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Research Completed on Residential IAQ, Hydraulic Shock

Research Completed on Residential IAQ, Hydraulic Shock

From eSociety, June 2019


An ASHRAE research project has developed a publication titled Residential IAQ Guide: Best Practices for Acquisition, Design, Construction, Maintenance and Operation, which is now available in the ASHRAE bookstore.

The guide fills a need for a comprehensive ASHRAE document that provides information and tools to homeowners, designers, construction and maintenance tradespeople and builders to integrate IAQ into dwellings while addressing budget constraints and other functional requirements. This guide is intended to help move beyond current practices to provide good IAQ in dwellings and enhance and integrate good IAQ using proven strategies without significant expense.

The ASHRAE Environmental Health Committee sponsored 1663-RP, Residential IAQ Guide. Larry Schoen with Schoen Engineering Inc. was the principal investigator.


Water hammer or hydraulic shock is an issue that has caused pressure surges, noise, and even pipe ruptures in industrial ammonia refrigeration systems.

An ASHRAE research project developed a 3-D CFD model with the ability to predict the occurrence of a hydraulic shock for a given condition. In particular, slug formation, slug propagation, shock formation with correct amplitudes and time of formation can be predicted for a given liquid depth, hot vapor flow rate, initial temperature and pressure, liquid subcooling, and piping geometry. The results show a remarkable match to experimental results. The final report illustrates the first time such a complex problem has been successfully simulated using a 3-D compressible multiphase CFD model, demonstrating the utility of such a tool to increase the operational safety of industrial refrigeration systems.

A technical paper has been submitted for future publication in ASHRAE Transactions.

TC 10.3, Refrigerant Piping, Controls and Accessories sponsored 1569-RP, CFD Study of Hydraulic Shock in Two-Phase Anhydrous Ammonia. Dr. Djamel Lakehal with ASCOMP USA was the principal investigator.