Caption: Figure 7 Characteristic of Heat recovery unit modular water-to-water heat pump
with scroll compressor controlled by variable-frequency-drive
Caption: LEFT Mechanical penthouse showing chilled water pumps with water-to-water heat pump
The geothermal system consists of a reversible water-to-water heat pump
, a vertical borehole heat exchanger, and two hydraulic groups (Figure 1).
The following elements were adopted to improve the performance of a water-to-water heat pump
for ground-source applications:
The new Cowichan Campus building at the Vancouver Island University uses a geo-exchange field, water-to-water heat pump
, 100% outdoor air, natural and displacement ventilation systems and other strategies to achieve LEED Canada Gold certification.
Aquathermal Central Water-to-Water Heat Pump
Following weeks of analysis, cost estimating and discussions with the owner, the engineering design team determined the best fit for the college, as far as energy efficiency and creating a demonstration piece for the academic learning community, was to incorporate a central geoexchange water-to-water heat pump
system to serve the North Building.
A large-capacity ([greater than or equal to] 1,500 MBH [440 kW]) water-to-water heat pump
(WTWHP) is a water-cooled chiller that has been adapted to produce hot water at a specified temperature.
Water-to-water heat pumps
. ASHRAE Journal 51(1):28-30, 32-5.
The use of water-to-water heat pumps
and chillers allowed for heating hot water to be generated without the burning of natural gas, consistent with our net zero carbon goal.
In the past year, geo-thermal test wells were successfully dug on the grounds of the Museum--which means that the Museum will be able to install a geothermal heating and cooling system--the first of its kind in a New York City cultural institution, which will use water-to-water heat pumps
and six 300-foot-deep wells to heat and cool the building.
The slab system is supplied with hot or cold water by an array of water-to-water heat pumps
. Operation has been on a seasonal basis to offset baseline heating and cooling loads with the supplemental air system meeting peak demands.