Heat pumps and heat pipes for applications in cold regions

2007 ◽  
pp. 595-608
Author(s):  
Leonard L. Vasiliev
Keyword(s):  
Heat Pipes ◽  
Heat Pumps ◽  
Cold Regions

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.

Analysis of an Integrated Thermal Energy System for Applications in Cold Regions

2021 ◽  
pp. 1-32
Author(s):  
Bismark Addo-Binney ◽  
Wahid Besada ◽  
Martin Agelin-Chaab
Keyword(s):  
Heat Pump ◽  
Pump Energy ◽  
Energy System ◽  
Heat Pumps ◽  
Environmental Data ◽  
Coefficient Of Performance ◽  
Space Heating ◽  
Cold Regions ◽  
Heating Capacity ◽  
Better Than

Abstract This paper performed analyses on a proposed direct wind-powered heat pump integrated with a pond which serves as an evaporator for space heating in cold regions. The analysis was conducted using environmental data for selected locations in Canada and the Engineering Equation Solver. Three different pairings of heat pumps and wind turbines were studied (a wind-powered heat pump with a pond as an evaporator, a wind-powered heat pump without a pond, and an electricity-powered heat pump). Energy and exergy analyses were performed on the systems. The novelty in the present study is in the use of a wind turbine to directly power the heat pump and using a pond as the evaporator. The results show that the proposed system has the highest coefficient of performance compared to the others. The average coefficient of performance for the selected locations is 2.7, which is at least 67% better than the others. Similarly, the overall exergy for the proposed system is 16.9%, which is at least 40% better than the others. The average heating capacity of the selected locations for the proposed system is 4.5 kW, which is from 29% to 300% better than the others. Additionally, the sustainability index for the proposed system is the highest for the proposed system. The results have shown that the proposed system has superior overall performance for space heating in cold regions.

DEVELOPMENT AND RESEARCH OF HIGH EFFICIENT FANS OF RECUPERATORS FOR DECENTRALIZED INSTALLATION IN RESIDENTIAL COMPLEXES

2017 ◽  
Vol 7 (4) ◽  
pp. 32-37
Author(s):  
Andrey G. MATVEEV
Keyword(s):  
Heat Exchanger ◽  
Heat Pipes ◽  
High Heat ◽  
Heat Pumps ◽  
Heat Conducting ◽  
Ongoing Research ◽  
Effi Ciency ◽  
High Efficient ◽  
Innovative Products

The article deals with the introduction of decentralized fans of recuperators of exhaust air heat, including using high-heat-conducting heat pipes with an intermediate coolant as a heat exchanger. The considered criteria form a comparative basis for the developed designs of heat recuperators for ventilation air in buildings, including heat pipes. The energy and economic effi ciency of such recuperators is analyzed. Areas are singled out where the use of heat recuperators is much more eff ective than increasing the capacity of heat pumps. As a result of ongoing research, cooling or heating modules based on aluminum, aluminum-copper radiators with integrated heat pipes will be developed as innovative products.

A novel integrated heating system of solar energy and air source heat pumps and its optimal working condition range in cold regions

2018 ◽  
Vol 174 ◽  
pp. 922-931 ◽  
Author(s):  
Guodong Qiu ◽  
Xinghua Wei ◽  
Zhenfei Xu ◽  
Weihua Cai
Keyword(s):  
Solar Energy ◽  
Working Condition ◽  
Heating System ◽  
Heat Pumps ◽  
Cold Regions

Field test investigation of a double-stage coupled heat pumps heating system for cold regions

2005 ◽  
Vol 28 (5) ◽  
pp. 672-679 ◽  
Author(s):  
W. Wang ◽  
Z. Ma ◽  
Y. Jiang ◽  
Y. Yang ◽  
S. Xu ◽  
...  
Keyword(s):  
Field Test ◽  
Heating System ◽  
Heat Pumps ◽  
Cold Regions ◽  
Test Investigation

Development and Research of Phase-Transition and Thermochemical Materials for Heat Accumulation

2020 ◽  
pp. 1-26 ◽  
Author(s):  
Baba Dzhabrailovich Babaev ◽  
Valeriy Vladimirovich Kharchenko ◽  
Vladimir Panchenko
Keyword(s):  
Phase Transition ◽  
Energy Storage ◽  
Computer Program ◽  
Heat Supply ◽  
Heat Pipes ◽  
Heat Pumps ◽  
Photochemical Reactions ◽  
Multicomponent Systems ◽  
Heat Accumulation ◽  
Transition Heat

The chapter discusses various phase-transition heat-accumulating materials. Their application in heat pumps and their use for heat supply are presented. Phase-transition heat-accumulating materials in heat pipes are also considered, various types of heat pipes are presented. The installation of heat storage with phase-transition materials is presented. Along with phase-transition heat-accumulating materials, the chapter considers thermochemical heat-accumulating material of photochemical reactions of energy storage. As an example of a thermochemical heat-accumulating material, a solar power plant for thermochemical energy storage is presented. A developed computer program for the description of thermochemical reactions allows examining chemical and thermochemical reactions in multicomponent reciprocal systems, which can be carried out in the course of the reciprocal multicomponent systems. The computer program allows identifying thermochemical reactions occurring in mutual multicomponent systems, regardless of component and dependent on temperature.

An overview of the problems and solutions of soil thermal imbalance of ground-coupled heat pumps in cold regions

2016 ◽  
Vol 177 ◽  
pp. 515-536 ◽  
Author(s):  
Tian You ◽  
Wei Wu ◽  
Wenxing Shi ◽  
Baolong Wang ◽  
Xianting Li
Keyword(s):  
Heat Pumps ◽  
Cold Regions ◽  
Ground Coupled Heat Pumps ◽  
Problems And Solutions ◽  
Thermal Imbalance

scholarly journals Experimental and Numerical Results on the Performance of a Heat Pump

2019 ◽  
Vol 9 (1) ◽  
pp. 7289-7299
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Pumps ◽  
Cost Comparison ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
Frozen Ground ◽  
Pump System ◽  
Cold Regions ◽  
Heating Oil

A 21 kW ground source heat pump (GSHP) operating since 2013 in Alaska is described in this paper. Six years of successful operation in an extreme climate and measured performance data from 2013 to 2017 prove the viability of heat pumps for extreme cold regions. Summary of performance evaluation data such as monthly electric energy use and cost, savings of the heat pump system compared to the cost of heating oil, energy extracted from the ground, heat delivered to building are tabulated by months. The coefficient of performance (COP) of the heat pump is calculated from the experimental data, which show the COP to vary from a maximum value of 4.15 to a minimum value of 2.34 depending on the heating load of the month and the ground temperature. Cost comparison shows savings by heat pump over regular heating oil boilers of 80% efficiency. In cold regions it is of concern that GSHP can create frozen ground or permafrost around the ground heat exchanger coil by extracting too much heat from the ground. A finite element heat conduction simulation performed over the ground heat exchanger coil spanning over a 30-year period shows that small volumes of frozen ground form around the coil each season, but they melt away during the summer by the recharge of heat from the solar heat gain. The mechanical system of the heat pump, sensors for measurements and cost of the system components are presented, which would be valuable to designers implementing heat pumps in various locations of the world.

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