Category Archives: Heat Recovery Solutions

Heat Recovery Potential in Kuopio Region

Heat Recovery Potential in Kuopio Region

2014 – 2015

Kuopio Energy supplies electricity and district heating as well as associated services to Kuopio and surrounding areas. Kuopio Energy’s electricity production is based on peat which comes from the peatlands of eastern Finland. In Kuopio, District heating covers more than 90% of the city’s heating energy requirement.

The main target of the project was to quantify the potential for heat recovery from alternative heat sources into Kuopio city wide District Heating network with the aid of heat pump solutions. The alternative heat sources considered in this study included municipal treated sewage water, and excess heat from potential district cooling customers and large retail buildings.

The project was divided into three separate sub-projects according to heat source:

Feasibility of sewage water heat pump station:

    • Dimensioning for optimal capacity for heat pump station
    • Heat production simulation (heat recovery potential from treated sewage water and surplus production from lake water)
    • Investment and O&M cost estimates for plant life-cycle
    • Alternative avoided heat production cost estimates
    • Cash flow analysis for several heat pump solution scenarios

Feasibility of district cooling:

    • Cooling demand in Kuopio area
    • Network scenarios and preliminary design for networks
    • Production Capacity optimization included the following technologies

      o Heat pumps and heat recovery potential into district heating network (combined heating and cooling, CHC)
      o Other technologies considered included compressor and absorption chillers, and free cooling from the nearby lake
      o Accumulator optimization

    • Cooling production simulation
    • Preliminary district cooling plant design
    • Investment and O&M cost estimates
    • Cash flow analysis for several district cooling scenarios with alternative production and network options

Feasibility of recovery of excess heat from large retail buildings:

    • Quantifying the total potential of excess heat from large retail buildings
    • Preliminary design for the heat recovery system including

      o Heat pump capacity optimization
      o Connecting to and replacing of customers’ existing air conditioning units with heat pump units
      o Connection to the district heating network

    • Preliminary layout drawings for the heat recovery system
    • Investment and O&M cost estimates for plant life-cycle
    • Cash flow analysis for heat recovery system
    • Appraisal of possibility for two-way heat sales business

The overall heat recovery potential from alternative heat sources in Kuopio region, and the other results from the three sub-projects were summarized in the final report.

Client: Kuopio Energy Ltd.

Heat Recovery from Sewage (Finland)

Heat Recovery from Sewage (Finland)

Heat Recovery from Sewage

2012

The study was a part of the overall RESCA-project (Renewable Energy Solutions in City Areas) in which HSY and several Finnish cities cooperate aiming to increase the utilization of renewable energy by creating common operating models and disseminating best practices.

Sewage water has high heat energy potential which can be harnessed by using the heat pump technology. The project included reviewing waste water heat recovery technologies (large-scale heat pump units, sewage heat exchangers etc.), outlining the business model for utilizing sewage waste heat, as well as the financial analysis for different heat recovery system alternatives.

The project was related to the “light district heating” project (reduced supply temperature) analyzed for the connection of the Marja-Vantaa area. Lower DH temperature levels would improve the aptitude of sewage heat pumps for heat production.

The project results were used in the decision making regarding the sewage heat recovery pilot project considered at Marja-Vantaa area.


Client: Helsinki Region Environmental Services Authority (HSY)

Helsinki Region Environmental Services Authority (HSY) is a regional authority providing environmental services for residents and companies in the Helsinki area. Their principal duties comprise water and waste management as well as regional information services.

Heat Recovery and Cooling System for Data Center

Heat Recovery and Cooling System for Data Center

data_center_cooling

Confidential

2012

Greenfield Consulting carried out a techno-economic analysis and preliminary technical design for the cooling system for a Data Center.


