ROOFTOP UNIT TESTING
The project includes 9 new psychrometric chambers sized: 15-ton, 25-ton, 65-ton, and 150-ton. The operating range of the test chambers is -30F to 130F. Testing for regulatory compliance, performance, safety and reliability (AHRI, ASHRAE, UL, & CSA). Testing 60HZ and 50HZ units alike.
Redesigned a water to air coil calorimeter tunnel. The system measures mass flow with automatically actuated venture nozzles. Inlet and outlet enthalpy of air is determined by measuring dry bulb and wet bulb temperature upstream and downstream of the coil. An autotest feature was added along with safety mechanisms so many different tests could be run autonomously, leading to considerable lab savings.
A calorimeter that measures the effectiveness of copper and aluminum tubing with refrigerant inside and water counter-flown on the outside of the tube was redesigned. The original calorimeter cost over $1m in 1997. The complete redesign and rebuild cost less than $200K in 2015. System successfully can control superheat and subcooling entering and exiting the tube; tube can be operated in condensing mode or evaporating mode.