Home │Sitemap

WP5 - Storage (Deliverable 5.2)

The full report is confidential and will not be distributed to the public. However, a brief summary of the contents are given here.

Based on the analysis from phase 1 of the project, reported in D5.1, 10 breakthroughs and three important, but well known and not often implement system improvements, were simulated in order to quantify the energy savings compared to the reference systems. Additionally the costs of the improvements were estimated and the cost-benefit calculated according to the MacSheep methodology outlined in report D7.2. 44 variations in total were simulated. Of these 23 gave a cost-benefit ranging from zero up to € 33 per year. The largest electric energy saving was 230 kWh/year (6.4 %) compared to the benchmark system while still achieving a cost benefit. The following breakthroughs were studied using this methodology:

  • Vacuum insulation
  • Heat traps and reduced pipe lengths for compact system design
  • Integration of heat pump condenser into the store
  • Storage concept for two stage heat pump
  • External domestic hot water module
  • Strategies for optimum stratification within the storage tank
  •  Insulation of DHW section from SH section of the combistore
  • Use of high efficiency pumps in combination with external heat exchangers instead of internal heat exchangers for DHW, as well as for solar circuit and space heat distribution
  • Use of 4-way valve for SH with and without stratification device
  • Influence of the use of average temperature measurement instead of single point measurements
  • Different small cold heat storage concepts for water/ice including different methods of containing the PCM and heat exchanger configurations
  • Pressurised and pressureless plastic tanks for water based storage

The savings for breakthroughs in storage, even for the best ones, are relatively small, but when added together amount to a very large saving. Whether these savings are additive or not has, however, not yet been tested.

Based on these results the following breakthroughs will be further investigated in phase 3 of the project:

  • Vacuum insulation
  •  Heat traps and reduced pipe lengths for compact system design
  • Integration of the heat pump condenser into the store
  • Storage concept for two stage heat pump
  •  External domestic hot water module

Back...

© 2015 Institut für Solartechnik · Oberseestrasse 10 · CH-8640 Rapperswil · Tel. +41 55 222 48 21 · infonospam@nospam spf.ch | Impressum