VENTILATION HEAT RECOVERY WITH COOLING
Figure 4: Net energy consumption for a nursery home common room
500 450 400 350 300 250 200 150 100 50 0
Common room in nursery home
NVHRC
Balanced mechanical ventilation Conventional natural ventilation
Mech. exhaust with a heat pump on the air outlet Kindergarten
Figure 7: Operational costs for the sports hall and office
16000 14000 12000 10000 8000 6000 4000 2000 0
Sports hall NVHRC
Balanced mechanical ventilation Conventional natural ventilation
Mech. exhaust with a heat pump on the air outlet Office
Figure 5: Net energy consumption for a sports hall and an office
150 125 100 75 50 25 0
Sports hall NVHRC
Balanced mechanical ventilation Conventional natural ventilation
Mech. exhaust with a heat pump on the air outlet
NVHRC makes it possible to recover the heat in the outlet air from natural ventilation and use the extracted heat from the cooling process for heating water
Figure 6: Operational costs for the nursery home common room
3500 3000 2500 2000 1500 1000 500 0
Common room in nursery home
NVHRC
Balanced mechanical ventilation Conventional natural ventilation
Mech. exhaust with a heat pump on the air outlet Kindergarten
chilled beams, embedded pipe systems, or split units could be used. The research undertaken for this project found that 25% to 100% of the heat extracted from the cooling process can be re-used for heating.
Energy savings The research project has also calculated example capital and operational costs of NVHRC on the basis of four types of buildings or rooms (in Denmark): a common room in a nursery (77 sq m), a sports hall (645 sq m), a kindergarten (200 sq m) and an office building (4,200 sq m). These calculations have been applied separately for NVHRC, balanced mechanical ventilation, conventional natural ventilation and simple mechanical
46 CIBSE Journal July 2011
www.cibsejournal.com Office
have been used for domestic hot water needs, unless there is a need to provide both space heating and cooling in the same building. When using conventional cooling
(without a heat pump), the extracted heat is often released without being used. With NVHRC, the extracted heat from the cooling process is considered a resource rather than a by-product. Instead of cooling the intake air, a chilled ceiling,
EURO
kWh/m2
kWh/m2
EURO
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