Heat Exchanger Insulation: Heat Loss & Savings

Removable heat-exchanger insulation covers hot shells, heads or plate frames while allowing access for cleaning and inspection. When comparing heat-exchanger jackets or blankets, check nozzle clearances, supports and the sequence for opening the unit. Inzonex designs fitted modular insulation around those requirements.

Direct answer: In this simplified reference model, bare surface heat-loss flux is roughly 1,000 W/m² at 120 °C and 1,800 W/m² at 200 °C, with 20 °C ambient air. The tables compare bare and insulated scenarios; they are not measured results or a guarantee for every installation. Confirm geometry, coverage and the required surface-temperature target for the project.

Heat loss vs insulated — by surface temperature

Surface temp	Bare loss	Insulated	Outer surface	Reduction
100 °C	800 W/m²	74 W/m²	27 °C	90.7%
120 °C	1,000 W/m²	97 W/m²	30 °C	90.3%
150 °C	1,300 W/m²	134 W/m²	33 °C	89.7%
200 °C	1,800 W/m²	204 W/m²	40 °C	88.7%

Calculated per-m² flat-surface screening reference: combined external h = 10 W/m²·K, 50 mm Lamella (≤220 °C) or 100 mm Wired mat (>220 °C), 20 °C ambient. Multiply by the bare area. See the calculation method, a measured boiler installation and the Inzonex survey-to-manufacture process. The boiler case documents a different application, not measured performance for this equipment.

Worked examples (per year, 8,000 h, natural gas)

Item	Heat saved	Energy/yr	CO₂/yr	€ saved/yr
A shell-and-tube heat exchanger (4 m², 120 °C)	3.6 kW	34 MWh	6.9 t	€1,972
A plate heat exchanger (2 m², 110 °C)	1.6 kW	15 MWh	3.1 t	€889

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FAQ

How much heat does a bare heat exchanger lose?

Multiply the bare-loss flux in the reference table by the complete hot external surface area. The worked examples report heat saved after insulation, not bare heat loss: about 3.6 kW for the illustrated shell-and-tube exchanger and 1.6 kW for the plate exchanger. Annual results use 8,000 operating hours and the stated calculation assumptions.

Can you insulate shell-and-tube and similar?

Yes. Inzonex designs fitted modules around the shell, head or plate frame, leaving required nozzles, controls and access points clear. Snap-button fasteners and magnets where applicable allow the relevant modules to be removed and refitted for the maintenance task. The separate functional zipper provides access to the insulation core for cleaning or replacement.

How much does heat exchanger insulation save?

Inzonex projects can achieve up to 96% heat-loss reduction, depending on equipment, coverage and operating conditions. The worked example on this page uses its stated assumptions; it is not a quoted saving for every installation. Enter your own operating hours, energy price and installed cost to estimate annual savings and payback.

What insulation thickness is used?

The reference calculations use 50 mm mineral-wool Lamella up to 220 °C and 100 mm Wired mat above 220 °C. These are calculation scenarios, not a universal specification. Select the complete assembly for the equipment temperature, ambient conditions and the required outer-surface temperature. Inzonex projects target ≤45 °C; some duties require a different thickness or material to meet that target.