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)
Cascade Systems: Designing multi‑unit ASHP arrays for commercial peak loads. Defrost & Ambient Logic: Managing acoustic mitigation, airflow requirements, and defrost cycle impacts on system continuity. Bivalent Integration: Designing systems that integrate ASHPs with existing LTHW or backup heat sources.
Ground Source Heat Pumps (GSHP)
Array Design: Coordinating borehole heat exchangers (BHE), horizontal loops, and thermal conductivity testing. Ambient Loops: Designing 5th Generation heat networks and “sharing” energy across multi‑user sites. Passive Cooling: Leveraging ground temperatures for high‑efficiency cooling integration.
Hydronic Architecture (The “Engine Room”)
Low‑Temperature Hot Water (LTHW): Designing for Heat Pump efficiency (e.g., 45°C flow / 35°C return). Buffer & Separation: Precise sizing of buffer vessels and Low‑Loss Headers to prevent short‑cycling and maintain hydraulic separation. 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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