180° counterflow heat exchange delivers a smaller footprint than crossflow towers at the same capacity. Single central inlet minimises pipework and downtime. Outlet temperature tracks wet-bulb temperature — precision processes stay in control.
When expanding production or upgrading process lines, plants typically face one of three field constraints. If any of these sounds familiar, the LHN should be your first evaluation.
Rooftop equipment decks, building corners, legacy equipment zones, dense pipe corridors — the space available for a new cooling tower is effectively zero. The LHN's compact square structure fits greater cooling capacity into the same floor area.
Fine chemicals, electronics, and semiconductor processes are highly sensitive to cooling water temperature fluctuations. During peak summer heat, even a few degrees of outlet temperature rise can trigger equipment alarms and force production lines to derate. The LHN's counterflow design delivers more stable outlet temperatures within a constrained footprint.
Existing pipes, steelwork, cable trays, and equipment bases are already fixed. The LHN's single central inlet concentrates pipework at one point — even sites with severely restricted pipe space can complete installation without disrupting adjacent equipment.
The LHN uses 180° counterflow heat exchange: air enters from the bottom and rises vertically through the fill media, while water falls vertically from top nozzles — the two streams in full counter-directional contact. This geometry delivers higher thermal efficiency, and at equivalent flow rates the plan-view footprint is significantly smaller than a crossflow tower.
For the plant, the result is straightforward: no foundation enlargement, no equipment zone re-planning, and a cooling system upgrade completed within the existing space.
The thermal efficiency advantage of a counterflow tower comes from the physics of fully counter-directional air-water contact. Fixed nozzles distribute circulating water evenly across the fill surface, creating a sustained temperature-differential driving force with the rising air stream — keeping outlet temperature closely and consistently tracking the local wet-bulb temperature.
For the plant, this means: outlet temperature is far less prone to sharp fluctuations during peak summer heat, equipment alarms are reduced, product yield is more predictable, and the risk of unplanned shutdowns is significantly lower.
The LHN uses a single central inlet: the main pipe connects directly into the centre of the tower body, eliminating the need for symmetrical dual-sided branch piping. Compared to the multi-point inlet arrangements of crossflow towers, on-site pipework modification is substantially reduced.
The result: shorter construction schedules, lower installation costs, and better adaptability to existing pipe environments. Projects with severely restricted pipe space can proceed without affecting adjacent equipment operation.
16 models — match by flow rate or installation footprint
Standard design conditions: inlet 37 °C, outlet 32 °C, wet-bulb 27 °C, atmospheric pressure 99.4 kPa.
| Model | Flow (m³/h) | Footprint L×W (mm) | Height (mm) | Fan Dia. (mm) | Motor (kW) | Dry Weight (kg) | Inlet/Outlet (DN) |
|---|---|---|---|---|---|---|---|
| LHN-80 | 80 | 2,000×2,000 | 4,250 | 1,500 | 2.2 | 950 | 125 |
| LHN-100 | 100 | 2,250×2,250 | 4,250 | 1,800 | 4.0 | 1,050 | 125 |
| LHN-125 | 125 | 2,500×2,500 | 4,250 | 2,100 | 5.5 | 1,250 | 150 |
| LHN-150 | 150 | 2,750×2,750 | 4,450 | 2,100 | 5.5 | 1,420 | 150 |
| LHN-175 | 175 | 3,000×3,000 | 4,450 | 2,100 | 7.5 | 1,600 | 150 |
| LHN-200 | 200 | 3,250×3,250 | 4,450 | 2,400 | 7.5 | 1,750 | 200 |
| LHN-250 | 250 | 3,500×3,500 | 4,450 | 2,850 | 11.0 | 2,150 | 200 |
| LHN-300 | 300 | 3,750×3,750 | 4,900 | 3,200 | 15.0 | 2,620 | 250 |
| LHN-350 | 350 | 4,000×4,000 | 5,000 | 3,200 | 15.0 | 2,950 | 250 |
| LHN-400 | 400 | 4,500×4,500 | 5,000 | 3,200 | 15.0 | 3,520 | 250 |
| LHN-450 | 450 | 4,800×4,800 | 5,000 | 3,200 | 15.0 | 3,810 | 300 |
| LHN-500 | 500 | 5,000×5,000 | 5,250 | 3,700 | 15.0 | 4,150 | 300 |
| LHN-600 | 600 | 5,250×5,250 | 5,770 | 3,700 | 18.0 | 4,680 | 350 |
| LHN-700 | 700 | 5,500×5,500 | 5,770 | 4,050 | 18.5 | 5,460 | 350 |
| LHN-800 | 800 | 6,000×6,000 | 5,900 | 4,250 | 30.0 | 6,520 | 400 |
| LHN-1000 | 1,000 | 7,000×7,000 | 6,100 | 4,550 | 30.0 | 8,200 | 400 |
Not sure which model fits your project?
