Valves on the feed line, insulated by Inzonex

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Valves on the feed line1.1 kWbare50 Winsulated95.5 %less

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Inzonex Modular Insulation · Feedwater set

Valves on the feed line

Five of them, each with more surface than the pipe it interrupts. Drag the divider: the right-hand side is a fitted removable module on this exact geometry.

Energy cost saving / year€56260 €/MWh fuel

Heat retained / year8.4 MWhAt 8,000 operating hours

Emissions avoided / year1.89 t CO₂e201.6 kg CO₂e/MWh fuel

Modelled outer surface26.6 °CBelow the 45 °C design target

Estimate: 5 × 0.1709 m² · 100 °C bare surface · 8,000 operating hours/year.

€562energy cost saving / year8.4 MWhretained

For your operating conditions

Your savings

Change any input and every figure recomputes. The defaults describe the equipment modelled here.

#calculator .main-inputs{display:none}JavaScript is off. The results show the published default scenario, not a live calculation. Enable JavaScript to change inputs. The reference tables and explanations remain available below.

Service

Flanged valves with a rising stem in a yoke and a handwheel. The handwheel arc, the stem and the gland all have to stay reachable, so the module stops at the bonnet.

Bare surface temperature

°C

Metal surface temperature. It sits a few degrees under the fluid temperature, not at it.

Bare area per valve

m²

The default is a provisional reference area, not a measured area for this model. Automatic DN lookup is unavailable until construction and pressure class are confirmed. Enter the verified external hot area, including physical fasteners where present. Exclude cold actuators and avoid counting shared surfaces twice.

Number of valves

Items of the same size and duty on this circuit.

Operating hours

h/yr

Hot standby counts: a standby unit full of hot water loses heat all year.

Insulation thickness

Lamella at λ 0.038 W/m·K. Past 50 mm each further layer returns less.

Ambient air

°C

Plant-room annual mean. The outdoor design temperature is a different figure.

Currency

The symbol on the price you enter and on the saving that comes back. No exchange rate is applied, so enter the fuel price in the currency you pick.

Fuel price

€/MWh

Delivered fuel, before boiler efficiency.

Insulation cost

€

Supply and fit for removable modules. Our default basis is 190 EUR/m² of covered surface. Replace it with your own quote in the currency you picked.

What this means

What it comes to.

At the modelled defaults, on this equipment.

Outer surface at 50 mm: 26.6 °CMeets the 45 °C design target
Bare metal at 100 °C: Above the 45 °C study targetContact risk depends on material and duration; no burn time is calculated
Simple payback: 3 monthsAt 190 EUR/m² supply and fit, saving €562 a year

Asked about valves on the feed line

Questions.

Answers distinguish modelled heat-loss estimates from equipment selection and service guidance.

How much heat does valves on the feed line lose on a feedwater line?

Modelled here: 5 × 0.1709 m² at 100 °C lose 1.1 kW bare, and 50 W with 50 mm of removable insulation. That is 95.5 per cent less.

Where does the area come from?

Is it safe to touch once insulated?

The module settles at 26.6 °C on these defaults, under our 45 °C touch-safe target. We set that target against the burn thresholds in EN ISO 13732-1.

What the numbers mean

How the figure is produced.

Steady-state estimate using convection, radiation and an insulation energy balance. Equivalence to a surveyed equipment model has not been established.

Shape: Horizontal cylinder, characteristic length 0.120 m
Convection: Churchill–Chu on air properties at film temperature
Radiation: Stefan–Boltzmann at emissivity 0.85
Bare-case allowance: ×1.20, assumed class multiplier; not an inventory of actual thermal bridges
Insulated case: Outer-surface energy balance, without temperature clamping. 45 °C is a design target; plus an assumed 5% heat-loss allowance for seams. The exterior uses a 0.3 m vertical-plate approximation; conductivity is constant.

The rest of the set

Other equipment

/ 01Feed pumps2 × 0.4000 m² at 100 °C · 993 W bare → 47 W covered · 95.3 % lessVertical multistage and close-coupledOpen the model / 03Flanged joints12 × 0.1709 m² at 100 °C · 2.6 kW bare → 120 W covered · 95.5 % lessRaised face, bolted pairsOpen the model

Area and temperature scenarios

Area at each service temperature.

Bare surface loss per item. Nothing here is interpolated — each cell is a separate solution of the same balance, at 20 °C ambient.

Reference scenario	Area m²	90 °C	95 °C	100 °C	105 °C	Insulated 100 °C	Cut
Area scenario 1Not a product size	0.1115	121 W	132 W	144 W	156 W	7 W	95.5 %
Area scenario 2Not a product size	0.1249	136 W	148 W	161 W	175 W	7 W	95.5 %
Area scenario 3Not a product size	0.1434	156 W	170 W	185 W	201 W	8 W	95.5 %
Area scenario 4Not a product size	0.1709	185 W	203 W	221 W	239 W	10 W	95.5 %
Area scenario 5Not a product size	0.1921	208 W	228 W	248 W	269 W	11 W	95.5 %
Area scenario 6Not a product size	0.2388	259 W	283 W	308 W	334 W	14 W	95.5 %
Area scenario 7Not a product size	0.2954	320 W	351 W	381 W	413 W	17 W	95.5 %
Area scenario 8Not a product size	0.3769	409 W	447 W	487 W	527 W	22 W	95.5 %
Area scenario 9Not a product size	0.5315	577 W	631 W	686 W	744 W	31 W	95.5 %
Area scenario 10Not a product size	0.7160	777 W	850 W	925 W	1.0 kW	42 W	95.5 %
Area scenario 11Not a product size	0.9595	1.0 kW	1.1 kW	1.2 kW	1.3 kW	56 W	95.5 %
Area scenario 12Not a product size	1.49	1.6 kW	1.8 kW	1.9 kW	2.1 kW	87 W	95.5 %

Illustrative areas, not verified DN-to-area mappings for this equipment. Replace the input with measured external geometry for a project calculation. Physical bolt, nut, flange and stem coverage must be checked separately.

Insulated column: 50 mm lamella at λ 0.038 W/m·K. Outer surface calculated without clamping. Our 45 °C design target is checked against the burn thresholds in EN ISO 13732-1

Handwheel, stem and yoke clearance