Pumping Effect Research Articles

Effect of natural ventilation on aerosol transmission and infection risk in a minibus

High passenger density, prolonged exposure, and close interpersonal distance create a high infection risk (IR) in minibuses. While improving natural ventilation induced by turbulent airflows is essential for controlling IR in minibuses, comprehensive studies on its effectiveness are lacking. To address this, we conducted computational fluid dynamics simulations studies coupling indoor–outdoor turbulent airflows to examine the impact of window opening locations, window opening sizes, and initial droplet diameters (dp) on the ventilation airflow and dispersion of pathogen-laden droplets. Results show that the surrounding turbulent flow patterns create higher surface pressure at bus rear than bus front, which is a key factor influencing bus ventilation. When all windows are closed, ventilation is primarily provided by skylights at bus rooftops. Ventilation through only two skylights resulted in an air change rate per hour (ACH) of 17.55 h−1, leading to high IR of passengers. In contrast, fully opening front and rear windows increases ACH by 27.28-fold to 478.79 h−1, significantly reducing IR by 1–2 orders of magnitude compared to skylight ventilation. Expanding window opening sizes can effectively enhance ventilation when both front and rear windows open (attributed to the pumping effect), while is ineffective when only front windows open. To reduce IR in minibuses, we recommend opening multiple windows at the bus front and rear. Even if the total opening area of the front and rear windows is only two-thirds of that of the front window, its ACH is 2.8 times more than only opening front windows.

The Effect of COVID-19 Pandemic on Quality of Life in Children with Type 1 Diabetes Mellitus and Their Families Using Insulin Infusion Pumps

Objective: This study aimed to assess the impact of the coronavirus disease (COVID-19) pandemic on the quality of life (QOL) of children with type 1 Diabetes Mellitus (T1DM) and their families, specifically focusing on the effects of insulin infusion pumps. We also aimed to identify changes in both children's and parents' QOL during the pandemic period. Methods: This study utilized the KINDL (KINDer Lebensqualitätsfragebogen: Children’s QOL) questionnaire for the children, and the World Health Organization Quality of Life (WHOQOL)-BREF Turkish Version (TR) (WHO-QOL-BREF-TR) scale for their parents. Data were collected using Google Forms, with assessments performed before and during the pandemic. Results: The study included 61 participants, 38 of whom were female (62.3%), with a mean age of 12.7±2.9 years and a mean diabetes duration of 6.4±2.5 years. Pre-pandemic KINDL scores for "emotional health" and "school" were significantly higher than those during the pandemic (p=0.022 and p=0.002, respectively). Surprisingly, HbA1c levels improved during the pandemic compared to the pre-pandemic values (p

Hemodynamic effects of intra-aortic balloon pump in patients with advanced heart failure and cardiogenic shock waiting heart transplant

Abstract Background The use of intra-aortic ballon pump (IABP) as a bridge therapy in patients with advanced heart failure (HF) and cardiogenic shock (CS) waiting heart transplant (HTx) remains under debate. IABP can be an available device to improve hemodynamic conditions of these patients until HTx. Purpose Evaluate the hemodynamic effects of IABP and its efficacy in patients with advanced HF and CS waiting HTx. Methods We retrospectively analyzed from a single center intensive care unit, between 2009 and 2020, patients with advanced HF with optimized intravenous drugs that required IABP placement before HTx. Changes in oxygen central venous saturation (ScvO2), arterial lactate, renal function, and use of vasoactive drugs before and 96 hours after IABP insertion were evaluated. Patients with acute myocardial infarction and implant of ventricular assist device before HTx were excluded. Results A total of 199 patients (mean age 46,5 ± 12 years) were included. Median time of IABP onset to HTx was 20 days. Mean left ventricle ejection fraction was 23,5 ± 5,9%, 53,7% of patients had moderate to severe right ventricular dysfunction and the most frequent etiology was Chagas disease (47,2%, n=94). Before the IABP placement, 97,47% of patients were using dobutamine, 19,29% milrinone, 58,08% nitroprusside and 17,7% norepinephrine. Clinical and laboratory data were compared before and 96 hours after IABP therapy. ScvO2 increased from 49,9% to 66,85% (p<0,001), lactate decreased from 21,91 mg/dl to 12,6 mg/dl (p<0,001), creatinine decreased from 2,04 mg/dL to 1,72 mg/dL (p=0,301) and urine output increased from 1690,12 mL/24h to 2193,12 mL/24h (p<0,001). These differences were maintained until the day before HTx. Use of nitroprusside increased from 58,08 to 63,59% (p=0,154), and the use of norepinephrine decreased from 17,7% to 6,63% (p<0,001). Conclusion IABP improves tissue perfusion, renal function, and hemodynamic status in patients with advanced HF and CS and can be an effective method of circulatory support as a bridge therapy to HTx.Laboratory data pre and post-IABPVasoactive Drugs pre and post-IABP

