A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates

Hakkaki-Fard, Ali; Eslami-Nejad, Parham; Aidoun, Zine; Ouzzane, Mohamed

doi:10.1016/j.energy.2015.04.093

Cited by 90 publications

(23 citation statements)

References 20 publications

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“…For this purpose, the present value of the fuel cost is used. Therefore, the life-cycle cost (LCC) can be calculated by the following equations, which is considered for a 30-year period [34,35].…”

Section: Life Cycle Cost (Lcc)mentioning

confidence: 99%

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

2019

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High mountains and cold climate in the north-west of Iran are critical factors for the design of optimized District Heating (DH) systems and energy-efficient buildings. It is essential to consider the Life Cycle Cost (LCC) that includes all costs, such as initial investment and operating costs, for designing an optimum DH system. Moreover, considering climate change for accurately predicting the required heating load is also necessary. In this research, a general optimization is carried out for the first time with the aim of a new design concept of a DH system according to a LCC, while considering all-involved parameters. This optimized design is based on various parameters such as ceiling and wall insulation thicknesses, depth of buried water and heating supply pipes, pipe insulation thickness, and boiler outlet temperature. In order to consider the future weather projection, the mentioned parameters are compared with and without climate change effects in a thirty-year period. The location selection was based on the potential of the region for such a system together with the harsh condition of the area to transport the common fossil fuel to the residential buildings. The obtained results show that insulation of walls is more thermally efficient than a roof with the same area in the selected case. In this case, polyurethane is the best material, which can cause a reduction of 59% in the heating load and, consequently, 2332 tons of CO2 emission annually. The most and the least investment payback periods are associated with the polyurethane and the glass wool insulation materials with the amounts of seven and one years. For the general optimization of the DH system, the Particle Swarm Optimization (PSO) method with a constriction coefficient was chosen. The results showed that the optimal thickness of the polyurethane layer for the thermal insulation of the building exterior walls is about 14 cm and the optimal outlet temperature of the boiler is about 95 °C. It can be also concluded that the optimal depth for the buried pipes is between 1.5 to 3 m underground. In addition, for the pipe with elastomeric insulation layer, the thickness of 2 cm is the optimal choice.

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Section: Life Cycle Cost (Lcc)mentioning

confidence: 99%

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

2019

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“…Due to the flexibility of structure, by coupling with different terminal devices, heat pump can fulfill different practical demands, such as air conditioning, water heating, and dehumidification [4][5][6][7]. Meanwhile, as heat pump could recover heat from a variety of energy sources, integrating heat pump with renewable energy can bring great energy and cost saving [8,9]. Especially, solar-assisted heat pump (SAHP) has become one of the most prospective techniques with the enhanced performance and minified operating costs [10,11].…”

Section: Introductionmentioning

confidence: 99%

Operation characteristics of a novel dual source multi-functional heat pump system under various working modes

Wang

Huang

2017

Applied Energy

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“…One of the main advantages of geothermal heat pump systems (GHPS) is its high energy performance levels. On average, 40-60% less energy is required compared to conventional Heating, Ventilation and Air Conditioning (HVAC) systems and air-source heat pumps (ASHP) (Hakkaki-Fard, Eslami-Nejad et al 2015). However, the performance of GHPS systems greatly depends on local geological characteristics.…”

Section: Introductionmentioning

confidence: 99%

Predicting the thermal behaviour of sands considering its moisture content and grain size with applications to geothermal heat pump installations

Rodríguez

Morillón-Gálvez

Aldama-Ávalos

et al. 2019

Energy and Buildings

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  An experimental thermal study of five different types of sands has been conducted  Fine-grained sands attain higher maximum temperature than coarse-grained sands  Sub-angular and rounded grains with 0-25% moisture could enhance GHPS performance  Derivation of a sand temperature model considering grain size, shape and moisture content  Potential implementation of the derived model in building simulation tools is discussed

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A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates

Cited by 90 publications

References 20 publications

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

Operation characteristics of a novel dual source multi-functional heat pump system under various working modes

Predicting the thermal behaviour of sands considering its moisture content and grain size with applications to geothermal heat pump installations

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