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Senior Mechanical Design Engineer (Renewable Thermal Systems)

Job Posted: 12 days ago

Salary: £ Competitive
Job Type: Permanent
Location: Wiltshire

Expire in: 16 days

Job Description

Position: Senior Mechanical Design Engineer (Renewable Thermal Systems) 
Location: Bristol/ Hybrid
 Salary: £65,000 - £80,000

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 Focus1. 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.  2. 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.    
 
  3. 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 12831 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 3005 (MCS) standards.  Candidate Profile  
Technical Background: Degree-qualified (BEng/MEng) with a deep understanding of thermodynamics. 
Professional Status: CEng or MCIBSE preferred. 
Experience: You must have a 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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