50 Ton Air-Cooled Screw Chiller Selection Guide for Commercial HVAC Projects
A 50 ton air-cooled screw chiller is often used in commercial buildings, industrial facilities and process cooling projects that need reliable chilled water without a cooling tower. This guide explains how to check real capacity, water conditions, ambient temperature and supplier data before buying.
Choosing a 50 ton chiller is not as simple as matching a number on a quotation sheet. The real performance depends on chilled-water temperature, outdoor ambient temperature, water flow, refrigerant circuit design, compressor performance, installation conditions and controls.
For commercial HVAC, a 50 ton air-cooled screw chiller may serve AHUs, fan coil units or medium-size chilled-water systems. For industrial process cooling, the buyer must also confirm temperature stability, fluid type, operating hours and backup requirements.
Direct Answer
A 50 ton air-cooled screw chiller provides about 176 kW of cooling capacity under standard conversion, but the actual usable capacity depends on chilled-water temperature, outdoor ambient temperature, water flow, installation airflow and manufacturer rating conditions.
Buyers should not purchase a 50 ton chiller only by nominal capacity. They should confirm the real performance at the project location and operating conditions. For a broader product range, see SongXin’s air-cooled screw chiller line.
What Does 50 Ton Mean?
In HVAC, one refrigeration ton (RT or TR) equals approximately 3.51685 kW of cooling capacity; therefore 50 RT is approximately 175.84 kW. This is a unit conversion, not a guarantee that a particular chiller delivers that output at the project’s outdoor ambient and chilled-water temperatures. Confirm the exact operating point and actual model availability before purchasing.
50 Ton Chiller Water Flow: Worked Calculation for a Buyer
Illustrative calculation, not a SongXin product rating: use a required cooling duty of 50 RT (175.84 kW), 12°C entering and 7°C leaving chilled water (5 K difference), and plain water. The approximate design flow follows from the energy balance:
| Calculation | Illustrative result |
|---|---|
| 50 RT × 3.51685 kW/RT | 175.84 kW cooling duty |
| Water flow ≈ duty (kW) ÷ [1.163 × ΔT (K)] | 175.84 ÷ (1.163 × 5) ≈ 30.2 m³/h |
| Fluid and flow assumptions | Preliminary pure-water calculation at typical chilled-water temperatures; confirm density, specific heat, glycol concentration and actual pump conditions |
| Critical procurement confirmation | Evaporator minimum/maximum flow, differential pressure and rated cooling output at the project ambient |
For a glycol mixture or other process fluid, recalculate with the specified fluid’s density and specific heat. This flow estimate does not prove the capacity of a particular 50 RT chiller model. For elevated ambient temperatures, see the air-cooled screw chiller capacity correction guide and request the manufacturer’s corrected performance curve.
When Is a 50 Ton Air-Cooled Screw Chiller Used?
Commercial HVAC
Offices, small hotels, retail buildings, showrooms, schools, clinics and public buildings.
Industrial Process Cooling
Process water cooling, equipment cooling, workshop air conditioning or production support.
Technical Spaces
Electrical rooms, laboratories, control rooms or other technical zones with air-side cooling equipment.
Retrofit Projects
Air-cooled chillers can simplify replacement because they do not require a cooling tower.
Commercial HVAC vs Process Cooling Use
| Item | Commercial HVAC | Industrial Process Cooling |
|---|---|---|
| Typical purpose | Comfort cooling for buildings | Cooling machines, production lines or process water |
| Load profile | Changes by occupancy and schedule | May be continuous or production-based |
| Water temperature | Often standard chilled-water range | May require custom water temperature |
| Control focus | Comfort, energy saving and BMS | Temperature stability and equipment protection |
| Risk if undersized | Poor comfort | Production interruption or equipment alarm |
| Data required | Building load, AHU/FCU data, schedule | Process heat load, flow, temperature range, fluid type |
Why Choose an Air-Cooled Screw Chiller?
