Hydronic heat transferWaterside economizers and free coolingChilled-water plant design
Specifying and designing gasketed plate heat exchangers
Approach temperature, pressure drop and wall shear stress in HVAC service
About this presentation
A technical seminar for consulting engineers on how gasketed plate-and-frame heat exchangers are built and how the numbers in a specification drive their size, cost and service life. It covers the energy balance, log mean temperature difference and thermal duty, Reynolds number and the Darcy-Weisbach pressure drop, maldistribution, why added fouling factors work against plate exchangers, wall shear stress and part-load operation, port filters and backflush valves for open loops, and certification of liquid-to-liquid heat exchangers to AHRI Standard 400.
Learning objectives
- Describe the parts of a gasketed plate heat exchanger and how the fluids flow.
- Explain how approach temperature and LMTD drive exchanger size and cost.
- Relate allowable pressure drop to velocity, turbulence and heat transfer.
- Explain why fouling factors backfire and how wall shear controls fouling.
- Specify AHRI 400 certification and state the scope of the program.