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Adeyemi, B S and Aigbavboa, C O (2020) Conflict factors investigation among construction professionals in Nigeria. Journal of Engineering, Design and Technology , 18(05), 1121–37.

Aghimien, D O, Aigbavboa, C O, Oke, A E and Thwala, W D (2019) Mapping out research focus for robotics and automation research in construction-related studies. Journal of Engineering, Design and Technology , 18(05), 1063–79.

Agyekum, K, Adinyira, E, Baiden, B, Ampratwum, G and Duah, D (2019) Barriers to the adoption of green certification of buildings. Journal of Engineering, Design and Technology , 17(05), 1035–55.

Al-Saeed, Y, Parn, E, Edwards, D J and Scaysbrook, S (2019) A conceptual framework for utilising BIM digital objects (BDO) in manufacturing design and production. Journal of Engineering, Design and Technology , 17(05), 960–84.

Arowoiya, V A, Oke, A E, Aigbavboa, C O and Aliu, J (2020) An appraisal of the adoption internet of things (IoT) elements for sustainable construction. Journal of Engineering, Design and Technology, 18(05), 1193–208.

Asad, M M, Hassan, R B, Sherwani, F, Rind, I A and Maiji, Y (2019) Development of a novel safety and health educational management information system (HAZ-PRO) for oil and gas production operation. Journal of Engineering, Design and Technology , 18(05), 959–71.

Babatunde, S O, Ekundayo, D, Babalola, O and Jimoh, J A (2018) Analysis of the drivers and benefits of BIM incorporation into quantity surveying profession. Journal of Engineering, Design and Technology, 16(05), 750–66.

Blindheim, J, Elverum, C W, Welo, T and Steinert, M (2020) Concept evaluation in new product development. Journal of Engineering, Design and Technology , 18(05), 1139–51.

Borer, J (2020) Object oriented design of safety critical programmable equipment systems. Journal of Engineering, Design and Technology , 18(05), 1081–9.

Chaparro, D A, Ying, F J, Rotimi, F E and Egbelakin, T (2020) Commute and labour productivity: investigation of inner city construction sites. Journal of Engineering, Design and Technology , 18(05), 1305–19.

Dave, N, Sahu, V and Misra, A K (2020) Development of geopolymer cement concrete for highway infrastructure applications. Journal of Engineering, Design and Technology , 18(05), 1321–33.

Davila Delgado, J M and Oyedele, L O (2020) BIM data model requirements for asset monitoring and the circular economy. Journal of Engineering, Design and Technology , 18(05), 1269–85.

Derradji, R and Hamzi, R (2020) Multi-criterion analysis based on integrated process-risk optimization. Journal of Engineering, Design and Technology , 18(05), 1015–35.

Dosumu, O and Aigbavboa, C O (2018) Adoption of light steel (LS) for building projects in South Africa. Journal of Engineering, Design and Technology, 16(05), 711–33.

Eziefula, U G, Opara, H E and Eziefula, B I (2020) Strength of concrete produced with different sources of aggregates from selected parts of Abia and Imo States of Nigeria. Journal of Engineering, Design and Technology , 18(05), 1053–61.

Fei, C, Xiahou, P and Wang, F (2020) Design and control of grid connected inverter for harmonic suppression. Journal of Engineering, Design and Technology , 18(05), 1349–56.

Gamil, Y and Rahman, I A R (2019) Awareness and challenges of building information modelling (BIM) implementation in the Yemen construction industry. Journal of Engineering, Design and Technology , 17(05), 1077–84.

Gamil, Y, A. Abdullah, M, Abd Rahman, I and Asad, M M (2020) Internet of things in construction industry revolution 4.0. Journal of Engineering, Design and Technology , 18(05), 1091–102.

Gbadamosi, S L and Nwulu, N I (2020) Optimal planning of renewable energy systems for power loss reduction in transmission expansion planning. Journal of Engineering, Design and Technology , 18(05), 1209–22.

Gharehbaghi, K, McManus, K, Hurst, N, Robson, K and Myers, M (2019) Complexities in mega rail transportation projects. Journal of Engineering, Design and Technology , 18(05), 973–90.

Gupta, N K and Thakre, G D (2020) Dry sliding wear performance on self-healing Al6061 composites. Journal of Engineering, Design and Technology , 18(05), 1357–70.

He, W, Shi, Y and Kong, D (2019) Construction of a 5D duration and cost optimisation model based on genetic algorithm and BIM. Journal of Engineering, Design and Technology , 17(05), 929–42.

Hussin, M H, Othman, N H and Wan Ibrahim, M H (2019) Carbonation of concrete containing mussel (Perna viridis) shell ash. Journal of Engineering, Design and Technology , 17(05), 904–28.

Jun, Z, Akbar, M A and Xin lei, W (2020) Optimization of design and measurement principle of six-components force/thrust measurement stand. Journal of Engineering, Design and Technology , 18(05), 1371–9.

