Modeling of a Wellhead Heating Methodology With Heat Pipes in Coal Mines

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Hongyang Zhang ◽  
Kewen Li ◽  
Lipeng Zhao ◽  
Lin Jia ◽  
Mohammed Kaita ◽  
...  
Keyword(s):  
Heat Pipe ◽  
New Technologies ◽  
Low Cost ◽  
Coal Mines ◽  
Heat Pipes ◽  
Heating System ◽  
Heat Pumps ◽  
Hot Water ◽  
Winter Period ◽  
Ground Source Heat Pumps

Abstract Many coal mines are located at the middle and high latitudes. In winter, coal mining facilities may be operated under the freezing conditions. Burning coal for hot water is usually used to heat up the facilities, which is not environmentally friendly and energy efficient. Currently, the ground source heat pumps and other new technologies have been applied for heating in coal mines and have achieved some success. However, the working characteristics and costs of these technologies are not suitable for the antifreeze at the wellhead. Heat pipe technology has the following advantages: automatic operation with the change of atmosphere temperature (AMT) and low cost of construction and maintenance, which can overcome the drawbacks of the aforementioned technologies. In this article, a heating system based on heat pipe technology has been designed and modeled. The system extracts heat from the shallow normal temperature zone (NTZ) to automatically heat the coal wellhead in winter. For the heating system, the effects of AMT, the temperature of NTZ, the frozen zone thickness (FZT), the thermal conductivity, and the heat pipe quantity (HPQ) on the heating performance have been modeled and investigated using comsol multiphysics. The modeling results have been analyzed and discussed. The modeling data showed that the system based on heat pipes could meet the antifreeze requirements for the designed system during the winter period. The wellhead heating system proposed in this article may achieve the purpose of replacing fossil energy with shallow geothermal energy.

Development of a Passive Cooling Panel for Residential Buildings, Integrated Into a Novel “Magnetic/PCM” Ground Coupled Flat Heat Pipe

2008 ◽  
Author(s):  
Gustavo Gutierrez ◽  
Josean Aponte
Keyword(s):  
Heat Pipe ◽  
Residential Buildings ◽  
Low Cost ◽  
Heat Pumps ◽  
Design Parameters ◽  
Working Fluid ◽  
Passive Cooling ◽  
Ground Source Heat Pumps ◽  
Reluctance Motor ◽  
Flat Heat Pipe

New perspectives for reducing heat and electricity consumption in building are emerging with innovative techniques such as highly insulating glazing and super insulated structures, utilization of solar energy, solar cells, hybrid ventilation solutions, energy efficient and demand-controlled ventilation, as well as integration of solutions, energy production in building. A relatively new innovation is the use of ground-source heat pumps that have become popular for both residential and commercial heating and cooling applications because of their higher energy efficiency compared to conventional systems. In this study, a flat heat pipe is proposed for using the enormous heat capacity of the soil as a heat sink to remove heat from the ambient, integrated the principal idea of a linear reluctance motor for the recirculation of the working fluid. Linear oscillating motors have a long history as rotary motors; but the complexity in the design and difficulties on their control limited the use of them. The motor consists of an iron bar, moving inside a coil. During the path of the iron bar an incremental force appears opposing the movement of the bar. For that reason, it is important to control the system and take advantage of that behavior. Reluctance motors can have high power density at a low cost, making them ideal for many applications. In this study, an implementation of the reluctance motor is proposed for using in a recirculation process of a passive cooling panel for residential buildings. Parametric studies are carried out to optimize the design parameters.

