Senior Mechanical Design Engineer (Renewable Systems)

Position: Senior Mechanical Design Engineer (Renewable Systems)

Location: London/ Hybrid

Salary: GBP75,000 – GBP90,000

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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