Quick Guide to Chilled Water Coil Replacement

In 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 explore the criteria that qualify an evaporator coil for replacement and provide insight into the design and construction aspects of the chilled water coil replacement process.

Criteria for Chilled Water Coil Replacement

Here are items to look for in your HVAC system that may indicate a chilled water coil is ready for 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 leaks, as these can compromise system performance and pose environmental concerns.
• Reduced Heat Transfer
  Measure the coil’s heat transfer efficiency, weighing 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.
• Reduced Energy Efficiency 
  Examine the coil’s energy efficiency, as newer models may offer improved performance and contribute to both energy and operational cost savings.

Coil Replacement Design and Execution

Once it has been decided that a chilled water coil will be replaced, be sure to follow these best practices next.

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, including elements 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, enhance durability and promote a longer lifespan of the replacement coil.

5. Installation Procedure

During the coil installation, make sure to follow 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, replacing a chilled water coil leads to a more efficient and reliable HVAC system, which contributes to greater energy efficiency and utility cost savings. Contact WTI Pure Air for more information as we can assist facility management teams with coil replacements in air handler units that cannot be cleaned or restored.