Industrial heat pumps for food and beverage processing plants in India

A food and beverage processing plant’s heating duties are mostly hot water, and most of them sit inside the band a Tetra Heat Pump serves directly: HTST pasteurisation at 72 to 75°C, LTLT at 63°C, clean-in-place caustic at 70 to 85°C, blanching up to 98°C and evaporator first effects at 65 to 75°C, in place of PNG, furnace oil or diesel firing. Retort sterilisation at 121°C on saturated steam, spray dryer inlet air at 180 to 200°C, and frying and baking at 160 to 220°C are out of range and stay on the incumbent system. The hygiene question is answered first by the architecture: the heat pump never touches product, it makes hot water that feeds the plate exchanger you already have, so nothing in the product path changes. Tetra Heat Pump is an industrial heat pump manufactured in India by Promethean Energy Private Limited; it is not a packaging system and is not connected with Tetra Pak.

Which food and beverage heating duties suit a heat pump?

Most of a food and beverage plant’s thermal demand is hot water below 100°C, which is where a heat pump is strongest and a fired boiler weakest. Five duties are in range and three are not; the process temperature table above lists each with its band.

Tetra Heat Pump units are built by Promethean Energy Private Limited in air source, water source and cascade configurations, including R1234ze and R245fa refrigerants, deliver continuous output up to 120°C with ±0.5°C control, and reach 1,450 kW in a single machine, with multi-unit projects to 5 MW. That covers all five in-range duties and none of the three that are out; the full specification is here.

The Indian Boiler Regulations exemption applies below 100°C, and every in-range duty here is 63 to 98°C. On a hot water loop that circuit is not a registered boiler, which takes the certified attendant on every shift and the annual inspection shutdown with it.

Pasteurisation: HTST at 72 to 75°C and LTLT at 63°C

HTST holds product at 72 to 75°C and LTLT at 63°C, but the heat pump heats neither. It heats the water loop feeding the plate heat exchanger, and that loop always runs hotter than the product setpoint, because the exchanger needs an approach temperature to drive heat across the plates. The figure that sizes the machine is therefore your loop supply temperature, which you can read off the loop instrumentation.

Holding the setpoint is a control question rather than a capacity one. The diverter valve protects the product, but a heat pump on a buffered loop with ±0.5°C control gives the pasteuriser a steadier supply than a boiler cycling against a modulating valve.

Clean-in-place at 70 to 85°C

CIP caustic circulates at 70 to 85°C and is the biggest single hot water demand on most sites. It is also what usually sizes the machine, which surprises people who came into the project thinking about pasteurisation.

Shape, not size, is the reason. CIP arrives as a short, high-rate draw at the end of a run, often on several circuits at once, then stops. Size for that peak and the machine spends the rest of the week cycling badly at part load. Size for the base load, buffer the peak in stored hot water and refill between washes, and you buy a smaller machine running closer to its design point.

Buffer volume is therefore a design decision, not an accessory. Before sizing, settle how many circuits run at once on your worst shift, how long the caustic phase holds, and what your incoming water temperature is at recharge.

Evaporator first effects at 65 to 75°C

The first effects of a multiple-effect evaporator run at 65 to 75°C, the most under-served duty on the list. Juice concentration, sauce and puree lines, and anything being reduced to a concentrate all run such an evaporator, and yet no vendor page in India covers this duty.

It is also the best-shaped load a food plant can offer, continuous while the line runs rather than batched like CIP. Capital equipment earns its return on running hours, so a continuous duty is worth more than a larger intermittent one.

The carve-out applies to powder lines. Later effects stay in range; the drying step at the end of the train does not, because spray dryer inlet air at 180 to 200°C is a fired duty. Concentrate to the dryer, then hand over.

Hygiene, HACCP and the product path

The objection that stops these projects is hygiene, and the answer to it is architectural before it is documentary. The heat pump makes hot water, and that water goes into the same plate heat exchanger, jacket or CIP set your plant runs today. Product stays in the circuit it is already in, behind the same exchanger surface your HACCP plan covers. Nothing enters the product path, because what changes is how the water gets hot and not what it then touches, and your quality team can verify that from the P&ID.

Two things still sit with the buyer. Wetted materials and surface finish on any exchanger inside your hygienic boundary are a specification you set from your own product contact rules and customer audits, so put them in the enquiry. The paperwork is yours too, because a utility is being modified even where the product path is not. Where your site or a customer audit requires the equipment itself to be certified, Promethean Energy obtains that certification for the project, to the standard you set, as it has on previous projects. Sites under stricter change control, pharmaceutical plants in particular, land the heat pump outside the qualified perimeter and treat it as a hot water source only.

Refrigeration heat recovery as your heat source

A food or beverage plant runs large, continuous refrigeration for chilling, cold storage and freezing, and all of it rejects heat at the condenser while the plant pays gas or oil to make heat elsewhere. You pay twice, and that pairing is the structural reason the sector suits a heat pump.

The clearest evidence is a dairy. Indian dairies run around 38% of plant energy on pasteurisation and 19% on refrigeration rejecting heat, simultaneously. A 2026 peer-reviewed study of an Indian dairy plant reported a 344 kW heat pump at COP 2.29 with a 4.93-year payback, improving to COP 3.08 and 3.07 years when the coupling temperature between the refrigeration side and the heat pump was raised to 50°C. The improvement came from the coupling, not a different machine.