Client: Helsingin Energia

As one of the largest energy companies in Finland, Helsingin Energia supplies electric energy to about 400,000 customers in Finland and covers more than 90 percent of the heat demand of the capital city with district heat. Helsingin Energia produces and sells district cooling, which is considerably expanding in Helsinki (Customers’ connection power was 120 MW in 2011). The District cooling network of Helsingin Energia is the third largest and fastest growing in Europe.

Feasibility Study and Pre-engineering of Cooling and Heat Recovery System (Heat pump station)

Feasibility Study and Pre-engineering of Cooling and Heat Recovery System (Heat pump station)

Heat Pump Unit 2Feasibility study and pre-engineering; 2013

The project work included the Feasibility Study and Pre-engineering for a cooling and heat recovery system with 3,3 MWCooling of cooling capacity and 4,7 MWHeating) of heat recovery. The work included the following::

  • Heat pump capacity optimization
  • Connection to the district heating network and to the cooling customer
  • Modeling of the heating and cooling production
  • Preliminary flow diagrams and layout drawings
  • Electrification, automation and HVAC
  • Investment and O&M cost estimates
  • Least cost analysis
  • Preliminary cooling tariffs

The project was managed by Helsinki Energy and will be carried out by Greenfield Consulting in close cooperation with Helsinki Energy specialists on each engineering area.


Client: Elenia Heat Ltd

Elenia heating company produces district heating and electricity and sells and distributes district heating and natural gas in Häme, Central Finland, Northern Ostrobothnia and Heinola. The company operates in approximately 10 municipalities in total. Natural gas is used as a fuel in the company’s operations and distributed to customers in six population centers. Electricity is produced for the national transmission grid at the Vanaja power plant in Hämeenlinna.

Elenia heating business has currently nearly 5 000 customer contracts and some 85 000 end users. There are approximately 200 district heating companies in Finland, the majority being owned by municipalities. Elenia heating company is Finland’s second-largest private supplier of district heating.

Helsinki City Centre Underground District Cooling Station

Helsinki City Centre Underground District Cooling Station

Implementation phase; 2012– (in progress)

Helsinki Underground District Cooling Station Construction

Helen Ltd. is currently constructing a district cooling station under the city centre of Helsinki.

The implementation phase of the project includes the following sub-projects:

  • Excavation
  • Construction works
  • Process and machinery
  • HVAC
  • Electrification
  • Automation

Performance data of the station (after first construction phase):

  • Cooling capacity (accumulator only): 40 MW
  • Water volume: 35 000 m³
  • Energy capacity: 230 MWh

The installation of heat pump units (2 × 15 MW) depends on the DC customers’ connected capacity forecast; new installations are required when the connected DC load exceeds the production capacity.

Greenfield Consulting contribution to the project

Jussi-Pekka Kuivala M.Sc. (tech.) is assigned to support the project head engineer of Helen Ltd. The tasks include extensive studies and planning works as well as participating in the procurements and procurement control having reference to process and machinery sub-projects.

Pre-engineering of an Underground District Cooling Station, City Centre, Helsinki, Finland; 2011 – 2012

Helsinki Underground District Cooling Station Rendering

Helen Ltd. was planning to construct an underground district cooling station in the city centre of Helsinki. The cooling station would involve a rock cavern accumulator and a reservation for heat pump units for complementary cooling capacity.

Pre-engineering work included process and mechanical engineering, electrical, automation, HVAC and building engineering sub-projects.

Greenfield Consulting contribution to the project

Greenfield Consulting was assigned to support the project head engineer of Helen Ltd. The tasks involved the cooling station process engineering, including the selection of optimal production capacity as well as the designing of both technically and economically optimal process flow diagram. The layout design was carried out based on the process and machinery engineering.


Client: Helen Ltd.

Helen Ltd. is one of the largest energy companies in Finland supplying electric energy to about 400,000 customers and covering more than 90 percent of the heat demand of the capital city with district heat. Helen Ltd. also produces and sells district cooling, which is considerably expanding in Helsinki.

Among the services provided by Helen Ltd. are the design, projecting and maintenance of energy production and distribution systems.