Analysis of Substation Energy Savings by Applying CVR in a Radial Unbalanced Distribution Feeder with Photovoltaic System

In the last years, the EU and scientific community put a lot of effort in trying to increase the sustainability in renovated buildings by introducing novel concepts and technologies. This paper presents the outcomes of a retrofit case study carried out within the Heat4Cool H2020 project concerning space heating (SH) and domestic hot water (DHW) systems. The case study is a multi-family residential building located in Chorzow, Poland, where the SH and DHW are provided by natural gas boilers present in each apartment. The proposed approach is to combine the existing gas boilers with phase change material storages (PCM) and a direct current air source heat pump (DC-EHP) assisted by a photovoltaic system (PV) connected to the grid. TRNSYS was used for the dynamic simulations, and to support the introduction of the retrofit layout. New custom TRNSYS’ types were developed for each technology and tested against experimental data provided by industrial partners. Furthermore, a state-of-the-art rule-based controller was developed combining TRNSYS with a MATLAB’s script and tested against an interior point optimal control algorithm. In the best-case scenario the yearly primary energy savings are more than 30% accounting for the PV energy sold to the grid and around 11% considering only self-consumption, while the pay-back time is around 10 years considering EU28 economic conditions and 20% overall discount for the renovation project.

Download Full-text

Voltage reduction due to reverse power flow in distribution feeder with photovoltaic system

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2019.05.059 ◽

2019 ◽

Vol 113 ◽

pp. 411-418 ◽

Cited By ~ 5

Author(s):

Daisuke Iioka ◽

Takahiro Fujii ◽

Dai Orihara ◽

Toshio Tanaka ◽

Tsuyoshi Harimoto ◽

...

Keyword(s):

Power Flow ◽

Photovoltaic System ◽

Distribution Feeder

Download Full-text

Zero Energy Building Economic and Energetic Assessment with Simulated and Real Data Using Photovoltaics and Water Flow Glazing

Energies ◽

10.3390/en14113272 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3272

Author(s):

Fernando del Ama Gonzalo ◽

Belen Moreno Santamaria ◽

José Antonio Ferrándiz Gea ◽

Matthew Griffin ◽

Juan A. Hernandez Ramos

Keyword(s):

Water Flow ◽

Energy Savings ◽

Real Data ◽

Primary Energy ◽

Simulation Software ◽

Photovoltaic System ◽

Zero Energy ◽

New Paradigm ◽

Photovoltaic Array ◽

Yield Factor

The new paradigm of Net Zero Energy buildings is a challenge for architects and engineers, especially in buildings with large glazing areas. Water Flow Glazing (WFG) is a dynamic façade technology shown to reduce heating and cooling loads for buildings significantly. Photovoltaic panels placed on building roofs can generate enough electricity from solar energy without generating greenhouse gases in operation or taking up other building footprints. This paper investigates the techno-economic viability of a grid-connected solar photovoltaic system combined with water flow glazing. An accurate assessment of the economic and energetic feasibility is carried out through simulation software and on-site tests on an actual prototype. The assessment also includes the analysis of global warming potential reduction. A prototype with WFG envelope has been tested. The WFG prototype actual data reported primary energy savings of 62% and 60% CO2 equivalent emission reduction when comparing WFG to a reference triple glazing. Finally, an economic report of the Photovoltaic array showed the Yield Factor and the Levelized Cost of Energy of the system. Savings over the operating lifetime can compensate for the high initial investment that these two technologies require.

Download Full-text

Copenhagen Agreement - A New Paradigm of Climate Problem Solving

Voprosy Ekonomiki ◽

10.32609/0042-8736-2010-9-115-132 ◽

2010 ◽

pp. 115-132 ◽

Cited By ~ 1

Author(s):

S. Agibalov ◽

A. Kokorin

Keyword(s):

Climate Change ◽

Energy Savings ◽

Global Climate ◽

Climate Change Policy ◽

New Order ◽

Paradigm Shifts ◽

New Paradigm ◽

Energy Efficiency Policy ◽

Policy Paradigm ◽

Change Policy

Copenhagen summit results could be called a failure. This is the failure of UN climate change policy management, but definitely the first step to a new order as well. The article reviews main characteristics of climate policy paradigm shifts. Russian interests in climate change policy and main threats are analyzed. Successful development and implementation of energy savings and energy efficiency policy are necessary and would sufficiently help solving the global climate change problem.

Download Full-text

Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1

TAPPI Journal ◽

10.32964/tj10.5.21 ◽

2011 ◽

Vol 10 (5) ◽

pp. 21-28 ◽

Cited By ~ 13

Author(s):

CARL HOUTMAN ◽

ERIC HORN

Keyword(s):

Oxalic Acid ◽

Energy Savings ◽

Wood Chip ◽

Strength Properties ◽

Thermomechanical Pulp ◽

Sugar Solution ◽

Bisulfite Treatment ◽

Pilot Trials ◽

Pulp Production ◽

Production Part

Pilot data indicate that wood chip pretreatment with oxalic acid reduced the specific energy required to make thermomechanical pulp. A combined oxalic acid/bisulfite treatment resulted in 21% refiner energy savings and 13% increase in brightness for aspen. A low level of oxalic acid treatment was effective for spruce. Energy savings of 30% was observed with no significant change in strength properties. Adding bisulfite did not significantly increase the brightness of the spruce pulp. For pine, the optimum treatment was a moderate level of oxalic acid, which resulted in 34% energy savings and an increase in strength properties. For all of these treatments 1–3 w/w % carbohydrates were recovered, which can be fermented to produce ethanol. The extract sugar solution contained significant quantities of arabinose.

Download Full-text