Effects of bypass-stream manipulations on disturbance-propagation paths in heat exchanger networks
Turkish Journal of Engineering & Environmental Sciences, cilt.19, sa.1, ss.43-51, 1995 (Scopus, TRDizin)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 19 Sayı: 1
- Basım Tarihi: 1995
- Dergi Adı: Turkish Journal of Engineering & Environmental Sciences
- Derginin Tarandığı İndeksler: Scopus, TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.43-51
- Boğaziçi Üniversitesi Adresli: Evet
Özet
The effects of bypass streams on disturbance-propagation paths in heat-exchanger networks (HENs) are investigated. Two constrained, nonlinear, optimization problems (minimization of the sum of (i) bypass fractions, and (ii) target-temperature deviations subject to target-temperature range contraints) are presented for a fixed bi-directional disturbance to a typical pre-designed HEN. Different range constraints on the hot and the cold targets are imposed in order to demonstrate the possibility of creation of alternate disturbance-propagation (disturbance-rejection) paths via bypass-stream manipulations. It is shown that propagation direction of a disturbance vector can be forced towards either the hot or the cold end of a pre-designed HEN with minimum target-temperature deviations using different sets of bypass fractions. Nonuniqueness of the optimal solution and nonconvexity problems are also discussed. (Authors)