A computational model of a domestic solar heating system with underground spherical thermal storage

Seasonal thermal energy storage with heat pumps and low temperatures in building projects—A comparative review

“…[120,45,57,62,121,122], that have conducted sensitivity analyses to investigate which factor has the most influence on efficiency of the system. Increasing storage capacity would cause higher temperature during winter time and lower temperature during summer time [57,121,122] in the storage. This would be favourable for the COP of a heat pump during the heating season.…”

A thermo-economical optimization of a domestic solar heating plant with seasonal storage

“…Solar energy absorbed by the solar collectors is transferred to storage tank in the ground during the whole year. The heat pump operates only when the temperature of the water in the tank is in sufficient to keep the house at the required inside design air temperature [5].…”

Modeling of a space cooling system with underground storage

“…The ratio of the actual COP of a heat pump and the ideal COP is defined as the Carnot efficiency ratio, which will be calculated using the approach given by Tarnawski [10], and _ Inallı et al [11]: Table 1 The highest monthly average outside air temperature, and heating and cooling degree-days for Gaziantep [16] Months January …”