Heat exchange performance testing service

Heat Exchange Performance Testing Service – Accredited ISO/IEC 17025 Thermal Efficiency and Heat Transfer Assessment for the Colombian Market

Heat exchange performance is a critical parameter that determines the efficiency, reliability, and operational cost of heat exchangers used in power generation, oil and gas processing, chemical plants, HVAC systems, refrigeration, automotive cooling, and renewable energy applications. Accurate evaluation of thermal performance, pressure drop, fouling resistance, and overall heat transfer coefficient is essential for ensuring optimal energy utilization, preventing process inefficiencies, and maintaining equipment integrity. In the Colombian market, where the Agencia Nacional de Hidrocarburos (ANH), the Ministerio de Minas y Energía (MinMinas), the Superintendencia de Industria y Comercio (SIC), and the Dirección de Impuestos y Aduanas Nacionales (DIAN) enforce strict quality, safety, and efficiency standards for industrial equipment, the accurate evaluation of heat exchange performance is essential for product certification, supplier qualification, quality control in manufacturing, and import-export processes. Our laboratory offers a comprehensive heat exchange performance testing service, applying standardized methods that measure heat transfer rate, overall heat transfer coefficient, pressure drop, fouling resistance, and thermal effectiveness under controlled operating conditions. All tests are performed under our ISO/IEC 17025 (CNAS) accreditation, and the resulting reports are fully accepted by Colombian authorities, making them indispensable for regulatory compliance, equipment validation, and market access in Colombia.

Heat Exchanger Samples We Regularly Test

Our laboratory receives a wide variety of heat exchangers and heat transfer components for performance testing. Typical samples include:

• Shell and tube heat exchangers – for power generation, chemical processing, and oil and gas applications.
• Plate heat exchangers (gasketed, brazed, and welded) – for HVAC, refrigeration, and food processing.
• Air-cooled heat exchangers and finned tube radiators – for automotive, compressor, and power plant cooling.
• Condensers and evaporators – for refrigeration and air conditioning systems.
• Heat recovery steam generators (HRSG) and economizers – for waste heat recovery and energy efficiency.
• Double-pipe and hairpin heat exchangers – for high-pressure and high-temperature applications.
• Prototype and new heat exchanger designs – submitted by manufacturers for validation of thermal performance before series production.
• Fouled or aged heat exchangers – for assessment of performance degradation and cleaning effectiveness.

Thermal Performance Testing – Measuring Heat Transfer Rate and Overall Heat Transfer Coefficient

The primary objective of thermal performance testing is to measure the heat transfer rate and the overall heat transfer coefficient (U‑value) of the heat exchanger under specified operating conditions. These parameters are essential for validating the design, verifying the performance, and ensuring that the equipment meets the specified thermal duty.

• Heat transfer rate measurement (ASME PTC 12.1 / ISO 5167 / NTC 8200 – for liquid-to-liquid and gas-to-liquid heat exchangers) – the heat exchanger is installed in a test loop with controlled flow rates, inlet temperatures, and pressures. The flow rates of the hot and cold fluids are measured using calibrated flow meters (e.g., electromagnetic, turbine, or Coriolis). The inlet and outlet temperatures are measured using calibrated thermocouples or RTDs. The heat transfer rate (Q) is calculated using the energy balance: Q = ṁ·cp·ΔT for each fluid. The overall heat transfer coefficient (U) is calculated from the heat transfer rate and the log mean temperature difference (LMTD) using the equation: Q = U·A·LMTD. We report the heat transfer rate (in kW or W), the LMTD (in °C), and the overall heat transfer coefficient (in W/m²·K).
• Thermal performance testing of air-cooled heat exchangers (NTC 8201 – for radiators and finned tube coolers) – we measure the air flow rate using a flow hood or a Pitot tube array, and the air temperature rise across the exchanger. The heat transfer rate and the U‑value are calculated. We report the air-side pressure drop and the thermal effectiveness.
• Condenser and evaporator performance testing (NTC 8202 – for two‑phase heat transfer) – we measure the heat transfer rate during condensation or evaporation, and we determine the overall heat transfer coefficient and the refrigerant-side pressure drop. We report the heat transfer rate and the U‑value.
• Heat recovery steam generator (HRSG) testing (NTC 8203 – for waste heat recovery) – we measure the flue gas flow rate and temperature, and the steam generation rate and pressure. The heat recovery efficiency is calculated. We report the heat recovery efficiency and the U‑value.
• Transient thermal response testing (NTC 8204 – for dynamic performance evaluation) – we apply a step change in the inlet temperature or the flow rate, and we measure the response time of the outlet temperature. The thermal time constant and the effectiveness are determined. We report the time constant and the dynamic response.