Direct comparison of mechanical circulatory support devices in porcine model of acute myocardial infarction complicated by ventricular septal defect and cardiogenic shock

Abstract Introduction Despite urgent clinical need, until now optimal strategy for mechanical circulatory support in acute myocardial infarction (AMI) complicated by ventricular septal defect (VSD) and cardiogenic shock has not been determined. Purpose The aim of our study was to compare hemodynamic effects of intra-aortic balloon pump (IABP), extracorporeal membrane oxygenation (ECMO) and Impella CP in the animal model of AMI complicated by VSD and cardiogenic shock. Methods Under general anesthesia and mechanical ventilation in pigs (sus scrofa domestica), using partial sternotomy, AMI was induced by ligation of left anterior descending. VSD was simulated by insertion of 25F cannulas into the left and right ventricles and their extracorporeal connection by 3/8 tubes generating left-to-right shunt. The hemodynamic effect of ECMO (2 L/min), IABP, and Impella CP (2 L/min) was evaluated by the measurement of the left ventricular end-diastolic pressure (LVEDP), mean arterial pressure (MAP), carotid flow (CAR) as a surrogate of total circulatory output, and VSD flow. Data are presented as mean (SD), P < 0.05 was considered statistically significant. Results Eleven animals were used, one died after induction of AMI, ten pigs completed all study procedures. Baseline (no mechanical support) LVEDP was 13.8 (3.0) mmHg, MAP 54.5 (11.0) mmHg, CAR 290.9 (37.3) mL/min, and VSD 1174.0 (499.3) mL/min (Table 1). IABP significantly improved all parameters in comparison to Baseline (Table 1). ECMO significantly improved MAP and CAR not only in comparison to Baseline but also in comparison to IABP and Impella; on the other hand, ECMO increased VSD flow (Table 1). Impella significantly improved all parameters with the largest effect on LVEDP and VSD flow (Table 1). Conclusions All tested devices improved the key hemodynamic parameters of MAP and CAR, however each to different extent. Individual devices influenced differently LVEDP and VSD flow. The results of this study may help in selection of optimal therapeutic strategy in AMI complicated by VSD and cardiogenic shock.Table 1.Hemodynamic outcomes.

The Effect of Air–Water Mixture on the Dynamic Response of a Hydrodynamic Journal Bearing With Inclined Grooves

Abstract Water-lubricated hydrodynamic journal bearings with deep inclined grooves are often used to support radial loads and dampen pump vibrations in nuclear power plants. The inclined grooves increase the pumping effect of the lubricant thus reducing wear and friction during rotor startup and coast-down. The deep grooves also facilitate the removal of debris without damaging the bearing. The load capacity and the stability of this type of bearing are studied in the present work. A sensitivity study of the impact of the number of grooves on bearing performance underlined the superiority of the journal bearing with two inclined grooves. Moreover, these journal bearings may operate with a mixture of water and air. This compressible two-phase lubricant will modify the load capacity and the stability of the journal bearing. The impact of the ingested volume fraction of air is therefore investigated. A physical model of the homogeneous air–water mixture linking the local air volume fraction with the pressure was used in conjunction with the numerical solution of the compressible Reynolds equation on an unstructured grid. It was found that the air ingestion in the two-inclined grooves journal bearing decreases the load capacity but improves the stability for mild and low loads.

Design of Terrace-Based Hydroponic System using Hydraulic Ram Pump

The primary objective of the study is to design a terrace-based hydroponic system incorporating a hydraulic ram pump and to evaluate the effectiveness of the hydraulic ram pump in terms of drive head, flow rate, and delivery head, while also assessing its overall performance, particularly in terms of water loss percentage. The hydraulic ram pump can deliver a delivery head of 200 cm. To achieve this 200 cm delivery head, a drive head of 20 cm and a drive pipe length of 60 cm are necessary. The flow rate of the ram pump at the delivery pipe is 1.13 liters per minute. The water balance equation was employed to quantify water loss, considering parameters such as initial water volume in storage tanks, water collected in excess water collectors, and overall water losses during a system operation. The study's key findings reveal that during each 15-minute operational cycle, the terrace-based hydroponic system, incorporating a hydraulic ram pump, experienced an average water loss of 4.59 liters, equating to a 2.7% water loss percentage. This 2.7% loss could have a significant impact on sustainability if the system were to be upscaled.

