scholarly journals SIMULATION STUDY ON THE PERFORMANCE OF A MULTI-FUNCTION HEAT PUMP SYSTEM WITH HEAT STORAGE TANK FOR RESIDENTIAL HOUSES

2000 ◽  
Vol 65 (529) ◽  
pp. 61-68
Author(s):  
Makoto SATOH ◽  
Mitsuhiro UDAGAWA
Keyword(s):  
Heat Pump ◽  
Simulation Study ◽  
Storage Tank ◽  
Heat Storage ◽  
Pump System ◽  
Heat Pump System

scholarly journals A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 554
Author(s):  
Hongkyo Kim ◽  
Yujin Nam ◽  
Sangmu Bae ◽  
Jae Sang Choi ◽  
Sang Bum Kim
Keyword(s):  
Heat Pump ◽  
System Performance ◽  
Storage Tank ◽  
Heat Storage ◽  
Design Method ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
High Efficient

A ground source heat pump system is one of the high-efficient technologies for space heating and cooling since it uses stable underground temperature. However, in actual application, many situations cannot be achieved due to the unsuitable design of operation. In particular, the design characteristics of buildings with different building load patterns are not reflected by the conventional design method. Moreover, the design capacity of the heat pump can be reduced by designing less capacity than the peak load through the introduction of the heat storage tank, but there is no related quantitative design method. Therefore, in this study, the effect of the ground source heat pump system design factors such as shape, length of the ground heat exchanger, and the capacity of the heat storage tank on the system performance was analyzed. To quantify the effect of such factors on system performance, an experimental plant was constructed and case studies were conducted for each design factor.

scholarly journals Designing and Optimizing Heat Storage of a Solar-Assisted Ground Source Heat Pump System in China

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Yan Gao ◽  
Zhi Sun ◽  
Xinxing Lin ◽  
Chuang Wang ◽  
Zongyu Sun ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Storage ◽  
Ground Source Heat Pump ◽  
Cold Region ◽  
Annual Average ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

The cold accumulation problem can lead to performance degradation of heat pumps. This paper presents the design and optimization of a solar-assisted storage system to solve this issue. A ground source heat pump (GSHP) project was established using the transient system simulation program (TRNSYS) based on a ground heat exchange theoretical model, which was validated by a previously established experiment in Beijing. The Beijing, Harbin, and Zhengzhou regions were used in numerical simulations to represent three typical cities where buildings require space heating (a cold region, a severe cold region, and a hot summer and cold winter region, respectively). System performance was simulated over periods of ten years. The simulation results showed that the imbalance efficiencies in the Beijing, Harbin, and Zhengzhou regions are 55%, 79%, and 38%, respectively. The annual average soil temperature decreases 7.3°C, 11.0°C, and 5.3°C during ten years of conventional GSHP operation in the Beijing, Harbin, and Zhengzhou regions, respectively. Because of the soil temperature decrease, the minimum heating coefficient of performance (COP) values decrease by 23%, 46%, and 11% over the ten years for GSHP operation in these three regions, respectively. Moreover, the simulation data show that the soil temperature would still be decreasing if based on the previous solar energy area calculation method. Design parameters such as the solar collector size are optimized for the building load and average soil temperature in various cold regions. Long-term operation will test the matching rate of the compensation system with the conventional GSHP system. After the system is optimized, the solar collector area increases of 20% in the Beijing region, 25% in the Harbin region, and 15% in the Zhengzhou region could help to maintain the annual average soil temperature balance. The optimized system could maintain a higher annual average COP because of the steady soil temperature. It provides a method for the design of a solar collector area which needs to be determined in the seasonal heat storage solar ground source heat pump system.

A novel semi-coupled solid desiccant heat pump system - Part 1: Simulation study

2020 ◽  
Vol 120 ◽  
pp. 150-160
Author(s):  
T.Y. Yang ◽  
T.S. Ge ◽  
F.L. Lu ◽  
Y.J. Dai ◽  
R.Z. Wang
Keyword(s):  
Heat Pump ◽  
Simulation Study ◽  
Pump System ◽  
Heat Pump System ◽  
System Part

Optimization of Working Ground Heat Storage With Seasonal Regeneration

2006 ◽  
Author(s):  
Pawel Olszewski
Keyword(s):  
Energy Storage ◽  
Heat Exchange ◽  
Heat Pump ◽  
Input Data ◽  
Heat Storage ◽  
Target Function ◽  
Working Fluid ◽  
Solar Collectors ◽  
Pump System ◽  
Heat Pump System

