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CHEN, Xiangyang; ZHU, Yingxin; nakahara, Nobuo. Improvement of the fluid networkis module construction for HVACSIM+. In: BUILDING SIMULATION, 6., 1999, Kyoto. Anais... Kyoto, 1999. p. 1229-1236.
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Abstract

This paper describes improvements to the calculation of duct/pipe system using HVACSIM+. The improvements described resolve problems relating to fluid backflow calculation, and improvements are suggested to achieve a convergence of duct/pipe network calculation. TRNSYS and HVACSIM+ are used separately to set the upstream (input) and the downstream (output) in the joint-ports of each duct/pipe component, and calculate the state in the downstream (or upstream) according to the state (pressure, flowrate, temperature and humidity) of the upstream (or downstream) in the module. Neither TRNSYS nor HVACSIM+ could resolve backflow deriving from the flow information. This problem was solved by improving the TYPE design. TRNSYS and HVACSIM+ processed the variable of each category in parallel. That is, they did not differentiate between the relative importance of variables in each category. In four variables that affect the calculation of duct/pipe network (pressure, flowrate, temperature, and humidity), both pressure and flowrate are coupling variables. Due to the improvement, pressure/ flowrate computation was achieved in one module.
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