Page 116 - Low Temperature Energy Systems with Applications of Renewable Energy

Effective use of heat pumps for various heating applications 105

Fig. 3.20 Heat pump air heating system. OH, heated object; Q oh , heat losses from OH.

Fig. 3.21 Heat pump air heating system with ventilation.

3.3.2.2 Air heating and ventilation with heat recovery unit and
recirculation of exhaust air
In a previous subsection we discussed “ventilation with heat recovery and exhaust air
recirculation” and displayed Fig. 3.19. That same figure is appropriate to illustrate the
content of this subsection; the reader may wish to refer back to it. There are some dif-
ferences in notation but the flow directions are the same. The simultaneous use of a
heat pump with a recovery unit and recirculation represents the most efficient level
of heat utilization of exhaust air.