Energy assessment of hybrid heat pump systems as a retrofit measure in residential housing stock

Hybrid electric-gas heat pump systems are a possible retrofit option in older residential buildings. Older buildings can be challenging to retrofit and in this context hybrid systems can offer an intermediate route to decarbonisation of building heating energy demand. This is especially the case, where deep retrofit measures coupled with monovalent electric heat pump systems may not be feasible from an economic perspective. The aim of the current paper is to examine the suitability of a hybrid electric-gas heat pump system in comparison to electric heat pump systems as a retrofit measure for Irish housing stock and to benchmark both options against existing fossil fuel baseline systems. A detailed building energy model of a residential dwelling was developed and calibrated to within acceptable ASHRAE standards. An energy assessment was carried out which investigates each retrofit scenario. Key findings include: (i) both the all-electric and hybrid heat pump systems deliver primary energy savings compared to the fossil fuel baseline systems, (ii) hybrid systems attain higher primary energy savings compared to all-electric heat pump, where the hybrid system incorporates flexible delivery temperatures compared to a fixed delivery temperature tor the all-electric heat pump system.

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A Regional Comparison of Solar, Heat Pump, and Solar-Heat Pump Systems

Journal of Solar Energy Engineering ◽

10.1115/1.3266297 ◽

1982 ◽

Vol 104 (3) ◽

pp. 158-164 ◽

Cited By ~ 6

Author(s):

B. E. Manton ◽

J. W. Mitchell

Keyword(s):

United States ◽

Heat Pump ◽

Energy Savings ◽

The United States ◽

Primary Energy ◽

Total System ◽

Pump System ◽

Heat Pump System ◽

Solar Heat ◽

Alternative System

A comparative study of the thermal and economic performance of the parallel and series solar-heat pump systems, stand-alone solar, and stand-alone heat pump systems for residential space and domestic hot water heating has been undertaken for the United States using FCHART 4.0 [1]. The results are useful for a regional assessment of the viability of the different systems, and for assessing policies that will encourage the implementation of the most energy efficient system. The magnitude of the potential energy savings was determined for each system on the basis of an equal total system cost in the case of the series, parallel, and solar systems. The cost was governed by current federal tax credits, and found to be 10,000 dollars. The size and cost of the heat pump are the same in the series, parallel, and stand-alone heat pump systems. A line can be drawn across the United States north of which the parallel heat pump system saves the most energy, and south of which the solar system saves the most. The better of either the solar or the parallel systems consistently used less energy than either stand-alone heat pump or series systems for all locations. The conventional oil or gas furnace seasonal efficiency which would be required to save as much primary energy as the better alternative system was identified regionally. In all but the northern portions of the United States, conventional furnaces would use more primary energy than the better alternative system. The price that the solar collector in the series heat pump system would have to be so that a larger collection system could be installed and the series system would match the energy savings of the preferred system, whether solar or parallel heat pump, was calculated. This price was one-half to two-thirds of current collector prices. The break-even electricity price was determined which is the price below which the life cycle savings of the alternative system are positive. The better alternative was found to be economic against oil furnaces in all regions of the U.S., but economic against gas furnaces only in the Southwest.

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Energy savings potential of a desiccant assisted hybrid air source heat pump system for residential building in hot summer and cold winter zone in China

Energy and Buildings ◽

10.1016/j.enbuild.2011.09.021 ◽

2011 ◽

Vol 43 (12) ◽

pp. 3521-3527 ◽

Cited By ~ 23

Author(s):

Fenghua Ge ◽

Xinglong Guo ◽

Zicheng Hu ◽

Yi Chu

Keyword(s):

Heat Pump ◽

Energy Savings ◽

Residential Building ◽

Cold Winter ◽

Pump System ◽

Heat Pump System ◽

Air Source Heat Pump

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Modeling of a Smart Heat Pump Made of Laminated Thermoelectric and Electrocaloric Materials

Journal of Electronic Packaging ◽

10.1115/1.4034751 ◽

2016 ◽

Vol 138 (4) ◽

Cited By ~ 7

Author(s):

Dudong Feng ◽

Shi-Chune Yao ◽

Tian Zhang ◽

Qiming Zhang

Keyword(s):

Heat Pump ◽

Temperature Difference ◽

Coefficient Of Performance ◽

Pump System ◽

Laminated Structure ◽

Heat Pump System ◽

Simple Arrangement ◽

Parametric Effects ◽

Hybrid Heat Pump ◽

Physical Features

In this study, a smart heat pump, which could be used for the cooling of electronics, made of laminated structure of thermoelectric (TE) and electrocaloric (EC) materials, is studied. A simple arrangement of two TE layers sandwiched with one EC layer is modeled. This smart heat pump utilized the newly developed EC materials of giant adiabatic temperature change and the TE materials of high figure of merit. The system has the advantages of no moving parts, made of solid state, operable over large working temperature difference, and can be formed into very small size. The operation of the device is numerically modeled considering the three major parametric effects: EC operation as a function of time, electric current applied on TE, and temperature difference between the hot and cold sinks. The results on coefficient of performance (COP) and heat flow per unit area are discussed. This study is performed as an early attempt of analyzing the basic physical features of TE–EC–TE laminated structure heat pump and extends the understanding by further discussing the tradeoff between lower COP and larger overall temperature difference coverage in the TE/EC hybrid heat pump system with multilaminated structure.

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Energy assessment of solar technologies coupled with a ground source heat pump system for residential energy supply in Southern European climates

Energy ◽

10.1016/j.energy.2015.08.040 ◽

2015 ◽

Vol 91 ◽

pp. 294-305 ◽

Cited By ~ 40

Author(s):

Francesco Reda ◽

Natale Arcuri ◽

Pasquale Loiacono ◽

Domenico Mazzeo

Keyword(s):

Heat Pump ◽

Energy Supply ◽

Ground Source Heat Pump ◽

Residential Energy ◽

Pump System ◽

Heat Pump System ◽

Energy Assessment ◽

Ground Source

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Solar Assisted Heat Pump System for Floor Heating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.354-355.828 ◽

2011 ◽

Vol 354-355 ◽

pp. 828-832

Author(s):

Xi Ming Zhang ◽

Dong Hui Pan ◽

Qing Bo Zhang

Keyword(s):

Heat Pump ◽

Heating System ◽

Primary Energy ◽

Conventional System ◽

Pump System ◽

Storage Container ◽

Heat Pump System ◽

Gas Heating ◽

Supply Systems ◽

Floor Heating

Solar assisted heat pump system(SAHP) has a wide and wonderful future for its excellent performance in energy saving and environment protection. Solar assisted heat pump system for floor heating is combined by solar assisted heat pump and floor heating. Presents the operating principal and key equipments and designs solar collector, thermal storage container, floor-coil radiator and so on， discusses the feasibility of introduction of a combined heating system for an energy building in Qingdao. On the base of this, two types of energy supply systems, the conventional system(gas heating and SAHP system, were set. Those two types of systems were evaluated regarding energy efficiency and environmental load. According to the results, compared with the conventional system, SAHP system was capable of reducing the primary energy consumption and CO2 emission, respectively 20% and 19.2%.

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