In this paper, a simple neu approach for the grassroots and retrofit design of water utilization systems with multiple contaminants is presented. This approach uses a combination of mathematical programming and necessary conditions of optimality to automatically generate the optimal solution featuring minimum capital and operating costs. This paper presents the only existing method to solve thi...

In this paper the problem of establishing the optimal trade-off between investment cost for the retrofit and expected revenue that result from increasing flexibility in systems described by nonlinear models is addressed. A systematic procedure is first proposed for constructing the cost versus flexibility curve. A stochastic optimization method is then presented for evaluating the expected opti...

In this paper, we present a methodology for the retrofit of water utilization systems using mathematical optimization. The problem consists of determining the best re-piping and the capacity of a new treatment unit (if any) to be introduced to generate the best retrofit. Instead of reducing water consumption, or maximizing savings, we resort to analyze the problem using a more comprehensive vie...

E nergy costs are the largest percentage of a hydrocarbon plant’s operating expenditures. This is especially true of the distillation process, which requires substantial energy consumption. Concerns over recent high costs and economic pressures continually emphasise the need for efficient distillation design and operation without a loss of performance. This article illustrates how energy-effici...

Coordinated large scale building retrofit is one of the most effective approaches not only to reduce environmental footprint existing buildings but also assure that climate goals can be met. Existing bottom-up become infeasible or lack in terms accuracy and/or computational cost especially when application increases size. Hence, aim this paper propose and develop a approach for large-scale with...

a new retrofit targeting procedure, based on pinch technology has been developed. the new procedure considers existing structure of a given network and finds the most compatible configuration with the network. to achieve this aim, the procedure uses a linear programming technique that maximize the compatibility. good compatibility between old and new networks helps to make the best use of capit...

The energy recovery performance of crude pre-heat trains (PHTs) in oil refineries is typically impaired by deposition over time of fouling on the thermal surfaces. Such time varying effects are normally not considered in the design or retrofit of heat exchangers networks. In this paper, the importance of taking into account such effects is demonstrated, bymeans of a case study. An existing indu...

In this study, a complete evaluation procedure of energy-saving and efficiency improvement for a large-scale hospital retrofit project has been established and successfully validated in Taiwan. The retrofit scheme, in integrating the alternative hot water system, namely, a water source heat pump (WSHP), with the existing HVAC (Heating, Ventilating, and Air-Conditioning) system, enables the capa...