Novel speed-controlled exhaust-air to supply-air heat pump combined with a ventilation system

Siegele, Dietmar; Ochs, Fabian; Feist, Wolfgang

doi:10.1016/j.applthermaleng.2019.114230

Cited by 17 publications

(12 citation statements)

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“…Compared to an extract air HP, the temperature level of the evaporator in an exhaustair HP is lower, but the air is almost saturated. Hence, the enthalpy is still higher than that in ambient air [10,11]. The authors in Ref.…”

Section: Review Of Compact Air-sourced Heat Pumps For Renovationmentioning

confidence: 95%

“…This can happen even if the ventilation system is equipped with an enthalpy exchanger (EE), as shown in Refs. [11,12]. Thus, the maximum specific heating load that can be provided by the system corresponds to approximately 10 W/m 2 for typical residential buildings with typical Energies 2022, 15, 4679 3 of 30 occupation density, making this type of solution not adequate in case of renovations in which specific heating loads are higher than 25 W/m 2 [27].…”

Section: Review Of Compact Air-sourced Heat Pumps For Renovationmentioning

confidence: 99%

“…The performances of the supply air HP without (Section 2.1.1) and with secondary air recirculation (Section 2.1.3) were measured in the lab (in the so-called HP compact unit test rig of UIBK [11]). The air ducts were connected to two climatic chambers, one for the emulation of ambient air conditions (e.g., 0 • C, 80% r.H.) and one for the emulation of room air conditions (e.g., 20 • C, 50% r.H.).…”

Section: System-level Optimization-refrigerant Cyclementioning

confidence: 99%

“…Based on the measurement results, the performance maps of the heating power and COP of the HPs were simulated depending on the power (speed/rpm) of the compressor and ambient air temperature (see Refs. [11,49] for the details of the refrigerant cycle model and also Refs. [11,12] for a detailed description of the test-rig specification including error propagation analysis).…”

Section: System-level Optimization-refrigerant Cyclementioning

confidence: 99%

“…[11,49] for the details of the refrigerant cycle model and also Refs. [11,12] for a detailed description of the test-rig specification including error propagation analysis). The refrigerant cycle was filled with R134a.…”

Section: System-level Optimization-refrigerant Cyclementioning

confidence: 99%

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Compact Decentral Façade-Integrated Air-to-Air Heat Pumps for Serial Renovation of Multi-Apartment Buildings

et al. 2022

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To address the huge market of renovation of multi-apartment buildings, minimal-invasive decentral serial-renovation solutions are required. One major challenge in the design of decentral heat pumps is to find the optimal balance between, on one hand, compactness and pleasant design, and on the other hand, efficiency and minimal sound emissions. A comprehensive holistic design and optimization process for the development of decentral heat pumps, from the component level, to the system level, and up to the building level, is developed. A novel façade-integrated speed-controlled exhaust air to supply air heat pump combined with a mechanical ventilation system with heat recovery and recirculation air was developed and simulated in a reference flat. Compared to a traditional supply air heat pump without recirculation, it shows only slight performance improvement, but allows significantly better thermal comfort and control, independently from the hygienic air flow rate and from the heating and cooling loads. Detailed measurement and simulation results are presented for several functional models with heating power of around 1 kW up to 2.5 kW. The design was optimized by means of CFD simulations to allow for low pressure drop, homogeneous flow, and low sound emissions. Moreover, mock-ups of innovative façade-integrated heat pump outdoor units are presented.

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Section: Review Of Compact Air-sourced Heat Pumps For Renovationmentioning

confidence: 95%