Shanghai Electric Fengxian: 1.1 MW molten-salt storage coupled to a high-temperature heat pump for steam
Shanghai Electric (acceptance 9 May 2025): a 1.1 MW / 10.8 MWh molten-salt store coupled to a high-temperature heat pump, supplying industrial steam at a factory in Fengxian, Shanghai. This is thermal storage plus a heat pump, not a process-steam heat pump of the closed-cycle plus MVR type. Not independently metered here.
Engineering data
- Case type
- Public-source case
- Data status
- public_source
- Industry
- Manufacturing
- Source temperature
- Not disclosed
- Sink temperature
- Not disclosed
- Temperature lift
- Not applicable
- Heating or cooling duty
- 1100 kW
- Architecture
- Single-tank molten-salt storage coupled to a high-temperature heat pump for green steam
- Result status
- Shanghai Electric reported that after more than two months of trial operation the system passed the owner's acceptance on 9 May 2025 and entered commercial operation. Steam conditions are not published as one fixed pair.
- Key risk
- A combined efficiency above 100% is an accounting claim, not a vapor-compression COP. Do not file this entry under process steam heat pumps.
- Existing system
- Industrial steam demand at the Fengxian factory; the published system charges a molten-salt tank and releases steam
- Refrigerant
- Not stated in the acceptance note used here
- COP
- Not disclosed
- Annual savings
- Source claim: about 743 kWh electricity per tonne of steam, described as 12% below the comparison they use; a stated combined efficiency of 102% is not treated here as a heat-pump COP
- Estimated payback
- Not disclosed in the note used here
Project background
The central research institute of Shanghai Electric published a molten-salt and high-temperature heat-pump steam system at a factory in Fengxian, Shanghai, China. The library tag is thermal storage, so it stays apart from operating process-steam heat pumps such as the delfort and Takeda entries.
Narrative inputs
Published ratings: 1.1 MW and 10.8 MWh of storage. Steam temperature and pressure are not fixed in the note used here. Electricity use is stated as about 743 kWh per tonne of steam.
Heat pump solution
A single-tank molten-salt store is coupled to a high-temperature heat pump. The institute describes static salt heat exchange, coordinated control, and load following. Steam is the delivered product; the machine is not described as a closed heat pump plus MVR.
COP & savings
Acceptance is dated 9 May 2025 after a trial longer than two months. The 102% combined-efficiency figure and the 743 kWh/t claim are repeated only as source statements. No COP is shown on the card.
Investment / ROI notes
Capital cost and payback are not in the note used here.