1. Photos
<
Aerial phoo Solar Hot Water Plant in a Hotel Complex in Tsimshatsui
| Case Study Index |
2. Heat recovery and solar energy
regent01.jpg 67.91 Kb |
regent02.jpg 63.08 Kb |
regent03.jpg 63.17 Kb |
regent04.jpg 61.86 Kb |
regent05.jpg 56.76 Kb |
regent06.jpg 63.44 Kb |
regent07.jpg 71.45 Kb |
regent08.jpg 63.93 Kb |
regent09.jpg 55.20 Kb |
regent10.jpg 55.27 Kb |
regent11.jpg 64.06 Kb |
regent12.jpg 62.30 Kb |
regent13.jpg 59.47 Kb |
regent14.jpg 67.47 Kb |
regent15.jpg 54.70 Kb |
regent16.jpg 56.28 Kb |
Total 280 plates of solar collectors (each plate has an area of 900 mm x 2130 mm).
(* Special thanks are expressed to Mr. K. H. Kwok, Chief Engineer of the Hotel for arranging the visit.)
2. Heat recovery and solar energy
[extracted from Building Journal Hongkong, July 1977, pp. 28-29]
"The forced hot water system in this project feeding the air conditioning heating coils and pre-heating the domestic hot water systems, utilizes the heat extracted from the building through the air conditioning systems.
Solar energy is used to supplment the heating requirement of the domestic hot water system. Any insufficient heat requirement will be supplemented by heat exchangers, using hot water from electric boilers as their heating source.
The heat extracted and recovered amounts to approximately 45 million Btu/hr (13.2 MW). Whereas the solar panels located on the roof of the office building will absorb approximately 1.5 million Btu/hr (0.44 MW), which would raise the pre-heated domestic water temperature from 90 degrees F (32.2 degrees C) to 104 degrees F (40 degrees C).
It appears that the amount of heat recovered is more than adequate for the building heating requirements, which is 22 million Btu/hr, and the remaining recovered heat is also adequate in pre-heating the domestic water from 60 degrees F (15.6 degrees C) to 90 degrees F (32.2 degrees C) (approximately 10 million Btu/hr (2.93 MW) is required). However, due to the requirements of domestic hot water temperature which is either higher than or equal to the maximum condenser water temperature available and the fact that when the building cooling load is at minimum condition only one machine may be operating, then the heat extracted would only be approximately 17 million Btu/hr (4.98 MW), hence, two electric hot water boilers having a total output of 20 million Btu/hr (10 mW) are provided in this project to make up the heat balance.
It is obvious that solar energy usage on this project still only plays a little part because of cost and plant space considerations at the time of designing. The fact that a good engineering design must also be economically justified dictates the designer's choice. However, as we are all energy conscious today, and as cheaper solar products are being developed and produced each day due to vast improvement in the relevant technology, one can see more solar energy applications as times goes on."
| Case Study Index
|
| Created: 20 Jan 1999 | Update: 4 Apr 2000 | By: Sam C M Hui (cmhui@hku.hk) |