Based on Computer Software to Analysis the Influence of Geometry Parameters of Herringbone Plate Heat Exchanger Plate on Heat Exchange Performance Based on computer software (FLUENT) to simulate the diversion region and heat exchange region of herringbone plate heat exchanger. An internal fluid model of a diversion zone and a heat exchange zone consisting of two sets of plates with different geometrical parameters was established. The velocity, temperature and pressure distribution of the flow field in the model were analyzed to investigate the effect of different tilt angles and peak spacings on the heat transfer performance of the herringbone plate heat exchanger under the same arc radius. The results show that when the peak spacing h  20 mm, the herringbone plate with radius of arc R  180 mm the inclination (phi  20 circ ) has better heat transfer performance than the herringbone plate with the radius of arc R  140 mm the inclination (phi  30 circ ). Provides basis for optimizing design of diversion zone of herringbone plate heat exchanger plate.

Numerical investigation on a low energyconsumption heating method for recirculating aquaponic systems Abstract   In a recirculating aquaponic system (RAS), the heating method based on an electric heater requires considerable amounts of electrical energy to maintain the water temperature for optimal warmwater fish growth conditions. Minimizing electrical energy consumption in the RAS is a great challenge. To solve this problem, a novel heating method that uses a combination of helically coiled heat exchangers (HCHEs) and a thermal energy storage (TES) unit is proposed to replace the electric heater. Several studies on heating and cooling systems with HCHEs and TES tanks have been conducted, but their integration in RASs is very rare. In this study, the thermal energy of the water in an RAS was the research objective. A computational fluid dynamics approach was adopted for transient analysis and inspection of the HCHE model considering eight cases with four temperature levels, 55, 60, 70, and 80xc2xa0xc2xb0C, and three mass flow rates, 0.166, 0.249, and 0.332xc2xa0kgs. The results showed that the HCHE was compatible with the regular heat sources of the TES unit (including solar collectors and heat pump systems). The temperature distribution of the water in the fish tank, from 26.75 to 30xc2xa0xc2xb0C, was suitable for maintaining the health of warmwater fish. To heat 3.4xc2xa0m3 of the fish tank water from 24.5 to 28xc2xa0xc2xb0C, case 6 (where the temperature and mass flow rate of hot water were 70xc2xa0xc2xb0C and 0.332xc2xa0kgs, respectively) obtained the best results during a period of 26xc2xa0min, usable heat transfer rate of 31.8xc2xa0kW, and thermal efficiency of 76.1%. On the contrary, the results for case 1 (where the temperature and mass flow rate of hot water were 60xc2xa0xc2xb0C and 0.166xc2xa0kgs, respectively) were 70xc2xa0min, 11.8xc2xa0kW, and 57.5%, respectively.