Sizing domestic air-source heat pump systems with thermal storage under varying electrical load shifting strategies

Dashamir Marini,Richard A Buswell,Christina J Hopfe

doi:10.1016/j.apenergy.2019.113811

Dashamir Marini, Richard A Buswell + Show 1 more

Open Access

https://doi.org/10.1016/j.apenergy.2019.113811

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Journal: Applied Energy	Publication Date: Sep 18, 2019
Citations: 22	License type: cc-by

Affiliation: Loughborough University

Abstract

The demand for local heat storage to help manage energy demand in dwellings is likely to increase as the electrification of heat through heat pumps becomes more widespread. Sizing thermal energy storage systems has been an important topic in contemporary literature, but the effect of the electrical load shifting tariff and the service the householder receives in terms of space-heating and hot water delivered, however, has not and this is particularly important when households transition from conventional gas fired to low carbon technologies. This paper takes a whole system modelling approach to understand the impact of user demand patterns and load shifting scenarios on the volume of energy storage required for a heat-pump installation. The work uses monitoring data from several family homes to drive the simulation and finds that the level of service the householder receives is sensitive to their patterns of consumption, thermal energy storage volume and the electricity tariff, with some households being far more sensitive to tariff choice than others. The paper introduces a novel, quantifiable measure of service for space-heating and hot water systems that can be incorporated into thermal energy storage sizing procedures.

Highlights

Reducing energy consumption and greenhouse gas emissions is one of the key challenges of our generation
The service provided by the existing space heating and hot water system are presented in Figs. 4 and 5
A detailed dynamic thermal and system simulation of five dwellings was developed in order to evaluate the impact on the space-heating and hot water service householders might expect to receive when they move from gas fired condensing combination boilers to an ASHP and Thermal Energy Storage (TES) system

Summary

Introduction

Reducing energy consumption and greenhouse gas emissions is one of the key challenges of our generation. The reduction of emissions and energy consumption is expected to be achieved by improving insulation levels to reduce the heating demand of buildings [4] alongside schemes to encourage the move towards the adoption of local electricity generation and low-carbon technologies [5]. The need for increasing flexibility in demand is understood [6]: the electrification of heat through the uptake of heat-pump systems could substantially increase the electrical load in low-voltage distribution systems [7], being more problematic than the introduction of PV [8], creating a challenge for both the capacity [9] and stability of the grid [10]. Building owners are likely to be encouraged to participate in the provision of flexible demand and to transition from conventional to low carbon technologies for the provision of heat

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