scholarly journals Energy consumption analysis of a ground water-source heat pump for the plant factory based on TRNSYS simulation

2021 ◽  
Vol 267 ◽  
pp. 01047
Author(s):  
Gukun Yang ◽  
Huixian Shi ◽  
DeTian Xu ◽  
Zheng Shen ◽  
Zhonghua Zhang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Simulation Model ◽  
Ground Water ◽  
Heat Pump ◽  
Water Source ◽  
High Energy ◽  
Pump System ◽  
Heat Pump System ◽  
Operation Conditions ◽  
Plant Factory

The ground water-source heat pump system for the plant factory lacks a scientific operation strategy to solve the problem of high energy consumption in winter and summer. It is very difficult and uneconomical to change the operation conditions by experimental means to obtain actual operation data. The current study aims to build a TRNSYS simulation model of the ground water-source heat pump system of Shanghai Chongming Natural Light Plant Factory. For the heating season, the simulation of energy consumption was 2315 GJ. Compared with the actual energy consumption, the relative error is -0.98%, which indicates that the simulation results are accurate and the simulation model developed is appropriate and usable. Numerical simulations for the whole year on this basis yielded that the plant factory energy supply system operates from November to March with a heating energy consumption of 3530.84 GJ and from June to September with a cooling energy consumption of 1126.24 GJ. In most cases, the indoor temperature fluctuates within a reasonable range, but in the summer high-temperature season, the plant factory temperature will reach above 40℃, which seriously affects plant growth. After optimization, the plant factory stops production in July and August, and the system stops running, the results are that the optimized system can save 56% of the annual cooling energy consumption, totalling 767.48 GJ, which can reduce the costs by 160,318.05 RMB.

Performance evaluation of ground water-source heat pump system with a fresh air pre-conditioner using ground water

2019 ◽  
Vol 188 ◽  
pp. 250-261 ◽  
Author(s):  
Zhanwei Wang ◽  
Lin Wang ◽  
Aihua Ma ◽  
Kunfeng Liang ◽  
Zun Song ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Ground Water ◽  
Heat Pump ◽  
Water Source ◽  
Pump System ◽  
Heat Pump System

scholarly journals Analysis and Research on Energy-Saving Reconstruction of Building Heating System

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Yongqiang Liu ◽  
Zhanfang Huang
Keyword(s):  
Heat Source ◽  
Heat Pump ◽  
Original System ◽  
Water Source ◽  
Heating System ◽  
High Energy ◽  
Pipe Network ◽  
Pump System ◽  
Heat Pump System ◽  
Central Heating

A building heating system had high energy consumption and did not meet the requirements of environmental protection, so it was needed to be reformed. After recalculating the heat load, it was found that the heat source, pipe network specification, and radiator area of the original heating system were oversized. After comparing with a gas-fired boiler, the heat source was transformed into the water source heat pump system. The water supply temperature of the water source heat pump was lower than that of the boiler. Generally, it seemed necessary to increase the radiator area. However, after calculation and verification, when the supply and return water temperature was 65/58°C, the system operated continuously and the original pipe network and radiator could still ensure the indoor temperature of 16°C. The total cost of transformation was 11.5 million Chinese Yuan. After analyzing the operation data of the new system, the water source heat pump system could save 82.6% energy compared with the original system and 29.6% cost compared with the central heating system. The transformation is successful, and the experience is worth popularizing.

scholarly journals Based on the water source heat pump system operation control and energy consumption optimization

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
Guangxiang Wang ◽  
Wei Ding
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water Source ◽  
System Operation ◽  
Pump System ◽  
The Sustainable Development ◽  
Heat Pump System ◽  
Energy Consumption Optimization ◽  
New Energy ◽  
Operation Control

The contradiction between the increasing material demand and resource, is the country has faced problems, to better solve the material demand and the contradiction between the environment and resources, is applied to the development of new energy, new energy, not only can alleviate people and resources, environment and resources, the contradiction between people and the environment, also can promote the sustainable development of world economy, HVAC technology has emerged a new generation of energy-saving technology, HVAC has the characteristics of low consumption, low pollution, is a development of technology, to be promoted for environment-friendly, resource-conserving society has an important role in promoting. This paper focuses on the HVAC technology, water source heat pump system operation control and energy consumption optimization, for the relevant personnel reference.

Experimental Study and Application Analysis on Ground-Water Source Heat Pump In North China

Solar Energy ◽  
2006 ◽  
Author(s):  
Zhun Yu ◽  
Youyin Jing ◽  
Yingbai Xie ◽  
Xutao Zhang
Keyword(s):  
Ground Water ◽  
Water Temperature ◽  
Heat Pump ◽  
Heat Load ◽  
North China ◽  
Water Source ◽  
Coefficient Of Performance ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Water

To describe the economical performance and operational characteristic of ground-water source heat pump system (GWSHPS) in North China, GWSHPS was compared with traditional central air-conditioning system (TCACS) for their total investments based upon a GWSHPS demonstration project in Beijing (88000 m2 covered area, 4572 kW heat exchange amount). At the same period, an experimental system of GWSHPS in Hebei was investigated with its operational data such as coefficient of performance (COP). The results of the demonstration project showed that the total investment for GWSHPS was 15.2% lower than TCACS, while annual operating cost for GWSHPS was 42.2% lower than TCACS. The test data of the system in Hebei showed that heating coefficient of performance of the heat pump and primary energy ratio (PER) were raised while heating water temperature was decreased. The entering water temperature to the unit ranged from 13.1°C to 17.4°C, with an average value of 15 °C, the heating water temperature varied from 40°C to 50°C, with the standard work condition of 45°C. The COPHP was about 4.12 at the minimum of heating water temperature, while it was about 3.47 at the maximum of heating water temperature and fluctuated between these values in other temperature. The results of the present work implies that GWSHPS is favorable for North China. However, buildings in North China have high heat load in winter, consequently, GWSHPS designed upon heat load will cause a waste in summer, thus, the solar-assisted ground-water source heat pump system (SAGWSHPS) which combines heat pump with solar water heater can be suggested as the best solution in North China.

DETERMINING THE PROFITABILITY OF GREENHOUSE ELECTROTECHNOLOGIES: A MODELING APPROACH

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 249a-249
Author(s):  
Eric A. Lavoie ◽  
Damien de Halleux ◽  
André Gosselin ◽  
Jean-Claude Dufour
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water System ◽  
Heat Pumps ◽  
Hot Water ◽  
Pump System ◽  
Heat Pump System ◽  
Artificial Lighting ◽  
Hot Air ◽  
Marketable Fruit

The main objective of this research was to produce a simulated model that permitted the evaluation of operating costs of commercial greenhouse tomato growers with respect to heating methods (hot air, hot water, radiant and heat pumps) and the use of artificial lighting for 1991 and 1992. This research showed that the main factors that negatively influence profitability were energy consumption during cold periods and the price of tomatoes during the summer season. The conventional hot water system consumed less energy than the heat pump system and produced marketable fruit yields similar to those from the heat pump system. The hot water system was generally more profitable in regards to energy consumption and productivity. Moreover, investment costs were less; therefore, this system gives best overall financial savings. As for radiant and hot air systems, their overall financial status falls between that of the hot water system and the heat pump. The radiant system proved to be more energy efficient that the hot air system, but the latter produced a higher marketable fruit yield over the 2-year study.

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