Evacuated Tube Heat Pipe Solar Collectors Applied to Recirculation Loop in a Federal Building: SSA Philadelphia

Solar Energy ◽  
2004 ◽  
Author(s):  
Andy Walker ◽  
Fariborz Mahjouri ◽  
Robert Stiteler
Keyword(s):  
Solar Energy ◽  
Heat Pipe ◽  
Heat Loss ◽  
Heating System ◽  
Hot Water ◽  
Solar Array ◽  
Solar Collectors ◽  
Water Heating ◽  
Evacuated Tube ◽  
Recirculation Loop

This paper describes design, simulation, construction and measured initial performance of a solar water heating system (360 Evacuated Heat-Pipe Collector tubes, 54 m2 gross area, 36 m2 net absorber area) installed at the top of the hot water recirculation loop in the Social Security Mid-Atlantic Center in Philadelphia. Water returning to the hot water storage tank is heated by the solar array when solar energy is available. This new approach, as opposed to the more conventional approach of preheating incoming water, is made possible by the thermal diode effect of heat pipes and low heat loss from evacuated tube solar collectors. The simplicity of this approach and its low installation costs makes the deployment of solar energy in existing commercial buildings more attractive, especially where the roof is far removed from the water heating system, which is often in the basement. Initial observed performance of the system is reported. Hourly simulation estimates annual energy delivery of 111 GJ/year of solar heat and that the annual efficiency (based on the 54 m2 gross area) of the solar collectors is 41%, and that of the entire system including parasitic pump power, heat loss due to freeze protection, and heat loss from connecting piping is 34%. Annual average collector efficiency based on a net aperture area of 36 m2 is 61.5% according to the hourly simulation.

scholarly journals The Co-Construction of Energy Provision and Everyday Practice: Integrating Heat Pumps in Social Housing in England

2015 ◽  
Vol 28 (3) ◽  
pp. 26-53 ◽  
Author(s):  
Ellis P Judson ◽  
Sandra Bell ◽  
Harriet Bulkeley ◽  
Gareth Powells ◽  
Stephen Lyon
Keyword(s):  
Large Scale ◽  
New Technologies ◽  
Heat Pumps ◽  
Consumer Information ◽  
Hot Water ◽  
Everyday Practice ◽  
Full Potential ◽  
Low Carbon ◽  
Energy Services ◽  
The North

Challenges of energy security, low carbon transitions, and electricity network constraints have led to a shift to new, efficient technologies for household energy services. Studies of such technological innovations usually focus on consumer information and changes in behaviour to realise their full potential. We suggest that regarding such technologies in existing energy provision systems opens up questions concerning how and why such interventions are delivered. We argue that we must understand the ways by which energy systems are co-constituted through the habits and expectations of households, their technologies and appliances, alongside arrangements associated with large-scale socio-technical infrastructures. Drawing on research with air-source-to-water heat pumps (ASWHP), installed as part of a large trans-disciplinary, utility-led research and demonstration project in the north of England, we investigate how energy services provision and everyday practice shapes new technologies uptake, and how such technologies mediate and reconfigure relations between users, providers and infrastructure networks. While the installation of ASWHP has led to role differentiation through which energy services are provided, the space for new forms of co-provision to emerge is limited by existing commitments to delivering energy services. Simultaneously, new forms of interdependency emerge between users, providers and intermediaries through sites of installation, instruction, repair and feedback. We find that although new technologies do lead to the rearrangement of practices, this is often disrupted by obduracy in the conventions and habits around domestic heating and hot water practices that have been established in relation to existing systems of provision. Rather being simply a matter of increasing levels of knowledge in order to ensure that such technologies are adopted effi ciently and effectively, our paper demonstrates how systemic arrangements of energy provision and everyday practice are co-implicated in socio-technical innovation by changing the nature of energy supply and use.

scholarly journals Ground Source Heat Pumps: Considerations for Large Facilities in Massachusetts

2020 ◽  
Author(s):  
Eric Wagner ◽  
Benjamin McDaniel ◽  
Dragoljub Kosanovic
Keyword(s):  
Co2 Emissions ◽  
Current System ◽  
Cost Benefit ◽  
Heating System ◽  
Heat Pumps ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Ground Source ◽  
Industry Standards ◽  
Conventional Cooling

