scholarly journals Analysis of Water Temperature of Lake Water Source Heat Pump and Calculation of Lake Water Area

2019 ◽  
Vol 252 ◽  
pp. 052062
Author(s):  
Dawei Chen ◽  
Dengchun Zhang
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Lake Water ◽  
Water Source ◽  
Water Area

scholarly journals Cooling Performance Assessment of a Slinky Closed Loop Lake Water Heat Pump System under the Climate Conditions of Pakistan

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 553 ◽  
Author(s):  
Muhammad Kashif Shahzad ◽  
Mirza Abdullah Rehan ◽  
Muzaffar Ali ◽  
Azeem Mustafa ◽  
Zafar Abbas ◽  
...  
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Lake Water ◽  
Closed Loop ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Experimental Setup ◽  
Pump System ◽  
Climate Conditions ◽  
Heat Pump System

This paper presents an experimental evaluation of a closed loop lake water heat pump (LWHPs) system based on the slinky coiled configuration. Initially, a mathematical model is developed in the Engineering Equation Solver (EES) for the heat pump system and the submerged coils in a lake. System performance is determined for the submerged slinky copper coils under the various operating conditions. Afterwards, parametric analysis is performed considering different influencing parameters, such as the lake water temperature, ambient temperature, and mass flow rate of the circulating fluid at constant lake depth of 4 ft. The experimental setup is developed for 3.51 kW cooling capacity after cooling load calculation for a small room. In the current study, slinky copper coils are used to exchange heat with lake water. The experimental setup is installed in Taxila, Pakistan, and the system’s performance is analyzed during selected days. After experimentation based on hourly and daily operation characteristics, it is observed that the lake water temperature has significant influence on the heat transfer rate between slinky coil and lake water. While the lake water temperature in summer decreases and increases in winter with the depth. The resulted daily average coefficient of performance (COP) of the system is within the range of 3.24–3.46 during the selected days of cooling season. Based on these results, it can be concluded that the LWHP systems can be considered a viable solution for Pakistan having a well-established canal system.

Analysis of Water Heat Pollution of Thermal Discharge in Surface Water Source Heat Pump System

2013 ◽  
Vol 368-370 ◽  
pp. 364-368
Author(s):  
Min Wang ◽  
Yue Jin Yu
Keyword(s):  
Surface Water ◽  
Water Temperature ◽  
Heat Pump ◽  
Preventive Measures ◽  
Water Source ◽  
Heat Pumps ◽  
Thermal Discharge ◽  
Pump System ◽  
Heat Pump System ◽  
Local Water

To comprehensively evaluate surface water source heat pump system, the problem of water heat pollution of thermal discharge in surface water source heat pump system should be seriously considered. This study summarizes the causes and hazards of water heat pollution of surface water source heat pump, explores the characteristics of water heat pollution of lake-source heat pump system, river-source heat pump system and sea-source heat pump system respectively, and proposes several preventive measures for solving the problem. Concludes that surface water heat pumps discharges can change local water temperature, and various types of water bodies have different degree of heat pollution.

Energy Analysis and Optimization of a Water-Loop Heat Pump System

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
Shui Yuan ◽  
Michel Grabon
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Energy Savings ◽  
Water Source ◽  
Energy Performance ◽  
Heat Pumps ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
The Impact

A water-loop heat pump system consists of a set of water-source heat pumps that are connected with a closed-loop water network, which allows heat to be injected into or extracted out of the loop water. Such a configuration is able to meet simultaneous heating and cooling demands with a heat recovery capability. This paper analyzes the impact of loop water temperature on energy performance of individual heat pumps and the whole system, demonstrates that there exists a unique loop water temperature that minimizes overall power consumption of the configuration under discussion, and proposes a strategy to find the optimal temperature, which can be implemented in a real-time application. Simulations have been conducted to verify that a significant energy savings can be achieved over conventional practice.

Heat Pump Heating Systems Combined with Solar Energy and Lake Water Source for the Biogas Digester

2013 ◽  
Vol 291-294 ◽  
pp. 1684-1689 ◽  
Author(s):  
Hui Xian Shi ◽  
Kai Xu ◽  
Tao Lv
Keyword(s):  
Solar Energy ◽  
Heat Pump ◽  
Lake Water ◽  
Operating Cost ◽  
Water Source ◽  
Heating System ◽  
Pump Mode ◽  
Annual Operating Cost ◽  
Power Mode ◽  
Suitable Area

A heating system combined with solar energy and lake water source heat pump was designed for 200m3 fermentation reactor．In it could be switched to solar energy power mode, solar power with lake water source heat pump mode and lake water source heat pump mode according to different conditions. Compared with coal fired boiler, initial investment is a little higher, but for annual operating cost , this heating system is only 50% of coal fired boiler’s. But in the next several years, the initial investment can be returned back. For energy saving and economic, it is a suitable heat source for the biogas engineering in suitable area.

