High-efficiency air conditioning with gas engine-driven heat pumps

Gas engine-driven compression heat pumps (GHP) are a highly efficient way to air-condition commercial and industrial buildings when the aim is to cut electricity use, optimise running costs and minimise contracted electrical capacity.

AISIN Toyota GHP systems use a variable-speed natural gas or LPG engine to drive the refrigeration compressor directly. Unlike a conventional electric heat pump, the waste heat generated by the engine is recovered to improve heating performance, keep a high capacity at low outdoor temperatures and reduce defrost cycles.

A single installation can provide cooling, heating and heat recovery for domestic hot water, offering high seasonal efficiency with very low electricity consumption.

Benefits of the technology

• Very low electricity consumption

Because the gas engine drives the refrigeration compressor, electricity is used almost only for fans, pumps and control systems. This significantly reduces the installed electrical capacity, lowers peak demand costs and makes it easier to install HVAC systems in buildings with a limited electricity supply.

• Smart heat recovery

The waste heat from the engine is used to increase heating efficiency and shorten defrost cycles. This energy recovery helps keep a high heating capacity even at low outdoor temperatures, improving the installation’s seasonal performance.

• High-efficiency technology

Continuous control of the Toyota engine adjusts the compressor speed to the building’s actual demand, optimising part-load operation and reducing energy consumption.

• Reliability and low running costs

Toyota engines have been developed for continuous operation, offering high reliability and a long service life. Using gas as the main energy source, combined with very low electricity consumption, reduces the overall running cost in buildings with a high HVAC demand.

Recommended applications

AISIN gas engine-driven compression heat pumps are a particularly suitable solution for:

• Hotels and resorts.
• Hospitals and healthcare centres.
• Offices and corporate buildings.
• Shopping centres.
• Schools and universities.
• Sports facilities and swimming pools.
• Industry and buildings with limited electrical capacity.