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This paper presents a field study of indicators of the performance of absorption refrigerating systems in the Sudano-Sahelian region of Cameroon. A modeling of various components of the system is performed in order to choose the technology best adapted for the region. Based on the characteristics from the manufacturers, four absorption chillers were studied; namely: EAW Schüco LB 15 and 30; Rotartica Solar 045 and Sonnenklima Suninverse. The model of Kühn and Ziegler and meteorological data of the city of Maroua ((14.33 °E, 10.58 °N) were used to assess the coefficient of the performance (COP) of these machines. Results showed that the Sonnenklima Suninverse technology is best suited for the climatic conditions of the Sudano-Sahelian region with COP values between 1.5 and 3.5.

This study presents an estimation of Curie point depth (CPD), heat flow and geothermal gradient from spectral analysis over the Adamawa volcanic region (northern Cameroon). The spectral analysis method is applied to the reduced-toequator (RTE) magnetic anomaly data of the region. Grid Earth Magnetic Anomaly (EMAG2) data were divided into 17 zones. RTE magnetic anomaly data were low-pass filtered to remove the effects of topography. Then, the data were transformed into the Fourier domain in order to determine the spectrum of the magnetic anomaly data for the study region. Then, the depth values are used to estimate the CPD, the geothermal gradient (GG) and the heat flow in the Adamawa region of Cameroon (Central Africa). The acquired results indicate that the CPD varies between 15.97 and 41.16 km with an average of 27.52 km. GG varies between 14.09 and 36.31 °C km −1 with an average of 22.27 °C km −1 and the resulting heat flow varies between 35.23 and 90.78 mW m −2 with an average of 55.68 mW m −2 . The variation in heat flow and GG shows an abnormal geothermal condition of the area. It is found that there is a geothermal potential precisely at Woulndé in the Adamawa region. The obtained results can serve as a guide for government and private partners to explore this energy source.

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