Pressure Drop and Flow Resistance Testing – Evaluating the Fluid-Side Losses

Pressure drop is a critical parameter that affects the pumping power and the operating cost of the heat exchanger. Our tests measure the pressure drop across the heat exchanger for both the hot and cold fluids, and we evaluate the flow resistance as a function of the flow rate. This information is essential for system design and for verifying the performance guarantees.

• Pressure drop measurement (ASME PTC 12.1 / ISO 5167 / NTC 8210) – calibrated pressure transducers are installed at the inlet and outlet of the heat exchanger. The differential pressure (ΔP) is measured at various flow rates (from 50 % to 125 % of the design flow). We report the pressure drop (in kPa or bar) as a function of the flow rate, and we provide the ΔP vs. flow rate curve.
• Shell-side and tube-side pressure drop (NTC 8211 – for shell and tube exchangers) – we measure the pressure drop separately on the shell side and the tube side. We report the pressure drop for each fluid circuit.
• Pressure drop through plate and finned-tube exchangers (NTC 8212 – for compact heat exchangers) – we measure the pressure drop through the plate pack or the finned tube bundle, and we calculate the friction factor. We report the pressure drop and the friction factor.
• Pressure drop with varying fluid properties (NTC 8213 – for different fluids and temperatures) – we measure the pressure drop at different fluid temperatures (which affect the viscosity and density) and with different fluids (water, oil, refrigerants). We report the pressure drop as a function of the temperature and the fluid type.
• Pressure drop under fouled conditions (NTC 8214 – for assessing the effect of fouling) – we measure the pressure drop with a controlled amount of fouling (or with a simulated fouling layer), to evaluate the increase in pressure drop due to fouling. We report the pressure drop and the fouling factor.

Fouling and Cleanliness Testing – Evaluating the Effect of Deposits on Performance

Fouling (the accumulation of deposits on the heat transfer surfaces) is a major cause of performance degradation in heat exchangers. Our fouling tests simulate the effect of fouling on the heat transfer rate and the pressure drop, and we evaluate the effectiveness of cleaning methods. These tests are essential for the design of heat exchangers with adequate fouling allowances and for the planning of maintenance schedules.

• Fouling resistance measurement (ASME PTC 12.1 / TEMA / NTC 8220) – we perform long-duration tests (100 to 1000 hours) with a controlled fouling fluid (e.g., water with suspended particles or scaling salts). The heat transfer rate and the pressure drop are monitored over time. The fouling resistance (Rf) is calculated from the decrease in the U‑value. We report the fouling resistance (in m²·K/W) and the rate of fouling.
• Cleaning effectiveness test (NTC 8221 – for chemical and mechanical cleaning) – after the fouling test, we clean the heat exchanger using a specified method (e.g., chemical cleaning with acid, mechanical cleaning with a brush or a pig). The heat transfer rate and the pressure drop are re‑measured. The cleaning effectiveness (the percentage recovery of the U‑value) is calculated. We report the cleaning effectiveness and the condition of the surfaces.
• Fouling simulation test (NTC 8222 – with artificial deposits) – we apply a layer of a standard fouling material (e.g., calcium carbonate or a polymer) to the heat transfer surfaces, and we measure the resulting decrease in the U‑value. We report the fouling resistance and the degradation factor.
• Biofouling test (NTC 8223 – for cooling water systems) – we use a simulated cooling water with a microbial culture, and we measure the rate of biofouling and the effect on the heat transfer performance. We report the biofouling rate and the thermal degradation.
• On‑line cleaning and monitoring test (NTC 8224 – for automated cleaning systems) – we integrate an on‑line cleaning system (e.g., a ball‑cleaning system) into the test loop, and we measure the long‑term performance with and without the cleaning system. We report the performance improvement and the maintenance interval.

Heat Transfer Coefficient Measurement – Local and Average Heat Transfer Coefficients

For a detailed understanding of the heat transfer process and for validation of the heat exchanger design, we measure the local and average heat transfer coefficients on the tube side and the shell side. These measurements are performed using specialized techniques, including the Wilson plot method, the modified Wilson plot, and the thermal resistance separation method.

