太阳能热电站闭式热流体回路熔盐介质压力平衡故障技术咨询

Hey there, great job narrowing down the problem to the medium switch—this kind of targeted testing saves so much time! Since your water-based (MSL) two-tank loop works perfectly, the issue is almost certainly tied to molten salt's unique properties or how the Alberto branch implements its fluid model. Let’s break down key areas to investigate:

• Fluid Property Mismatches
  Molten salt has way different thermal/physical traits than water: higher viscosity at low temps, distinct thermal expansion rates, and unique pressure-temperature relationships. First, verify that the Alberto branch’s molten salt model accurately defines these properties. Cross-check the model’s calculated pressure at your operating temp against established molten salt data—any discrepancy here is a critical red flag.

• Initial Pressurization & Fill Logic
  Molten salt expands drastically when heated, which means closed loops need precise initial filling and pressurization (unlike water). If your system’s pressure balancing logic uses the same venting/fill procedure for both media, it might not account for molten salt’s expansion-driven pressure spikes. Double-check if the Alberto branch includes adjustments for this thermal expansion behavior, or if you need to tweak your pressure relief/venting setup.

• Component Calibration for Molten Salt
  Even simple loop components (sensors, pumps, valves) can behave differently with denser, more viscous molten salt. For example, a pressure sensor calibrated for water’s density might give incorrect readings with molten salt. Look for any component model adjustments in the Alberto branch tailored to molten salt—if none exist, you may need to update sensor/pump parameters to match the medium’s properties.

• Branch-Specific Model Quirks
  Sometimes custom branch code introduces unforeseen hardcoded parameters. Compare the Alberto branch’s molten salt model side-by-side with the MSL water model to spot differences in pressure calculation or regulation logic. For instance, maybe the molten salt model assumes a fixed operating pressure range that doesn’t align with your loop’s design.

• Thermal Stratification Impacts
  Molten salt is prone to thermal stratification in tanks, creating localized pressure gradients that water rarely exhibits. If your pressure balancing logic assumes uniform tank temperature, it might miss these stratification-driven pressure shifts. Check if the Alberto branch’s tank model includes stratification handling—if not, try adding a simplified stratification layer to test if that resolves the imbalance.

Start with a minimal test case: run just the molten salt model with a single tank to isolate whether the problem lies in the fluid model itself or the loop’s pressure balancing logic. That should help you pinpoint the exact issue quickly.

内容的提问来源于stack exchange，提问作者Darcy Corbett