The paper presents the idea of replacing fuzzy controllers with interpolative ones in complicated control structures, in order to reduce the complexity of the structure, visible in implementation method and calculus time. There are presented main theoretical and procedural aspects related to design and implementation of interpolative controllers. As a study case an interpolative control structu...

This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus multi-pass water heating schemes. The once-through systems outperformed the multi-pass systems by 10% for the system wi...

Introduction A thermoacoustic engine is a device absorbing heat at the hot heat exchanger and releasing heat at the cold heat exchanger while producing acoustic work as an output. Engines are built to carry a load, which in the case of an acoustic device, might include a thermoacoustic refrigerator [4], a (possibly linear) electric generator [2] etc. Coupling between the engine and the load inf...

A vertical geothermal probe consists of two or four polyethylene tubes U-shaped, used for circulating the coolant between the heat pump and the ground. It is installed in a deep borehole and sealed in a special grout, a kind of liquid cement, used to seal the borehole, and avoid the presence of air bags between the probe and the ground. Moreover, the grout provides a heat transfer medium betwee...

In this paper, Hammerstein model and Nonlinear AutoRegressive with eXogeneous inputs (NARX) model are used to represent tubular heat exchanger. Both models have been identified using least squares support vector machines based algorithms. Both algorithms were able to model the heat exchanger system without requiring any apriori assumptions regarding its structure. The results indicate that the ...

Title of Document: DEVELOPMENT OF MULTI-SCALE, MULTI-PHYSICS, ANALYSIS CAPABILITY AND ITS APPLICATION TO NOVEL HEAT EXCHANGER DESIGN AND OPTIMIZATION Omar Abdelaziz Ahmed Abdelaziz, Doctor of Philosophy, 2009 Directed By: Reinhard Radermacher, Professor Department of Mechanical Engineering Heat exchanger development using enhanced heat transfer surface designs and optimization techniques is a c...

We present a probabilistic approach to state estimation and control of industrial processes. In particular, we adopt a jump Markov linear Gaussian (JMLG) model to describe an industrial heat exchanger. The parameters of this model are identified with the expectation maximisation (EM) algorithm. After identification, particle filtering algorithms are adopted to diagnose, in real-time, the state ...

BACKGROUND Ground source heat pumps is a building energy conservation technique. The underground buried pipe heat exchanging system of a ground source heat pump (GSHP) is the basis for the normal operation of an entire heat pump system. METHODS Computational-fluid-dynamics (CFD) numerical simulation software, ANSYS-FLUENT17.0 have been performed the calculations under the working conditions o...