Does a Panipat stenter get 5 to 7% or 5 to 9% from energy efficient fans?

The Energy and Resources Institute (TERI) Panipat profile says efficient fans may give an additional saving of up to 5 to 7% of stenter electricity in its text, and 5 to 9% in its table. It also prints 15 to 20% for a variable frequency drive on the same fans, and its text calls the fan saving 'additional'.

The stenter as TERI describes it

• Home furnishing stenters have 6 to 8 chambers; some large units have 12. Heat comes from thermic fluid, mostly from pet coke fired heaters.
• Chamber blowers have dual speed standard efficiency motors, and fan speed is independent of chamber temperature. Chamber insulation is poor.
• Most stenters have a three-way valve, so thermic fluid keeps circulating at the rated volume even after the set temperature is reached.

Where the profile gives two figures

• Text: 'Use of energy efficient fans may also give additional saving up to 5-7 % in electricity consumption of stenters.'
• Table: energy efficient air circulation fans, design efficiency up to 65% now and up to 80% after, saving 5 to 9%, payback up to 12 months.
• Other lines in the same table: a variable frequency drive (VFD) on chamber fans, 15 to 20%, up to 9 months. A two-way valve and VFD on the thermic fluid pump, 15 to 20% of pumping power plus 2 to 3% of heat, up to 18 months.

Which one to use

The profile does not say why the two differ. Take 5 to 7% as the cautious end and 5 to 9% as the upper end, and make the supplier state the base: whole stenter electricity or fan power only.

A check on the base, our arithmetic: for the same airflow, shaft power falls by 1 minus 65/80 = 18.75% when fan efficiency goes from 65% to 80%. If the printed 5 to 9% were a share of the whole stenter's electricity, the fans would be 5 / 18.75 = 27% to 9 / 18.75 = 48% of it. The profile prints no fan share, so test this on your own meter.

Our reading: the two overlap, so do not add them without a base from the maker; the profile calls the fan saving 'additional'. Both act on fan power, so the second would apply to what the first leaves.

What decides it in your unit

• Sub-meter the blower group for a week at a normal load, or read the clamp-meter input in kilowatts (kW) for each chamber fan.
• Ask the maker for the guaranteed fan efficiency at your airflow, not the design point.
• The thermic fluid heater fuel is a separate line. Fans change electricity; the pet coke changes only if heat use falls.

Example: stenter electricity of 120,000 kilowatt hours (kWh) a year

• Efficient fans at 5% to 9%: 6,000 to 10,800 kWh saved
• Text figure, 5% to 7%: 6,000 to 8,400 kWh saved
• Carbon dioxide (CO2) at 0.675 kilograms (kg) a kWh for financial year (FY) 2025-26: 6,000 to 10,800 kWh gives 4,050 to 7,290 kg
• A drive at 15% to 20% on fans alone, if fans were the whole load: 18,000 to 24,000 kWh

The 120,000 kWh is an example value, and the last line is an upper bound that assumes fans are all the stenter's electricity. Real fan shares are lower.

What Senseible does here

Senseible reads electricity bills into monthly records. Fan-level figures need a sub-meter.

• Stenter fuel and carbon per metre
• Surat stenter blower drive or new stenter
• Panipat compressor pressure saving

Sources: TERI, Energy Profile: Panipat Textile Cluster (SAMEEEKSHA), CEA CO2 Baseline Database, version 22.0

Last reviewed 2026-11-06. Savings and paybacks are TERI's 2014-15 planning figures. Confirm fan efficiency and the base of any quoted saving with the supplier before ordering.