This study proposes a control method that integrates deep reinforcement learning with load forecasting, to enhance the energy efficiency of ground source heat pump systems. Eight machine models are first developed predict future cooling loads, and optimal one is then incorporated into learning. Through interaction environment, strategy identified using Q-network optimize supply water temperature from source, allowing for savings. The obtained results show XGBoost model significantly...

The accurate prediction of residential heat load is crucial for effective heating system design, energy management, and cost optimization. In order to further improve the accuracy model, this study introduced principal component analysis (PCA), minimum sum squares combined errors (minSSE), genetic algorithm (GA), firefly (FA) into back propagation (BP) ELMAN neural networks, established three kinds models. proposed methodologies are evaluated using real-world data collected from buildings...

Solid particle erosion is a serious issue in centrifugal pumps that may result economic losses. Erosion prediction pump complex because the flow field inside it three-dimensional (3D) unsteady and can be affected by numerous factors. In this study, solid of entire for liquid–solid investigated numerically. Two-way coupled Eulerian–Lagrangian approach adopted to calculate interaction. The reflection model proposed Grant Tabakoff Erosion/Corrosion Research Center are combined rate predict...

Abstract Three-dimensional (3D) unsteady Reynolds-averaged Navier–Stokes (URANS) flow simulations are conducted to investigate the highly field at part load operation of a centrifugal pump. By availability measurement data in impeller wake region, thorough validation simulation method is performed. Grid independence results ensured. Unsteady characteristics terms head and shaft power as well transient blade loads evaluated assess pump performance. Significant mis-loading blading revealed...

The combined radiant floor and fan coil cooling (RFCAFC) system is widely used due to its high comfort large energy saving potential. In this study, as an example, the RFCAFC was studied in a humidity environment Jinan, Shandong Province, China. novelty of lies ability automatically adjust water supply temperature real time according outdoor meteorological conditions, achieving thermal while eliminating likelihood condensation on surface. Days with similar conditions were grouped, level...

In order to study temporal and spatial variation of energy loss reveal influence rule clocking effect on flow field in centrifugal pump with vaned diffuser, numerical simulations were carried out. Numerical validated by experiments. Local equilibrium turbulence generation dissipation was verified state feasibility methods. Hydraulic each component assessed, which shows that hydraulic volute is more significant due than other components. Vortical structure varies greater under different guide...

In this study, energy loss within a centrifugal pump is investigated by post-processing three-dimensional unsteady flow field through kinetic dissipation theory. The predicted solving Reynolds-averaged Navier–Stokes equations. consists of three parts: averaged dissipation, turbulent and near-wall revised dissipation. total value variations dissipations in the with flowrate are compared. Results show that increase flowrate, gradually increases, first decreases then reaches minimum at design...

Half vaned diffuser is widely used in compressors but rarely centrifugal pumps. There are few studies on the application of half pumps, and mechanism reducing energy loss pumps has not been revealed. This paper applies entropy generation theory Ω-method to correlate external characteristics, internal flow, reveal that can move high efficiency zone large flow rate improve efficiency. The results showed highest 55.07% under 0.91 times design when used, while 56.82% 1.13 used. mainly improves...

The existing project management software cannot demonstrate the relation of group collaboration during a project, while they are useful for many projects to control their progress and process. Given drawbacks, this paper introduces storyline, visualization technology that can make up limitation. complex be visualized by storyline layout through mappings being from developer's entity object lines, job tasks inter-sessions, cooperative among objects distance between lines. result shows works...

The performance and service life of centrifugal pumps can be influenced by the clocking effect. In this study, 3D numerical calculations based on k-omega shear stress transport model are conducted to investigate effect in a pump. Time-averaged behavior transient analyzed. Results show that optimum diffuser installation angle pump is [Formula: see text] due minimum total pressure loss radial force acting impeller. Total loss, particularly volute, considerably difference volute at different...

The clocking position of the vaned diffuser, circumferential diffuser relative to volute, has a certain effect on performance centrifugal pump. Therefore, this paper studies guide vane pump from aspects pressure pulsation, hydraulic performance, and energy loss. maximum difference in efficiency is 3.4% under design flow rate, head coefficient 4.7%. pulsation present different trends with increase clock angle. When are relatively good, distance between tongue upstream blade 3/4 path. In...

Unsteady pressure pulsation and energy loss both in diffuser volute of a single-stage centrifugal pump with three different vaned outlet diameters were investigated. Reynolds-Averaged Navier-Stokes (RANS) equations combined shear stress transport (SST) turbulence model used to predict flow field the pump. Results showed that amplitudes blade-passing frequency high-frequencies gradually decrease diameter increases. Moreover, better periodicity than due interaction between impeller.

The accuracy of linear eddy-viscosity URANS turbulence modelling is assessed for off-design operation a single stage radial centrifugal pump. open source software OpenFOAM utilized. Hot wire probes have been utilized measurement spatially and temporally resolved validation data at the impeller discharge air-operated ensemble-averaged mean flow angle in qualitatively good agreement to entire range, while minor deviations occur close volute tongue due impeller-volute interaction. Turbulence...

Erosion wear caused by solid particles is recognized as one of the major concerns for centrifugal pumps. In this paper, a two-way coupled Eulerian-Lagrangian approach employed to solve solid-liquid flow in pump. The erosion model developed Erosion/Corrosion Research Center (E/CRC), combined with Grant and Tabakoff particle-wall rebound model, are predict behaviors wear. Three-dimensional transient calculation pump carried out research performance influence concentrations diameters also...

The energy efficiency of water supply systems in high-rise residential buildings has become a significant concern for sustainable development recent times. This work presents numerical investigation on the influence diffuser vane height flow variation and hydraulic loss volute centrifugal pump. Experiments simulations were conducted with four different ratios. results validated against experimental data. losses components numerically evaluated at varying guide blade heights. changes patterns...

Photovoltaic double-skin glass is a low-carbon energy-saving curtain wall system that uses ventilation heat exchange and airflow regulation to reduce gain generate portion of electricity. By developing theoretical model the ventilated photovoltaic conducting numerical simulations, this study analyzes variation patterns power generation efficiency for different inclination angles, seasons, thermal spacing, transmittance in system. The results indicate positive correlation between surface...

Numerical simulations of a canned motor pump at partial load condition have been conducted for studying the strong rotor–stator interaction. SST [Formula: see text] turbulence model with wall function was adopted solving three-dimensional (3D) unsteady Reynolds-averaged Naiver–Stokes (URANS) equations. The inner flow field four typical rotor positions, where head changes significantly, explored. It has shown that when blade approached tongue region, radial velocity decreased pressure suction...

The increasing quantity of air pollutants generated by automobiles can cause significant harm in relatively enclosed indoor environments. Studying the distribution under different conditions underground parking garages is great significance for improving quality and reducing casualties event a fire. This article presents geometric model an garage based on PHOENICS modeling. related results CO concentration fire temperature ventilation are obtained. Based velocity as well during fire,...

With the increasing demand for clean energy, offshore wind power is developing rapidly. But compared to onshore situation, working environment at sea very complicated. In order ensure stable operation of generators, higher requirements are put forward capability structures resist and waves. This paper proposes a new combined vibration suppressing device, which can be used suppress swaying floating generator under The station tower was modeled, wave force torsion were analyzed, fluid...