Ammonia-Based Mushroom Plant
An NH₃ plant in its own machine room, secondary coolant to Dutch shelf rooms, and the lowest electricity per kilogram from 1,000 kg/day up. MushroomWale engineers ammonia for the largest sites and prices it against DX and chilled water before recommending it.
When is an ammonia plant the right choice for a mushroom farm?
At 5,000 kg/day. In MushroomWale's engineering study the ammonia design is the lowest capital-plus-ten-years-of-electricity option there: ₹41.96 Cr against ₹44.77 Cr for DX, a 6.7% lead, with the lowest electricity per kilogram (1.41 kWh), the fewest rooms (19 against 55) and the smallest crew (98 against 169) — subject to two handling items the total excludes. At 500 and 1,000 kg/day DX rooms cost less over ten years; at 2,000 the two are 0.44% apart and the tender decides.
Where an ammonia plant fits
Lowest electricity per kg from 1,000 kg/day
1.17 kWh/kg at 1,000, 1.63 at 2,000 and 1.41 at 5,000 kg/day — the lowest of the three typologies at each, at a calibrated 0.85 kW per TR.
Fewest rooms, least land
At 5,000 kg/day: 19 Dutch shelf rooms on 16.5 acres, against 55 DX bag rooms on 21.1 acres.
Smallest crew
98 people at 5,000 kg/day against 169 on the DX design — shelf rooms fill, empty and pick mechanically.
Ammonia stays in the machine room
A secondary coolant carries the cold to the rooms. Ammonia never enters a growing room, a corridor or a cold store; detection and emergency ventilation are confined to the plant room.
The 5,000 kg/day verdict, and its two conditions
At 5,000 kg/day ammonia is lowest: ₹41.96 crore against DX's ₹44.77 crore over ten years, with the lowest electricity per kilogram (1.41 kWh), the fewest rooms (19 against 55), the least land (16.5 against 21.1 acres) and the smallest crew (98 against 169) — subject to two handling items the total excludes.
Licensing by capacity
An ammonia receiver above 1,000 litres needs a PESO pressure-vessel licence: that applies at 2,000 and 5,000 kg/day, not at 500 or 1,000.
- 500 kg/day · charge ≈ 301 kg · below the PESO threshold
- 1,000 kg/day · charge ≈ 399 kg · below the PESO threshold
- 2,000 kg/day · charge ≈ 831 kg · PESO licence required
- 5,000 kg/day · charge ≈ 1726 kg · PESO licence required
The 1,000 kg/day dispatch gap
At 1,000 kg/day the ammonia design has 4 production rooms (5 with the buffer room), filled 11.25 days apart, so 3 days in every 45-day cycle fall where every room is between flushes: no harvest those days. That is a dispatch-continuity issue caused by the room count, not by the refrigerant.
It does not arise at 500 kg/day (3 production rooms), 2,000 kg/day (7 production rooms), 5,000 kg/day (17 production rooms). A fifth production room closes it at 1,000.
All twelve designs, one metric
Capital cost plus ten years of electricity at ₹8 per kWh. Rate card v2.88 (1 September 2026); run 20 September 2026. Every priced total carries a ±12% band.
| Capacity | Refrigeration | Rooms | TR installed | kWh / kg | Capex | 10-yr electricity | 10-yr total | Acres | Crew |
|---|---|---|---|---|---|---|---|---|---|
| 500 kg/day | DX (direct expansion) lowest | 6 | 74 | 1.52 | ₹2.16 Cr | ₹2.13 Cr | ₹4.29 Cr | 1.5 | 18 |
| Chilled water (chiller) | 5 | 202 | 1.38 | ₹3.20 Cr | ₹1.94 Cr | ₹5.14 Cr* | 2.0 | 14 | |
| Ammonia (NH₃) | 4 | 140 | 1.79 | ₹4.07 Cr | ₹2.50 Cr | ₹6.57 Cr* | 2.2 | 11 | |
| 1,000 kg/day | DX (direct expansion) lowest | 11 | 135 | 1.23 | ₹3.60 Cr | ₹3.45 Cr | ₹7.04 Cr | 2.7 | 34 |
| Chilled water (chiller) | 9 | 203 | 1.19 | ₹4.87 Cr | ₹3.34 Cr | ₹8.20 Cr* | 3.6 | 26 | |
| Ammonia (NH₃) | 5 | 170 | 1.17 | ₹5.00 Cr | ₹3.28 Cr | ₹8.28 Cr* | 2.8 | 21 | |
| 2,000 kg/day | DX (direct expansion) Inside the band — not decisive | 22 | 329 | 1.93 | ₹8.35 Cr | ₹10.81 Cr | ₹19.17 Cr | 8.4 | 68 |
| Chilled water (chiller) | 18 | 406 | 1.85 | ₹10.78 Cr | ₹10.37 Cr | ₹21.14 Cr* | 11.3 | 50 | |
| Ammonia (NH₃) | 8 | 420 | 1.63 | ₹10.14 Cr | ₹9.11 Cr | ₹19.25 Cr* | 6.9 | 40 | |
| 5,000 kg/day | DX (direct expansion) | 55 | 733 | 1.78 | ₹19.92 Cr | ₹24.85 Cr | ₹44.77 Cr | 21.1 | 169 |
| Chilled water (chiller) | 45 | 763 | 1.70 | ₹25.37 Cr | ₹23.81 Cr | ₹49.17 Cr* | 28.3 | 123 | |
| Ammonia (NH₃) lowest | 19 | 780 | 1.41 | ₹22.25 Cr | ₹19.70 Cr | ₹41.96 Cr* | 16.5 | 98 |
* The study calls a winner only when the margin is 5% or more. Chilled-water and ammonia totals exclude a mechanised handling line and picking trolleys, which have no citable Indian price yet; DX bag rooms carry neither.
