BP38 - Solar water heater
| Address: Thuan An, Binh Duong Province | |
| Name of the Manager: Mr. Ngoc | |
| Project Summary: A footwear company in Binh Duong Province has installed a solar water heating system for supplying preheated feedwater to the oil-fired boiler. The program objective is to reduce energy costs and greenhouse-gas (GHG) emission. | |
| Year of implementation: 2018 | |
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Status before implementation The plant used a diesel oil-fired boiler for supplying steam to the canteen area. The boiler had a capacity of 1.5 tons/hour The boiler was operating under low load mode as it only operated for about 4.5 hours/day (3 hours in the morning and 1.5 hours in the afternoon). Average steam quantity supplied during the survey period was 1,779 kgs/day. Oil consumption was 254 kgs of DO/day. Due to the low load operation, the boiler efficiency was remarkably low (43.1% - calculated by the direct method).
Plant’s boiler and steam supply diagram |
Result The plant has installed a solar water heating system for supplying preheated feedwater to the boiler. A solar water heating system has a capacity of 6 m3/day (Khang Dai supplier). In addition, the plant has optimized the boiler blowdown, and after implementation, the recorded quantity of feedwater is about 3.75 m3/day. The hot water temperature from the solar water heating system is over 650C during the survey period.
Solar water heater and operating parameters The boiler efficiency after implementing the energy saving solution is 62% (calculated by the direct method). |
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Status before implementation The plant used a diesel oil-fired boiler for supplying steam to the canteen area. The boiler had a capacity of 1.5 tons/hour The boiler was operating under low load mode as it only operated for about 4.5 hours/day (3 hours in the morning and 1.5 hours in the afternoon). Average steam quantity supplied during the survey period was 1,779 kgs/day. Oil consumption was 254 kgs of DO/day. Due to the low load operation, the boiler efficiency was remarkably low (43.1% - calculated by the direct method).
Plant’s boiler and steam supply diagram |
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Result The plant has installed a solar water heating system for supplying preheated feedwater to the boiler. A solar water heating system has a capacity of 6 m3/day (Khang Dai supplier). In addition, the plant has optimized the boiler blowdown, and after implementation, the recorded quantity of feedwater is about 3.75 m3/day. The hot water temperature from the solar water heating system is over 650C during the survey period.
Solar water heater and operating parameters The boiler efficiency after implementing the energy saving solution is 62% (calculated by the direct method). |
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| Result of the project: | |
| Total investment costs: | VND 875 Million |
| Power saving: | 48,438 kgs of DO/year. |
| Cost savings: | VND 716 Million |
| Payback time: | 1.2 years |
