THERMGLASS

Refrigeration Energy Analysis

Refrigeration VIG ROI Engine

Calculate compressor energy savings, simple payback, and carbon reduction for THERMGLASS VIG in walk-in coolers, freezer cases, and refrigerated display cases. Based on ASHRAE Refrigeration Handbook 2022 conduction model.

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System Inputs

Glass-door frozen food cases (ice cream, frozen meals)

Typical reach-in door glass: 0.75–1.0 m² per door

Standalone VIG typical: 0.45–0.55 W/m²·K · Hybrid VIG: 0.30–0.40

Typical VIG door premium over standard double-pane: $300–$500 per door

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Results

ASHRAE Refrig. 2022
ΔT: 40°CHours/day: 24Total area: 8.4 m²U delta: 1.7 W/m²·K

Annual Energy Savings

Annual cost savings$240per year
Compressor energy saved2.0 MWhper year
Baseline heat gain6.5 MWhbaseline compressor load/yr
VIG heat gain1.5 MWhVIG compressor load/yr

Payback & Investment

Simple payback15.8 yearsLong — consider hybrid VIG or higher energy cost scenario
Incremental cost$3.8kVIG premium over baseline

Net Present Value

NPV at 10 yr−$1.9k
NPV at 15 yr−$1.3k

NPV = discounted cumulative savings minus incremental cost. Positive = net financial benefit over the period.

Carbon Impact

Annual CO₂ reduction773 kg CO2per year
Lifetime CO₂ (15 yr)11.6 t CO2total avoided emissions

Steady-state conduction model per ASHRAE Refrigeration Handbook 2022 §14. Heat gain = U × A × ΔT × hours/day × 365. Compressor energy = heat gain ÷ COP. Covers conduction only — actual savings may be higher due to reduced defrost cycles and elimination of anti-sweat heater wires.

Export PDF Report

3-page branded report — cover, results, and methodology

$240Annual savings
2.0 MWhEnergy saved
15.8 yrSimple payback
773 kg CO2CO₂ avoided/yr

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