Best Practices
HVAC System
Ice-cooling storage system
An “ice-cooling storage air conditioning” system was installed, whereby the cooling unit produces ice at night, which is then stored and used to chill water for the air conditioning system during the day, which then cools the workshop and office space. This system does not only reduce electricity costs, it also cuts electricity consumption when the system loading is optimal. The system has a payback period of 36 months, has reduced annual electricity consumption by more than one million kWh, and has lowered Yeji’s carbon emissions by more than 30 per cent.
Dongguan Yeji Industrial Company Ltd.Wearing Apparel Manufacturing Industry
Water storage air conditioning system
Adopting a “water storage air conditioning” system, in which the cooling unit operates to create cold water during nighttime hours. This cold water is stored in a large water tank and then released during the daytime to cool environments in the workshop and office. This has resulted in a shift in electricity usage from peak to off-peak periods of up to 40 per cent. This has not only reduced electricity costs but also cuts electricity consumption when the system loading is optimal.
Dongguan Crystal Knitting and Garment Co., Ltd.Wearing Apparel Manufacturing Industry
Water-curtain HVAC system
Replacing traditional fans with a water-curtain HVAC system to reduce the temperature inside the workshops.
Jiangmen New Star Hi-Tech Enterprise Ltd.Fabricated Metal Industry
VFD air conditioning system with regular maintenance
Installing variable frequency drive (VFD) in compressors of air-conditioning system, using thermal insulating construction materials, performing regular maintenance on heat sinks
Ningbo Daye Garden Machinery Co., Ltd.Machinery, equipment, apparatus, parts and components manufacturing
Centralized air-conditioning system
Transformed the individual cooling system of their CNC hobbing machine into central air-conditioning, which translated into a savings of 9.1 percent on electricity and carbon emissions
Spintec Precision (Shenzhen) Ltd.Fabricated Metal Industry
Water curtain system
Reduce temperature of production lines, improve ventilation and hence reduce electricity consumption
Guangdong Atlan Electronic Appliance Manufacture Co., Ltd.Electrical Appliances and Houseware Industry
Environmentally friendly water curtain system
Installation of environmentally friendly water curtain system in production lines can reduce indoor temperatures and improve workshop ventilation
ZhongShan Yida Apparel Ltd.Wearing Apparel Manufacturing Industry
Equipping water pumps with variable frequency drives
Equipping water pumps with variable frequency drives, saving electricity consumption by about 28,000 kWh annually and resulting in carbon emissions reduction of about 19 tonnes annually.
Hop Yick Bangladesh LimitedWearing Apparel Manufacturing Industry
Optimising cooling chiller operating conditions
Optimising cooling chiller operating conditions, including determining the optimal chemical consumption during water treatment, optimal water change frequency, improving the maintenance schedule, setting a standard gas discharge pressure and monitoring compressor operating time. Together, these measures reduced annual electricity consumption by around 450,000 kWh and carbon emissions by about 229 tonnes
Mentholatum (China) Pharmaceuticals Co., Ltd.Pharmaceuticals industry
Transformation of exhaust fan cabinets to variable frequency
This involved installing individual air control valves in each workshop’s exhaust fan cabinet. These automatically reduce the main motor’s frequency by turning off air control valves that are not in operation, reducing annual electricity consumption by around 23,000 kWh.
Shenzhen Chow Tai Fook Jewellery Manufacturing Co., Ltd.Fabricated Metal Industry
Collecton of exhaust heat from generator for powering air conditioning absorption chiller system
Planning to collect exhaust gas heat at temperatures of around 400°C from natural gas generators via a waste heat recovery boiler. This will produce steam to power an air conditioning absorption chiller system, saving 10,400 tonnes of steam per year and reducing annual carbon emissions by 2,310 tonnes
Queen South Textile Mills LimitedWearing Apparel Manufacturing Industry
Ground source heat pump
The main air-conditioning system unit uses an energy-saving ground source heat pump with cooling and heating capacities of 688.3 kW and 688.4 kW respectively. Two hundred soil heat exchangers are installed 100m underground, utilising soil and surface water to increase the unit’s evaporation temperature and reduce condensation pressure. This reduces compressor power and save energy.
Positec Technology (China) Co., Ltd.Machinery, Equipment, Apparatus, Parts and Components Manufacturing Industry
