| Autor: |
Khoa Xuan Le, Ming Jun Huang, Shah, Nikhilkumar N., Wilson, Christopher, Hewitt, Neil J. |
| Jazyk: |
angličtina |
| Předmět: |
|
| Popis: |
Cascade air-to-water heat pumps have good potential for retrofitting UK domestic buildings because they can directly replace existing fossil-fuel boilers without the requirement of considerable modification to the heat distribution systems, which is likely with single-stage heat pumps. However, a widespread uptake of these heat pumps would pose challenges for the grid. This paper presents a load shifting study for these heat pumps coupled with thermal energy storage to avoid peak demand periods. The operation of the heat pump was constrained to off-peak hours identified by an available electricity tariff. How and when the heat pump and the storage were operated interactively to obtain high system efficiency with minimized running costs was investigated. TRNSYS simulation software was used to simulate the system performance which has been validated against experimental results. Northern Ireland (UK) was selected as the evaluated scenario. Simulation results showed that the tank temperature set point of 75 °C with the hot water tank size of 1.2 m3 can wholly shift electrical heating demand to off-peak periods. The optimal times to start the heat pump to charge the storage were at 3 am and 2 pm for the morning and afternoon heating demand, respectively. The optimized load shifting strategy could help the heat pump to obtain running cost and carbon emissions savings compared to oil boilers. This indicates that the optimized load shifting could help increase the retrofit rates of these heat pumps into off-gas grid areas where existing residential buildings are heavily relying on oil boilers. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
