Changelog

Vapor Cycle

• Secondary-side heat exchanger inputs: Condenser and evaporator cases now support secondary-side fluid, flow direction, volume flow, and inlet or outlet temperature inputs.
• LMTD and UA estimates: Component details show LMTD and required UA when the secondary-side setup is enabled and physically valid.
• Clearer UA comparison: Component details separate segmented LMTD, overall endpoint LMTD, overall endpoint AMTD, and segmented AMTD results so common estimation methods are easier to compare.
• Grouped result layout: Secondary-side rows now use clearer grouped headings and shorter labels, while the left input panel focuses on zone-level LMTD UA values.
• Water and glycol support: Secondary-side fluid options include water and a 50% ethylene glycol water solution.
• Saved per case: Secondary-side settings, enabled state, expanded state, and flow units are saved independently for each case and restored after refresh.
• Flow unit choice: Volume flow can be entered in L/min or L/h, with values converted automatically when the unit changes.

Vapor Cycle

• Multiple operating cases: Create cases from the current setup, switch between them, rename them, and delete cases you no longer need.
• Automatic browser save: Cases are saved locally in the browser, so refreshed pages restore your saved inputs and active case.
• Synchronized results: Inputs, units, charts, summary values, engineering tables, and component details now follow the active case together.
• Cleaner case controls: The case strip uses a compact segmented style with stable hover and selection behavior.

Vapor Cycle

• Clearer condenser breakdown: Condenser details now show superheat, condensing, and subcooling zone shares so the heat rejection distribution is easier to scan.
• Clearer evaporator breakdown: Evaporator details now show two-phase and superheat zone shares to highlight where the heat absorption is concentrated.
• Consistent detail tables: The new percentages use the same parameter, value, and unit table format as the existing component detail rows.

Table Configuration

• Choose the columns you need: Saturation lookup tables now use a Columns menu so you can show only the properties you want to compare.
• Selection order is respected: When a hidden column is shown again, it is appended to the current table, making it easier to build a table around your comparison workflow.
• Clear fixed starting columns: Sweep tables still start with saturation temperature, while single-temperature multi-fluid tables still start with the fluid name.

Usability and Readability

• Cleaner column menu: Columns are grouped into Basic, Liquid, Vapor, and Phase Change sections, and the full row can be clicked to toggle a column.
• More stable table widths: Column widths now use steadier reading sizes, reducing the uneven look across different column combinations.
• CSV follows the table: CSV export follows the currently visible columns and their order.

Navigation Improvements

• P-h Diagram is now a top-level tool: The previous property calculator entry has been renamed to P-h Diagram for clearer navigation.
• Property Lookup has its own entry: Saturation property analysis is now available directly from the main navigation as Property Lookup.
• Less duplicate navigation: Property tools no longer show a separate internal Graph/Table switcher, keeping navigation focused in the header.

New Features

• Reduced pressure metric: Saturation analysis can now show reduced pressure as a selectable property in the table, chart, and CSV export.
• Base-fluid percentage comparison: In single-temperature multi-fluid lookups, the primary fluid stays first as the base and other fluids show their relative difference below each comparable value.
• Comparison-aware chart tooltip: Multi-fluid chart tooltips now place the base fluid first and show each other fluid's percentage difference against it.

Workflow Improvements

• Primary fluid stays visible: The primary fluid cannot be hidden in saturation analysis, avoiding ambiguity about which fluid is used as the comparison base.
• Clearer viscosity wording: Saturation viscosity labels now explicitly say dynamic viscosity in both English and Chinese.

New Features

• Single-temperature saturation lookup: Enter a saturation temperature to switch the table from a full sweep into a focused one-point lookup.
• Multi-fluid point comparison: When multiple fluids are visible, the lookup table shows one row per fluid so values can be compared at the same saturation temperature.
• Matching chart markers: The trend chart keeps the full curves and adds same-color markers at the lookup point for each visible fluid.

Workflow Improvements

• Focused CSV export: Export the current single-temperature comparison table with fluid names and saturation temperature included.
• Clearer lookup input: The temperature field now uses example-style placeholder text so it does not look like a prefilled value.

New Features

• Vapor cycle workspace released: Added a dedicated vapor-compression cycle tool for quick refrigeration-cycle checks.
• Interactive P-h cycle view: The cycle is shown on a P-h chart with state points and native zoom controls.

