The schematic diagram of the laboratory installation and its photo are shown in Figs. 2 and 3. The warm and cold work vessels are made of cylinders and mounted one above another. The diameter and the height of the cylinders are 110 mm and 140 mm, respectively. Both cylinders are transparent and made of Plexiglas […]

The COP of the heat pump was determined by: COP = Q^ (1) W comp where Wcomp is the true power input to the compressor measured directly by the wattmeter, and Qc was determined by: Qc = mr (h2- h) (2) Where mr is the mass flow rate of the refrigerant, and h2 and h3 […]

A. ТЬйг and S. Furbo2 1 AEE INTEC, Feldgasse 19, 8200 Gleisdorf, Austria2 Department of Civil Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark * Corresponding Author, a. thuer@aee. at Abstract Based on elaborated knowledge in international research projects within IEA-SHC Task 26 and the ALTENER project “Solar Combisystems”, a new solar combisystem concept […]

The typical thickness of a PUR storage insulation is in the range of 10 to 12 cm [5]. Within this study the thickness has been varied between 7.5 cm and 17.5 cm (base case 15 cm). The results of the optimisation process for these variations are shown in Figure 3 (d) and Table 1. The […]

Temperature control of the heater has been set at 33°C in the first experiment. Temperature in the up-flow pipe was greater than in the tank-accumulator during the first hour. When these temperatures became equal, the rising of temperature in tank-accumulator stopped at the level of 25°C (see Fig. 4). The duration of the cycles became […]

S. Kaneko1* , M. Udagawa1 and T. Kusunoki1 1 Kogakuin University, 1-24-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 163-8677, JAPAN* Corresponding Author, dm07014@ns. kogakuin. ac. jp Abstract Total performance of solar hot water heating(DHW) system for an apartment house of 10 housing units was examined using the detailed simulation with EESLISM [4]. The simulation was carried out to […]

The complete solar combisystem consists of two units, the “Technical Unit” and the “Solar Store Unit” (see Fig 1 and Fig. 2). In the technical unit all components like boiler, pumps, mixing valve, switching valves, heat exchangers, hot water preparation unit, expansion vessels, etc. are pre-installed. The main difference of this concept compared to existing […]

The simulations of the base case were calculated with a comparably small rise in energy prices of 1.3 %/a for natural gas and 0.3 %/a over 20 years for electricity [6]. However the current development of prices in Germany amounts to 9.7 %/a (non inflation-adjusted) over the last seven years [7] which indicates a higher […]