Keywarm Design Institute Expert Selector (V2.3-EN)

Use: Industrial buildings / Warehouses & logistics | Stage: Concept / Preliminary design | Core: Hard gas-boundary constraints + system path + closest-to-load selection (≤1% undersizing allowed)
Optional ΔT method available so the target indoor temperature can affect Q (closer to design-institute practice).
HTML Version:-
0Step 0 | Inputs (Minimum Set)
External Version: Fewer Inputs + Clear Engineering Logic
Note: Ti is written into the design-basis paragraph; if Delta-T mode is enabled, Ti also affects Q.
Apply Delta-T Correction (Design Institute Mode, Optional)
When enabled: Q = Q_base × (ΔT/ΔT_ref), where ΔT = Ti − To; ΔT_ref uses Ti_ref = 12°C and To_ref = default To of the climate zone.
To avoid double counting, the climate factor is automatically fixed at 1.00 (hidden in the UI).
Expand: Method Explanation (External / Client-facing)
Door / Air exchange levels
Normal 1.00: Few doors, infrequent opening, no mandatory ventilation.
Large 1.10: Clear logistics peaks, 1–2 large doors frequently open, local exhaust / make-up air.
Very Large 1.20: Multiple high doors open for long periods, major ventilation / negative-pressure conditions.
Delta-T Method (Optional)
Suitable when owners/designers strongly care about the target indoor temperature.
To offers 6 options (-5/-10/-15/-20/-30/-40°C) and can be selected manually.
Once Delta-T mode is enabled, the climate factor is fixed at 1.00 to avoid double correction.
Note: This tool is for concept / preliminary design sizing and does not replace code-based calculations; continuous calibration with real project feedback is recommended.
2Step 2–4 | Gas Boundary → System Route → Secondary Equipment (Linked Filtering)
Avoid Invalid Combinations
If you are unsure which route to choose:
• Many doors / high space / clear zones → start with radiant
• Whole-space heating / duct system available → start with warm-air
5Step 5–6 | Output (Top1 + Top2 + Design Narrative)
Can be pasted directly into concept / preliminary design text
Complete the following first: Step 0 input → calculate Q → select route → generate recommended combinations.
You will get: Top1 recommendation + Top2 alternative + a directly pasteable design narrative.
Reference: Master Rulebook "Keywarm Design Institute Heating Selection Logic V2.0" | HTML Tool: Expert V2.3-EN (No quantity limit + prefer larger models)
Disclaimer: This tool is for concept / preliminary design reference only; final design parameters and equipment selection shall be confirmed by the design institute based on codes, software calculations, and real project conditions.
Live Summary
Key assumptions at a glance
Building Type
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Area A
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Height H
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Indoor Target Ti
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Insulation Level
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Climate Zone
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Door/Air Exchange
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Gas Boundary
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Calculated Heat Load Q
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Step 1 Formula (Coefficient Method)
Q = A × Base heat index × Height factor × Insulation factor × Climate factor × Door/Air exchange factor ÷ 1000 (kW)
Expand: Step 2 Hard Constraints Quick Check
Gas not allowed indoors + Radiant Only low-intensity large-tube 200/250/300 is allowed.
Gas not allowed indoors + Warm-Air Only outdoor installation is allowed; then choose outdoor tubular / outdoor drum by duct preference.
Gas allowed indoors Radiant / warm-air routes remain open (still select according to space and airflow organization).