Ground-source heat pump (GSHP) systems have been implemented at large scales on several university campuses to provide heating and cooling. In this study, we test the idea that a GSHP system, as a replacement for an existing Combined Heat and Power (CHP) heating system coupled with conventional cooling systems, could reduce CO2 emissions, and provide a cost benefit to a university campus. We use the existing recorded annual heating and cooling loads supplied by the current system and an established technique of modeling the heat pumps and borehole heat exchangers (BHEs) using a TRNSYS model. The GSHP system is modeled to follow the parameters of industry standards and sized to provide an optimal balance of capital and operating costs. Results show that despite a decrease in heating and cooling energy usage and CO2 emissions are achieved, a significant increase in electric demand and purchased electricity result in an overall cost increase. These results highlight the need for thermal energy storage, onsite distributed energy resources and/or demand response in cases where electric heat pumps are used to help mitigate electric demand during peak periods.

scholarly journals Design and Implementation of a Parabolic Cylinder Collector with Solar Tracking to obtain hot water

2018 ◽  
Vol 57 ◽  
pp. 02003 ◽  
Author(s):  
Wilson E. Sánchez ◽  
Mario P. Jiménez ◽  
Carlos A. Mantilla ◽  
José M. Toro ◽  
Miguel A. Villa ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Tracking System ◽  
Heating System ◽  
Hot Water ◽  
Parabolic Cylinder ◽  
Charging System ◽  
Design And Implementation ◽  
Solar Tracking ◽  
Deflection Analysis ◽  
Solar Tracker

This investigation describes the design and implementation of a parabolic trough solar collector (PCC) with solar tracking to obtain hot water. The solar radiation available at the installation site is analyzed, followed by the design and construction of the mechanical system, making a series of calculations for the dimensioning of the reflective base, and a stress and deflection analysis of the structure is performed to verify the feasibility of the design in the ANSYS software. An analysis of the solar tracking system is performed, which is dimensioned from the PCC structure to determine the type of solar tracker to implement; The charging system, consisting of a solar panel and a battery, is dimensioned for the power supply of the tracking system; as a last point, for the heating system is determined the amount of water that is able to heat the system from the energy analysis at the installation site, the heating system is based on placing a Heat Pipe, in the focus of the parabola to receive the solar rays reflected by the collector and heat exchange to the water from a thermowell where the heat pipe condenser enters, finally tests are carried out in the PCC implemented obtaining a global efficiency of 16.37%.

scholarly journals Installation and Operation of a Solar Cooling and Heating System Incorporated with Air-Source Heat Pumps

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 996 ◽  
Author(s):  
Li Huang ◽  
Rongyue Zheng ◽  
Udo Piontek
Keyword(s):  
Heating System ◽  
Cooling Capacity ◽  
Heat Pumps ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Energy Yield ◽  
Absorption Chiller ◽  
Annual Average ◽  
Water Storage Tank ◽  
Solar Cooling

A solar cooling and heating system incorporated with two air-source heat pumps was installed in Ningbo City, China and has been operating since 2018. It is composed of 40 evacuated tube modules with a total aperture area of 120 m2, a single-stage and LiBr–water-based absorption chiller with a cooling capacity of 35 kW, a cooling tower, a hot water storage tank, a buffer tank, and two air-source heat pumps, each with a rated cooling capacity of 23.8 kW and heating capacity of 33 kW as the auxiliary system. This paper presents the operational results and performance evaluation of the system during the summer cooling and winter heatingperiod, as well as on a typical summer day in 2018. It was found that the collector field yield and cooling energy yield increased by more than 40% when the solar cooling and heating system is incorporated with heat pumps. The annual average collector efficiency was 44% for cooling and 42% for heating, and the average coefficient of performance (COP) of the absorption chiller ranged between 0.68 and 0.76. The annual average solar fraction reached 56.6% for cooling and 62.5% for heating respectively. The yearly electricity savings accounted for 41.1% of the total electricity consumption for building cooling and heating.

scholarly journals An Analysis of Solar Heating System Assisted by Ground-source Heat Pumps in Office Building