Analysis of the Water Intake Technology of Open-Lakes Water Source Heat Pump System in Chongqing

2011 ◽  
Vol 250-253 ◽  
pp. 3168-3172
Author(s):  
Gong Duan Fan ◽  
Zhi Zhang ◽  
Jing Luo ◽  
Xin Wan ◽  
Chao Liu
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
Heat Pump ◽  
Water Intake ◽  
Lower Layer ◽  
Water Source ◽  
Pump System ◽  
Heat Pump System ◽  
Distribution Features ◽  
Lakes And Reservoirs

To research the suitable water intake technology of open-lakes Water Source Heat Pump system (WSHPs) in Chongqing, water temperature, water quality and other water features of lake and reservoir are analyzed. Results show that the temperature of water source in Chongqing’s lakes and reservoirs excelled the air temperature, and the water quality basically meets the requirements of open-lakes WSHPs. Thus the water source in Chongqing’s lakes and reservoirs is a hot and cold source of good quality. For depth of water is greater than 6m, there is an obvious vertical stratification of water temperature in summer, which is not obvious in winter. pH value, turbidity and algal density also have obvious characteristics in vertical distribution, while hardness and salinity have little characteristics. According to the spatial and temporal distribution features of water temperature and water quality, water intake head should be installed in the middle and lower layer of the lake. Less investment and water head loss, lower operation and maintenance costs, and higher reliability should be considered when we choose the way of water intake for WSHPs in Chongqing. Water intake ways such as pump truck water intake, pontoon intake, gravity pipe intake, integrated device are alternative. Comparison between technical and economic should be made first.

Optimal Supply Water Temperature Control of Water Source Heat Pump

Solar Energy ◽  
2005 ◽  
Author(s):  
M. Palahanska-Mavrov ◽  
G. Wang ◽  
M. Liu
Keyword(s):  
Potential Energy ◽  
Water Temperature ◽  
Heat Pump ◽  
Temperature Control ◽  
Energy Cost ◽  
Energy Savings ◽  
Water Source ◽  
Theoretical Models ◽  
The Impact ◽  
Supply Water

The water loop supply water temperature is the most critical control parameter for operating energy cost in water source heat pump systems. In this paper, the impact of the water loop temperature on operating energy cost is investigated for different types of buildings under different loads using theoretical models. The theoretical models and approaches are also applied to an 80,000 square feet office building to determine the building heating and cooling load, optimal supply water temperature, and potential energy cost savings based on measured supply water temperature and loop heat gain. It is concluded that the optimal supply water temperature control can significantly reduce the annual energy costs associated with compressor power and boiler energy. The potential energy savings is determined to be 24% in the application building.

Experimental Study and Application Analysis on Ground-Water Source Heat Pump In North China

Solar Energy ◽  
2006 ◽  
Author(s):  
Zhun Yu ◽  
Youyin Jing ◽  
Yingbai Xie ◽  
Xutao Zhang
Keyword(s):  
Ground Water ◽  
Water Temperature ◽  
Heat Pump ◽  
Heat Load ◽  
North China ◽  
Water Source ◽  
Coefficient Of Performance ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Water

To describe the economical performance and operational characteristic of ground-water source heat pump system (GWSHPS) in North China, GWSHPS was compared with traditional central air-conditioning system (TCACS) for their total investments based upon a GWSHPS demonstration project in Beijing (88000 m2 covered area, 4572 kW heat exchange amount). At the same period, an experimental system of GWSHPS in Hebei was investigated with its operational data such as coefficient of performance (COP). The results of the demonstration project showed that the total investment for GWSHPS was 15.2% lower than TCACS, while annual operating cost for GWSHPS was 42.2% lower than TCACS. The test data of the system in Hebei showed that heating coefficient of performance of the heat pump and primary energy ratio (PER) were raised while heating water temperature was decreased. The entering water temperature to the unit ranged from 13.1°C to 17.4°C, with an average value of 15 °C, the heating water temperature varied from 40°C to 50°C, with the standard work condition of 45°C. The COPHP was about 4.12 at the minimum of heating water temperature, while it was about 3.47 at the maximum of heating water temperature and fluctuated between these values in other temperature. The results of the present work implies that GWSHPS is favorable for North China. However, buildings in North China have high heat load in winter, consequently, GWSHPS designed upon heat load will cause a waste in summer, thus, the solar-assisted ground-water source heat pump system (SAGWSHPS) which combines heat pump with solar water heater can be suggested as the best solution in North China.

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