ICS Commercial Calculator Suite    2-115+ Tons Coverage

TXV Sizing Calculator
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Purpose: Verify TXV sizing for commercial refrigeration systems

Capacity: 24,000 BTU/hr to 1,500,000+ BTU/hr (2-125+ tons)

Key Features:
  • Commercial refrigerant calculations (R-410A, R-22, R-134a, R-407C)
  • Pressure drop analysis for large systems
  • Prevents floodback in large commercial units
  • Real-time sizing validation
Airflow Calculator
/airflowcalc

Purpose: Quick airflow estimation for commercial systems

Capacity: All commercial sizes

Key Features:
  • Standard CFM = BTU/hr ÷ (1.08 × ΔT) calculations
  • Commercial CFM per ton analysis (350-575 CFM/ton range)
  • Static pressure evaluation for commercial ductwork
  • R-22 aging system analysis for large installations
Commercial Airflow Diagnostic
/airflowdiagnostic

Purpose: Advanced diagnostic engine for comprehensive commercial analysis

Capacity: 2-115+ tons with size-specific thresholds

Advanced Features:
  • Commercial-Specific Diagnostics: Different algorithms for all system sizes
  • Code Compliance Checking: ASHRAE 62.1 ventilation requirements
  • Business Impact Analysis: Cost calculations, payback periods
  • Application-Specific Standards: Office, retail, healthcare, manufacturing
  • Commercial Cost Analysis: Energy costs, demand charges
Commercial Subcool Calculator
/subcoolcalc

Purpose: Precision refrigerant charge analysis for commercial systems

Capacity: 2-115+ tons with size-specific diagnostic thresholds

Commercial Refrigerant Support:
R-410A
Standard commercial
R-22
Legacy systems
R-134a
Chiller applications
R-407C
R-22 replacement
R-32
High efficiency (A2L)
R-454B
Low GWP (A2L)
Advanced Features:
  • Bubble Point Calculation with accurate P-T relationships
  • Commercial Diagnostics with charge level assessment (60-130%)
  • Performance Impact Analysis with capacity/efficiency loss calculations
  • Business Impact Analysis with annual energy cost calculations
  • System Health Scoring (0-100% overall condition)
  • Professional Diagnostic Categories (Critical/Performance/Normal)
Refrigerant P-T Calculator
/rptcalc

Purpose: Professional pressure-temperature lookup for field diagnostics and design calculations

Capacity: 14 commercial refrigerants with bidirectional conversion capabilities

Core Functionality:
Pressure → Temperature
Field diagnostic mode - most common use case
Temperature → Pressure
Design/calculation mode for system planning
Smart Interpolation Engine:
Exact
Direct data point match
Interpolated
Linear calculation between points
Extrapolated
Outside normal range - warning
Professional Features:
  • Real-time calculation with immediate updates
  • PSIG/PSIA conversion handling
  • System type tracking (RTU, Split, Chiller, etc.)
  • Capacity documentation and application notes
  • Safety classifications (A1/A2L) and GWP awareness
  • Operating range validation (-48°F to 120°F)
Wet Bulb to Enthalpy Calculator NEW
/wbenthalpy

Purpose: Psychrometric conversions for field measurements and design verification

Range: 35°F to 85°F wet bulb temperature with 510 precise data points

Bidirectional Conversion:
Wet Bulb → Enthalpy
Field measurements mode - convert sensor readings
Enthalpy → Wet Bulb
Design verification mode - confirm specifications
Enhanced Psychrometric Calculations:
Sensible Heat
Components
Latent Heat
Components
Dew Point
Temperature
Humidity Ratio
Grains/lb
Data Quality Indicators:
Exact Match
Direct data point detection
Interpolated
Linear interpolation with error estimates
Extrapolated
Out-of-range warnings
Professional Features:
  • Interpolation Engine: 510 data points (35°F to 85°F in 0.1°F increments)
  • Psychrometric Formulas: Industry-standard calculations for all air properties
  • Auto-calculation: Smooth UX with immediate results on valid input
  • System Context: Measurement location tracking and equipment integration
  • Operating Analysis: Intelligent notes based on wet bulb ranges
  • Capacity Calculations: Total cooling capacity and SHR when applicable
Small Commercial (2-10 tons)

Applications: Small offices, retail shops, restaurants

Airflow
350-450 CFM/ton
Static Pressure
0.8-1.5" WC
Cost/Ton
$1,200

Basic commercial analysis with residential-like simplicity

Medium Commercial (10-30 tons)

Applications: Medium offices, retail stores, schools

Airflow
375-525 CFM/ton
Static Pressure
1.0-2.0" WC
Cost/Ton
$1,000

Enhanced analysis with zone considerations

Large Commercial (30-75 tons)

