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Solar Air-conditioning System Using Single-Double Effect Combined Absorption

Hajime Yabase, Kawasaki Thermal Engineering Co., Ltd. [email protected] Kiyoshi Saito, Waseda University [email protected] Muhammad Idrus Alhamid, University of Indonesia [email protected]

1.Solar System

The efficiency of Solar Thermal is better than that of Photovoltaic.

Efficiency of

Photovoltaic : 10% Solar Thermal : 40% < (in case of utilizing Hot Water)

From HP of NEDO http://app2.infoc.nedo.go.jp/kaisetsu/neg/neg02/index.html#elmtop 2. What’s Absorption ?

Cooling tower ☆Special Feature

Cooling -Free ( = Water ) ② Much less power consumption than electric chiller.

Air Handling ③ Various Energy Sources can be Unit Chilled Absorption (AHU) water Chiller utilized. 3 2. What’s Absorption Chillers? Energy Use Composition in Buildings in

Elevator For Air Conditioning: 43% Water Supply & Machinery Drainage Others Air Conditioning

Ventilation Water Transport

Hot Water

Electric Device Air Lighting Transport

By HP of The Energy Conservation Center, Japan

3. Solar Cooling Applications Conventional System From NEDO/HP

Collector

Cool wind Storage tank

Back-up Absorption chiller 1. Complicated system with a boiler for the back-up of hot water supply 2. Complicated control system to adjust hot water supply in accordance with the fluctuation of load and solar Low

5 3. efficiency of absorption chiller(single effect) 3. Solar Cooling Applications

Improveent System

Absorption Chiller(Combined) Single & Double Effect

1. Absorption chiller has a back-up system and no boiler 2. Absorption chiller is automatically moved to combustion for the stable supply 3. of chilled water High 6 efficiency of absorption chiller (Double Effect) 3. Solar Cooling Applications

Solar Cooling System at our Shiga factory

Solar Heat Collector (evacuated tube type)

Air conditioning for this office

Solar Hybrid Chiller 3. Solar Cooling Applications Evaluation status and results in Shiga (1)

thermal energy collection (kW) heating output (kW) cooling output (kW) solar radiation (W/㎡) 200 1000 800 150 600

100 kW

 20th May 400 W/m2 50 200  Max temp : 28.4ºC , 0 0 () air-conditioning loading 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 factor :23% input (kW) thermal energy use (kW) solar thermal (℃) outside (℃) 250 100  hot water obtained from the solar energy collector 200 75℃ 80 60℃

is used at 60~83℃ 150 60 ℃ kW 100 40  Enabled gas amount to be reduced by 25% 50 20 0 0 (hour) 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3. Solar Cooling Applications Evaluation status and results in Shiga (2)

thermal energy collection (kW) heating output (kW) cooling output (kW) solar radiation (W/㎡) 500 1200 400 1000 800 300

600 kW

200 W/m2 400  28th July 100 200 0 0  Max temp : 34.5ºC , 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 (hour) air-conditioning loading gas input (kW) thermal energy use (kW) factor :60% solar thermal (℃) outside (℃) 500 100

400 75℃ 80  hot water obtained from 60℃

the solar energy collector 300 60 ℃ is used at 60~75℃ kW 200 40 100 20  Enabled gas amount to be 0 0 reduced by 11% (hour) 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3. Solar Cooling Applications

Solar Cooling System in University of Indonesia (UI) is started from Jan. 2014 “Entrusted business on the technical cooperation for co-benefit type solar- aided air-conditioning system in Indonesia during the fiscal years 2013.” sponsored by Ministry of Environment Japan. This project includes detail designing of a solar cooling absorption chiller system utilizing solar energy with the prospect that the system prevails and expands in Indonesia, and includes studying measures for growth of the system in Indonesia by holding a local workshop and a year-end progress meeting.

Cooling Hot water tank New Building of University of Indonesia Solar heat collector Hybrid chiller Fuel Office 3. Solar Cooling Applications Verification of the effect relating to verification test of a solar cooling absorption chiller system utilizing solar energy in UI (1) Comparison equipment specification

Comparison between solar absorption chiller and conventional chiller【RP basis】