CHP and CCHP Systems Today

The concept of the CCHP system (combined cooling, heating and power - combined cooling, heating and electricity generation) is described in this paper. The development of CCHP systems comes from the CHP system (combined heat and power generation), also known as cogeneration. CHP systems generate electricity from fuel combustion, heat as a by-product may contain even 60% to 80% of the total potential energy, and may be re-used for different applications. CHP is generally defined as the combined production of electricity (or mechanical) energy and useful thermal energy from the same primary energy source. Rated power of most of centralized power plants and industries which use CHP system exceeds 1 MW. Rated power of CCHP systems varies over a wide power range from 1 kW to 500 MW. CCHP systems have high potentials in different forms of energy supply

UVOĐENJE NAUČNE EKOLOGIJE U SVE OBLASTI POLJOPRIVREDNE MEHANIZACIJE

Great challenges are ahead of researchers when they plan to sustainably meet the needs of people, more than 10 billion, using the scarce resources of food, water and energy. The ability to meet the needs at the local level is critical because it is expected a significant population growth in less developed areas of the world. Compliance with the provisions of the scientific ecology and the introduction of cutting-edge achievements in nanotechnology opens up a number of changes in agricultural production. Yields can be doubled while reducing the usage of pesticides and GMOs. Political describe the environmental objectives given unwarranted importance of various types of repeatable source of energy from the sun, wind and geothermal over to bio raw materials. Most queries originating from the time periodicity and the local availability of such sources of energy. Today's electrical solar panels have a theoretical efficiency of 33%, with the actual efficiency about 15%. According to scientific ecology they prevent reflection of solar radiation and heat the environment and act completely anti-ecological. Combining energy sources is a necessity for the future, although it is more expensive. Ecological is quite normal that all complex systems in addition to the advantages of having a number of shortcomings.https://www.researchgate.net/publication/329530344_INTRODUCTION_OF_SCIENTIFIC_ECOLOGY_TO_ALL_AREAS_OF_AGRICULTURAL_MECHANIZATION_UVODENJE_NAUCNE_EKOLOGIJE_U_SVE_OBLASTI_POLJOPRIVREDNE_MEHANIZACIJEPublishe

Ušteda prirodnog plina za grijanje uporabom sunčeve energije

The paper presents the possibility of solar heating as a way of natural gas savings. Solar heating is ideally used in our climate area, considering a large number of sunny days and relatively high average temperatures in Croatia, resulting in higher efficiency of heating systems. The advantage of solar heating, compared to other methods (such as heating with natural gas), is in its environmental acceptability, and also in its partial autonomy, respectively in its applicability, without public utilities. Solar system, applied for one building heating, can save an average of 50-60 % annual energy needs. During the summer months a conventional heating system for hot water can work on a minimum energy needs or can be totally excluded, and thus eliminate harmful emissions (CO2), which occur as a by-product of burning conventional fuels. Using solar energy to produce thermal energy makes it possible to save considerable financial resources. Repayment of this system can be observed through the reduction of energy consumption (e.g. natural gas) during the preparation of consumable hot water (CHW) and/or space heating.U članku je prezentirana mogućnost solarnog grijanja kao načina uštede prirodnog plina. Solarno grijanje je idealno za naše podneblje, s obzirom da velik broj sunčanih dana i relativno visoka srednja temperatura u Hrvatskoj, rezultira većom učinkovitošću sustava grijanja. Prednost solarnog grijanja u odnosu na druge načine (npr. grijanje prirodnim plinom) je u njegovoj ekološkoj prihvatljivosti, a također i u njegovoj djelomičnoj autonomnosti, odnosno primjenjivosti i tamo gdje nema komunalne infrastrukture. Solarni sustav za zagrijavanje jednog objekta može u prosjeku uštedjeti 50 – 60 % godišnje potrebne energije. Tijekom ljetnih mjeseci, konvencionalni sustav za zagrijavanja tople vode, može raditi na minimumu ili se potpuno isključiti te time ukloniti štetnu emisiju plinova (CO2) koja nastaje kao nusprodukt sagorijevanja klasičnih energenata. Uporabom solarne energije za proizvodnju toplinske energije, mogu se s vremenom uštedjeti znatna materijalna sredstva. Otplata ovog sustava može se promatrati kroz smanjenje potrošnje energenata (npr. prirodnog plina) prilikom pripreme potrošne tople vode (PTV) i/ili za grijanje prostora

Ušteda prirodnog plina uporabom sunčeve energije

U članku se govori o mogućnosti uštede prirodnog plina uporabom sunčeve energije na primjeru grijanja u Srednjoj školi Valpovo