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planning:building_services:compact_hvac_systems

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planning:building_services:compact_hvac_systems [2017/12/13 17:46] – [Concept 3: Heating using biomass: the compact pellet stove unit] kdreimaneplanning:building_services:compact_hvac_systems [2019/02/21 11:10] – cblagojevic
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 ====== Compact HVAC systems ====== ====== Compact HVAC systems ======
  
-[[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps]]+[[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps]]  {{:picopen:members_only.png?25|}}
  
 ===== Concept 1: Air heating  - using the fresh air necessary for hygiene ===== ===== Concept 1: Air heating  - using the fresh air necessary for hygiene =====
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 Every house that is occupied by humans requires fresh air. Every house that is occupied by humans requires fresh air.
   * If the fresh air supply is left to chance, it shouldn’t be a surprise if there is poor indoor air quality.   * If the fresh air supply is left to chance, it shouldn’t be a surprise if there is poor indoor air quality.
 +
   * If heat is not recovered from the used air, there will be high ventilation heat losses – this isn't the way to achieve an energy efficient building with a good quality of indoor air.   * If heat is not recovered from the used air, there will be high ventilation heat losses – this isn't the way to achieve an energy efficient building with a good quality of indoor air.
  
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   * ** by using a small heat pump (compact heat pump unit)**   * ** by using a small heat pump (compact heat pump unit)**
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   * ** by using a small condensing boiler (compact condensing unit)**   * ** by using a small condensing boiler (compact condensing unit)**
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   * ** by using a small heat generator based on biomass fuel e.g. straw-pellets**\\   * ** by using a small heat generator based on biomass fuel e.g. straw-pellets**\\
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 +---- 
 ===== Concept 2: Air heating – using the residual heat from the exhaust air: the compact heat pump unit ===== ===== Concept 2: Air heating – using the residual heat from the exhaust air: the compact heat pump unit =====
-[{{ :picopen:compact_unit_passive_house.png?400|**The "classical" compact heat pump unit combines heating, ventilation and hot water generation in one easy to handle unit; everything revolves around air: it acts as the transporting medium for the heating and at the same time serves as the source of heat (on the exhaust air side) for the heat pump. An [[Planning:Calculating energy efficiency|Energy balance]] can show whether such a compact unit is adequate for heating a building.**}}] +[{{ :picopen:compact_unit_passive_house.png?350|**The "classical" compact heat pump unit combines heating, ventilation and hot water generation in one easy to handle unit; everything revolves around air: it acts as the transporting medium for the heating and at the same time serves as the source of heat (on the exhaust air side) for the heat pump. An [[Planning:Calculating energy efficiency|Energy balance]] can show whether such a compact unit is adequate for heating a building.**}}] 
-The amount of residual heat in the exhaust air of a home ventilation unit, also known as “enthalpy”, isn't particularly high, and condensing moisture contained in the air accounts for a large part of it. However, in a Passive House, the heat requirement is so small, that it can be covered almost completely by this residual exhaust air enthalpy. This concept was first published in 1995 by Wolfgang Feist. This facilitated the use of the [[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps|Compact heat pump unit]] in Passive Houses.+The amount of residual heat in the exhaust air of a home ventilation unit, also known as “enthalpy”, isn't particularly high, and condensing moisture contained in the air accounts for a large part of it. However, in a Passive House, the heat requirement is so small, that it can be covered almost completely by this residual exhaust air enthalpy. This concept was first published in 1995 by Wolfgang Feist. This facilitated the use of the [[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps|Compact heat pump unit]]  {{:picopen:members_only.png?20|}} in Passive Houses.
   
