Optimal design and operation of a central domestic hot water heat pump system for a group of dwellings employing low temperature waste heat as a source
2019
Hervás-Blasco, Estefanía | Navarro-Peris, Emilio | Corberán, José Miguel
In this work, a study of an energy recovery system from a low-grade temperature source based on heat pumps for domestic hot water is done. The main components of the system are a pre-heating heat exchanger, an optimized heat pump for domestic hot water production, and a variable-volume storage tank. A model has been developed in TRNSYS to analyse the best configuration and control strategy of the system in order to satisfy the profile demands of 10, 20, and 30 multifamily houses, which are considered as a representative target market for this type of application. From this analysis, the influence of the design/sizing parameters on the system CO₂ emissions has been obtained and a design criterium for their minimization has been supplied. Finally, a sensitivity analysis based on different net and heat source temperatures has been done in order to estimate the generalizability of the proposed solution. The obtained results show that this kind of system, with the proper design, sizing, and operation, offers potential CO₂ emissions reductions by a factor of almost five compared to a conventional gas boiler system but a bad system selection could reduce this potential benefit up to 25%.
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