This paper describes twocase studies: 1) a cogeneration system of a hospital and 2) a heat pump system installed in an aquarium that uses seawater for latent heat storage.The cogeneration system is an autonomous system that combines the generation of electrical, heating, and cooling energies in a hospital. Cogeneration systemscan provide simultaneous heating and cooling. No technical obstacles were identified for implementing the cogeneration system. The average ratio between electric and thermal loads in the hospital was suitable forthe cogeneration system operation. An analysis performed for a non-optimized cogeneration system predicted large potential for energysavings and CO2 reduction.The heat pump system using a low-temperature unutilized heat source is introducedon a heatsource loadresponsiveheat pump system, which combines a loadvariation responsive heat pump utilizing seawater with a latent heat-storage system (ice and water slurry), using nighttime electric power to level the electric power load. The experimental coefficient of performance (COP) of the proposed heat exchanger from the heat pump system, assisted by using seawater as latent heatstorage for cooling, is discussed in detail.
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