ENERGY RECOVERING USING GREYWATER AS COLD BODY IN A CO_2 HEAT PUMP WATER HEATER

摘要

The use of heat pumps for the production of domestic water is a fact nowadays. Our research group is involvedin a project for the characterization of different configurations of CO_2 heat pumps for the production of hotwater by recovering the energy contained in the greywater, used this as secondary fluid in the evaporator. Thiswill be done numerically by means of a dynamic study of the different options. As a first step, we haveconstructed an installation to experimentally analyses these systems and to validate the models we aim to usein the process. So, in this paper, a description of the experimental facility developed is presented. This allowstesting four different configurations for the refrigeration circuit which let us to compare their energy efficiency,control capabilities and initial cost and determine what the best solution is. The system is modeled dynamicallyby using TRNSYS® 17. The data reduction process followed to determine the main operating parameters ofthe system, as well as a brief description of the uncertainty analysis is presented. The paper finishes presentinga comparison between some preliminary experimental results and the results obtained by using the numericalmodel developed in TRNSYS® 17.