Research On Heating Of Natural Impound Water With Thermal Storage And Insulation

Nowadays, the contradiction between the growing energy consumption andfalling energy shortage becomes increasingly serious. Solar energy, as a kind ofclean and pollution-free renewable resource, has been widely used.As one of the representative of new energy, fresh water solar pond ownsextensive application value and prospect. Our country holds abundant fresh wateras well as solar energy resources, in addition, fresh water solar pond owns theincomparable virtues against the traditional salt gradient solar pond, fresh watersolar pood should be attracting, however related research about fresh water solarpool far less that of salt gradient solar pond.Solar pood’s thermal performance was highlighted in this study. Based onprevious researches on all kinds of solar ponds and surface water source heat pump,the targets of this paper were mainly focused on the natural static water such asponds, reservoirs, lakes etc. Long term water temperature variation and heatingcapacity of the proposed system were discussed through seasonal solar heat storageand thermal preservation measures, i.e., covering different kind of transparentplastic films on the surface of water.Firstly, proper thermal insulation method of natural still waters wasdetermined via comparative experiments on lab-scale in this article. Then relatedparameters which would be used in the following works were deduced, such asoverall heat loss coefficient of coverings and sunlight transmission rate.Secondly, a2-D natural quiet waters temperature model was established andwater temperature variation on different depth were simulated throughout the year.Thirdly, combined with relevant coverings’ thermal insulation parametersgained through experiments, on the basis of established nature waters temperaturemodel appropriate improvements were done. Annual temperature change of thewaters model was simulated while the surface of water covering heat insulationtransparent film.Finally, this paper recommended a heating system that storage seasonal solarenergy in the natural still waters and extract thermal at the bottom of water forheating coupled with heat pump. Simulation and analysis of water temperatures ofthe recommended model with transparent film coverings were carried out; aiming atinvestigating the system’s heating capacity.