ASHRAE Journal - August 2019 - 30
TECHNICAL FEATURE
Combined Cooling
And Heating System
Performance in Hot and
Humid Climates
BY YOUSSEF RIACHI, PH.D.; MARC MADI
Waste heat refers to energy that is generated in processes without being put into beneficial use. Combined heat and power (CHP) systems have been widely used in largescale centralized power plants and industrial applications to produce simultaneous
power and heat, enhancing the overall system efficiency.1,2 Similarly, combined cooling and heating (CCH) systems provide simultaneous cooling and heating and hold
a great potential to be adopted in hotels, leisure facilities and industrial processes as
well as where a continuous and simultaneous demand for cooling/heating is mostly
present.3,4
Combined cooling and heating systems turned out to
be among the best means to improve a system's energy
efficiency, to reduce a system's operation cost and to
reduce greenhouse gas (GHG) emissions.5 Like waste
heat recovery systems in industry, CCH could be implemented at large scale in different sectors, but they are
constrained by factors such as the simultaneous need
for cooling and heating, the temperature of the cooling
or heating that should be delivered, the cost of equipment and energy sources. All these factors will determine the system's cost-effectiveness.
In a hotel application, a CCH system could benefit
from a full recovery potential, extending heat recovery
to lower and higher temperature regimes with moderate additional capital cost. The objective is to minimize
the initial costs and the overall costs for meeting simultaneous heating and cooling loads.
The study discussed in this article analyses technically and economically a combined cooling and
heating system at the Iconic Hotel at Old Doha Port
in Doha Port, Qatar, where both cooling and heating demands are of potential interest. The economic
Youssef Riachi, Ph.D., is a senior mechanical engineer, and Marc Madi is a senior mechanical engineer at Dar Al-Handasah, in Beirut, Lebanon.
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ASHRAE Journal - August 2019
Table of Contents for the Digital Edition of ASHRAE Journal - August 2019
Contents
ASHRAE Journal - August 2019 - Intro
ASHRAE Journal - August 2019 - Cover1
ASHRAE Journal - August 2019 - Cover2
ASHRAE Journal - August 2019 - 1
ASHRAE Journal - August 2019 - Contents
ASHRAE Journal - August 2019 - 3
ASHRAE Journal - August 2019 - 4
ASHRAE Journal - August 2019 - 5
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ASHRAE Journal - August 2019 - Cover3
ASHRAE Journal - August 2019 - Cover4
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