Optimization Analysis and Design of Solar Water Heating System by Lifecycle Cost Savings Method

2014 ◽  
Vol 644-650 ◽  
pp. 2428-2432
Author(s):  
Yu Bie ◽  
Si Ming Zheng ◽  
Ming Fu Hu ◽  
Wen Yuan Mao ◽  
Yong Fang
Keyword(s):  
Influence Factors ◽  
Cost Savings ◽  
Heating System ◽  
Water Heating ◽  
Solar Water Heating ◽  
Water Storage Tank ◽  
Analysis And Design ◽  
Solar Water ◽  
Solar Fraction ◽  
Solar Water Heating System

The objective of this work is to do theoretically investigation about the solar fraction changing laws affected by some factors, so that we can do optimization for solar system designing, specially for household solar water heating system. The calculation of solar fraction was established on a more effective day-to-day simulation model rather than traditional method. It is found that the collector area and the water storage tank volume are the main influence factors. Economic analysis by means of lifecycle cost savings evaluation was carried out based on the calculated model.

Time-of-Use Monitoring of U.S. Coast Guard Residential Water Heaters With and Without Solar Water Heating in Honolulu, HI

Solar Energy ◽  
2003 ◽  
Author(s):  
Andy Walker ◽  
Craig Christensen ◽  
Glen Yanagi
Keyword(s):  
Cost Savings ◽  
Cost Effective ◽  
Heating System ◽  
Coast Guard ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Water Heaters ◽  
Housing Area ◽  
Solar Water Heating System

A combination of high energy costs, uniform solar resource, and an active solar industry combine to make Hawaii a good location for cost effective applications of solar water heating. The non-freezing climate allows for simple solar water heating system designs. In the mild climate of Hawaii, solar water heating can displace a large fraction of a home’s electricity use since heating and cooling loads are small. In 1998, sixty-two solar water heaters were installed at Kiai Kai Hale US Coast Guard Housing Area in Honolulu, HI as a pilot project under a grant from the US DOE Federal Energy Management Program (FEMP). The systems are active, open loop systems with a single tank (electric water heater with the bottom element disabled). An assessment of these pilot units will help inform a Coast Guard decision regarding implementing solar water heating on the remaining 256 units in the housing area, and may be useful information for other government and utility programs. On 25 houses with solar water heating and 25 identical houses without solar, instruments were installed to measure on/off cycles of the electric water heaters and the tank outlet temperature. This paper describes the results the monitoring for a six week period From June 11 to July 25, 2002, with a statistical extrapolation to estimate annual savings. Demand savings are estimated at 1.62 kW/house, energy savings at 3,008 kWh/house/year, and annual cost savings per house is estimated at $380/year due to solar. For a system cost of $3,200 ($4,000 minus a $800 utility rebate) and a 25 year present worth factor of 17.1, the savings to investment ratio (SIR) is 2.03, so this solar water heating application is cost effective according to Federal regulation 10CFR436 (which requires SIR>1.0). The annual solar fraction is estimated at 74% and annual solar water heating system efficiency is estimated at 24%. This paper describes the statistical design of the survey; the measured load profiles; the energy, demand, and cost savings; and the observed condition of the systems. The paper includes a discussion of application of the International Performance Measurement and Verification Protocol (IPMVP) applied to renewable energy systems.

scholarly journals New Solar Water Heating System: Safety, Design and Implementation Issues

2018 ◽  
Vol 11 (1) ◽  
pp. 26-32
Author(s):  
Victor D. N. Santos ◽  
Manuel Cerveira ◽  
Fernando Moita
Keyword(s):  
Heating System ◽  
Water Heating ◽  
Heating Systems ◽  
Solar Water Heating ◽  
Water Storage Tank ◽  
Solar Water ◽  
Solar Water Heating System ◽  
Electronic Controller ◽  
Technical Solutions ◽  
System Prototype

Abstract This paper presents a new electronic controller, devoted to solar water heating systems, that implements safety functions to prevent L. pneumophila bacteria outbreaks. The controller uses data retrieved from strategically located probes in order to implement the proposed safety actions. The electronic solution was integrated and validated on a solar system prototype bench that uses real equipment such as collectors, a water storage tank and expansion vessels. Moreover, two particular solar water heating installations were designed devoted to a house family and a nursing home both located on the Mealhada area. The methodology and reported technical solutions in this research could be a practical guide to promote mass market usage of the solar water heating systems in Portugal.

Sign in / Sign up

Export Citation Format

Share Document