PRELIMINARY RESULTS OF STATISTICAL DYNAMIC EXPERIMENTS ON A HEAT EXCHANGER

The inherent noise signals present in a heat exchanger were recorded and analyzed in order to determine some of the statistical dynamic characteristics of the heat exchanger. Preliminary results show that the primary-side temperature frequency response may be determined by analyzing the inherent noise. The secondary-side temperature frequency response and cross-coupled-temperature frequency responses between primary and secondary were poorly determined because of the presence of a nonstationary noise source in the secondary circuit of the heat exchanger. This may be overcome by correlating the dependent variables with an externally applied noise signal. Some preliminary experiments with an externally applied random telegraph type of signal are reported. (auth)