Khamseh, A and Marei, P (2020) Designing a model developed to assess the capabilities of technological innovation in Iranian construction of power plant equipment industries. Journal of Engineering, Design and Technology , 18(05), 1241–9.

Kissi, E, Ahadzie, D K, Adjei-Kumi, T and Badu, E (2017) Rethinking the challenges to the pricing of projects in the Ghanaian construction industry. Journal of Engineering, Design and Technology, 15(05), 700-19.

Koranteng, C, Simons, B and Essel, C (2019) Climate responsive buildings: a comfort assessment of buildings on KNUST campus, Kumasi. Journal of Engineering, Design and Technology , 17(05), 862–77.

Li, H, Xia, Q, Wang, L and Ma, Y (2020) Sustainability assessment of urban water environment treatment public-private partnership projects using fuzzy logic. Journal of Engineering, Design and Technology , 18(05), 1251–67.

Maina, W and van Graan, A (2017) Identifying path-breaking transitions for Kenya’s marginalised communities in water and sanitation provision. Journal of Engineering, Design and Technology, 15(05), 689-99.

Mbae, A M and Nwulu, N I (2020) Day-ahead load forecasting using improved grey Verhulst model. Journal of Engineering, Design and Technology , 18(05), 1335–48.

Ogunsina, O, Ekwus Obiegbu, M and Adeniyi, O (2018) Factors confronting quantity surveying practice: the case of Nigeria. Journal of Engineering, Design and Technology, 16(05), 767–82.

Okampo, E J and Nwulu, N I (2020) Optimal energy mix for a reverse osmosis desalination unit considering demand response. Journal of Engineering, Design and Technology , 18(05), 1287–303.

Oke, A E, Aigbavboa, C O and Raphiri, M M (2017) Students’ satisfaction with hostel accommodations in higher education institutions. Journal of Engineering, Design and Technology, 15(05), 652-66.

Okojie, D E, Jimoh, A A, Hamam, Y and Yusuff, A A (2019) Optimal capacity utilisation of transmission lines network in power flow operations: a survey. Journal of Engineering, Design and Technology , 17(05), 1056–76.

Olatunde, N A and Alao, O O (2017) Quantitative appraisal of cost and time performance of construction projects in public and private universities in Osun State, Nigeria. Journal of Engineering, Design and Technology, 15(05), 619-34.

Osman, B and Zhu, H (2020) A virtual educational model on a CNC milling machine including and excluding two methods of fuzzy controllers. Journal of Engineering, Design and Technology , 18(05), 1153–63.

Owusu-Manu, D, Asiedu, R O, Edwards, D J, Donkor-Hyiaman, K, Abuntori, P A and El-Gohary, H (2019) An assessment of mortgage loan default propensity in Ghana. Journal of Engineering, Design and Technology , 17(05), 985–1017.

Poghosyan, A, Manu, P, Mahdjoubi, L, Gibb, A G F, Behm, M and Mahamadu, A (2018) Design for safety implementation factors: a literature review. Journal of Engineering, Design and Technology, 16(05), 783–97.

Pornthepkasemsant, P and Charoenpornpattana, S (2019) Identification of factors affecting productivity in Thailand’s construction industry and proposed maturity model for improvement of the productivity. Journal of Engineering, Design and Technology , 17(05), 849–61.

Rajabion, L, Wakil, K, Badfar, A, Mojtabavi Naeini, S and Zareie, B (2019) A new model for assessing the impact of ICT and digital knowledge on students’ thoughts and beliefs. Journal of Engineering, Design and Technology , 17(05), 943–59.

Santhosh, C (2019) Impact of determinants on early internationalization. Journal of Engineering, Design and Technology , 17(05), 1018–34.

Shurrab, J and Hussain, M (2018) An empirical study of the impact of lean on the performance of the construction industry in UAE. Journal of Engineering, Design and Technology, 16(05), 694–710.

Sibanda, V, Mpofu, K, Trimble, J and Kanganga, M (2019) Development of part families for a reconfigurable machine. Journal of Engineering, Design and Technology , 18(05), 991–1014.

Singh, E and Singh, D P (2017) Architectural profession in India: perception towards service marketing. Journal of Engineering, Design and Technology, 15(05), 574-90.

Singh, T, Kalra, M and Misra, A K (2020) Simplified probabilistic seismic assessment of dampers in tall and braced structures in buildings. Journal of Engineering, Design and Technology , 18(05), 1037–52.

Soleimani, M and Shahandashti, M (2017) Comparative process-based life-cycle assessment of bioconcrete and conventional concrete. Journal of Engineering, Design and Technology, 15(05), 667-88.

Tangwe, S L and Simon, M (2018) Impact of standby losses and isotherm blanket contributions on the hot water cylinders of various heating technologies. Journal of Engineering, Design and Technology, 16(05), 798–810.