 Today, an increasing number of manufacturers offer such compact ventilation units. These units are highly efficient, as proven by scientifically evaluated measurements in Passive House housing developments.\\ Today, an increasing number of manufacturers offer such compact ventilation units. These units are highly efficient, as proven by scientifically evaluated measurements in Passive House housing developments.\\
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 ===== Concept 3: Heating using biomass: the compact pellet stove unit ===== ===== Concept 3: Heating using biomass: the compact pellet stove unit =====
 +[{{ :picopen:fireplace_in_passive_house.jpg?200|**Pellet-stove, the main heating system in a Passive House in Friedberg, Germany (Architect: Blumrich); the fully automatic stove also provides hot water; in the summer, solar collectors round off the concept: the stove doesn’t have to be heated then.**}}]
 Of course, not only Passive Houses can be heated using biomass. However, the available potential of sustainably-produced fuel is limited. In case of poor efficiency, only a fraction of the buildings in Europe (and also worldwide) can be sustainably supplied with biomass. However, if the level of efficiency is high enough, as it is in the Passive House for example, then the amount of fuel provided by sustainable agriculture and forestry is sufficient to cover a considerable share of the energy demand. Of course, not only Passive Houses can be heated using biomass. However, the available potential of sustainably-produced fuel is limited. In case of poor efficiency, only a fraction of the buildings in Europe (and also worldwide) can be sustainably supplied with biomass. However, if the level of efficiency is high enough, as it is in the Passive House for example, then the amount of fuel provided by sustainable agriculture and forestry is sufficient to cover a considerable share of the energy demand.
  
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 There are already some Passive Houses in which heat is mainly generated by using a standard wood-pellet stove ([[http://www.passivhausprojekte.de/projekte.php?lang=en&detail=185&keyword=Blumrich|Passive Houses Friedberg]]).\\ There are already some Passive Houses in which heat is mainly generated by using a standard wood-pellet stove ([[http://www.passivhausprojekte.de/projekte.php?lang=en&detail=185&keyword=Blumrich|Passive Houses Friedberg]]).\\
-\\ + 
-[{{ :picopen:fireplace_in_passive_house.jpg?200|**Pellet-stove, the main heating system in a Passive House in Friedberg, Germany (Architect: Blumrich); the fully automatic stove also provides hot water; in the summer, solar collectors round off the concept: the stove doesn’t have to be heated then.**}}] +---- 
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 ===== Concept 4: Heating using a condensing boiler: gas-based compact unit ===== ===== Concept 4: Heating using a condensing boiler: gas-based compact unit =====
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     * The condensing boiler requires very little combustion air. The ventilation system, which is the central component of each compact unit, can easily provide this amount of combustion air along with the fresh air, therefore separate combustion air conduction is not required.     * The condensing boiler requires very little combustion air. The ventilation system, which is the central component of each compact unit, can easily provide this amount of combustion air along with the fresh air, therefore separate combustion air conduction is not required.
 +
     * Condensate accumulates in the condensing boiler which must be drained away via a condensate pipe. Ventilation units with a cross-flow heat exchanger must also have a condensate drain. In the compact unit, these two parts are combined cost-effectively.     * Condensate accumulates in the condensing boiler which must be drained away via a condensate pipe. Ventilation units with a cross-flow heat exchanger must also have a condensate drain. In the compact unit, these two parts are combined cost-effectively.
 +
     * The exhaust air duct of the ventilation unit is already present for transporting exhaust fumes from the condensing boiler, thus dispensing with a separate exhaust pipe; however, this is possible only if the output is very small and if the quantities of exhaust fumes produced are small.\\     * The exhaust air duct of the ventilation unit is already present for transporting exhaust fumes from the condensing boiler, thus dispensing with a separate exhaust pipe; however, this is possible only if the output is very small and if the quantities of exhaust fumes produced are small.\\
 \\ \\
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 [[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps|Compact heat pump unit]] \\  [[planning:building services:compact HVAC systems:Certification and primary energy balance calculations for compact heat pumps|Compact heat pump unit]] \\ 
  
-[[Planning:building_services:heating_and_dhw:heating:Biomass heating in Passive Houses]] +[[Planning:building_services:heating_and_dhw:heating:Biomass heating in Passive Houses]]  {{:picopen:members_only.png?25|}} 
  
 +[[https://database.passivehouse.com/en/components/ | Passive House Component Database]]
planning/building_services/compact_hvac_systems.txt · Last modified: 2020/08/10 08:04 by alang