Memory of Reading
An essay on annotation, rereading, and the quiet record created when a reader leaves traces beside a text.
Listening for Structure
A reflection on repetition, expectation, and the gradual shift from hearing musical events to perceiving their relationships.
Selected work
Featured projects
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completed · Next.js · TypeScript · D3.js
Scientific Data Visualization Platform
A local-first platform for exploring scientific datasets through reproducible, accessible, and publication-ready visualizations.
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Journal sections
ScienceNotes and essays on mathematics, natural science, information, and inquiry.Technology ProjectsEngineering decisions, software systems, experiments, and technical practice.Personal EssaysReflective writing on work, attention, place, memory, and ordinary life.MusicListening notes, musical form, performance, and the culture around sound.PaintingObservations on visual art, technique, color, and ways of seeing.LiteratureEssays on books, language, criticism, and the craft of reading.HobbiesPractical notes from long-running interests, experiments, and collections.
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