Senior Mechanical Design Engineer; Renewable Thermal Systems

Position: Senior Mechanical Design Engineer (Renewable Thermal Systems)
Position:
Senior Mechanical Design Engineer (Renewable Thermal Systems)

Location:

London/ Hybrid
Salary: £55,000 - £65,000

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
1. 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