Heizung wissen

May. 29, 2008 – Low-energy and passive houses are superinsulated and air-tight buildings where the space heating demand is considerably lower than that of buildings constructed in accordance with common buildings codes. Due to the low space heating demand, the annual heating demand for domestic hot water (DHW) typically constitutes 50 to 85% of the [...]

Jul. 07, 2008 – As of February 2008 the test laboratory for heat pumps at ILK Dresden, Germany is accredited according to DIN EN ISO/IEC 17025. That will help to reduce long waiting periods for heat pump testing as recently complained by heat pump manufacturers. Accreditation was made for testing of water-to-water and brine-to-water heat [...]

Nov. 20, 2007 – The renovation of ASHRAE headquarters is expected to be completed in June 2008 at an estimated cost of $5.4 million. Once completed, the renovated building in Atlanta will feature two separate HVAC systems as part of its role as living lab. Level one of the building will be equipped with air-cooled [...]

Dec. 03, 2007 – The overall effi ciency of a heat pump system is highly dependent on the performance of the compressor. Compressors in heat pumps not only encounter a wider range of operating conditions than in traditional air conditioners, but also have two to three times longer run times per year than compressors for [...]

May. 16, 2007 – The conclusion from the latest Intergovernmental Panel on Climate Change (IPCC) report issued on 4 May is that technologies are available at a low cost to significantly reduce greenhouse gases. More specifically, the report, based on a study by more than 2,000 scientists, demands the use of al

Jun. 27, 2007 – Based on the coabsorbent cycles, recently introduced by the author, a particular new technology can be developed for extremely efficient and feasible heat pumping applications. The paper presents model results of residential and district ammonia/water heating applications for coabsorbent hybrid and absorption heat pumps, supplied by different winter and summer heating [...]

Jun. 27, 2007 – Conventional thermally powered water heaters are 80 to 95% efficient. The new thermally powered heat pump (TPHP) reported herein is over 140% efficient. In addition, the cold end of this TPHP produces useful chilling. The amount of energy-free chilling is equal to the amount of heat pumping. The combination of the [...]

Jun. 27, 2007 – Canada Canadian sawmills traditionally deliver 72 million m3 of resinous lumber per year. About 2% are dried using low-temperature heat pumps and the rest through other technologies using bark-, natural gas- or oil-fired boilers as primary energy sources. However, such products are well suited to high-temperature drying. Two hybrid (electricity/fossil) industrial-scale [...]

Jul. 03, 2007 – Norway The use of naturally occurring and ecologically safe substances as working fluids in heat pumps represents an environmental friendly and long-term solution to the problems of HFCs. The most important natural working fluids include ammonia, hydrocarbons and carbon dioxide. This article discusses the main characteristics of ammonia heat pumps, and [...]