An energy efficient design is the last thing on a property owners’ mind during the construction of a chilled water plant. Typically, the chief concern revolves around keeping construction costs to a minimum, ignoring future utility costs and energy efficiency considerations that are critical once a building is fully functioning. Due to this altered focus, chiller systems have historically been built using the classically inefficient “primary/secondary” (P/S). This configuration simply makes sure the building doesn’t run out of cooling on the hottest day of the year and gives no consideration to the expense of this strategy.
With respect to energy, one of the greatest causes for concern with these P/S systems is what is known as blending. Blending occurs as the chilled water combines with warmer water, thereby decreasing the temperature of the return water into the chiller. Because the chillers outputs are spec’d based on a designated temperature set point, energy is being wasted as the system fights to maintain its set point with the influx of warmer water.
To combat this issue, tekWorx has developed an “Integrated Primary/Secondary” retrofit design (IPS®) that brings valuable primary energy benefits to existing primary/secondary systems. Depending upon the specifications of a system, the IPS® substantially improves flow and reduces blending. The IPS® requires minor mechanical/piping changes and control system modifications, keeping the overarching facility infrastructure intact with minimal interruption to the current cooling operations. To see how tekWorx IPS™ can improve your ∆ T, fill out our Chiller Plant Evaluation Form.