What are the key technical challenges and design options for optimizing a geothermal heat pump design? Review the pros and cons involved with centralized or distributed pumping, with hybrid or decoupled systems, and with the controls that can guide them.
With 10 LEED certified facilities and millions of additional square feet in the works, a well-known global Internet company committed to running green facilities was facing cooling and maintenance challenges at several of its data centers.
Kevin Amyot had serious qualms last spring when contractor Ed Friedrich first proposed a major pump-retrofit project at the Sunset Motor Inn, one of the properties Amyot manages for the H. A. Manosh Corporation in Morrisville, VT. Friedrich’s $13,000 estimate called for the replacement of 18 fixed-speed circulating pumps in the heating system at the Sunset with 10 circulators from the Grundfos Pumps Corporation.
When Ross Cailotto, the owner of R.E.C. Service Corp., heard about the KE2 Evaporator Efficiency controller (KE2 Evap), he knew he had found the solution. Before having the KE2 Evap, replacing an old Beacon system with mechanical controls meant moving product from the walk-in to temporary storage while the refrigeration system was off for 8 hrs or more.
Leaning on experience and data from various K-12 cities and projects, the author pursues some less conventional design approaches. They may revolve around radiant heating and/or cooling, but depending on school size and other factors, the smart use of heat recovery, DOAS, and improved central plants could also put a project on the HVAC honor roll.