Applications: Large offices, hospitals, shopping centers

Airflow
400-550 CFM/ton
Static Pressure
1.5-2.5" WC
Cost/Ton
$900

Complex system analysis with economizer and VAV support

Industrial (75+ tons)

Applications: Manufacturing, large warehouses, data centers

Airflow
425-575 CFM/ton
Static Pressure
2.0-3.0" WC
Cost/Ton
$800

Advanced analysis with process-specific requirements

Subcool Ranges by System Type
System Type Optimal Range Characteristics
Packaged Rooftop Unit8-18°FStandard commercial cooling
Air Cooled Chiller5-12°FPrecise temperature control
Water Cooled Chiller4-10°FHigh efficiency operation
Heat Pump6-16°FDual mode operation
Process Cooling10-20°FIndustrial applications
Data Center Cooling8-16°FReliable operation critical
Supermarket Refrigeration12-25°FLarge refrigerant charges
Industrial Refrigeration15-30°FHigh capacity systems
Airflow Standards by Application
Application CFM/Person CFM/Sq Ft Typical Occupancy
Office Building200.06100 sq ft/person
Retail150.1230 sq ft/person
Restaurant200.1870 sq ft/person
Manufacturing200.50500 sq ft/person
Warehouse200.052000 sq ft/person
Healthcare250.18120 sq ft/person
Static Pressure Guidelines by Size
System Size Normal Range Maximum Warning Level
2-10 tons 0.8-1.2" WC 1.5" WC 1.3" WC
10-30 tons 1.0-1.5" WC 2.0" WC 1.7" WC
30-75 tons 1.2-2.0" WC 2.5" WC 2.2" WC
75+ tons 1.5-2.5" WC 3.0" WC 2.7" WC
P-T Chart Reference & Refrigerant Properties
Sample P-T Data Points (Common Temperatures)
Refrigerant 32°F (PSIG) 70°F (PSIG) 105°F (PSIG) 130°F (PSIG)
R-410A 103.5 201.4 363.9 504.1
R-22 43.0 120.9 241.9 345.0
R-134A 9.9 70.8 142.4 205.0
R-32 69.1 170.2 331.9 469.4
Refrigerant Categories & Safety Classifications
Refrigerant Safety Class GWP Common Application Status
R-410A A1 2088 Standard commercial AC Current
R-22 A1 1810 Legacy systems Phaseout
R-134A A1 1430 Chillers Transitioning
R-32 A2L 675 High efficiency systems Emerging
R-454B A2L 466 R-410A replacement Future
Psychrometric Reference Data
Typical Wet Bulb Temperature Ranges
Condition Wet Bulb (°F) Enthalpy (BTU/lb) Application
Winter Design 35-45 15-20 Heating load calc
Spring/Fall 50-65 21-28 Economizer operation
Summer Design 70-78 31-38 Cooling load calc
Extreme Summer 79-85 39-45 Peak load conditions
Common Measurement Locations
Return Air
Typical: 75°F DB, 62°F WB, 26.5 BTU/lb
Outside Air (Summer)
Design: 95°F DB, 78°F WB, 38.1 BTU/lb
Supply Air
Typical: 55°F DB, 53°F WB, 21.8 BTU/lb
Mixed Air
Variable: Based on OA/RA mix ratio
Key Psychrometric Relationships
Enthalpy Formula
h = 0.240 × DB + W × (1061 + 0.444 × DB)

Where: h = enthalpy (BTU/lb), DB = dry bulb (°F), W = humidity ratio

Cooling Capacity
Q = CFM × 4.5 × Δh

Where: Q = BTU/hr, Δh = enthalpy difference

Refrigerant Cost Analysis
Refrigerant Cost/lb Category Service Cost Range
R-410A $12.50 Standard $350 - $6,000
R-22 $45.00 Expensive $525 - $6,000
R-454B $35.00 New Tech $525 - $6,000
R-134a $15.00 Chiller $350 - $3,750
Common Issues by Size
Small Commercial (2-10 tons)
  • Similar to residential but higher capacity
  • Focus on filter maintenance and basic airflow
  • Simple economizer systems if present
Medium Commercial (10-30 tons)
  • Multi-zone considerations
  • Economizer complexity increases
  • Static pressure becomes more critical
  • Demand charge considerations
Large Commercial (30-75 tons)
  • Complex ductwork systems
  • VAV considerations
  • Code compliance critical
  • Energy management focus
  • Professional maintenance required
Industrial (75+ tons)
  • Process-specific requirements
  • High static pressure systems
  • Specialized filtration needs
  • Peak demand management critical
  • Planned maintenance essential

©2025 Interior Climate Solutions

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