Heat pumps transform renewable energy from the ambient air, ground or water to useful heat for comfort heating and hot tap water. The most common heat pump technology employs a very efficient refrigeration cycle that typically delivers 3 to 5 times more useful energy than is absorbed in driving the compressor. Some heat pumps are reversible, which means that they can provide heating in winter and cooling in summer.
Ground source heat pumps
The ground source heat pump (GSHP) uses the energy stored in the bedrock, surface soil, or water as the heat source for the evaporator. Our BPHE evaporators have optimized distribution devices to ensure the best possible efficiency in GSHP evaporator duties.
We have a wide range of BPHEs with a long thermal length, which helps to maximize the efficiency of the condensing operation. We also offer double-wall BPHEs for extra safety, for example when the refrigerant circuit heats tap water directly.
Air-to-water heat pumps
In air source (AtW) heat pumps, outdoor/exhaust air is used as the heat source in an air coil to evaporate the refrigerant. After the compressor, the energy is released into a water circuit that is used to provide comfort heating or to heat tap water, in a similar way to the GSHP condenser.
At low ambient air temperatures, the evaporation temperature of the air coil falls below the freezing point of water. Moisture condensing on the coil freezes, reducing the efficiency of the system. A common way to melt the ice from the air coil is to reverse the system, making the air coil the condenser and the BPHE the evaporator. Many AtW heat pumps are also designed to operate as AC chillers in the summer, again by reversing the system to make the air coil the condenser and the BPHE the evaporator.
Our high-efficiency BPHE condensers can be equipped with a distribution system to improve performance and reduce the risk of freezing when they are operating as evaporators.
To increase efficiency in AtW heat pumps, some compressors are equipped with an economizer port. The economizer function cools the compressor and increases the sub-cooling of the liquid refrigerant. We have a standard economizer selection for Emerson Copeland EVI compressors.
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