Energy efficient Nordic greenhouse : case : University of Oulu botanical gardens
1University of Oulu, Faculty of Technology, Environmental Engineering
|Online Access:||PDF Full Text (PDF, 4.9 MB)|
|Persistent link:|| http://urn.fi/URN:NBN:fi:oulu-201908022720
Oulu : M. Ahasan,
|Publish Date:|| 2019-08-19
|Thesis type:||Master's thesis (tech)
The human population has grown sevenfold over the past two century, proportionately the food demand increased and the land for cultivation is shrinking. According to the United Nations (UN), the present size of the world population is more than 7.6 billion, and it estimates that this number will exceed 13 billion during the current century, which is a considerable challenge for tackling the future food security for all. In the scarcity of land, to meet the food demand of this enormous population, a contemporary agricultural arrangement is needed. By contrast, to conserve the environment, the use of land and fossil fuel should be limited.
In continuation of this, to meet the future food demands, ‘greenhouse farming’ can be a suitable alternative, notably, in the region where the environmental conditions are not entirely favourable for year-round production.
Greenhouses are widely used to provide a suitable environment in cultivation around the world. Generally, a high amount of energy input is needed to make a favourable condition for the plants’ growth. Moreover, the energy consumption profile is much complex when the site location is in a cold climate. For this reason, an energy-efficient greenhouse is not as simple as anyone guess, whereas various factors, including ventilation, covering material, orientation, lighting system and also energy input are considered as the key elements to ensure energy-efficient environment.
In order to overcome the crisis, photovoltaic (PV) solar energy conversion systems could be considered as the most promising systems to aggregate electricity in a carbon-free environment. However, the PV generation blended with Economic, environmental and sustainability aspects.
This study aims to evaluate all the aspects that can hinder greenhouse efficiency in the Nordic region. For this purpose, a grid-connected solar PV system chosen for two different scenarios. It has observed that every scenario have an adequate individual reason for their feasibility.
For the first scenario, it was found that it can produce 10459.00 kWh electricity with a power rating 127.80 kWp, while second can generates 109771.50 kWh with a power rating 141.30 kWp. It also observed that the PV array could meet 25.25% to 26.51% of annual demand of the University of Oulu Botanical Gardens.
Moreover, payback time found equal for both scenario, while in their lifetime they can can reduce 846.85 tonnes to 889.15 tonnes of carbon emission to the atmosphere.
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