  • Type: Journal Article
  • Keywords: ASHP-Air source heat pump; Isotherm blanket; Multiple comparison tests; Significant mean difference; Standby thermal energy losses;
  • ISBN/ISSN: 1726-0531
  • URL: https://doi.org/10.1108/JEDT-06-2017-0055
  • Abstract:
    The purpose of this paper is fourfold: to experimentally determine the standby thermal energy losses in various hot water cylinders in both scenarios, without isotherm blanket installation and with isotherm blanket installation; to analytically evaluate the performance of either the geyser, split- or integrated-type ASHP water heaters based on the number of heating up cycles and total electrical energy consumptions over a 24-h period without isotherm blankets and with isotherm blankets installed; to demonstrate the impact of the electrical energy factors of the split- and integrated-type ASHP water heaters under both the scenarios (without and with the isotherm blankets installed); and to use statistical tests (one way ANOVA and multiple comparison procedure tests) to verify whether any significant difference in the standby thermal energy losses occurred for each of the heating devices under both the scenarios. Design/methodology/approach The methodology was divided into monitoring of the performance of the electrical energy consumptions and ambient conditions of the hot water heating technologies without isotherm blanket installation and with isotherm blanket installation. Findings The results reveal that the average standby thermal energy loss of the geyser without the installation of an isotherm blanket was 2.5 kWh. And this standby loss can be reduced to over 18.5 per cent by just installing a 40-mm thick isotherm blanket on the tank. The statistical tests show a significant mean difference in the group electrical energy consumed to compensate for the standby losses under both scenarios. In contrast, the average standby thermal energy losses for the split- and integrated-type ASHP water heaters were 1.33 kWh and 0.92 kWh, respectively. There was a reduction of 15.5 per cent and 3.5 per cent in the electrical energy consumed in compensating for standby losses for both the split and integrated types, respectively, but there was no significant mean difference in the standby losses under both scenarios for the two systems. Again, without any loss of generality, the electrical energy factor of both the ASHP water heaters decreased upon installation of the isotherm blanks. Research limitations/implications The experiments were conducted only for a 150-L geyser and 150-L split- and integrated-type ASHP water heaters. The category of the different types of ASHP water heaters was limited to one because of the cost implication. Practical implications The experiments were not conducted with various hot water storage tanks installed in different positions (roof, inside or outside of a building wall, etc.) so that actual real-life observations could be obtained. The challenges of easy disassembling and deployment of systems and DAS to different positions were also a real concern. Social implications The findings can help homeowners and ESCO in deciding whether to install isotherm blankets on storage tanks of ASHP water heaters on the basis of the impact of standby losses and its potential viability. Originality/value The experimental design and methodology are the first of its kind to be conducted in South Africa. The results and interpretation were obtained from original data collected from a set of experiments conducted. The findings also show that the installation of isotherm blanket on an electric geyser can result in a significant mean reduction in the standby losses. In contrast, an installation of the isotherm blankets on the storage tanks of ASHP water heaters can reduce the standby losses, but there exists no significant mean difference.

Thanaraj, D P, N., A and Arulraj, P (2019) Experimental investigation of mechanical properties and physical characteristics of concrete under standard fire exposure. Journal of Engineering, Design and Technology , 17(05), 878–903.

Wang, L (2020) Home intelligent lighting control system based on wireless sensor. Journal of Engineering, Design and Technology , 18(05), 1231–40.

Woju, U W and Balu, A (2020) Fuzzy uncertainty and its applications in reinforced concrete structures. Journal of Engineering, Design and Technology , 18(05), 1175–91.

Woju, U W and Balu, A (2020) Time-dependent safety performance of reinforced concrete structures. Journal of Engineering, Design and Technology , 18(05), 1103–20.

Xia, Y (2020) Research on dynamic data monitoring of steel structure building information using BIM. Journal of Engineering, Design and Technology , 18(05), 1165–73.

Yan, J (2020) 3D printing optimization algorithm based on back-propagation neural network. Journal of Engineering, Design and Technology , 18(05), 1223–30.

Yang, W, Misheng, L, Lijun, S, Hao, T and Hongwei, M (2017) Compact design strategies of cultural centres in South China. Journal of Engineering, Design and Technology, 15(05), 635-51.

Yap, J B H, Low, P L and Wang, C (2017) Rework in Malaysian building construction: impacts, causes and potential solutions. Journal of Engineering, Design and Technology, 15(05), 591-618.

Zadok, Y (2019) Project-based learning in robotics meets junior high school. Journal of Engineering, Design and Technology , 18(05), 941–58.

Zhang, X, Wang, M, Zhou, B and Wang, X (2018) Influence of factors on collapse risk of loess tunnel: a multi-index assessment model. Journal of Engineering, Design and Technology, 16(05), 734–49.