Project Context: Cooling Upgrade Without Major Reconstruction

This project involved an operating data center facility. The client needed to improve local cooling performance without rebuilding the room, moving major equipment, or interrupting normal operation.

The facility was planned for an earlier IT load profile. As rack heat load increased, several rack inlet temperatures moved closer to the allowed operating range. The main customer pain point was clear: the room needed more effective cooling, but the available space and installation window were limited.

The site layout created hard constraints. Rack positions, service aisles, cable routes, cooling unit locations, floor openings, and maintenance paths had to remain largely unchanged. This made a full system replacement less practical than a targeted cooling upgrade.

HiThermal supported the project through remote thermal assessment, airflow-path review, practical retrofit planning, component specification definition, and China-side delivery coordination.

Customer Pain Points

The client faced a local overheating risk rather than a simple equipment purchasing problem. Some racks needed more effective cold-air delivery, but the existing room layout could not be changed freely. This made the upgrade more dependent on airflow-path control and component fit.

The main pain points included:

• selected racks operated close to their inlet temperature limit;
• cold air did not reach some high-load racks effectively;
• hot air returned to rack inlets near rack ends and open cabinet spaces;
• cold air leaked through cable openings, floor gaps, and unused rack areas;
• upper and lower rack positions showed uneven inlet temperature;
• the client could not accept long shutdown time or large construction work;
• the required components had to match existing rack, aisle, floor, and maintenance conditions.

These issues made the project different from a new-build cooling design. The upgrade had to work within the existing room and improve the cooling path step by step.

Remote Thermal Assessment and Airflow-Path Review

The first step was to understand how cold air and hot air moved through the room. New cooling equipment was not selected at the beginning. The team first reviewed the existing rack layout, cooling unit position, perforated floor tile location, cable openings, blanking panel condition, aisle geometry, and rack inlet temperature readings.

This review helped identify where cooling capacity was being lost. Cold air leakage, bypass airflow, hot-air recirculation, and poor rack-level distribution can all create local temperature rise. The engineering task was to correct these path problems before adding unnecessary equipment.

The review focused on several practical questions:

• Which racks had higher inlet-temperature risk?
• Where did cold air fail to reach the rack inlet?
• Where did hot air return to the cold side?
• Which cable openings, floor gaps, or rack spaces caused leakage?
• Which changes could be implemented without affecting normal operation?

This assessment separated airflow-management issues from component-upgrade issues. That helped keep the retrofit focused, lower-disruption, and easier to execute.

Low-Disruption Cooling Improvement Actions

The first retrofit path focused on using the existing space more effectively. In an operating data center, cooling work must reduce thermal risk without creating unnecessary shutdown pressure or large construction load.

The recommended actions focused on leakage control, airflow guidance, and hot-air recirculation reduction:

• seal cable openings and floor gaps with suitable fire-rated materials;
• install blanking panels in unused rack spaces;
• adjust perforated floor tile location and open area according to rack load;
• add local airflow guide plates near rack ends and aisle edges;
• improve sealing around selected cold aisle containment areas;
• review auxiliary fan modules where local airflow support was required.

These actions were designed for staged installation. Most work could be handled area by area by the site team while the facility remained in operation.

The engineering goal was direct: reduce bypass airflow, limit hot-air recirculation, and direct available cooling capacity toward racks with higher inlet-temperature risk.

Cooling Issues and Practical Upgrade Actions

The upgrade plan treated cooling as a path-control problem. Cooling capacity becomes useful only when supply air reaches the rack inlet and returns to the cooling equipment without uncontrolled mixing. Small layout details can change the real cooling result inside an operating room.

Targeted Cooling Component Selection

Component selection was based on site constraints rather than catalogue data alone. Each component had to match available space, airflow direction, installation method, fire-rating requirement, maintenance access, operating environment, and delivery schedule.

The project used targeted cooling components instead of full room reconstruction. This reduced implementation complexity and kept the upgrade aligned with the existing facility layout.

Typical component categories included:

• high-static-pressure axial fans or auxiliary airflow modules for local airflow support;
• custom sheet-metal baffles and guide plates for recirculation control;
• sealing materials and blanking accessories for leakage reduction;
• rack accessories and airflow-control parts for cabinet-level correction;
• thermal pads, heat spreaders, or equipment-level heat sinks for local device cooling;
• optional rack-level cooling modules for future higher-density deployment.

Before procurement, each specification was checked against installation dimensions, airflow requirement, noise limit, bearing type, material thickness, surface treatment, fire rating, dimensional tolerance, certification documentation, packaging, and delivery timing.

China-Side Procurement and Delivery Coordination

Cooling retrofit projects often involve many small but important components. A single project may require fans, sheet-metal parts, sealing materials, thermal interface materials, rack accessories, and custom mounting parts.

HiThermal coordinated the China-side sourcing and delivery work. The team translated engineering requirements into component specifications, organized sourcing, reviewed samples where required, checked key quality requirements, and prepared delivery coordination.

This kept procurement connected to the site constraints identified during the assessment. The client did not need to manage multiple factories, quotations, samples, and delivery schedules separately for each small component category.

Delivered Scope

The delivered work covered assessment support, retrofit recommendations, component specification definition, and delivery coordination.

Assessment deliverables

• thermal issue assessment;
• airflow-path problem identification;
• cold-air shortage review;
• hot-air recirculation review;
• rack inlet temperature review;
• upgrade priority suggestions.

Engineering deliverables

• airflow-path improvement plan;
• sealing and blanking recommendations;
• tile and aisle adjustment guidance;
• local airflow guide component suggestions;
• component-level cooling upgrade suggestions;
• installation notes.

Component delivery support

• component specification definition;
• sample verification where required;
• batch procurement coordination;
• quality and document checks;
• cross-border delivery coordination.

The client received a staged cooling upgrade path based on the existing room layout. The work focused on airflow correction, targeted component deployment, and practical installation planning rather than unnecessary system-level reconstruction.

Confidentiality Note

This case is based on a real project. Client identity, site parameters, procurement channels, supplier information, and commercial details have been removed or generalized.