2015 ◽  
Vol 121 ◽  
pp. 1406-1412 ◽  
Author(s):  
Zhigang Wang ◽  
Daxing Huang ◽  
Pan Wang ◽  
Qiang Shen ◽  
Qingnan Zhang ◽  
...  
Keyword(s):  
Heating System ◽  
Heat Pumps ◽  
Solar Heating ◽  
Office Building ◽  
Ground Source Heat Pumps ◽  
Ground Source

Experimental Research on a Novel Solar Water Heating System by Using Loop Heat Pipe

2013 ◽  
Vol 724-725 ◽  
pp. 163-170
Author(s):  
Zhang Yuan Wang ◽  
Xiang Mei Zhang ◽  
Wan Sheng Yang ◽  
Zhi Wu Chen
Keyword(s):  
Heat Pipe ◽  
High Efficiency ◽  
Heating System ◽  
Hot Water ◽  
Loop Heat Pipe ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Evacuated Tubes ◽  
Solar Water Heating System

In this paper, a novel solar water heating system will be proposed by applying the loop heat pipe to a conventional split solar hot water system, which will have the characteristics of high efficiency, low cost, appearance appealing and building integration. Three types of the system, i.e., the system with evacuated tubes, with single flat-plate glazing cover, and without glazing, will be experimentally investigated and compared on the influence to the dynamic performance of the system. It was found that the system’s operating temperature increased significantly during the start-up stage and gently after until reach relatively constant. The instantaneous efficiency was found to be fluctuated, although it reached stable eventually during the operations for all three types. By using the moving average calculating method, every 10 minutes were applied for the calculation of the average efficiency which had a negative linear relation with the combined factor of (Tmean-Tamb)/I. In general, the solar system with evacuated tubes performed the best with the highest water temperature output, highest system efficiency and lowest heat loss coefficient among the three systems.

scholarly journals Clean Energy for Cooling and Heating with Ground Source Heat Pumps

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Heat Pumps ◽  
Hot Water ◽  
Energy Sources ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Ground Source

In the recent attempts to stimulate alternative energy sources for heating and cooling of buildings, emphasise has been put on utilisation of the ambient energy from ground source heat pump systems (GSHPs) and other renewable energy sources. Exploitation of renewable energy sources and particularly ground heat in buildings can significantly contribute towards reducing dependency on fossil fuels. The study was carried out at the Energy Research Institute (ERI), between September 2016 and November 2017. This paper highlights the potential energy saving that could be achieved through use of ground energy source. The main concept of this technology is that it uses the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The purpose of this study, however, is to examine the means of reducing of energy consumption in buildings, identifying GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promoting the use of GSHPs applications as an optimum means of heating and cooling, and presenting typical applications and recent advances of the DX GSHPs. It is concluded that the direct expansion of GSHP are extendable to more comprehensive applications combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors. This study highlights the energy problem and the possible saving that can be achieved through the use of the GSHP systems. This article discusses the principle of the ground source energy, varieties of GSHPs, and various developments.

scholarly journals Ways to heat hot water via the heat pipes

2018 ◽  
Vol 168 ◽  
pp. 09003
Author(s):  
Peter Hrabovský ◽  
Zuzana Kolková ◽  
Jozef Matušov ◽  
Patrik Nemec
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Nuclear Power ◽  
Heat Pipes ◽  
Hot Water ◽  
Temperature Range ◽  
Thermal Output ◽  
Actual Use ◽  
Mechanical Elements ◽  
The Way

The article deals various ways of heating hot water where heat is transferred by the basic phenomena of heat transfer theories, which take place on an innovative basis with the advantage of the absence of mechanical elements. The heat transfer in this case ensures a change in the phase-in phase of the working substance – the fluid – from which the thermal output and the efficiency of the device are derived. The devices described in this article work on the same principle of heat transfer. Each device is characterized by own construction and the principle of heat transfer. Heat pipes are classified according to the way of operation and the place of use. Subdivision of the heat pipe, in terms of its actual, use in the desired temperature range. At present, heating plants use cooling technologies (nuclear power, space stations, IT).

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