Static Characteristics of Hybrid Water-Lubricated Herringbone Groove Journal Bearing

Abstract The hydrodynamic herringbone groove journal bearing (HGJB) performs exceptionally well at high speeds but is limited by a low load-carrying capacity, largely due to the lubrication characteristics of water. To address this issue, a hybrid water-lubricated HGJB is proposed in this study. A lubrication model for the high-speed hybrid water-lubricated HGJB is developed, taking into account turbulence, thermal effects, and tilt. A comparative analysis of the static characteristics is conducted between the hybrid HGJB and both the hydrodynamic HGJB and the hybrid plain journal bearing (PJB). The results show that the proposed hybrid water-lubricated HGJB offers significantly greater load-carrying capacity than the conventional hydrodynamic HGJB, particularly during start-up or at low speeds. For example, when the bearing operates at 1,000 rpm with an eccentricity ratio of 0.5, the load-carrying capacity of the water-lubricated hybrid HGJB under a supply pressure of 1.6 MPa reaches 650 N, compared to just 261 N for the water-lubricated hydrodynamic HGJB. Additionally, the hybrid water-lubricated HGJB demonstrates a higher flow rate and lower temperature rise than the traditional hybrid PJB, thanks to the improved pumping effect of the herringbone grooves at high speeds.

Underestimation of global soil CO2 flux measurements caused by near-surface winds

Soil respiration (Rs) is the largest source of atmospheric CO2, and an accurate understanding of the relationship between near-surface winds, CO2 release from the soil surface, and measurement methods is critical for predicting future atmospheric CO2 concentrations. In this study, the relationship between wind speed and soil CO2 fluxes is elucidated on a global scale through meta-analysis, and the flux measurement methodology is further explored in conjunction with the results of a controlled trial to clarify the uncertainty of the measurement results. The results indicate that near-surface wind speed is positively correlated with soil CO2 release and that near-surface winds result in increased soil CO2 gas release. Wind disturbance affects both the concentration gradient and gas chamber measurements, and the lower calculated soil CO2 release conflicts with the notion that the wind pump effect and Bernoulli effect of negative pressure cause a greater surface gas exchange. The results of the log-response ratios indicate that near-surface winds lead to an underestimation of 12.19–19.75% in widely-used gas chamber method measurements. The results of this study imply that some of the current Rs measurements are biased and that the influence of near-surface winds on Rs measurements needs to be urgently addressed to assess the terrestrial carbon cycle more accurately and develop climate change response strategies.

Highlighting the effects of gravity in a compact thermoacoustic heat pump

We present a numerical study of gravity impact on thermoacoustic heat pumping effects in a compact cavity used as a refrigeration device. More precisely, we show how gravity acts on the temperature distribution, on the mean temperature heat flux along the stack area and on flow dynamics. Studies are performed in a two-dimensional geometrical configuration which is simplified with respect to common experimental devices but sufficiently detailed to take into account the main physical mechanisms. Fluid motion, heat and mass transfer as well as compression/expansion effects are estimated from the computation of the Navier-Stokes equations in the low-Mach number hypothesis coupled with the heat equation in solid parts. The low-Mach number hypothesis is here relevant because the characteristic scale of the acoustic wavelength is much smaller than the geometrical length scales of the cavity. The operating mode is characterized by a moderate drive ratio, a fluid oscillating motion of moderate amplitude and fixed low frequency, typical of such devices. It is shown that when gravity is included, buoyancy effects modify the temperature and velocity fields as well as heat pumping efficiency.

Study on suction effect of water jet propulsion pump based on entropy weight theory

Water jet propulsion pumps start at special stages such as mooring and sailing, the ship is in shallow water, and the underwater keen clearance (UKC) is relatively small, which is easy to induce underwater suction vortex near the inlet position and cause violent vibration of the pumping unit. The powerful suction effect of the water-jet propulsion pump can draw in debris from the bottom of the riverbed, causing damage to the propulsion pump. This research investigated the suction effect of water jet propulsion pump under different UKC conditions. A flow field analysis method based on the entropy weight theory was constructed to reveal the flow characteristics of the flow field where the underwater suction vortex occurs. The research found that the suction effect on the flow field tends to stabilize under the condition of UKC greater than 2.5D0. After UKC reaches 4.2D0, suction effects essentially cease to create large-scale shear stresses near the riverbed. In addition, this research analyzes the vorticity field using vorticity and net circulation to elucidate the vortex strength within the flow field under different UKC conditions. The probability of generation of underwater suction vortices will be greatly reduced when the UKC is greater than 0.83D0.

