Fix DHW, heating, and cooling storage update bugs (issue #156)

[LorenzoBonanni]

Description

This pull request fixes multiple bugs in building.py related to incorrect energy calculations for thermal storage devices (DHW, heating, and cooling).
These bugs prevent correct storage charging/discharging behavior and can result in constant zero SOC values, especially for the DHW tank when heating_storage is disabled.

The changes correct the use of the appropriate storage device in the computation of energy flows and ensure consistent handling of the algorithm_action_based_time_step_hours_ratio factor.

Issue

Fixes: #156

Changes

This PR introduces the following fixes:

1. Fix in update_dhw_storage

Incorrect line:

energy = action * self.heating_storage.capacity * self.algorithm_action_based_time_step_hours_ratio

This prevented DHW storage from charging because heating_storage.capacity is 0 when heating storage is disabled.

Corrected to:

energy = action * self.dhw_storage.capacity * self.algorithm_action_based_time_step_hours_ratio

---

2. Fix in update_heating_storage

Incorrect line (used cooling storage):

energy = action * self.cooling_storage.capacity * self.algorithm_action_based_time_step_hours_ratio

Corrected to use the proper storage device:

energy = action * self.heating_storage.capacity * self.algorithm_action_based_time_step_hours_ratio

---

3. Fix in update_cooling_storage

Missing time-step scaling factor.
Previous code:

energy = action * self.cooling_storage.capacity

Corrected to:

energy = action * self.cooling_storage.capacity * self.algorithm_action_based_time_step_hours_ratio

Screenshots

Checklist

• I have tested the changes locally and they work as intended.
• I have updated the documentation, if applicable.
• I have added new tests, if applicable.
• I have followed the project's code style and conventions.

Additional notes