chilled water coil replacement

In the world of HVAC systems, the chilled water coil plays a crucial role in maintaining efficient and reliable operation. Over time, however, these coils may exhibit signs of wear and tear, necessitating replacement for optimal performance. In this article, we will explore the criteria that qualify an evaporator coil for replacement. Finally, we will provide a detailed insight into the design and construction aspects of the chilled water coil replacement process.

Criteria for Chilled Water Coil Replacement

  • Corrosion and Rust: Evaluate the coil for corrosion and rust, as these can significantly impair heat transfer efficiency.
  • Plumbing/Water Leaks: Identify any signs of refrigerant leaks, as these can compromise system performance and pose environmental concerns.
  • Reduced Heat Transfer: Measure the coil’s heat transfer efficiency, considering factors such as dirt accumulation and scaling that may hinder the process.
  • Age and Wear: Consider the age of the coil and assess the overall wear and tear, as older coils may no longer meet the system’s performance requirements.
  • Energy Efficiency: Examine the coil’s energy efficiency, as newer models may offer improved efficiency and contribute to energy savings.

Coil Replacement Process – Design and Construction Perspective

  1. System Assessment: Conduct a thorough assessment of the existing HVAC system, considering factors such as system capacity, plumbing, and compatibility with newer coil models.
  2. Design Compatibility: Ensure that the chilled water coil replacement is compatible with the existing system design, considering factors like size, shape, and material specifications.
  3. ASHRAE Guidelines: Adhere to ASHRAE guidelines for HVAC system design and construction, incorporating industry best practices for energy efficiency and environmental sustainability.
  4. Material Selection: Opt for high-quality materials that resist corrosion and enhance durability, promoting a longer lifespan for the replacement coil.
  5. Installation Procedure: Follow a meticulous installation procedure, considering proper brazing techniques, line charging, and pressure testing to guarantee the integrity of the new evaporator coil.
  6. Performance Testing: Conduct comprehensive performance testing post-installation to ensure the replacement coil meets or exceeds the system’s operational requirements.

By adhering to these best practices, chilled water coil replacement leads to a more efficient and reliable HVAC system. Which, ultimately, contributes to energy savings and environmental sustainability. For our part, WTI Pure Air assists facility management teams with coil replacements in air handler units that cannot be cleaned or restored. Contact us today for more information!


ASHRAE Handbook – HVAC Systems and Equipment

– ASHRAE Standard 169 – Climatic Data for Building Design Standards

HVAC&R Research Journal

– American Society of Mechanical Engineers (ASME) standards for HVAC components