TCT-791 Do Women Have Less Effect of Mircoaxial Flow Pump in Infarct Related Cardiogenic Shock: A Secondary Analysis of the Danger Shock Trial

TCT-791 Do Women Have Less Effect of Mircoaxial Flow Pump in Infarct Related Cardiogenic Shock: A Secondary Analysis of the Danger Shock Trial

Impact of a tubeless, disposable insulin pump on emergency department visits and inpatient admissions among a Medicare population.

A tubeless, disposable insulin pump (Omnipod DASH Insulin Management System, Insulet Corporation) has demonstrated improved glycemic outcomes for people with diabetes who require insulin. The impact of the system on downstream health care events has not been studied. To assess health care resource utilization for a Medicare population before and after starting tubeless, disposable insulin pump therapy. This retrospective, observational analysis used data from the Centers for Medicare & Medicaid Services 100% Research Identifiable Files. Study outcomes included change in event rates for diabetes-related emergency department (DRED) visits, all-cause emergency department (ACED) visits, diabetes-related inpatient (DRIP) admissions, and all-cause inpatient (ACIP) admissions among Medicare beneficiaries who started the tubeless, disposable insulin pump in 2020 (postpump observation period) as compared with the same duration and calendar period in 2019 (prepump observation period) with no pump use. Subgroup analyses were performed based on Medicare entitlement reason, diabetes type, and diagnosis status for depressive disorder. A total of 811 users met the criteria for analysis: 46.2% had type 2 diabetes, a majority (59.2%) were aged 65 years or older, and 37.0% had a diagnosis for depressive disorder. Significant reductions were observed for DRED of -46.9% (95% CI = -63% to -23%); ACED of -29.0% (95% CI = -37% to -20%); ACIP of -19.9% (95% CI = -32% to -6%). DRIP rates declined notably (-36.6%; 95% CI = -61% to 4%). Event rates observed across subgroups demonstrated consistent downward trends; however, not all were statistically significant. These findings demonstrate that use of the tubeless, disposable insulin pump was associated with reductions in DRED, ACED, and ACIP. Our results provide real-world evidence to support the use of the tubeless, disposable insulin pump among Medicare beneficiaries who require insulin, regardless of diabetes type or Medicare entitlement reason. Additional studies are recommended to further evaluate the effect of insulin pumps on health care utilization among the Medicare population and other insurance populations.

Modulation performance of terahertz waves by titanium disulfide nanosheets towards 6G

AbstractThe TiS2 compound has attracted considerable attention among researchers in the fields of energy storage and conversion, as well as semiconductor materials. This is due to its remarkable capability to incorporate various elements into its van der Waals gap, as well as its potential to adjust the carrier concentration within the material to optimize its electrically relevant properties. In our study, we employed a terahertz (THz) time‐domain spectroscopy system to measure the spectra of TiS2 within the THz frequency range. Through this analysis, we examined the optical parameters, such as transmittance and refractive index, of the TiS2 samples. Additionally, we conducted optical pumping correlation experiments using THz detection technology to investigate the optical pumping effects on TiS2. By analyzing the THz energy transmission process in different states, we were able to calculate and fit the carrier recombination time. The findings of our research hold significant implications for the advancement of THz devices operating in the 6G frequency band.

Study on the transient performance of textured water-lubricated bearings considering different acceleration conditions

This study analyses the transient friction dynamics behavior of water-lubricated bearings (WLBs) with a textured structure, which explains the mechanism of texture structure influencing the hydrodynamic effect of WLB in the physical aspect. A comparison of experimental and numerical data is carried out to validate the proposed mixed lubrication model with a textured structure for WLBs. The effects of texture type, texture angle, acceleration mode, and acceleration time on the nonlinear friction dynamics properties of WLBs are investigated. The result shows that various texture structures exhibit distinct pumping effects and that the optimal friction dynamics performance of WLBs can be achieved by adopting the right herringbone texture and an acceptable texture angle. It is advisable to utilize the reverse S-shaped acceleration mode, as it may efficiently mitigate hydrodynamic shock, minimize frictional contact at the initial startup stage, and control the rotor's vibration in later stages. The brief acceleration time may result in a transient shock that hampers proper lubrication, consequently affecting the stable operation of WLBs. The study's findings offer helpful suggestions for the enhanced design of WLB structures and the mitigation of wear and vibration.