Calculation & Results

• Core cycle inputs in one panel: Set refrigerant, evaporator and condenser pressure, superheat, subcooling, efficiencies, displacement, mass flow, and cooling capacity.
• Linked capacity and mass flow: Cooling capacity and mass flow stay connected, so either value can drive the cycle result.
• Clear summary metrics: Review COP, compressor work and power, compressor speed, cooling capacity, mass flow, and condenser heat at a glance.

Workflow Improvements

• Component detail panel: Inspect compressor, condenser, expansion valve, and evaporator details without leaving the workspace.
• Safer unit switching: Display units can be changed without changing the internal calculation basis.

New Features

• Saturation analysis released: Added a dedicated saturation page for saturation tables, trend charts, and CSV export.
• Better multi-fluid saturation comparison: Comparison curves now follow each fluid's own valid saturation range, which avoids distorted segments in mixed-fluid views.

Chart & Interaction Improvements

• Native zoom across Props charts: P-h, T-s, and saturation charts now use native chart zoom behavior for smoother range control.
• Desktop X/Y sliders added: On desktop, charts now support direct X-axis and Y-axis range adjustment with visible sliders.
• Unit switching added to saturation tables: Common dimensional properties can now switch display units directly from the table header, with table values, charts, and CSV export staying in sync.
• Clearer unit dropdown affordance: Columns with switchable units now show a dedicated small dropdown trigger in the header, which separates metric selection from unit selection more clearly.

UX Improvements

• Cleaner chart headers: P-h and T-s controls are now more compact and aligned into a cleaner top row.
• More natural zoom workflow: Range changes are easier to inspect and adjust, especially when comparing multiple fluids.
• Long unit labels behave better on small screens: Saturation table headers now use controlled wrapping for longer combined unit labels, which reduces horizontal crowding on narrow layouts.
• Unit triggers are easier to discover: The small header arrow now has clearer hover and active feedback, making the clickable unit control easier to spot.

New Features

• T-S diagram released: Added a T-S view for temperature-entropy visualization.
• Zoom modes completed: The T-S diagram now supports Off / XY / X / Y zoom with reset support.

Chart & Interaction Improvements

• Multi-fluid usability improvements: Improved chart behavior and readability in multi-fluid scenarios.
• Cleaner dome rendering: Refined the saturation-dome apex so the shape closes more naturally.

UX Improvements

• Better first-screen layout: Adjusted the chart workspace so key information is easier to see on first paint.
• More stable chart notes interaction: Expanding or collapsing chart notes no longer causes obvious chart viewport jumps.

New Features

• Multi-fluid overlay charting: Compare multiple fluids on the same P-h diagram.
• Per-fluid visibility control: Show or hide each fluid independently, including the primary fluid.
• Primary fluid switching: Switch the primary fluid anytime; the left input panel and calculations follow it.
• In-place fluid replacement: Click a fluid name to replace the fluid in that slot, without remove-and-add steps.

Interaction & Visualization Improvements

• Unified fluid segment bar: Continuous segmented controls with auto-wrap, supporting up to 5 fluids.
• Unified phase color system: Liquid, two-phase, gas, supercritical, and unknown states now use a consistent palette across result badges, ΔT highlighting, and state points on the P-h diagram.
• Cleaner two-phase labeling: When the state is saturated and ΔT = 0, the amber input styling remains, but the SAT tag is no longer shown to reduce visual noise.
• Clearer chart title: The title now shows visible fluid names directly, with colors matched to their curves.
• Improved tooltip modes:
  • Single-curve mode shows the fluid name on the first line.
  • Multi-curve mode uses a distinct background style for quick mode recognition.

Stability & UX Improvements

• Improved interaction consistency and keyboard accessibility in multi-fluid scenarios.
• Fixed visual inconsistencies in multi-row segment layout and hover states.
• Consolidated phase color and theme-token usage to reduce scattered hardcoded styles and improve maintainability, validation, and future extension.

Now Available

The new Fluidtool platform is now online with core engineering tools:

• Fluid Data: Core fluid-property calculations for daily engineering use
• Humid Air: Humid-air property calculations and quick reference tables
• Documentation Center: Structured docs for usage guides and formula references

Experience Improvements

• Improved navigation and overall site stability
• Better bilingual support for English and Chinese
• Clearer structure for tools and documentation pages

Notes for Users

• Pages that are not ready for public use are temporarily hidden
• Core tool and docs links remain stable for regular usage
• Future product updates will continue to be published here