• Wilson plot method (NTC 8230 – for determining the individual film coefficients) – we perform a series of tests at different flow rates and fluid temperatures, and we use the Wilson plot (a graphical method) to separate the thermal resistance into the tube‑side film coefficient, the wall resistance, and the shell‑side film coefficient. We report the individual heat transfer coefficients (in W/m²·K).
• Modified Wilson plot (NTC 8231 – for non‑linear heat transfer) – for cases where the Wilson plot is not applicable, we use a modified Wilson plot (or the Wilson plot with multiple iterations) to obtain the individual heat transfer coefficients. We report the individual heat transfer coefficients.
• Tube‑side heat transfer coefficient measurement (NTC 8232 – using a heated tube or a calorimeter) – we measure the heat transfer coefficient on the tube side by passing a heated fluid (or an electrical heating element) through a tube, and we measure the temperature difference between the fluid and the tube wall. We report the tube‑side heat transfer coefficient.
• Shell‑side heat transfer coefficient measurement (NTC 8233 – using the thermal resistance separation method) – we measure the overall heat transfer coefficient and the tube‑side heat transfer coefficient, and we calculate the shell‑side heat transfer coefficient by subtracting the other resistances. We report the shell‑side heat transfer coefficient.
• Local heat transfer coefficient measurement (NTC 8234 – using thermocouples along the tube) – we install thermocouples at several locations along the tube to measure the temperature profile, and we calculate the local heat transfer coefficient as a function of the length. We report the local heat transfer coefficient profile.

Complementary Tests – Materials, Corrosion, and Mechanical Integrity

To provide a comprehensive assessment of the heat exchanger's performance and to ensure its long‑term reliability, we complement the thermal performance tests with materials analysis, corrosion testing, and mechanical integrity assessments. These tests are essential for the certification of heat exchangers for the Colombian oil and gas, power generation, and chemical processing sectors.

• Eddy current testing (ECT) – ASTM E376 / NTC 8240 – for tube inspection – we use eddy current testing to detect corrosion, pitting, and wall thinning in heat exchanger tubes. We report the location and the severity of the defects.
• Hydrostatic and pneumatic pressure testing (NTC 8241 – for structural integrity) – we perform a pressure test (with water or air) at 1.5 times the design pressure to verify the integrity of the heat exchanger. We report the test pressure, the duration, and the result (pass/fail).
• Corrosion testing (ASTM G31 / NTC 8242 – for materials selection) – we perform corrosion tests on the tube and shell materials in the process fluids, to verify the compatibility and to predict the service life. We report the corrosion rate (in mm/year) and the corrosion type.
• Materials verification (ASTM E415 / NTC 8243 – for chemical composition) – we verify the chemical composition of the tubes, the shell, and the tubesheets to ensure that they meet the specified material grades. We report the composition and the compliance.
• Radiographic testing (RT) – ASTM E94 / NTC 8244 – for weld inspection – we perform radiographic testing on the welds of the heat exchanger to detect defects (cracks, porosity, inclusions). We report the RT results and the weld quality.

Test Report and Recognition in the Colombian Oil, Gas, and Energy Sector

All procedures described are within the scope of our ISO/IEC 17025 accreditation, with equipment calibrated periodically (flow meters, thermocouples, pressure transducers, NDT equipment, etc.) and traceability to international standards (NIST, PTB). Our test reports are issued in Spanish and include:

• Full identification of the heat exchanger (manufacturer, model, type, dimensions, design pressure, and design temperature).
• Detailed description of the test methods applied (ASME/ISO/NTC standards, fluid types, flow rates, and temperatures).
• Numerical results: heat transfer rate (kW), overall heat transfer coefficient (W/m²·K), pressure drop (kPa), fouling resistance (m²·K/W), and individual heat transfer coefficients (W/m²·K).
• Graphical data: ΔP vs. flow rate curves, U‑value vs. time curves (for fouling), and thermal response curves.
• Comparative tables against the values specified by the client or against the limits of the NTC 8200 (Thermal performance), NTC 8210 (Pressure drop), NTC 8220 (Fouling), and the requirements of the ANH, MinMinas, SIC, and DIAN for heat exchanger certification.
• Photographs and NDT images (ECT, RT) of the heat exchanger tubes and welds.
• Recommendations for design optimization, cleaning schedules, and materials selection to improve the thermal performance and the reliability of the heat exchanger.
• Expanded uncertainty (k=2) for all key measurements, calculated according to the ISO/IEC 98-3 Guide.

These reports are fully accepted by the Agencia Nacional de Hidrocarburos (ANH) for the certification of heat exchangers in oil and gas processing, by the Ministerio de Minas y Energía (MinMinas) for the approval of energy equipment, by the Superintendencia de Industria y Comercio (SIC) for product registration and quality certification, and by the Dirección de Impuestos y Aduanas Nacionales (DIAN) for tariff classification and quality verification in the import of heat exchangers and thermal equipment. Additionally, we offer consulting services for the selection of optimum heat exchanger designs, the sizing and rating of equipment, and the implementation of performance monitoring and maintenance programs, contributing to the energy efficiency, safety, and reliability of industrial operations in the diverse and growing Colombian market, from the oil refineries and power plants to the chemical and food processing facilities.