- No cooling tower, condenser water pump or tower water treatment
- Outdoor installation on roof, ground platform or equipment yard
- Screw compressor design for medium and larger cooling loads
- Practical for water-limited projects or retrofit replacement
- Works with AHUs, fan coil units and selected process cooling systems
- Simpler plant layout than water-cooled systems in many projects
50 Ton Chiller Selection Checklist
| Selection Item | Example Question |
|---|---|
| Cooling capacity | Is 50 ton based on load calculation or estimate? |
| Leaving water temperature | Do you need 7 deg C, 10 deg C, 12 deg C or another value? |
| Water flow rate | Is the pump flow confirmed? |
| Outdoor ambient temperature | What is the design temperature in summer? |
| Power supply | What voltage, phase and frequency are available? |
| Application | Comfort cooling or process cooling? |
| Installation location | Roof, ground, platform or equipment yard? |
| Airflow clearance | Is there enough space around the condenser? |
| Noise limit | Are there nearby offices, hotels or residential areas? |
| Controls | Is BMS or remote monitoring required? |
Rated Tons Are Only the Starting Point
A 50 ton air-cooled screw chiller selected for a mild climate may not deliver the same performance in a very hot region unless the condenser and compressor are configured for that condition.
For a deeper method, read SongXin’s guide on how to select an air-cooled chiller for commercial HVAC projects.
Technical Datasheet Items to Request
- Rated cooling capacity and rating condition
- Capacity at your outdoor design temperature
- Input power and efficiency data
- Compressor type and quantity
- Refrigerant
- Evaporator type
- Water pressure drop and recommended water flow
- Operating ambient temperature range
- Sound level, dimensions and operating weight
- Electrical data and starting method
- Control interface and protection functions
- Shipping dimensions and documentation
Chilled-Water Temperature and Outdoor Ambient Matter
Water-Side Conditions
- Leaving chilled-water temperature
- Entering chilled-water temperature
- Required water flow
- Water-side pressure drop
- Glycol use for freezing protection or process reasons
Outdoor Conditions
- Maximum summer design temperature
- Condenser coil design
- Fan capacity
- High-pressure protection
- Installation airflow clearance
Installation Space and Airflow
Poor installation can reduce chiller performance. An air-cooled chiller needs enough open space for condenser air intake and hot air discharge. The supplier should provide installation clearance recommendations before ordering.
- Avoid installing units too close to walls
- Do not block condenser airflow
- Avoid heat recirculation zones
- Keep enough service access
- Separate multiple units correctly
- Prevent hot discharge air from returning to the condenser
Air-Cooled Screw Chiller vs Scroll Chiller at 50 Ton
| Item | Air-Cooled Screw Chiller | Air-Cooled Scroll Chiller |
|---|---|---|
| Compressor type | Screw compressor | Multiple scroll compressors |
| Typical use | Medium-load commercial and industrial systems | Small to medium commercial systems |
| Part-load design | Depends on compressor and control design | Often staged by multiple compressors |
| Maintenance | Requires screw compressor service knowledge | Modular compressor replacement may be easier |
| Best choice depends on | Load profile, project standard, budget and service plan | Load profile, budget and maintenance preference |
What Affects 50 Ton Chiller Price?
- Compressor brand and configuration
- Refrigerant
- Heat exchanger design
- Control system
- Ambient temperature design
- Noise treatment
- Electrical components
- Protection functions
- Anti-corrosion options
- Factory testing requirements
- Shipping destination
- Custom documentation needs
FOB/CIF Scope and Engineering Submittals for a 50 Ton Chiller RFQ
Price comparisons only work when both suppliers quote the same design point and delivery scope. Request a model-identified offer instead of judging quotations by advertised tonnage alone.
| RFQ line item | Specify before comparing prices |
|---|---|
| Cooling and efficiency | Corrected cooling kW, unit electrical input and COP/EER at project outdoor dry-bulb and chilled-water conditions; agreed system boundary |
| Factory acceptance | Proposed test scope, actual tests available for the ordered model and which reports will be provided; do not assume full-load witness testing is standard |
| Quotation boundary | Equipment only versus pumps, valves, controls, commissioning, spare parts, refrigerant charge, packing and export handling |
| Incoterms and destination | Named FOB loading port or named CIF destination port as applicable, Incoterms edition, shipping/insurance inclusions, unloading and local taxes excluded or included |
| Installation support | Outline/connection drawing, access and air-recirculation requirements, commissioning responsibility, warranty start point and spare-part availability |
Practical buying rule: a lower EXW/FOB equipment price is not necessarily a lower installed project cost. Confirm country electrical standards, warranty servicing arrangements and the named delivery point before making the final comparison.
