Validation of a Hot Water Distribution Model Using Laboratory and Field Data

Backman, C.¹  Hoeschele, M.¹ 

[1] Alliance for Residential Building Innovation (ARBI), Davis, CA (United States)

关键词: hot water distribution systems;    behavior;    model validation;    hot water usage patterns;    pipe insulation benefits;    residential;    residential building;    ARBI;    Building America;   

DOI  :  10.2172/1220208
RP-ID  :  DOE/GO--102013-3945
PID  :  OSTI ID: 1220208
Others  :  Other: 6442

美国|英语

来源: SciTech Connect

【 摘 要 】

Characterizing the performance of hot water distribution systems is a critical step in developing best practice guidelines for the design and installation of high performance hot water systems. Developing and validating simulation models is critical to this effort, as well as collecting accurate input data to drive the models. In this project, the Building America research team ARBI validated the newly developed TRNSYS Type 604 pipe model against both detailed laboratory and field distribution system performance data. Validation efforts indicate that the model performs very well in handling different pipe materials, insulation cases, and varying hot water load conditions. Limitations of the model include the complexity of setting up the input file and long simulation run times. This project also looked at recent field hot water studies to better understand use patterns and potential behavioral changes as homeowners convert from conventional storage water heaters to gas tankless units. The team concluded that the current Energy Factor test procedure overestimates typical use and underestimates the number of hot water draws, which has implications for both equipment and distribution system performance. Gas tankless water heaters were found to impact how people use hot water, but the data does not necessarily suggest an increase in usage. Further study in hot water usage and patterns is needed to better define these characteristics in different climates and home vintages.