Perencanaan Pompa untuk Mempercepat Waktu Pengisian Oli di PT KSB Indonesia

In this study, specifications & design of the pump to used will be analyzed, then performance the oil pump is known, and effect of the oil pump on the ISP 3600 Trailer pump assembly process is analyzed. This research method begins with problem identification, literature study, analysis & optimization, design planning, fabrication process, assembly process and testing, then analyzed to obtain results in accordance with the objectives. Results this testing use a gear pump with minimum power of 67.15 Watts, using electric motor that has a minimum torque of 1.081 N.m and minimum power of 0.2125 HP, and using minimum capacitor capacity of 24.31 µF. This test uses Fuchs Renolin B46 Plus oil. Results this testing obtain a discharge of 16.789 l/min and charging time of 12.21 minutes per 205 liters.

Origins of Electromagnetic Radiation from Spintronic Terahertz Emitters: A Time-Dependent Density Functional Theory plus Jefimenko Equations Approach.

Microscopic origins of charge currents and electromagnetic (EM) radiation generated by them in spintronic THz emitters-such as, femtosecond laser pulse-driven single magnetic layer or its heterostructures with a nonmagnetic layer hosting strong spin-orbit coupling (SOC)-remain poorly understood despite nearly three decades since the discovery of ultrafast demagnetization. We introduce a first-principles method to compute these quantities, where the dynamics of charge and current densities is obtained from real-time time-dependent density functional theory, which are then fed into the Jefimenko equations for properly retarded electric and magnetic field solutions of the Maxwell equations. By Fourier transforming different time-dependent terms in the Jefimenko equations, we unravel that in the 0.1-30THz range the electric field of far-field EM radiation by the Ni layer, chosen as an example, is dominated by charge current pumped by demagnetization, while often invoked magnetic dipole radiation from the time-dependent magnetization of a single magnetic layer is a negligible effect. Such an effect of charge current pumping by a time-dependent quantum system, whose magnetization is shrinking while its vector does not rotate, does not require any spin-to-charge conversion via SOC effects. In the Ni/Pt bilayer, EM radiation remains dominated by the charge current within the Ni layer, whose magnitude is larger than in the case of a single Ni layer due to faster demagnetization, while often invoked spin-to-charge conversion within the Pt layer provides an additional but smaller contribution. By using the Poynting vector and its flux, we also quantify the efficiency of conversion of light into emitted EM radiation, and its angular distribution.

Haemodynamic effects of intra-aortic balloon pumps stratified by baseline pulmonary artery pulsatility index.

Intra-aortic balloon pump (IABP) devices are commonly used in patients with heart failure related cardiogenic shock (HF-CS), including those with out-of-proportion right ventricular (RV) dysfunction. Pulmonary artery pulsatility index (PAPi) is a haemodynamic surrogate for RV performance. We aimed to assess short-term haemodynamic changes in patients with HF-CS following IABP support stratified by baseline PAPi. This is a single-centre study of 67 consecutive patients with HF-CS who underwent IABP placement between 2020 and 2022. The primary aim was haemodynamic changes of specific variables on pulmonary artery catheter monitoring over 72h following IABP placement. Secondary aims were clinically significant changes in diuretic regimens, changes in inotropes or vasopressors at 72h following IABP, along with clinical outcomes. Prior to IABP placement, 57% of the total cohort (median age 59years [48, 69], 31% female) had Society of Cardiovascular Angiography and Interventions Stage C HF-CS. Thirty-eight (56%) patients had a PAPi <2.0. Following 72h of IABP support, the PAPi <2.0 group had an observed significant decrease in central venous pressure (CVP; 20 to 12mmHg, P<0.001) and mean pulmonary artery pressure (mPAP; 37.5 to 28.5mmHg, P=0.001), and an increase in PAPi (1 to 1.6, P=0.001). No significant change in cardiac index (CI; 2 to 2.1L/min/m2, P=0.31) was observed. The PAPi ≥2.0 group (N=29) had no observed significant change in CVP (10 to 8mmHg, P=0.47), or PAPi (2.6 to 2.8, P=0.92), but there was a significant improvement in CI (1.9 to 2.5L/min/m2, P=0.004) along with reduction in mPA (37 to 29mmHg, P=0.03). The PAPi <2.0 group had a significant increase in diuretic requirement (52.6% vs. 20.7%, P=0.01) and numerically greater addition of inotropes/vasopressors (47.3% vs. 34.4%, P=0.07) compared with the PAPi ≥2.0 group at 72h following IABP placement. Significantly more patients in the PAPi ≥2.0 group underwent left ventricular assist device (55.2% vs. 26.3%, P=0.02), with no overall significant differences observed in escalation to veno-arterial extracorporeal membrane oxygenation, 30-day mortality, renal replacement therapy post-IABP, or rates of heart transplantation. IABP devices in those with HF-CS and low or abnormal PAPi may provide modest short-term haemodynamic benefits without significant improvement in CI, along with greater need for adjustment in medical therapeutics to achieve haemodynamic optimization.