How to Compare 50 Ton Chiller Quotations
| Quotation Item | Supplier A | Supplier B | Supplier C |
|---|---|---|---|
| Rated capacity condition | |||
| Actual capacity at project ambient | |||
| Leaving water temperature | |||
| Compressor type | |||
| Refrigerant | |||
| Noise level | |||
| BMS option | |||
| Factory testing | |||
| Warranty and support |
Questions to Ask Your Chiller Supplier
- What rating condition is the 50 ton capacity based on?
- What is the capacity at my outdoor design temperature?
- What is the recommended water flow?
- What is the leaving chilled-water temperature range?
- What compressor type is used?
- What protection functions are included?
- What is the noise level?
- What installation clearance is required?
- Can the unit connect to BMS?
- What factory testing is available?
Common Mistakes When Buying a 50 Ton Chiller
- Buying only by nominal tonnage
- Ignoring local ambient temperature
- Not checking water-side conditions
- Underestimating startup current
- Missing glycol requirements
- Forgetting noise limits
- Poor condenser airflow planning
- Not confirming spare parts and service support
- Comparing price without matching specifications
- Not preparing load calculation data
When to Contact a Supplier
You can contact SongXin once you already know several core project conditions. Even if the final load calculation is not complete, early supplier feedback can help confirm whether a 50 ton air-cooled screw chiller is the right capacity range or whether a smaller or larger model should be reviewed.
- Project location
- Application type
- Required capacity or estimated load
- Chilled-water temperature
- Outdoor design temperature
- Power supply
- Installation location
- Required delivery time
Frequently Asked Questions
How many kW is a 50 ton chiller?
A 50 ton chiller is approximately 176 kW under standard conversion. Final rated capacity depends on the manufacturer and operating conditions.
Is a 50 ton air-cooled screw chiller suitable for commercial buildings?
Yes, it can be suitable for medium-size commercial buildings, support buildings and retrofit projects. A load calculation should confirm whether 50 ton is enough.
Does an air-cooled screw chiller need a cooling tower?
No. An air-cooled screw chiller rejects heat directly to outdoor air and does not require a cooling tower.
Can a 50 ton chiller be used for process cooling?
Yes, but process cooling requires careful confirmation of water temperature, flow rate, operating hours and temperature stability.
What should I check before buying?
Check cooling capacity at real conditions, water temperature, ambient temperature, power supply, installation clearance, controls, noise and supplier support.
Should I choose screw or scroll compressor at 50 ton?
Both can be considered depending on project requirements. Compare load profile, service preference, efficiency, budget and supplier support.
Can SongXin Supply a 50 RT Screw Chiller? Verify the Model
Do not infer current product availability from a broad family-capacity range. Around 50 RT, buyers should also compare suitable air-cooled scroll and screw chillers: compressor technology depends on the available model, design point, part-load performance, service network and commercial requirements. Ask SongXin to identify a current equipment model and provide a matching datasheet; no model-specific 50 RT screw chiller is independently verified in this guide.
| Documentation requested | What a complete technical submittal should show |
|---|---|
| Exact model and compressor arrangement | Manufacturer model number, compressor type and number of circuits; no assumption that 50 RT implies a screw compressor |
| Real design-point duty | Cooling kW at actual ambient, leaving and entering fluid conditions, fouling and altitude basis where relevant |
| Power / operating limit | Total electrical input, full-load / part-load efficiency, supply voltage and continuous operation envelope |
| Water circuit | Fluid type, evaporator flow range, available pressure drop and freeze / minimum-flow safeguards |
| Procurement evidence | Outline drawing, actual mass, installation clearance, sound data, selected model’s testing and applicable compliance declarations |
Browse the air-cooled screw chiller product information, then request an engineering selection and a comparable quotation for your project.
About SongXin
SongXin HVAC presents commercial and industrial chiller, DX, heat-pump and air handling equipment. For a 50 RT enquiry, request the actual proposed model and verified performance at the project conditions, delivery scope, factory-test documents where available, warranty terms and shipping details. Contact: info@sxinhvac.com · +86 153-1889-6990.
Get Help Selecting a 50 Ton Air-Cooled Screw Chiller
For commercial HVAC or industrial process cooling, ask SongXin to verify whether a suitable air-cooled chiller model can meet your nominal 50 RT requirement at the specified outdoor and water-side conditions. Screw versus scroll configuration, capacity availability and technical compliance must be established from the supplier’s current model documents before ordering.
Contact SongXin for 50 Ton Chiller Selection →