European and national policy and trends promoting the development and use of renewable energy recently caused a boom for solar systems for DHW and heating in family houses in this country. Whether it makes sense, what are the problems for such systems since we can expect and how to optimize these systems, this post.
The evaluation of the heating period for the calendar year 2010 is useful for producers and consumers, who work on a January-December regime. It also provides data to energy experts for assessing the operational energy consumption of buildings. It also provides figures for the controlling of boilers, according the Decree 276/2007 Coll.
The paper discusses the alternative heat sources to central district heating for panel buildings. Nowadays, most of the reconstructions of panel buildings cover only the improvement of thermal quality of the building envelope in order to decrease the heat loss and the operating costs of heating. With high-quality insulated envelope it is possible to achieve high reduction of thermal heat loss. Additional reduction of heat loss on the envelope insulation side is very expensive. In order to reach another reduction of operational costs in the building it could be more efficient to change the heat source with cheaper energy.
Based on the observations made at the Prague-Karlov station, the 2009/2010 heating season was a little shorter, 217 days, and the average temperature was 4.3ºC, slightly cooler than the long-term average. The basic characteristic necessary for heating is 3187 dº (19) degree days, so the needs for heating were slightly lower than the long term average.
Low energy (LEB) and passive buildings (PB) are becoming standard for new constructions in EU countries. They aren't experiments anymore, but absolutely ordinary mass production of sophisticated residential buildings. Only in Germany, Austria and Switzerland there are already thousands of buildings that meet the passive standard and their number doubles every year. The cost of passive buildings is only 5-7 % higher than those of conventional ones, and yet, their consumption of energy and heating is up to 90 % lower! Part 2. about regulation ventilation system.
Low energy (LEB) and passive buildings (PB) are becoming standard for new constructions in EU countries. They aren't experiments anymore, but absolutely ordinary mass production of sophisticated residential buildings. Only in Germany, Austria and Switzerland there are already thousands of buildings that meet the passive standard and their number doubles every year. The cost of passive buildings is only 5-7 % higher than those of conventional ones, and yet, their consumption of energy and heating is up to 90 % lower!
Author raises discussion and proposed changes in the rules of the energy audit. Draws attention to the criteria for evaluating alternatives and to small requirements for variability solutions. Read controversy of the author and reviewer who considers the methodology as sufficient and sees a problem in processing audits.
The author of this expertly written article shows, with results practically verified, that the proper functioning of heating with savings of up to 40% with a 1.3ºC increase of internal temperature can be guaranteed only with the proper activation of temperature sensors and with a complete projected adjustment of thermoregualted valves and heads, which traditional heating projects do not address. That is why traditional heating projects do not provide neither the proper functioning, nor full heat savings from the control technologies.
On Jan. 1st, 2011 the Government Regulation 91/2010 Coll., on the conditions of fire safety during the operation of chimneys, flues and fuel appliances, will come into force. On that day they Decree no. 111/1981, on the cleaning of chimneys, will be repealed. The following text is focused mainly of the provisions related to the venting of gas appliances.
The directive 2010/31/EU on the Energy Performance of Buildings – called EPB, EPBD II or EPBD Recast – was passed last May. EU member countries are obliged to implement these new requirements into their national legislations. The implementation of 2010/31/EU was addressed by a number of seminars during the recent Aqua-therm 2010 trade fair. The following article presents you with the most important facts from the presentations and with links to information that was published before and during Aqua-Therm 2010.
Designing solar systems so they will produce the the most heat during the year or electricity at the lowest cost is quite a complex matter. A number of factors should be considered when calculating the solar systems, especially the intensity of the solar radiation in individual locations throughout the year. Without a simulation software that can work with this variable data, the calculation can only be very approximate. If we want to get more accurate results and fast, using sofware is esential.
Article provides detailed information about long-term tests of heat pumps, made by the agency Frauhofer ISE. It monitored the effectiveness of the use of heat pump air-water, ground-water and water-water in the 170 low-energy houses and in existing buildings. Author used the measured values of seasonal performace factors and the current energy prices in the Czech Republic to present the differences between different types of heat pumps and heating systems.
