Final deliverable report on Heat Rejection Systems for solar cooling
Appendix presenting the Heat rejection database
January 2016 - XLS 1.27MB
Editor: Roberto Fedrizzi (EURAC)
Publisher: Daniel Mugnier (TECSOL)

This document is the appendix of the Final report on Heat Rejection Systems for solar cooling. It is a database presenting the different collected information on heat rejection devices

Final Report on Pumps Efficiency and Adaptability
Task 48 - A4 activity final report
December 2015 - PDF 4.03MB
Editor: Martin Helm, ZAE Bayern
Publisher: Daniel Mugnier
Subtask A concentrates on developing tools and deliverables permitting to show the level of quality of the most critical components of the solar cooling and heating system. These components are mainly the chiller, the heat rejection device, the pumps and the solar collectors. This technical report focuses on pump efficiency and adaptability to part load conditions in order to minimize the electricity consumption in the hydraulic circuits to obtain a high seasonal energy efficiency ratio in solar cooling systems. In a first step a selection of market available chillers is evaluated by manufacturer design data concerning temperature differences, flow rates and pressure drops of the external hydraulic circuits and the resulting auxiliary energy electricity consumption to overcome the friction losses in the heat exchangers. While the EER for the chiller solely varies between 11.9 and 77.6 some market available chillers inherently impede good seasonal performance of the overall SHC-System. Subsequently the different hydraulic circuits of several measured solar cooling systems are analyzed concerning their portion on the overall seasonal electricity consumption. Typically more than 50 % of the auxiliaries are caused by the heat rejection system including cooling water pumps and fan. A short observation of the portion of pump costs in SHC-Systems confirms the almost negligible impact on overall investment costs and absence of meaningful cost-saving opportunities. Furthermore due to substantially reduced operation costs high-efficiency pumps help to reduce operational costs. But the deployment of high-efficiency pumps in solar cooling installations does not implicate an efficient pumping automatically. The strong relationship between pump and plant curve demands a proper system design and pump selection. The way things are an overall SEER of 20 for well-designed small scale solar cooling systems and more seems to be feasible. Specific Objectives A state of the art analysis will be conducted on this component in close cooperation with ongoing IEA-SHC Tasks 44 and 45, where these issues are tackled as well. Furthermore the design criterions of market available chillers concerning temperature levels and pressure drop in the heat exchangers are assessed. In addition to that a performance coefficient called Auxiliary Energy Consumption Ratio (AECR) for the overall hydraulic efficiency is introduced in order to compare the design of various hydraulic circuits of SHC-systems in different capacity classes. A short theoretical introduction into the rotodynamic pump design helps to avoid planning errors, adverse duty points and simplifies a correct pump selection. A particular focus will be addressed to the adaptability of the technology to part load production conditions. Finally an investigation will be done on the best practices for electric consumption reduction for pumping in the different hydraulic loops of a solar cooling system. Best practice will be valorized always including the compromise between efficiency and simplicity

Final report on State of the art on new collectors & characterization for solar cooling
Task48 - Activity A6 Final Report
December 2015 - PDF 0.42MB
Editor: Marco Calderoni
Publisher: Daniel Mugnier
An extensive market overview of existing concentrating collectors has been conducted so as to create easy to consult database (like the existing Solar Key mark one for certified collectors). This database has been periodically updated during IEA Task 48 work and extended with information relating the certification process of such collectors. Concentrating collectors can nowadays be tested according to several standards (see also Kramer, Mehnert et al. 2011), the most important and enhanced one (also basis for certification according Keymark, SRCC, and others) is (Norm ISO 9806:2013[E]). New components and approaches, currently under development, have been included into the survey and their use in existing solar cooling plants has been investigated

Final report on State of the art on new collectors & characterization for solar cooling : appendix with Collector database
Task48 - Activity A6 Final Report appendix
December 2015 - XLS 0.01MB - Posted: 3/22/2015
By: Marco Calderoni
Editor: Marco Calderoni
Publisher: Daniel Mugnier

This document is the appendix of the Final report on State of the art on new collectors & characterization. It is a database presenting the different collected information on new collector models

Chiller Characterization
Final A1 Deliverable Report
September 2015 - PDF 1.36MB
Editor: Salvatore Vasta (CNR), Francois Boudehenn (CEA), Roberto Fedrizzi (EURAC), Jochen Doell (FhG ISE)
Publisher: Daniel Mugnier (TECSOL)
The objective of Subtask A1 is to supply the tools necessary for assessing the quality level of the sorption chillers installed in solar cooling plants. Particular attention has been given therefore to all those methods able to characterize the chillers at off-design conditions and during the transitory phases typical for these kind of applications. With this regard, two test procedures aimed at the “mapping” of the chillers at full load and at partial load and able to provide specific provisions on the basis of their operation (i.e. continuous and discontinuous) have been developed. The expected result is to achieve reliable data, coming from laboratory tests, that can be used as input for calculation methods for the seasonal performance evaluation of the chillers, like the BIN METHOD, or as input for the development of numerical models able to simulate their behavior on annual basis within specific boundaries. For their drafting, the testing protocols available on the dedicated normative scenario and according to the current criteria of the Eco-design and the Eco-labeling directives have been used as reference. The present final report deals with these two test procedures and includes the approach used for their drafting, the description of the test protocols in terms of rating conditions, testing methodology and the testing apparatus, and the results obtained from the first attempt of validation of the developed test procedures.

Final deliverable report on Heat Rejection Systems for solar cooling
Task 48 - Final Activity report A3
January 2014 - PDF 3.63MB
Editor: Roberto Fedrizzi
SHC Task 48 Subtask A concentrates on developing tools and deliverables to show the level of quality of the most critical components of the solar cooling and heating system. These components are mainly the chiller, the heat rejection device, the pumps and the solar collectors. This report gives an overview of existing and novel concepts for heat rejection devices in solar cooling systems and recommendations on which heat rejection measure should be used under different boundary conditions (climate, system concept etc.) while achieving the 2 main objectives: 1) investment & operation costs minimization 2) re-cooling performance and efficiency. For selected components, where it was possible, a performance characterization has been made in partnership with manufacturers.