Abstract
Varying cooling load requirements in HVAC system become a major concern to many consumers because of the additional cost of electricity. The cooling load variation of HVAC system usually occurs when the domestic house door is frequently kept open for prolonged durations, which is particularly important in hot seasons. The present study, addresses a comparison of energy consumption due to the thermal disturbance during domestic house door  keep opened for various duration when the Variable Frequency Driver (VFD) and ON/OFF controllers are installed in HVAC system. The experiments are carried out in two identical houses during six warm days in a hot season where the outdoor temperatures have similar patterns throughout the days. The energy response of HVAC system is analysed incorporating the thermal and the electricity consumption data because of the change of the indoor temperature during opening of the house main door. The cost analysis is carried out and it is extended to include several repeats of door opening durations. It is the first time demonstrated that the energy consumption for HVAC system increases dramatically when the house main door is kept opened for several times in a day. The energy consumption and additional cost increase significantly for the case when the period of the main door opening is extended. In this case, VFD A/C controller unit achieves more energy savings than that of ON/OFF A/C controller unit.
Highlights
Air conditioning (A/C) is mainly utilized for maintaining thermal comfort in indoor environments, especially for hot and humid climate
A/C system is directly participating in increasing energy consumption due to the Saudi Arabia weather which is characterized with high temperature, humidity, and dust storms
The main door is kept open for 15 min, 30 min and 60 min respectively for the tests and analysis in line with regular practices of hot house of local area in Saudi Arabia
Summary
Air conditioning (A/C) is mainly utilized for maintaining thermal comfort in indoor environments, especially for hot and humid climate. It is considered to be one of the fastest growing energy sectors in Saudi Arabia. A/C system is directly participating in increasing energy consumption due to the Saudi Arabia weather which is characterized with high temperature, humidity, and dust storms. A temperature in Saudi Arabia follows the pattern of the desert climate, with the exception of the southwest. The climate change could make temperature raise high in summer days in the Arabian Gulf [1]. The higher outdoor temperature increases the demand for cooling over the years and the energy consumption. Several attempts have been made to improve thermal performance of cooling systems, such as air conditioning (A/C) units [3,4,5,6,7], it is the first time to consider the efficient operation of cooling systems under temporal thermal disturbance due to house main door opening for several durations
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