1. Energy- and mass flows in cooling and in heat pumps
Martti Veuro

2. direction of heat flow Cooling with compressor cycle electricity P, W
heat exchanger, evaporator
indoor air, supply air, φ2, Q2
heat exchanger, condenser
outdoor air
φ1, Q1
cooling process, refrigerant cycle
direction of heat flow

3. Indirect cooling and indirect condensing, compressor cooling
electricity P, W
indoor air, supply air,
φ2, Q2 HE
heat exchanger, evaporator
heat exchanger, condenser
indirect cooling, water circulation
indirect condensing, non freezing fluid circulation HE
outdoor air
φ1, Q1
compressor cooling, refrigerant cycle
direction of heat flow

4. Free cooling with outdoor air, eletrically driven cooling compressor is replaced with heat exchanger
indoor air, supply air,
φ2, Q2 HE
heat exchanger HE HE
outdoor air
φ1, Q1
indirect condensing, non freezing fluid circulation
indirect cooling, water circulation
direction of heat flow

5. Free cooling, energy well / ground as a heat sink, heat is transferred to the ground
heat exchanger HE
indoor air, supply air
cooling water circulation
energy well fluid circuit HE
energy well, ground
direction of heat flow

6. Heat pump, ground as a heat source
direction of heat flow
indoor air, supply air, HDW HE
heat exchanger, HE, condenser
heat exchanger, HE, evaporator
heating water circuit
heat source loop, fluid circuit HE
heat source: ground
cooling process, refrigerant cycle
electricity P, W

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