So the stream you pick moves the number more than the machine you pick, because COP depends on the lift. Tetra Heat Pump water source units reach COP 4.5 to 5.2 at 60°C output, and performance falls as output rises toward the 120°C ceiling; a warm rejected stream shortens that lift from the other end.

Source stream	Availability	What it does for the machine	Watch out for
Refrigeration condenser rejection	Continuous on most food plants, since the refrigeration rarely stops	The highest-COP configuration on the site, and the reason water source beats air source here	The grade falls as you draw from it, and it disappears when the refrigeration plant stops
Compressor jacket and oil cooling	Tracks the compressor, so the same hours as the refrigeration	Steady, and already piped to a cooler in most plants	Modest volume. A supplement to the condenser, not a base source
Process effluent to drain	Follows production, with gaps between batches and at changeover	Recovers heat that has already been paid for once	Fouling and solids. Needs a cleanable exchanger and a strainer regime maintenance will follow
Wash and CIP return water	Cycle driven, arriving as peaks rather than a steady flow	Useful for preheating the buffer store between washes	Caustic carryover and material compatibility on the recovery exchanger
Ambient air	Always available, but the grade moves with the season and the shift	The fallback where no rejected stream is close enough to pipe economically	A winter morning start is the worst case, and the condition the machine gets sized on

Proximity decides more than size, because pipe runs, pumping and heat loss all cost money. Our integration services cover the hydraulic and controls side of the tie-in, including BMS, SCADA and PLC connection over Modbus and BACnet.

What fuel are you replacing?

The saving is not a property of the machine. It is the ratio between your electricity price and what a useful kilowatt-hour of heat costs you as fuel today. An industrial heat pump at COP 3.5 on the Maharashtra HT-I energy charge of ₹8.44 delivers heat at ₹2.41 per useful kWh thermal, and every in-range duty here is 63 to 98°C, where a COP near 3.5 is plausible.

Incumbent fuel	Price and date	Cost per useful kWh thermal	Breakeven COP	Verdict at COP 3.5
PNG, Gujarat general industrial	₹68 per SCM, June 2026	₹7.24	1.17	67% cheaper
Furnace oil	₹71.99 per kg, 1 August 2026	₹7.70	1.10	69% cheaper
Light diesel oil	₹107.65 per litre, 1 August 2026	₹12.58	0.67	The widest gap on the list
Electric resistance	₹8.44 per unit, Maharashtra HT-I	₹8.70	Just under 1	Any working machine beats it
Biomass briquette	₹8,500 per tonne, 2026	₹2.54	3.33	5% cheaper, which is not a cost case
Coal, delivered	₹6,000 per tonne	₹1.94	4.35	The heat pump loses by 24%

That middle column is our arithmetic, not a published index: 1 kWh is 860 kcal, gas at 9,500 kcal per SCM, furnace oil at 10,050 kcal per kg, coal at 3,800 kcal per kg, and boiler efficiency of 85% on gas, 80% on oil, 70 to 72% on solid fuel and 97% on electric resistance. The LDO and briquette calorific values are indicative and were not independently verified. Maharashtra HT-I bills per kVAh, so poor power factor costs more per useful unit than ₹8.44.

Read it as three markets. Against PNG, furnace oil and diesel, breakeven sits at or below 1.2 and there is no sensitivity analysis to lose; across those fuels Tetra Heat Pump puts the saving at 40 to 70%. Against briquette the margin is 5%, which will not survive a bad month on the tariff. Against delivered coal the heat pump loses, and the reason to leave solid fuel is compliance, air quality, labour and customer audit.

Test the case against the 46% figure, the saving at COP 3.5 against pre-crisis gas at ₹41.60 per SCM. That answers the board member asking what happens if gas comes back down: the case narrows and does not invert.

ADEETIE is worth a call. It runs to FY2027-28, names food processing among its 14 eligible sectors, and funds the investment-grade audit and the detailed project report alongside an interest subvention for MSMEs with a Udyam ID in a notified cluster. Whether an industrial heat pump sits on its approved technology list should be confirmed with the portal rather than assumed.

Where a heat pump is the wrong answer here

There are three duties and one type of plant for which it is the wrong answer, and they are named plainly below.

Retort sterilisation at 121°C on saturated steam is out, and temperature is only part of why: retorts need saturated steam at pressure. Spray drying is out, because dryer inlet air at 180 to 200°C is beyond any industrial heat pump, which makes a powder plant a partial-scope project at best: concentrate with the heat pump, dry with what you have. Frying and baking at 160 to 220°C are direct-fired and stay that way.

The fourth case is not a temperature. A heavily seasonal plant, a fruit processor running a short annual campaign for instance, has the physics on its side and the running hours against it, and a machine idle for most of the year rarely clears the hurdle. Where demand is peaky rather than continuous, our hospitality page suits it better.

Working it out on your plant

Three things settle it, none needing a site visit. List your heating duties at the temperature each actually runs, not the design figure. Find the rejected heat, condensers first. Then put your electricity tariff and fuel price into the ROI calculator to see where breakeven lands.

If it looks worth pursuing, the next step is your load profile rather than a quotation. There is broader temperature detail in our guide to heat pump water heaters in industry, comparable retrofits under case studies, including a dairy meeting its hot water loop from refrigeration it was already rejecting, and more than 200 installations behind the equipment. To start with your process list, get in touch.