Simultaneously achieving high repetition rate and high peak power in Er,Yb:YAl3(BO3)4 microchip laser

This study presents a dual-ended pumped 1.5 µm Er,Yb:YAl3(BO3)4 (Er,Yb:YAB) passively Q-switched microchip laser, designed to address the challenge of achieving high peak power and high repetition rates simultaneously. The dual-ended pumping method significantly reduces the thermal gradient within the crystal, allowing for higher pump incident power compared to single-ended pumping. Under quasi-continuous-wave (QCW) pumping conditions, the laser achieved a pulse energy of 14.33 µJ, a repetition rate of 470.08 kHz, and a peak power of 2.53 kW. Additionally, we conducted a detailed investigation of the pulse bifurcation phenomenon observed during the experiments, uncovering the underlying mechanisms and their potential impact on laser performance. The results not only demonstrate the effectiveness of dual-ended pumping in enhancing laser performance but also provide valuable insights into thermal management in Er,Yb:YAB crystals. These findings could serve as a foundation for developing more efficient and powerful Er,Yb:YAB lasers, which hold promise for applications in lidar, remote sensing, and range finding.

Inverse design of phononic topological pumping in continuous solids

Topological insulators have been widely studied for their unique properties, particularly their ability to propagate energy with minimal losses in a manner that is robust to structural defects. More recently, topological pumping, which provides a mechanism to transport energy from one location to another in a structure without the need for direct coupling between the locations, has emerged as a phenomena of interest. However, previous studies on topological pumping of phonons have been performed without developing an understanding of how the efficiency of the pumping, as well as control over the pumping pathway in continuous solids, can be systematically controlled. Therefore, in this work we introduce a novel framework for the inverse design of continuous structures that can exhibit topological pumping of phonons, that is based on two key steps: (I) shape design of unit cells that not only exhibit topologically non-trivial edge states, but whose edge states span a wide range of phase values and wavenumbers at the excitation frequency to achieve a robust pumping effect; (II) optimizing the functional form to enable nonlinear modulation of the phase, which enables control both over the pumping path, and also the efficiency of the energy transport along the desired pumping pathway. Using this approach, we are able to establish connections between the dynamical properties of the unit cell, and various properties that impact the pumping efficiency, including the bandgap width, wavevector range, unit cell truncation, and the path of the phase modulation. We further demonstrate the ability to perform pumping for both out-of-plane and in-plane elastic waves, as well as for quantum valley Hall-based topological insulators.

Optimization of Ground Source Heat Pump System Based on TRNSYS in Hot Summer and Cold Winter Region

A cooling tower-assisted ground source heat pump system is proposed to solve the problem of soil heat accumulation in areas with hot summers and mild winters. TRNSYS is used to establish the simulation model of the ground source heat pump system. Taking the ground source heat pump demonstration project in Nanchang City as the research object, the operation effect of the ground source heat pump is simulated and analyzed. The key parameters of the optimization system are proposed, and the operation time of the cooling tower is controlled. The optimization results show that the cooling tower can not only improve the system performance in a short time but also enable long-term stable and efficient operation of the refrigeration system, the compound ground source heat pump system optimized by the cooling tower has almost no soil heat accumulation, and the system performance has been improved. The optimal running time of the cooling tower is 3216~4344 h and 5424~6696 h, and the system running effect is the best at this time. The research results can provide a theoretical basis for the optimal design of the cooling tower auxiliary ground source heat pump system.