The Grid-Integrated Design
The paper's proposed 30 hp module, a plant of 5–500 modules, and the reasoning behind a practically stepless electrical load.
Analysis of the off-grid pilot led Sisyan to propose a larger module based on the same mechanical and hydraulic principles. The paper described a plant that could use intermittent energy directly and/or use grid energy when it was most cost-effective.
Proposed module
Each module would use a Danfoss APP 17 pump, Danfoss APM 10.2 energy-recovery motor, a 30 hp three-phase motor, an adjustable-ratio V-belt transmission, a variable-frequency drive, controls, and two pressure vessels containing ten eight-inch seawater membrane elements.
The paper envisioned plants in the range of 5–500 modules, with average operation above fourteen hours per day. Each module's power demand was about 22 kW, allowing plant demand to change in small increments.
What was proposed, and what was not
The design was a proposal informed by the pilot. The paper identified possible demand-response, frequency-regulation, reserve, and energy-price uses, while explicitly noting that value would be site-specific and would require analysis of operating costs, water demand, and market conditions.
The diagrams and specifications are reproduced in the original PDF and on the M-30 system page.
Proposed M-30 module flow
What the 303 L/min design flow would produce
This is a design calculation, not a reported operating result. The paper specifies 303 L/min feed and 42% proposed yield.
- Permeate
- 127 L/min
- Brine
- 176 L/min
- Pressure
- 720 psi maximum
Calculated from the proposed module
A plant adjustable in approximately 22 kW steps
The paper envisioned plants containing 5-500 independently controlled modules. Every additional module would add or remove about 22 kW of load.