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--- planning:building_services:ventilation:comparison_of_energy_performance_of_ventilation_systems_using_passive_vs_active_heat_recovery [2020/08/10 07:56] – created alang
+++ planning:building_services:ventilation:comparison_of_energy_performance_of_ventilation_systems_using_passive_vs_active_heat_recovery [2020/08/17 10:32] – alang
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 Figure 1 also shows that the additional electricity demand of a heat pump solution for heat recovery is typically on the order of 10 kWh/(m² yr), a value that is much higher than the total electricity consumption for heating in a Passive House with a heat pump system.
-[{{  :picopen:vent_article_tmikeska_figure_1.png  |**Figure 1: Comparison of final energy use of different investigated systems (including frost protection and energy for fans)**}}]
+[{{  :picopen:vent_article_tmikeska_figure_1.png?800  |**Figure 1: Comparison of final energy use of different investigated systems (including frost protection and energy for fans)**}}]
-[{{  :picopen:vent_article_tmikeska_figure_2.png  |**Figure 2: Comparison of final energy use of different investigated systems shown in %**}}]
+[{{  :picopen:vent_article_tmikeska_figure_2.png?800  |**Figure 2: Comparison of final energy use of different investigated systems shown in %**}}]
 =====Representation of active heat recovery systems in the PHPP=====
 Calculating active heat recovery systems in the PHPP requires that the ventilation heat recovery rate is set to zero. This will result in the correct annual heating demand and peak heating load that need to be covered by the heating system. The properties of the heat pump in the active heat recovery system, as a function of the ambient temperature, are entered in the Compact worksheet.
-{{:picopen:how_to_insert_active_system_in_phpp.pdf|How to insert an active system in PHPP version 9}}
+[[planning:building_services:ventilation:comparison_of_energy_performance_of_ventilation_systems_using_passive_vs_active_heat_recovery:how_to_insert_active_system_in_phpp|How to insert an active system in PHPP version 9]] {{:picopen:members_only.png?20|}}
 If space heating is provided by the active heat recovery plus an additional heat pump, or if the active heat recovery system is operating in different modes (outdoor air / recirculation air), the average COP of the total system needs to be entered into the performance map in the Compact worksheet. This will require that the fraction provided by each system is estimated in an auxiliary calculation.
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 It is also important to mention that products with active 'heat recovery' systems are sometimes presented as combined units for ventilation, heating and cooling. For this application the designer must evaluate carefully if the units have sufficient capacity to cover both the ventilation and space heating load.
-It should go without saying that the most appropriate mechanical system must always be identified for a specific building. There are cases (e.g. very mild climates) where direct-passive-heat recovery is not absolutely necessary and there are also cases in which extract air heat pumps can be integrated efficiently into the overall mechanical system. Energy modelling provides guidance on the impact on the heating/cooling demand, as well as the final energy needs. The combination of both a passive core and an exhaust air heat pump can be a highly attractive integrated solution to efficiently provide heating, cooling, dehumidification and DHW - see this article on [[playground:compact_hvac_systems|compact heat pump units]].
+It should go without saying that the most appropriate mechanical system must always be identified for a specific building. There are cases (e.g. very mild climates) where direct-passive-heat recovery is not absolutely necessary and there are also cases in which extract air heat pumps can be integrated efficiently into the overall mechanical system. Energy modelling provides guidance on the impact on the heating/cooling demand, as well as the final energy needs. The combination of both a passive core and an exhaust air heat pump can be a highly attractive integrated solution to efficiently provide heating, cooling, dehumidification and DHW - see this article on [[planning:building_services:compact_hvac_systems|compact heat pump units]].