Simulation outline

1.1. Model house

As shown in Fig. 1, the standard model house of the Architectural Institute of Japan was used for the simulation. This model house is facing south and a wooden two-story single house. And a total floor is 125m2. The house is supposed to be occupied by a family of husband and wife and two children. The solar space and hot water heating system is modeled, as shown in Fig. 2. Solar collector 12m2 is mounted on a roof. A heat storage tank is only for domestic hot water (DHW) supply. The solar heating is used also for the floor heating. The room air conditioner is used as an auxiliary heat source in winter and cooling in summer. Expect in winter, a solar heating is used only for DHW heating.

3185 910 1820 2730

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Fig. 1. Floor plan of the south Fig.2. Simulation model for a single-family house with facing house. floor and hot water heating system

1.2. Calculation cases

The calculation cases were three cases as shown in Fig. 3. Case A is no adjacent houses and no active solar heating system, case B is adjacent houses and no active solar heating system and case C is adjacent houses and active solar heating system. The location was Tokyo (35degrees, North), Japan. The meteorological data used is the standard year weather data set of Tokyo prepared using AMeDAS data[5].

As shown in Fig. 4, the north and south distance is 3.75m and the east and west distance is 2.25m in the house arrangement in the Cases B and C. This assumes the typical residential area in the suburbs of Tokyo in which building ground area for a site area is about 50%. As shown in Table 1, building thermal insulation of the walls, ceilings and dirt floors are 135mm, 265mm and 100mm of a glass fiver, respectively, and the windows are transparent double glazed glass (3+A6+3) . The heating and cooling seasons are supposed as shown in Table 2. The space heating and cooling schedule and the set point temperature using the operative temperature are shown in Table 3. The domestic hot water (DHW) is supplied from the solar storage tank and the auxiliary boiler. Although DHW flow rates is changed according to a season and holiday or weekday etc, daily DHW flow rates are average 370 liter/day. The hot water set point temperature of DHW supply is 35oC from 0:00 to 20:00 and 42oC from 20:00 to 24:00. It is assumed that the outlet hot water temperature of the boiler is 52oC. As the data for the internal heat generation caused by lighting and household equipment, the dairy value summarized from hourly schedule of household

Подпись: Table 1. Thermal insulation of building envelope

appliance is 40MJ/day. The infiltration rate is assumed to be of 0.5 air change/hour throughout a day. In addition, the additional ventilation rate from the kitchen is assumed in the cooking time. For shading and insulation of the windows, light drapes and heavy drapes are used in the daytime and the night, respectively.

2.

Подпись: Ceiling [mm] Wall [mm] Floor [mm] Windows 265 135 100 Transparent double-glazed glass (3+A6+3) Table 2. Heating and cooling season
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Подпись: Heating season (Winter) Cooling season (Summer) Other season (Spring *Fall) 11/ 2- 4/22 6/22- 9/19 4/23-6/21 9/20-11/ 1 Table 3. Daily schedules of space heating and cooling operation .
Подпись: Room Operation time Heating Cooling LD 6:00-13:00 20 °C 28 °C 16:00-23:00 20 °C 28 °C MBroom 0:00-7:00 18 °C 30 oC 22:00-24:00 20 oC 28 oC CBS .CBN 0:00-7:00 18 °C 30 °C 20:00-24:00 20 OC 28 °C * Family 'Studyroom is a natural room temperature.

Simulation result