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 examine the appropriate collector area and the storage tank volume for the central type of DHW supply system. The result for an apartment house showed that the collector area of 30-50m2 is appropriate to expect the solar contribution of 37.1-91.8% while the solar contribution is strongly depending on DHW supply rate. The appropriate storage tank volume is 1.0-1.5m3 in the studied cases. The economical efficiency of DHW system showed that the equipment cost should be suppressed below 2 million JPY if expecting the pay back period of 10 years.

Keywords: Collector area, Storage tank volume, DHW heating load, Equipment cost

1. Introduction

In the past studies [1-3], the solar hot water heating(DHW) system for an apartment house of 10 housing units was simulated in order to examine the difference of tilt angles and azimuths of the collector. In this study, in order to find the relationship of collector area and storage tank volume of the DHW system, the simulation study was carried out. The suitable combination of the collector area and the storage tank volume with considering initial cost are examined by simulating the yearly performance of the solar DHW system for the apartment house.