Research brief / Version 1.0
Read geothermal case studies at the right scale
Use DOE’s expanding case-study library to frame a project investigation—not to invent a fluid-performance claim.
What is new in the source collection
DOE’s geothermal publications directory lists a heat-pump case-study collection introduced in 2024 and expanded in late 2025. It spans installations in different climate zones and system configurations. The directory is a useful starting point for finding projects with relevant conditions.
This brief reviews the directory’s scope, not the measurements in every underlying study. No energy-saving percentage or Alliance product-performance claim is inferred from it.
Build a transferability record
Our suggested next step is to select one relevant project and record its system boundary, climate, loads, comparison baseline and measurement period. Note whether results are measured or modeled and which operating conditions differ from your site.
Then separate system-level evidence from fluid-level evidence. A successful installation can motivate investigation of a similar system; it does not qualify a different fluid, concentration, ground-loop design or maintenance practice.
- Which project conditions resemble the proposed installation?
- Does the reported outcome include pumping and auxiliary loads?
- What fluid and operating data are actually disclosed?
- What remains a hypothesis requiring local engineering validation?
Requirement → evidence → decision boundary
An editorial checklist for your review—not a table of product specifications.
| Requirement | Evidence to request | What it does not establish |
|---|---|---|
| Research relevance | Study identifier, date, system boundary and baseline | A directory listing is not an independent study review. |
| Performance comparison | Measurement period, operating conditions and included energy loads | Results from one installation are not a guaranteed saving. |
| Purchasing consequence | Explicit requirement changed by the evidence and its approver | Research interest is not product qualification. |
Make the open questions useful
Record requirements, evidence gaps and approval owners in a downloadable purchasing brief.
Open the requirements worksheet →Revision record
1.0 · September 10, 2026 — Initial source-based edition. No original testing or product qualification is claimed.
For engineering and purchasing teams defining closed-loop fluid requirements. This collection does not size a ground loop, prescribe a concentration, or approve a substitution.
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