27th May,
Position: Senior Mechanical Design Engineer (Renewable Systems) Location: Bristol/ Hybrid Salary: 75,000 – 90,000
We are looking for a specialist Mechanical Design Engineer to lead the transition from fossil fuel combustion to large-scale heat pump technology. You will be responsible for the "physics" of the system, ensuring that high-capacity heat pumps are integrated into hydronic circuits that actually deliver on their efficiency promises.
Core Technology Focus
* Air Source Heat Pumps (ASHP)
o Cascade Systems: Designing multi‐unit ASHP arrays for commercial peak loads.
o Defrost & Ambient Logic: Managing acoustic mitigation, airflow requirements, and defrost cycle impacts on system continuity.
o Bivalent Integration: Designing systems that integrate ASHPs with existing LTHW or backup heat sources.
* Ground Source Heat Pumps (GSHP)
o Array Design: Coordinating borehole heat exchangers (BHE), horizontal loops, and thermal conductivity testing.
o Ambient Loops: Designing 5th Generation heat networks and "sharing" energy across multi‐user sites.
o Passive Cooling: Leveraging ground temperatures for high‐efficiency cooling integration.
* Hydronic Architecture (The "Engine Room")
o Low‐Temperature Hot Water (LTHW): Designing for Heat Pump efficiency (e.g., 45°C flow / 35°C return).
o Buffer & Separation: Precise sizing of buffer vessels and Low‐Loss Headers to prevent short‐cycling and maintain hydraulic separation.
o System Balancing: Specifying PICVs and variable‐speed pumping to ensure optimal mass flow rates.
Key Professional Duties
* Detailed Modeling: Using IESVE or Hevacomp to ensure heat loss calculations meet BS EN standards.
* BIM Coordination: Utilizing Revit MEP for 3D spatial coordination of complex plant rooms.
* Technical Compliance: Ensuring all designs meet CIBSE CP1 (Heat Networks) and MIS (MCS) standards.
Candidate Profile
* Technical Background: Degree‐qualified (BEng/MEng) with a deep understanding of thermodynamics.
* Professional Status: CEng or MCIBSE preferred.
* Experience: Proven track record of designing ASHP or GSHP systems, not just supervising them, but performing the actual hydronic and thermal calculations.
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