Submit your flow requirement and available installation area (L × W × clearance height). The COOLTEK engineering team will confirm the appropriate LHN model and respond within 48 hours.
Submit Project ParametersConfirm the following five site conditions before submitting your selection request — to avoid discovering installation constraints after the model has been chosen.
Is the available area ≥ the tower's plan dimensions (including at least 600 mm maintenance clearance on all sides)?
Does the indoor or rooftop clearance height accommodate the tower's total height (LHN-80: 4,250 mm; LHN-1000: 6,100 mm)?
Does the existing pump provide sufficient head to overcome the LHN's head loss (40–55 kPa)? Confirm pump specifications before selection.
Is there a strict noise limit at the plant boundary? At equivalent flow, the LHN generates approximately 1.8–3.1 dBA more than a crossflow tower. Noise-sensitive sites should evaluate the LHR series first.
Is the target outlet temperature defined? Standard design conditions are outlet 32°C (wet-bulb 27°C). Medium-to-high temperature applications (inlet 42°C) require separate confirmation.
Different problems call for different solutions — each COOLTEK series addresses a distinct core challenge
53–56 dBA at source. Meets QCVN 26:2025 night-time boundary limit of 45 dBA. Ideal for plants near residential areas.
Learn about LHR →Water turbine drives the fan — no motor, no electrical equipment. Suitable for hazardous areas or plants targeting zero cooling energy consumption.
Learn about LHRD →Process water circulates in sealed coils with zero air contact. Designed for processes with strict water purity requirements.
Learn about AWA →Bolt pattern matches existing foundations. Flange connections align precisely with existing pipework. Production restored in 24–48 hours.
Learn about LH →Rooftop load capacity and clearance height must be verified. As a reference, the LHN-500 has a dry weight of approximately 4.15 tonnes (operating weight includes water load) and a height of 5.25 m. The COOLTEK engineering team will review the structural parameters you provide before order confirmation.
Standard design conditions: inlet 37°C, outlet 32°C, wet-bulb 27°C. Approach temperature is approximately 3–5°C. Actual outlet temperature varies with local wet-bulb temperature. The counterflow design keeps outlet temperature fluctuations significantly lower than a crossflow tower of equivalent capacity.
The pump must provide sufficient head to overcome the LHN's head loss (40–55 kPa). Verify existing pump specifications before selection. If the existing pump head is insufficient, COOLTEK engineers can assist in evaluating whether replacement or addition of a pump is required.
Fixed nozzles should be inspected periodically for blockage (typically every 3–6 months depending on water quality), and fill media should be flushed regularly. Overall maintenance workload is comparable to a crossflow tower of equivalent capacity — no special maintenance requirements.
At equivalent flow, the LHN generates approximately 1.8–3.1 dBA more noise than a crossflow tower. If the plant boundary has strict noise limits (e.g. QCVN 26:2025 night-time 45 dBA), the LHR series — a crossflow square tower achieving 53–56 dBA at source — should be evaluated first.
Certain models support inlet temperatures up to 42°C with outlet at 32°C. Please contact COOLTEK engineers to confirm selection for non-standard thermal conditions. Standard models are rated for inlet 37°C, outlet 32°C, wet-bulb 27°C.
If your plant faces the combination of insufficient space, growing cooling demand, and strict temperature stability requirements, the LHN is the solution to evaluate first.
No foundation enlargement, no equipment zone re-planning — greater cooling capacity installed in the space already available.
Counterflow heat exchange keeps outlet temperature closely tracking wet-bulb temperature — peak-summer fluctuations are significantly lower than crossflow towers.
With increased cooling capacity in place, new equipment or expanded lines can be brought online under stable cooling water temperature conditions.
Single central inlet reduces pipework modification; shorter installation schedule. Stable outlet temperature reduces overheating alarms and lowers unplanned shutdown risk.
Selection Guide
Space-constrained: choose LHN. Noise-sensitive: choose LHR. A four-question decision framework to quickly identify the right series.
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Technical Principles
The concept of approach temperature, how wet-bulb temperature drives outlet temperature, and how to correctly estimate peak-summer outlet temperature.
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Installation Engineering
Real-world differences in pipework modification scope, construction schedule, and installation cost — and how to choose based on your site's pipe layout.
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Industry Applications
Sensitivity analysis of semiconductor and electronics processes to cooling water temperature, and how counterflow towers reduce fluctuations at the source.
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Industry Applications
Special considerations for cooling tower selection in GMP environments: water quality control, temperature stability, and maintenance compliance.
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Engineering Practice
A case study on completing a cooling system capacity expansion without altering the existing foundation structure.
Read more →Simply submit your flow requirement and site dimensions (L × W × clearance height). COOLTEK engineers will provide an LHN model recommendation and technical proposal based on your actual operating conditions.
