Fig 6 - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Content may be subject to copyright.
Source publication
The national priority axis is increase of renewables (RES) use in Latvian Energy sector; therefore, new solutions for Electricity, Heat and Cold production are sought for. Solar energy is available at the same time when there is need to cool rooms, so Solar Cooling systems are suitable also for Latvian conditions. In Latvia such systems are not use...
Context in source publication
Citations
... The total coefficient of performance (COP) of the existing solar cooling system was close to 4.8, and during the year it varies from 4.6 to 4.9 by month [15]. Using the PCM storage tank, COP on average increased by about 3 % compared COP of SCS without the PCM storage tank. ...
... Ghafoor and Fracastoro (2015) used the POLYSUN program in their multi-purpose solar thermal systems to compare their cost effectiveness with multi-purpose PV based heat pumps [11]. Shipkovs et al. (2015) assessed the models found in the POLYSUN program in the northern latitudes and developed a dynamic simulation program containing 5 years of meteorological data. They optimized the solar cooling system using multiple simulations. ...
... They optimized the solar cooling system using multiple simulations. They evaluated the effect of different elements of the system on the operating performance and developed the most suitable model for the given climate conditions [12]. Good et al. (2014) used POLYSUN and PVsyst programs to optimize the solar energy potential in buildings [13]. ...
Bu çalışmada solar
termal sistemlerin ısı pompası ile kombinasyonu sayısal olarak incelenmiştir.
Kollektörlerin potansiyel faydası ısı pompası sistemleri kombine sistemlerle
karşılaştırılarak bulunmuştur. Muğla ili için tüm simülasyonlar POLYSUN
programı kullanılarak yapılmıştır. Simülasyonu yapılan sistemler tek haneli
konutların kullanım sıcak suyu ve konut ısıtması ihtiyacını karşılayacak
şekilde tasarlanmıştır. Bu çalışmanın sonuçları sistemin mevsimsel performans
faktörünün hava kaynaklı ısı pompası sistemine eklenen kollektör alanı arttıkça
arttığını göstermektedir. Ancak ısı talebinin karşılandığı sistemlerde ısı
pompasının ısıtma tesir katsayısının azaldığı sonucuna ulaşılmıştır. Bu
sistemde solar enerji sıcak su ihtiyacını karşılamak için kullanılırken bir
taraftan da konut ısıtılmasına destek olmaktadır. Ancak yetersiz kapasitede ısı
pompası seçilerek kollektör sayısının arttırılmasının talebi karşılamadığı bu
nedenle yeterli kapasitede ısı pompası seçilmesi gerektiği saptanmıştır. Isı
talebinin karşılanamadığı sistemlerde ise 2 kollektörden sonra ısıtma tesir
katsayısının sabit kaldığı görülmüştür. 2 kollektörden fazla sayıda kullanılan
kollektörler yazın ihtiyaç fazlalığından kapatılmaktadır. Ancak kış döneminde
ısıtmaya destek olmaktadır.
... Cold production is important for maintaining an optimum indoor microclimate during the summer. Shipkovs et al. has pointed out that solar energy can be used to decrease energy demand for cooling also in Latvia climate conditions [25]. This could be a good solution for offices in summer to reduce costs. ...
The research of five educational institution buildings and three municipality department buildings were carried out in Liepāja municipality, Latvia. Aim of the study is to draw attention to finding balance among energy efficiency, thermal comfort and indoor air quality dilemma. The research of recently renovated public sector buildings was done. The combination of factors that form microclimate and indoor air quality are described in the paper. Emphasis is put on a person's ability to perform mental tasks in regards of changes in thermal comfort and air quality. Surveys of buildings’ inhabitants and economic aspects of human productivity changes were carried out in the research. Also four ventilation scenarios have been modelled and economic benefits of each scenario have been assessed. Different air exchange rates can make 19% human productivity improvement. Using ventilation systems as it is designed already gives economic benefit and not all the buildings need additional investments for new system implementation. The economic benefit in four buildings is more than 20 000 euro already in second year. The priority for planning, designing and managing education institution buildings should be indoor environment and thermal comfort of inhabitant.
Today, with the increased popularity and availability of renewable energy sources the question of ensuring a proper household heating, that is energy, is not as complicated as it used to be. Users are embracing the environmental sustainability stand and are turning to heat pumps and solar panels as means of providing heat for their homes. The geothermal heat pump and solar thermal panels energy efficiency rates coupled make these the perfect choice for those, who are concerned about the impact they make on the environment-aspiring to zero emission buildings. The combined system of solar thermal panels and ground source heat pump for heating capacity 13 kW will be developed. The main novelty is the investigation of a new type of a solar thermal accumulation tank. Hypothetically this solar assisted ground coupled heat pump system should reach COP rate 4 and reduce electricity demand consumption by 40%. To find out the truth of proposed thesis, the research will be carried out. Both simulation and real-life object data analysis will be performed. As a result, the potential of such a system in northern latitudes will be determined.
