โ Scribed by G. Cacciola; G. Restuccia; G.H.W. van Benthem
No coin nor oath required. For personal study only.
Research activity on adsorption heat pumps is mainly devoted to the improvement of the heat transfer inside the adsorber bed. To achieve this, various new types of heat exchanger designs and use of additives have recently been proposed. In this paper a study is made into the eect of an increased amount of metal in the adsorbent bed on the coecient of performance (COP) and on the speciยฎc power. This correspondingly aects the energy delivered to the user and the investment cost of the system. A simpliยฎed dynamic model has been developed to calculate the performances of the machine as a function of the extra heat capacity, the global heat transfer coecient and the cost of the material. Finally, a general diagram is proposed in order to evaluate the minimum heat transfer improvement that must be obtained with a higher heat exchanger surface, or when additives and metallic structures, are inserted into the adsorber bed in order to increase the speciยฎc power of the machine.
๐ SIMILAR VOLUMES
A simplified mathematical model has been used to compute the performance of an absorption heat pump-transformer (HPT). This two-stage apparatus, which consists of a heat transformer driven by low-temperature cooling water and of a heat pump driven by high-temperature steam, has been compared with a