The aim of the research was an optimization of long-term heat storage with seasonal regeneration. Energy consumption for central heating during wintertime, transfererred from ground energy storage using a heat exchange device, is the operating principle of such systems. Warmed working fluid is then used in a heat pump system. However, more accurate calculations showed that over time of usage, there is a trend toward cooling at deeper round layers. Such a situation leads to a lowering of ground potential when using heat pump systems. A possible solution to this problem is the application of summer regeneration: during summer months, the working fluid is firstly warmed in solar collectors, and then forced into the same boreholes. The numerical model of a vertical, ground heat exchange device (configured as a "pipe in pipe", known as a Fields' pipe) was specially developed. Temperature distribution of the working fluid along the pipe was one of the boundary conditions, for the co-axial, time-variable, heat conduction task, which described the heat flow in energy storage. The numerical simulation of solar collectors work was based on the Hottel - Whillier - Bliss equation, in which energy flow from the solar collector is calculated, dependant on external parameters such as: insulation or ambience temperature. The combination of three computational parts- the ground heat exchange device, energy storage area and solar collectors battery- allows the target function to be defined for task optimization. The subject of optimization was an energy quantity, which can be taken from energy underground storage, and then utilized by the heat pump system. In the summarized paper, a combination of the input data, which influenced the efficiency of energy storage, was chosen. Hypothetical data were: outside diameter and length of heat exchange device, distance between pipes, fluid flow through the pipe during charge and discharge processes or temperature of inlet working fluid. The influence of individual parameters on the target function, holding all input data constant, was analyzed. A developed evolutionary numerical code known as GENOCOP I (GEnetic algorithm for Numerical Optimization for COnstrained Problems) [3] was used for optimization. After preliminary correction of boundary values of the input data, nine attempts of optimization were taken up. The research results identified optimal values of input parameters for which maximum energy could be taken from ground storage.

A TRNSYS/GROCS Simulation of the TECH House I Ground-Coupled Series Solar-Assisted Heat Pump System

1983 ◽  
Vol 105 (4) ◽  
pp. 446-453 ◽  
Author(s):  
D. J. Roeder ◽  
R. L. Reid
Keyword(s):  
Heat Pump ◽  
Storage Tank ◽  
Heating System ◽  
Electric Resistance ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Seasonal Performance ◽  
The University ◽  
Better Than

The series solar-assisted heat pump heating system with ground-coupled storage in The University of Tennessee’s TECH House I in Knoxville, Tennessee, has been modeled using TRNSYS/GROCS and was compared to the experimental performance for the 1980–81 heating season. The simulation results were within 8 percent of the experimental measurements. Both simulation and experimental results showed that ground coupling of thermal storage led to the elimination of electric resistance backup heat and a large reduction in the peak heating demand of the house. Results of a parametric study showed that, in general, a ground-coupled storage tank performs better than a storage tank placed outdoors in the Knoxville area. Application of a next generation heat pump resulted in the most significant impact on the seasonal performance factor. As expected, higher performance collectors and larger collector areas led to higher system seasonal performance. An economic analysis showed that the series solar heat pump system cannot economically compete with the stand-alone heat pump system in the Knoxville area.

Simulation Study on Solar Collector - Air Source Heat Pump Combined System for Space Heating in Cold Region

2012 ◽  
Vol 238 ◽  
pp. 478-481
Author(s):  
Zhen Qing Wang ◽  
Yan Chen ◽  
Hai Xia Wang
Keyword(s):  
Heat Pump ◽  
Simulation Study ◽  
Hot Water ◽  
Office Building ◽  
Space Heating ◽  
Combined System ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
Air Source Heat Pump

An air source heat pump system (ASHPS) was set up, which provided space heating and cooling, as well as hot water for an office building in Tianjin. Its operating performance in winter was evaluated based on test data. Considering the local abundant solar radiation and the way to provide energy in an office building, a simulation study was carried out on the combsystem of ASHP and flat plate air collector (FPAC). The effects of collector area and its outlet parameters on the heating performance of ASHP were studied, and the favorable operating and matching mode were recommended. The results indicate that ASHPS is a technically viable method in Tianjin in winter, but not economically, and the air-solar combsystem should be taken into account for its massive replacement for conventional energy.

Experimental and simulation study on the plate absorber for hybrid heat pump system

2013 ◽  
Vol 27 (12) ◽  
pp. 3903-3909 ◽  
Author(s):  
Seung Sun An ◽  
Chung Woo Jung ◽  
Minsung Kim ◽  
Seong Ryong Park ◽  
Chaedong Kang ◽  
...  
Keyword(s):  
Heat Pump ◽  
Simulation Study ◽  
Pump System ◽  
Heat Pump System ◽  
Hybrid Heat Pump ◽  
Plate Absorber
Sign in / Sign up

Export Citation Format

Share Document