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Study finds R717 and R600 more efficient in geothermal heat pumps
Ammonia and n-butane systems in residential building had higher COPs than R134a and R22 systems.
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Study: 5 mm tubes cut HC charge and condenser size
Purdue paper says MicroGroove-tube design uses 41% less internal volume with a 57% reduction in footprint, while maintaining heat transfer performance.