What the study says at each capacity
The study ranks each design on one number: capital cost plus ten years of electricity at ₹8 per kWh. It does not model labour, compost, maintenance, revenue, payback or IRR.
DX bag-rack rooms are the lowest capital-plus-electricity choice at 500 and 1,000 kg/day, by 16–20%.
At 2,000 kg/day DX and ammonia are 0.44% apart — inside the ±12% band. The study does not call a winner there; the tender does.
At 5,000 kg/day ammonia is lowest: ₹41.96 crore against DX's ₹44.77 crore over ten years, with the lowest electricity per kilogram (1.41 kWh), the fewest rooms (19 against 55), the least land (16.5 against 21.1 acres) and the smallest crew (98 against 169) — subject to two handling items the total excludes.
Chilled water wins the ten-year total at none of the four capacities, but it has the lowest electricity per kilogram at 500 kg/day (1.38 kWh) and the second-lowest at every other capacity, and the study records its own chilled-water result as unreconciled.
What MushroomWale supplies in an ammonia plant
Machine room
Screw or reciprocating ammonia compressors, evaporative condenser, plate heat exchangers to a glycol or chilled-water secondary loop, receiver, ammonia detection, emergency ventilation and a separated plant room to the statutory layout.
Shelf rooms
Dutch-style shelf rooms with secondary-coolant air units, mechanised filling and emptying, and picking on trolleys — the two items the study still has out to tender.
Statutory file
PESO pressure-vessel licence where the receiver exceeds 1,000 litres, operator training, and the safety basis drawn from IIAR 2 and EN 378 because IS 660 sets no detection or ventilation setpoints.
What this study does not tell you
- The study ranks each design on one number: capital cost plus ten years of electricity at ₹8 per kWh. It does not model labour, compost, maintenance, revenue, payback or IRR.
- At 1,000 kg/day the ammonia design has 4 production rooms (5 with the buffer room), filled 11.25 days apart, so 3 days in every 45-day cycle fall where every room is between flushes: no harvest those days. That is a dispatch-continuity issue caused by the room count, not by the refrigerant.
- An ammonia receiver above 1,000 litres needs a PESO pressure-vessel licence: that applies at 2,000 and 5,000 kg/day, not at 500 or 1,000.
Open gaps the study records
- G-1
- Compost respiration heat in the growing room has no primary source; 150 W per tonne is provisional (band 100–300).
- G-7
- Per-TR plant capex uses the firm's allowances; Indian chiller and ammonia quotations are still to be obtained.
- G-8
- Calibrated kW/TR (DX 1.10, chilled water 0.95, ammonia 0.85) sits 2–3% below the figures the firm previously published.
- G-10
- The often-quoted 39% ammonia-over-R404A COP advantage was not verified and is not used anywhere on this site.
- G-12
- DX rooms use a measured 1.35 kW per bay; shelf rooms use a computed fan load. Chilled water sits within 5% of DX on kWh/kg at 5,000 kg/day (1.70 vs 1.79) — a shelf-room air unit still has to be measured.
- G-15
- The yard allowance cannot hold the condenser footprints drawn for chilled water at 500–2,000 kg/day and ammonia at 500–1,000 kg/day; land and capex may move with vendor drawings.
Frequently asked questions
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Why Choose MushroomWale
Engineering Expertise
Agrimotion Engineering Private Limited is a registered EPC company (CIN U43900UP2023PTC185328, GSTIN 09AAZCA0158R1ZP) based in Firozabad, Uttar Pradesh.
Proven Track Record
Turnkey mushroom projects from 6-room starters to 30-room commercial facilities.
Bank-Recognized DPRs
Bank-format DPRs prepared to NABARD, NHB and MIDH norms for loan and subsidy applications.
Price an ammonia plant against DX and chilled water for your site
One quotation, three refrigeration options, the study's numbers behind each.